Title of Invention	A CLCLONE SEPARATOR AND A PROCESS TO SEPARATE CATALYST PARTICLES FROM A GASEOUS PRODUCT LEAYING A FLUID CATALYST CRACKING RISER REACTOR IN A CYCLONE SEPARATOR
Abstract	A cyclone separator and a process to separate catalyst particles from a gaseous product leaving a fluid catalyst cracking riser reactor in a cyclone separator The present invention relates to a cyclone separator comprising a vertical housing open at its lower end and provided with a cover at its upper end having a central opening an inlet duct for tangential entry of a mixture of gas and catalyst particles from the outlet of a riser reactor of a fluid-bed catalytic cracking plant, a particles discharge duct communicating with the open lower end of the vertical housing, and a gas outlet duct having a vertical section which extends through the central opening in the cover, which cyclone separator further comprises an open-ended pipe arranged in the central opening so as to define an annular gas inlet conduit between the outer surface of at least part of the vertical section of the gas outlet duct and the inner surface of the open-ended pipe, the cyclone separator being characterized in that it comprises swirl imparting means arranged in the annular gas inlet conduit. The present invention also relates to a process to separate catalyst particles from a gaseous product.

Title of Invention

A CLCLONE SEPARATOR AND A PROCESS TO SEPARATE CATALYST PARTICLES FROM A GASEOUS PRODUCT LEAYING A FLUID CATALYST CRACKING RISER REACTOR IN A CYCLONE SEPARATOR

Abstract

A cyclone separator and a process to separate catalyst particles from a gaseous product leaving a fluid catalyst cracking riser reactor in a cyclone separator The present invention relates to a cyclone separator comprising a vertical housing open at its lower end and provided with a cover at its upper end having a central opening an inlet duct for tangential entry of a mixture of gas and catalyst particles from the outlet of a riser reactor of a fluid-bed catalytic cracking plant, a particles discharge duct communicating with the open lower end of the vertical housing, and a gas outlet duct having a vertical section which extends through the central opening in the cover, which cyclone separator further comprises an open-ended pipe arranged in the central opening so as to define an annular gas inlet conduit between the outer surface of at least part of the vertical section of the gas outlet duct and the inner surface of the open-ended pipe, the cyclone separator being characterized in that it comprises swirl imparting means arranged in the annular gas inlet conduit. The present invention also relates to a process to separate catalyst particles from a gaseous product.

Full Text	The present invention relates to a cyclone separator and to a process to separate catalyst particles from a gaseous product leaving a fluid catalyst cracking riser reactor in a cyclone separator. The cyclone separator is applied as a separation stage in a reactor vessel of a reactor riser containing fluid-bed catalytic cracking plant A fluid-bed catalytic cracking plant includes a reactor vessel, a vertical reactor riser having an upper outlet which is in fluid communication with a separator system arranged in the reactor vessel, and a regenerator vessel. During normal operation, regenerated catalyst particles and hydrocarbonaceous feed are supplied to the inlet end of the reactor riser in which catalytic cracking of the feed takes place to form a mixture of gaseous product and catalyst particles. The mixture leaves the reactor riser at a high temperature of between 500 and 540°C or higher. The mixture of gaseous product and catalyst particles is passed into the separator system where gaseous product is separated from catalyst particles. The gaseous product is removed from the upper end of the reactor vessel, and the catalyst particles are discharged to the lower part of the reactor vessel where they are stripped. Stripped catalyst particles are passed to the regenerator vessel where coke deposited on the particles during cracking is bum-off at a high temperature to obtain combustion products and regenerated catalyst. The combustion products are removed from the upper end of the regenerator vessel and regenerated catalyst is re-used. Such a fluid-bed catalytic cracking plant is described in European patent apphcations publication No. 488 549. The known separator system comprises a cyclone separator and an luxury cyclone separator to ■■ provide a two-stage separation. The cyclone separator comprises a vertical housing open at its lower end provided with a cover at its upper end having a central opening, an inlet duct for tangential entry of a mixture of gas and catalyst particles from the outlet of the riser reactor, a particles outlet duct communicating with the open lower end of the vertical housing, and a gas outlet duct having a vertical section which extends through the central opening in the cover and which has an outer diameter which is smaller than the diameter of the central opening. The central opening and the outer surface of the gas outlet duct define an annular inlet port. The cyclone separator is arranged in the upper part of the reactor vessel, so that during normal operation stripping gas present in the reactor vessel can be drawn into the cyclone separator through the annular inlet port by the difference in pressure between the interior of the reactor vessel and the interior of the cyclone separator. It is an object of the present invention to improve the efficiency of the known cyclone separator in particular at the level in the cyclone separator where the separation efficiency is low. To this end the cyclone separator according to the present invention comprises a vertical housing open at its lower end provided with a cover at its upper end having a central opening, an inlet duct for tangential entry of a mixture of gas and catalyst particles from the outlet of a riser reactor of a fluid-bed catalytic cracking plant, a particles discharge duct communicating with the open lower end of the vertical housing, and a gas outlet duct having a vertical section which extends through the central opening in the cover, which cyclone separator further comprises an open-ended pipe arranged in the central opening so as to define an annular gas inlet conduit between the outer surface of at least part of the vertical section of the gas outlet duct and the inner surface of the open-ended pipe, and swirl imparting means arranged in the annular gas inlet conduit. Accordingly, the present invention provides a cyclone separator comprising a vertical housing open at its lower end and provided with a cover at its upper end having a central opening, an inlet duct for tangential entry of a mixture of gas and catalyst particles from the outlet of a riser reactor of a fluid-bed catalytic cracking plant, a particles discharge duct communicating with the open lower end of the vertical housing, and a gas outlet duct having a vertical section which extends through the central opening in the cover, which cyclone separator further comprises an open-ended pipe arranged in the central opening so as to define an annular gas inlet conduit between the outer surface of at least part of the vertical section of the gas outlet duct and the inner surface of the open-ended pipe, the cyclone separator being characterized in that it comprises swirl imparting means arranged in the annular gas inlet conduit. Accordingly, the present invention also provides a process to separate catalyst particles from a gaseous product leaving a fluid catalyst cracking riser reactor in a cyclone separator as described above, wherein the cyclone separator is arranged in the upper part of a reactor vessel and the gaseous product is fed to the cyclone via the inlet duct for tangential entry of the gaseous product resulting in that a gaseous product is removed from the cyclone through the gas outlet duct and catalyst particles are removed from the cyclone through the particles discharge duct after which discharged catalyst particles are collected in the lower part of the reactor vessel where product adhered to the particles is stripped off by means of stripping gas supplied to the lower part of the reactor vessel, resulting in a gaseous mixture of striping vapour, stripped product and catalyst particles passing upwards towards the dilute phase zone in the upper part of the reactor vessel, wherein the gaseous mixture is drawn into the cyclone through the annular gas inlet conduit. The invention will now be described by way of example in more detail with reference to the accompanying drawing showing schematically a partial longitudinal section of the cyclone separator of the present invention. The cyclone separator 1 of the present invention comprises a vertical housing 2 which has a discharge opening 3 at its lower end 4 and which is provided with a cover 5 at its upper end 6. The cover 5 has a central opening 8. The cyclone separator 1 further comprises an inlet duct 10 extending between the upper outlet opening 12 of a riser reactor 15 and the inlet opening 14 of the cyclone separator 1 for tangential entry of a mixture of gas and catalyst particles into the cyclone separator 1. It also comprises a particles discharge duct 16 communicating with the discharge opening 3 in lower end 4 of the vertical housing 2, and a gas outlet duct 18. The gas outlet duct 18 has a vertical straight section 20 which extends through the central opening 8 in the cover 5. The cyclone separator further comprises an open-ended pipe 23 fixed in the central opening 8, wherein an annular gas inlet conduit 25 is defined between the outer surface of the lower part of the vertical section 20 of the gas outlet duct 18 and the inner surface of the open-ended pipe 23. In the annular gas inlet conduit 25 swirl imparting means in the form of swirl vanes 30 are arranged. The cyclone separator 1 of the present invention is arranged in the upper part 23 of a reactor vessel. Since such a reactor vessel is well known, it will not be discussed in detail and only its roof 35 is shown. As a fluid-bed catalytic cracking plant is well known, other parts of such a plant are not shown. During normal operation a mixture of gaseous product and catalyst particles leaves the reactor riser 15 through opening 12. The mixture is drawn into the inlet duct 10 which opens into the housing 2 so that the mixture enters tangentially into the upper end 6 of the housing 2 of the cyclone separator 1. As a result there is a swi^rling mixture within the housing 2, and gaseous product is removed from the housing 2 through gas outlet duct 18. Catalyst particles fall to the lower end 4 of the housing 2, and they are discharged via the particles discharge duct 16. The discharged catalyst particles are collected in the lower part (not shown) of the reactor vessel where product adhered to the particles is stripped off by means of stripping gas supplied to the lower part of the reactor vessel. As a result a gaseous mixture of stripping vapour and stripped product passes upwards towards the dilute phase zone in the upper part of the reactor vessel under the roof 35. This gaseous mixture also contains small amounts of entrained catalyst particles, and these catalyst particles have to be removed from the gaseous mixture. To this end gaseous mixture is drawn into the upper end 6 of housing 2 through the annular gas inlet conduit 25. The swirl imparting means in the form of swirl vanes '30 will impart a swirling motion on the gaseous mixture, and in this way initial separation of entrained catalyst particles is effected, which separation continues as the mixture descends in housing 2. Suitably the swirl imparting means 30 are so i arranged that the direction of rotation which they J impart is the same as the direction of rotation of the mixture of gaseous product and catalyst particles from the reactor riser 15, so that the latter swirl is amplified which further improves the overall efficiency of the cyclone separator 1. The ratio of the outer diameter of the vertical section 20 to the diameter of the central opening 8 is suitably in the range of from 0.3 to 0.7. The lower end 37 of the gas outlet duct 18 is located below the lower edge 39 of the inlet opening 14. ' However, the open-ended conduit 23 does not extend thait far into the cyclone separator 1; it only extends to part of the height of the inlet opening 14. The distance between the lower end 4 0 of the open-ende'd conduit 23 and the upper edge 41 of the inlet opening 14 is between 10% and 60% of the height of the inlet opening 14. This is done to maximize the effect which the rotation imparted by the swirl imparting means 30 has on the fluid leaving opening 14. To accommodate differences in thermal expansion between the housing 2 and the gas outlet duct 18, the swirl imparting means 30 are either fixed to the inner surface of the open-ended pipe 23 or to the outer surface of the vertical section 20 of the gas outlet duct 18, but not fixed to both surfaces. The number of swirl vanes 30 is suitably between 2 \ ^' and 8, very suitably between 3 and 6. The gas outlet duct 18 can be connected directly to a plenum chamber (not shown) which is provided with a gas outlet (not shown) extending through the roof 35, in which case the separator system includes one separation stage only. In an alternative embodiment the gas outlet duct 18 can be connected to an auxiliary cyclone separator (not shown), of which the gas outlet which opens into the plenum chamber, in which case the separator system includes two separation stages. The upper end of the reactor riser 15 can be arranged in the reactor vessel (as shown in the Figure), or it can be located outside the reactor vessel, so that the inlet duct has to extend through the side wall of the reactor vessel. WE CLAIM; 1. A cyclone separator (1) comprising a vertical housing (2) open at its lower end (4) and provided with a cover (5) at its upper end (6) having a central opening (8) an inlet duct (10) for tangential entry of a mixture of gas and catalyst particles from the outlet of a riser reactor of a fluid-bed catalytic cracking plant, a particles discharge duct (16) communicating with the open lower end of the vertical housing, and a gas outlet duct (18) having a vertical section which extends through the central opening (8) in the cover (5), which cyclone separator (1) further comprises an open-ended pipe (23) arranged in the central opening (8) so as to define an annular gas inlet conduit (25) between the outer surface of at least part of the vertical section of the gas outlet duct and the inner surface of the open-ended pipe, the cyclone separator being characterized in that it comprises swirl imparting means (30) arranged in the annular gas inlet conduit (25). 2. The cyclone separator as claimed in claim 1, wherein the ratio of the outer diameter of the vertical section of the gas outlet duct to the diameter of the central opening in the cover is in the range of from 0.3 to 0.7. 3. The cyclone separator as claimed in any one of claims 1 to 2, wherein the lower end of the gas outlet duct is located below the lower edge of the inlet duct for tangential entry of a mixture of gas and catalyst particles. 4. The cyclone separator as claimed in any one of claims 1 to 3, wherein the open-ended pipe extends to part of the height of the inlet duct for tangential entry of a mixture of gas and catalyst particles. 5. The cyclone separator as claimed in claim 4, wherein the distance between the lower end of the open-ended pipe and the upper edge of the inlet duct for tangential entry of a mixture of gas and catalyst particles is between 10% and 60% of the height of said inlet duct. 6. The cyclone separator as claimed in any one of claims 1 to 5, wherein the swirl imparting means are either fixed to the inner surface of the open-ended pipe or to the outer surface of the vertical section of the gas outlet duct, but not fixed to both surfaces. 7. The cyclone separator as claimed in any one of claims 1 to 6, wherein the swirl imparting means are between 2 and 8 swirl vanes. 8. A process to separate catalyst particles from a gaseous product leaving a fluid catalyst cracking riser reactor in a cyclone separator (1) as claimed in any one of claims 1 to 7, wherein the cyclone separator (1) is arranged in the upper part of a reactor vessel and the gaseous product is fed to the cyclone via the inlet duct (10) for tangential entry of the gaseous product resulting in that a gaseous product is removed from the cyclone through the gas outlet duct (18) and catalyst particles are removed from the cyclone through the particles discharge duct (16) after which discharged catalyst particles are collected in the lower part of the reactor vessel where product adhered to the particles is stripped off by means of stripping gas supplied to the lower part of the reactor vessel, resulting in a gaseous mixture of striping vapour, stripped product and catalyst particles passing upwards towards the dilute phase zone in the upper part of the reactor vessel, wherein the gaseous mixture is drawn into the cyclone through the annular gas inlet conduit (25). 9. A cyclone separator substantially as herein described with reference to the accompanying drawings. 10. A process to separate catalyst particles from a gaseous product leaving a fluid catalyst cracking riser reactor in a cyclone separator substantially as herein described with reference to the accompanying drawings.

Full Text

The present invention relates to a cyclone separator and to a process to separate catalyst particles from a gaseous product leaving a fluid catalyst cracking riser reactor in a cyclone separator. The cyclone separator is applied as a separation stage in a reactor vessel of a reactor riser containing fluid-bed catalytic cracking plant
A fluid-bed catalytic cracking plant includes a reactor vessel, a vertical reactor riser having an upper outlet which is in fluid communication with a separator system arranged in the reactor vessel, and a regenerator vessel. During normal operation, regenerated catalyst particles and hydrocarbonaceous feed are supplied to the inlet end of the reactor riser in which catalytic cracking of the feed takes place to form a mixture of gaseous product and catalyst particles. The mixture leaves the reactor riser at a high temperature of between 500 and 540°C or higher. The mixture of gaseous product and catalyst particles is passed into the separator system where gaseous product is separated from catalyst particles. The gaseous product is removed from the upper end of the reactor vessel, and the catalyst particles are discharged to the lower part of the reactor vessel where they are stripped. Stripped catalyst particles are passed to the regenerator vessel where coke deposited on the particles during cracking is bum-off at a high temperature to obtain combustion products and regenerated catalyst. The combustion products are removed from the upper end of the regenerator vessel and regenerated catalyst is re-used.
Such a fluid-bed catalytic cracking plant is described in European patent
apphcations publication No. 488 549. The known separator system comprises a
cyclone separator and an luxury cyclone separator to ■■

provide a two-stage separation. The cyclone separator comprises a vertical housing open at its lower end provided with a cover at its upper end having a central opening, an inlet duct for tangential entry of a mixture of gas and catalyst particles from the outlet of the riser reactor, a particles outlet duct communicating with the open lower end of the vertical housing, and a gas outlet duct having a vertical section which extends through the central opening in the cover and which has an outer diameter which is smaller than the diameter of the central opening. The central opening and the outer surface of the gas outlet duct define an annular inlet port.
The cyclone separator is arranged in the upper part of the reactor vessel, so that during normal operation stripping gas present in the reactor vessel can be drawn into the cyclone separator through the annular inlet port by the difference in pressure between the interior of the reactor vessel and the interior of the cyclone separator.
It is an object of the present invention to improve the efficiency of the known cyclone separator in particular at the level in the cyclone separator where the separation efficiency is low.
To this end the cyclone separator according to the present invention comprises a vertical housing open at its lower end provided with a cover at its upper end having a central opening, an inlet duct for tangential entry of a mixture of gas and catalyst particles from the outlet of a riser reactor of a fluid-bed catalytic cracking plant, a particles discharge duct communicating with the open lower end of the vertical housing, and a gas outlet duct having a vertical section which extends through the central opening in the cover, which cyclone separator further comprises an open-ended pipe arranged

in the central opening so as to define an annular gas inlet conduit between the outer surface of at least part of the vertical section of the gas outlet duct and the inner surface of the open-ended pipe, and swirl imparting means arranged in the annular gas inlet conduit.
Accordingly, the present invention provides a cyclone separator comprising a vertical housing open at its lower end and provided with a cover at its upper end having a central opening, an inlet duct for tangential entry of a mixture of gas and catalyst particles from the outlet of a riser reactor of a fluid-bed catalytic cracking plant, a particles discharge duct communicating with the open lower end of the vertical housing, and a gas outlet duct having a vertical section which extends through the central opening in the cover, which cyclone separator further comprises an open-ended pipe arranged in the central opening so as to define an annular gas inlet conduit between the outer surface of at least part of the vertical section of the gas outlet duct and the inner surface of the open-ended pipe, the cyclone separator being characterized in that it comprises swirl imparting means arranged in the annular gas inlet conduit.
Accordingly, the present invention also provides a process to separate catalyst particles from a gaseous product leaving a fluid catalyst cracking riser reactor in a cyclone separator as described above, wherein the cyclone separator is arranged in the upper part of a reactor vessel and the gaseous product is fed to the cyclone via the inlet duct for tangential entry of the gaseous product resulting in that a gaseous product is removed from the cyclone through the gas outlet duct and catalyst particles are removed from the cyclone through the particles discharge duct after which discharged catalyst particles are collected in the lower part of the reactor vessel where

product adhered to the particles is stripped off by means of stripping gas supplied to the lower part of the reactor vessel, resulting in a gaseous mixture of striping vapour, stripped product and catalyst particles passing upwards towards the dilute phase zone in the upper part of the reactor vessel, wherein the gaseous mixture is drawn into the cyclone through the annular gas inlet conduit.
The invention will now be described by way of example in more detail with reference to the accompanying drawing showing schematically a partial longitudinal section of the cyclone separator of the present invention.
The cyclone separator 1 of the present invention comprises a vertical housing 2 which has a discharge opening 3 at its lower end 4 and which is provided with a cover 5 at its upper end 6. The cover 5 has a central opening 8.
The cyclone separator 1 further comprises an inlet duct 10 extending between the upper outlet opening 12 of a riser reactor 15 and the inlet opening 14 of the cyclone separator 1 for tangential entry of a mixture of gas and catalyst particles into the cyclone separator 1. It also comprises a particles discharge duct 16 communicating with the discharge opening 3 in lower end 4 of the vertical housing 2, and a gas outlet duct 18.
The gas outlet duct 18 has a vertical straight section 20 which extends through the central opening 8 in the cover 5.
The cyclone separator further comprises an open-ended pipe 23 fixed in the
central opening 8, wherein an annular gas inlet conduit 25 is defined between the
outer surface of the lower part of the vertical section 20 of the gas outlet duct 18 and
the inner surface of the open-ended pipe 23. In the annular gas

inlet conduit 25 swirl imparting means in the form of swirl vanes 30 are arranged.
The cyclone separator 1 of the present invention is arranged in the upper part 23 of a reactor vessel. Since such a reactor vessel is well known, it will not be discussed in detail and only its roof 35 is shown. As a fluid-bed catalytic cracking plant is well known, other parts of such a plant are not shown.
During normal operation a mixture of gaseous product and catalyst particles leaves the reactor riser 15 through opening 12. The mixture is drawn into the inlet duct 10 which opens into the housing 2 so that the mixture enters tangentially into the upper end 6 of the housing 2 of the cyclone separator 1. As a result there is a swi^rling mixture within the housing 2, and gaseous product is removed from the housing 2 through gas outlet duct 18. Catalyst particles fall to the lower end 4 of the housing 2, and they are discharged via the particles discharge duct 16. The discharged catalyst particles are collected in the lower part (not shown) of the reactor vessel where product adhered to the particles is stripped off by means of stripping gas supplied to the lower part of the reactor vessel. As a result a gaseous mixture of stripping vapour and stripped product passes upwards towards the dilute phase zone in the upper part of the reactor vessel under the roof 35.
This gaseous mixture also contains small amounts of entrained catalyst particles, and these catalyst particles have to be removed from the gaseous mixture. To this end gaseous mixture is drawn into the upper end 6 of housing 2 through the annular gas inlet conduit 25. The swirl imparting means in the form of swirl vanes '30 will impart a swirling motion on the gaseous mixture, and in this way initial separation of entrained catalyst

particles is effected, which separation continues as the mixture descends in housing 2.
Suitably the swirl imparting means 30 are so i
arranged that the direction of rotation which they J impart is the same as the direction of rotation of the mixture of gaseous product and catalyst particles from the reactor riser 15, so that the latter swirl is amplified which further improves the overall efficiency of the cyclone separator 1.
The ratio of the outer diameter of the vertical section 20 to the diameter of the central opening 8 is suitably in the range of from 0.3 to 0.7.
The lower end 37 of the gas outlet duct 18 is located below the lower edge 39 of the inlet opening 14. ' However, the open-ended conduit 23 does not extend thait far into the cyclone separator 1; it only extends to part of the height of the inlet opening 14. The distance between the lower end 4 0 of the open-ende'd conduit 23 and the upper edge 41 of the inlet opening 14 is between 10% and 60% of the height of the inlet opening 14. This is done to maximize the effect which the rotation imparted by the swirl imparting means 30 has on the fluid leaving opening 14.
To accommodate differences in thermal expansion between the housing 2 and the gas outlet duct 18, the swirl imparting means 30 are either fixed to the inner surface of the open-ended pipe 23 or to the outer surface of the vertical section 20 of the gas outlet duct 18, but not fixed to both surfaces.
The number of swirl vanes 30 is suitably between 2 \ ^' and 8, very suitably between 3 and 6.
The gas outlet duct 18 can be connected directly to a plenum chamber (not shown) which is provided with a gas outlet (not shown) extending through the roof 35, in which case the separator system includes one separation

stage only. In an alternative embodiment the gas outlet duct 18 can be connected to an auxiliary cyclone separator (not shown), of which the gas outlet which opens into the plenum chamber, in which case the separator system includes two separation stages. The upper end of the reactor riser 15 can be arranged in the reactor vessel (as shown in the Figure), or it can be located outside the reactor vessel, so that the inlet duct has to extend through the side wall of the reactor vessel.

WE CLAIM;
1. A cyclone separator (1) comprising a vertical housing (2) open at its lower end (4) and provided with a cover (5) at its upper end (6) having a central opening (8) an inlet duct (10) for tangential entry of a mixture of gas and catalyst particles from the outlet of a riser reactor of a fluid-bed catalytic cracking plant, a particles discharge duct (16) communicating with the open lower end of the vertical housing, and a gas outlet duct (18) having a vertical section which extends through the central opening (8) in the cover (5), which cyclone separator (1) further comprises an open-ended pipe (23) arranged in the central opening (8) so as to define an annular gas inlet conduit (25) between the outer surface of at least part of the vertical section of the gas outlet duct and the inner surface of the open-ended pipe, the cyclone separator being characterized in that it comprises swirl imparting means (30) arranged in the annular gas inlet conduit (25).
2. The cyclone separator as claimed in claim 1, wherein the ratio of the outer diameter of the vertical section of the gas outlet duct to the diameter of the central opening in the cover is in the range of from 0.3 to 0.7.
3. The cyclone separator as claimed in any one of claims 1 to 2, wherein the lower end of the gas outlet duct is located below the lower edge of the inlet duct for tangential entry of a mixture of gas and catalyst particles.
4. The cyclone separator as claimed in any one of claims 1 to 3, wherein the open-ended pipe extends to part of the height of the inlet duct for tangential entry of a mixture of gas and catalyst particles.

5. The cyclone separator as claimed in claim 4, wherein the distance between the lower end of the open-ended pipe and the upper edge of the inlet duct for tangential entry of a mixture of gas and catalyst particles is between 10% and 60% of the height of said inlet duct.
6. The cyclone separator as claimed in any one of claims 1 to 5, wherein the swirl imparting means are either fixed to the inner surface of the open-ended pipe or to the outer surface of the vertical section of the gas outlet duct, but not fixed to both surfaces.
7. The cyclone separator as claimed in any one of claims 1 to 6, wherein the swirl imparting means are between 2 and 8 swirl vanes.
8. A process to separate catalyst particles from a gaseous product leaving a fluid catalyst cracking riser reactor in a cyclone separator (1) as claimed in any one of claims 1 to 7, wherein the cyclone separator (1) is arranged in the upper part of a reactor vessel and the gaseous product is fed to the cyclone via the inlet duct (10) for tangential entry of the gaseous product resulting in that a gaseous product is removed from the cyclone through the gas outlet duct (18) and catalyst particles are removed from the cyclone through the particles discharge duct (16) after which discharged catalyst particles are collected in the lower part of the reactor vessel where product adhered to the particles is stripped off by means of stripping gas supplied to the lower part of the reactor vessel, resulting in a gaseous mixture of striping vapour, stripped product and catalyst particles passing upwards towards the dilute phase zone in the upper part of the reactor vessel, wherein the gaseous mixture is drawn into the cyclone through the annular gas inlet conduit (25).

9. A cyclone separator substantially as herein described with reference to the
accompanying drawings.
10. A process to separate catalyst particles from a gaseous product leaving a fluid
catalyst cracking riser reactor in a cyclone separator substantially as herein described
with reference to the accompanying drawings.

Documents:

1823-mas-1997 complete specification as granted.pdf

1823-mas-1997 abstract granted.pdf

1823-mas-1997 abstract.pdf

1823-mas-1997 claims granted.pdf

1823-mas-1997 correspondence others.pdf

1823-mas-1997 correspondence po.pdf

1823-mas-1997 description(complete) granted.pdf

1823-mas-1997 drawings.pdf

1823-mas-1997 drawins granted.pdf

1823-mas-1997 form-1.pdf

1823-mas-1997 form-19.pdf

1823-mas-1997 form-26.pdf

1823-mas-1997 form-4.pdf

1823-mas-1997 others.pdf

1823-mas-1997 petition.pdf

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Patent Number

200579

Indian Patent Application Number

1823/MAS/1997

PG Journal Number

30/2009

Publication Date

24-Jul-2009

Grant Date

01-Jun-2006

Date of Filing

19-Aug-1997

Name of Patentee

SHELL INTERNATIONALE RESEARCH MAATSCHAPPIJ B. V

Applicant Address

CAREL VAN BYLANDTLAAN 30, 2596 HR THE HAGUE,

Inventors:

#	Inventor's Name	Inventor's Address
1	HUBERTUS WILHELMUS ALBERTUS DRIES	BADHUISWEG 3, 1031 CM AMSTERDAM

PCT International Classification Number

B04C5/04

PCT International Application Number

N/A

PCT International Filing date

PCT Conventions:

#	PCT Application Number	Date of Convention	Priority Country
1			NA