Title of Invention

"METHOD FOR PRODUCING HIGH-VISCOSITY OR HIGHLY-STABLE POLYCONDENSATES AND DEMONOMERIZED POLYAMIDE 6"

Abstract A method of producing high-viscosity or highly stabilized polycondensates and demonomerised Polyamide 6 using vertical reaction stages, comprising :Feeding a polycondensate melt into the upper end of the reaction stage; distributing said polycondensate melt over an increased surface area; removing undesired polycondensate reaction products by means of inert gas or vacuum from the flowing polycondensate melt from the reaction stage above the level of the polycondensate melt; and selecting the product residence time in the sump such that at the lower end of the reaction stage there is a polycondensate which is in a condition of chemical equilibrium, and optionally selecting a part of said polycondensate into the upper end of the reaction stage.
Full Text A method of producing high-viscosity or highly stabilized polycondensates and demonomerised Polyamide 6 using vertical reaction stages, comprising :Feeding a polycondensate melt into the upper end of the reaction stage; distributing said polycondensate melt over an increased surface area; removing undesired polycondensate reaction products by means of inert gas or vacuum from the flowing polycondensate melt from the reaction stage above the level of the polycondensate melt; and selecting the product residence time in the sump such that at the lower end of the reaction stage there is a polycondensate which is in a condition of chemical equilibrium, and optionally selecting a part of said polycondensate into the upper end of the reaction stage.








We claim :
1. A method of producing high-viscosity or highly stabilized polycondensates and demonomerised Polyamide 6 using vertical reaction stages, comprising :
feeding a polycondensate melt into the upper end of the reaction stage; distributing said polycondensate melt over an increased surface area;
removing undesired polycondensate reaction products by means of inert gas or vacuum from the flowing polycondensate melt from the reaction stage above the level of the polycondensate melt; and
selecting the product residence time in the sump such that at the lower end of the reaction stage there is a polycondensate which is in a condition of chemical equilibrium, and optionally recycling a part of said polycondensate into the upper end of the reaction stage.
2. A method as claimed in claim 1, wherein the residence time for a polycondensation operation for increasing viscosity is up to 5 hours and the product residence time after fresh product flows together with product which has been fed back is up to 1 hour.
3. Apparatus for carrying out the method, comprising a vertical reactor (1) in which are arranged elements (3) which increase the surface area and above which is arranged a distributor (2) for feeding the polycondensate melt to the elements (3), wherein the upper end the reactor (1) has at least one gas outlet (4) and in the sump a level measuring device (5) and mounted to the lower end of the reactor (1) are two series-connected metering devices (P2,P3), between which is connected one end of a return conduit (6) whose other end is connected to the inlet of the distributor (2).
4. Apparatus as claimed in claim 3, wherein at least one of the metering devices is formed by a pump (P2, P3).
5. Apparatus as claimed in claim 3 or claim 4, wherein polycondensate melt is fed to the distributor (2) by way of a pump (PI) which is controllable for regulating the throughput through the reactor (1).
6. Apparatus a claimed in any of the claims 3 to 5, wherein the return conduit (6) opens into the inlet conduit (7) at a connecting location (9) downstream of the pump (PI) in the flow direction, and wherein a static mixer (10) and /or a reactor provided with an inlet and an outlet is arranged downstream of the connecting location (9) in the inlet conduit (7) upstream of the distributor (2).

Documents:

2277-delnp-2003-abstract.pdf

2277-delnp-2003-claims.pdf

2277-delnp-2003-correspondence-others.pdf

2277-delnp-2003-correspondence-po.pdf

2277-delnp-2003-description (complete).pdf

2277-delnp-2003-drawings.pdf

2277-delnp-2003-form-1.pdf

2277-delnp-2003-form-18.pdf

2277-delnp-2003-form-2.pdf

2277-delnp-2003-form-26.pdf

2277-delnp-2003-form-3.pdf

2277-delnp-2003-form-5.pdf

2277-delnp-2003-pa.pdf

2277-delnp-2003-pct-210.pdf

2277-delnp-2003-petition-137.pdf

2277-delnp-2003-petition-138.pdf


Patent Number 212056
Indian Patent Application Number 2277/DELNP/2003
PG Journal Number 04/2008
Publication Date 25-Jan-2008
Grant Date 14-Nov-2007
Date of Filing 26-Dec-2003
Name of Patentee POLYMER ENGINEERING GMBH
Applicant Address BREITSCHEIDSTRASSE 148, 07407 RUDOLSTADT-SCHWARZA, GERMANY.
Inventors:
# Inventor's Name Inventor's Address
1 WILTZER, KARLHEINZ LUDWIG-JAHN-STRASSE 3, 07422 BAD BLANKENBURG, GERMANY.
PCT International Classification Number C08G 69/18
PCT International Application Number PCT/EP02/05441
PCT International Filing date 2002-05-17
PCT Conventions:
# PCT Application Number Date of Convention Priority Country
1 101 26 133.0 2001-05-29 Germany