Title of Invention

"A CEMENT BLEND AND A PROCESS FOR PREPARING THE SAME THEREOF"

Abstract The present invention relates to cement blend comprising 1 to 50% by weight of spent zeolite catalyst, having improved fineness, setting time and compressing strength and a process for preparing the same. More, particularly, the present invention relates to a process for utilization of spent catalyst rich in silica and alumina as cement performance improver.
Full Text FIELD OF THE INVENTION
The present invention relates to a cement blend comprising 1 to 50% by weight of spent zeolite catalyst, having improved fineness, setting time and compressive strength and a process for preparing the same. More particularly, the present invention relates to a process for utilization of spent catalyst rich in silica and alumina as cement performance improver.
BACKGROUND OF THE INVENTION
Fluid Catalytic Cracking (FCC) is one of the largest secondary refining process in which over 500,000 MT of catalyst per year is consumed. In this process catalyst particles are in continuous motion from reactor to regenerator via cyclone and encounter collision with each other and hardware body. As a result of collision some-catalyst particles break into fines and are lost from the system which is know as attrition loss. In the process of cracking the catalyst gradually gets deactivated which is caused by the loss of crystallinity of zeolite. In the process of cracking the catalyst gradually gets permanent deactivation due to gradual deposition of metals such as vanadium and nickel. This demands periodic withdrawal of catalyst and substitution with fresh. The attrition loss is in the range of 0.5-3 wt% of inventors/day while withdrawal spent catalyst is almost 50% of total catalyst consumed per annum. Quantum of spent catalyst generated in the process of FCC world wide is mind boggling and is in the range 200,000-250,000 MT per annum. Environmental point of view disposal of spent catalyst is or great concern. Metals Trading International (MTl) finds a home for metal-bearing spent catalysts after they are no longer useful to the catalyst applicant. Metal bearing catalysts such as reforming, isomerization, hydrotreating, hydrocracking, catalysts contain high value metals such as nickel, cobalt, rhenium, palladium and platinum. MTI works with a number of industries using metal-bearing products as raw materials for the production of primary metals, steel, and chemicals. Recovery of these metals from spent catalysts is attractive on account of process cost. However, FCC catalysts do not contain such


precious metals in them and hence required to be looked in to only for their content of silica and alumina.
The disposal route of spent catalyst not containing heavy metals, or low in heavy metals, e.g. spent FCCU catalyst, depends very much on whether this type of waste is considered hazardous or not. In either case, land filling is a suitable option, but for hazardous waste the landfill should have proper containment control in place.
FCC catalysts are prepared from clay, zeolite and silica-alumina based binder and contain from 25-45 wt% of alumina and 40-50 wt% of silica. Spent FCC catalyst may additionally contain vanadium and nickel in the range 0.4-1 wt% and 0.1-0.5 wt% respectively. These catalysts have attracted the attention of industries such as ceramic and cement as a cheap raw material due to common composition.
One way to dispose of catalytic cracking catalyst particles is to use them as an ingredient in other compositions. This would avoid costly disposal practices and in addition give the particles a commercial value of their own. U.S,Pat. 5,5032,548 provides for utilizing particles of FCC catalyst together with a small amount of binder as a composition capable of functioning as a load-bearing layer in environments where it is subjected to compressive loads, such as in a road base or levee. Here particles are present in amount, by dry weight of the composition, in the range of 80% to 96%, and the binder is present in the range of 4% to 20%, by dry weight of the composition.
A preferred end use for catalytic cracking catalyst particles would be one in which large quantities of the particles are required, preferably as the main ingredient of a composition which itself is required to be used in large quantities. A composition useful in the construction industry, for example, would be desirable from the standpoint of the great quantities of particles which would be required.
Portland cement is one of the most widely used construction material with consumption at about 5.5 billion tons per year, second only to water in per capita demand. Hydraulic (chiefly portland) cement is the binding agent in concrete and mortar and thus a key component of a country's construction sector. Concrete is arguably the most abundant of

all manufactured solid materials. Portland cement is made primarily from finely ground clinker, which itself is composed dominantly of hydraulically active calcium silicate minerals formed through high-temperature burning of limestone and other materials in a kiln. This process requires approximately 1.7 tons of raw materials per ton of clinker produced and yields about 1 ton of carbon dioxide (CCh) emissions, of which calcination of limestone and the combustion of fuels each contribute about half. The overall level of CO2 output makes the cement industry one of the top two manufacturing industry sources of greenhouse gases; however, in many countries, the cement industry's contribution is a small fraction of that from fossil fuel combustion by power plants and motor vehicles. The nature of clinker and the enormous heat requirements of its manufacture allow the cement industry to consume a wide variety of waste raw materials and fuels, thus providing the opportunity to apply key concepts of industrial ecology, most notably the closing of loops through the use of by-products or wastes of other industries.
Components of present Invention Clinker
Portland cement is made primarily from finely ground clinker, which itself is composed dominantly of hydraulically active calcium silicate minerals formed through high-temperature burning of limestone and other materials in a kiln. The CaO and SiOa contents of the clinker sample employed in the present investigation has been found to be 64.60 percent and 21.90 percent respectively. The free lime content of the clinker sample was found to be 0.84 percent.
Mineralogical and micro structural investigations were carried out using X-ray diffraction and optical microscopic techniques. XRD of clinker sample indicate formation of normal clinker phases viz. C3S, C2S, C3A and C4AF along with periclase. The phase composition of clinker as determined by optical microscopy indicate the presence of 43 percent CaS and 35 percent C2S. The optical microscopy analysis further indicate that the clinker phases were moderately developed and in-homogeneously distributed. The minimum grain size of C3S and C2S were 3 and 2 micron respectively and the maximum sizes are 31 and 24 microns respectively. Majority of Alite grains were lath to pseudo-hexagonal in shape with broken outline. Numerous fused Alite grains were

also present in the clinker. Inclusions of Belite and unburnt particles are observed in Alite. Most of the Belite grains are subhedral in shape with corroded margins. Clusters of Belite were scattered through the clinker. Fused Belite grains are also present in the clinker. Clusters of unburnt raw meal were also observed in the clinker. Porosity was found to be high.
Gypsum
Gypsum is a naturally occurring mineral rich in CaO. Samples of gypsum employed in the present study were mixed thoroughly and part was drawn for its chemico-mineralogical evaluation. This was ground to a fineness of 100 micron.
The chemical analysis of gypsum sample was carried out and the results are given in 1 below along with results of clinker. The results indicate that the CaO and SO3 content are 23.89 and 25.75 percent respectively . The XRD diffractogram of the Gypsum sample indicate presence of calcium sulphate as the major mineral phase.
Table 1: Chemical composition clinker and gypsum used in the manufacture of cement blends

(Table Removed)


* Combined water at 220 °C
** SiO2 + IR

Spent catalyst
The chemical analysis spent FCC catalyst sourced from one of RFCC unit indicates that it contains 1.15 percent LOI, 60.35 percent SiO2, 33.12 percent A12O3 and 0.96 percent

Fe2O3 besides other minor impurities. The content of Ni and V was estimated to be 0.34 percent and 0.95 percent respectively.
Table 2, Chemical analysis of RFCC catalyst waste
(Table Removed)
The X-Ray diffraction analysis was carried out to identify the mineral phases present in a used catalyst. The investigations reveal that main mineral phase present Na2Al2Si4.7O13 4. x H2O and Mg2AUSi5O13 in case of used catalyst waste. It was observed that the catalyst looses its crystal Unity during use and tends to become more and more amorphous in nature.
The physical/thermal characterization of the used catalyst waste sample reveal that the bulk density and specific gravity of the material is 0.998 g/cc and 2.426 respectively. The catalyst waste sample is highly non plastic in nature and showed no fusion tendency up to 1450 °C. The lime reactivity of this material was found to be 96 kg/cm2 at a fineness of 7100 cm2/gm. The results of physical/thermal characterization and sieve analysis are given in Table 3.
Table 3, Physical/thermal properties of waste catalyst sample
(Table Removed)
The presence of TiO2, Fe2O3, Ni and V in the catalyst waste make it very sensitive for fired color. The catalyst waste sample was fired at 900,1100 and 1250 °C to see the fired color of this material. It is observed that the color at 900 °C is light brown which changes to light yellow at 1100°C and at 1250 °C changes to brown.
The grinding studies were conducted to see the grinding behavior of the used catalyst waste. The results of grinding studies are given in Table 4. The results indicate that the Blaine's fineness of the used catalyst waste on as received basis is 1680 cm2/gm. However after 8 minutes of grinding in the lab ball mill, the fineness increased to 2300 cm2/gm, after 19 minutes it was 3450 cm2/gm and after 30 minutes the fineness went as high as 6400 cm2/gm . The grinding study reveals that the material is soft to grind and can be easily accommodated during the inter-grinding of cement blends.
Table 4, Grinding studies of used catalyst waste sample
(Table Removed)
The chemical analysis and lime reactivity obtained is considered appropriate to use of this material in cement manufacture.

Objects of the Invention
The prime object of the present invention is to provide a process for employing huge quantity of catalyst waste generated in a petroleum refining industry in clinker for a cement composite and thus to find a solution for disposing of catalyst waste in a useful manner. Further object of present invention is to develop a cement composite having improved properties such as fineness, setting time and compressive strength employing waste catalyst.
Statement of the Invention
Accordingly, the present invention provides a route for employing catalyst waste in cement composite. Further method of employing spent catalyst in a cementing composite reduces load on grinding of some of clinker material. Further, thus prepared cementing composite possess improved performance of cement at optimum doses.
Detailed Description of the Present Invention
Accordingly, the present invention establishes use of spent catalyst in the preparation of cementing composite. The physico-chemical characteristics and high lime reactivity of catalyst waste is considered adequate for its use as blending material in cement manufacture. Accordingly, the experiment was designed to replace clinker by catalyst waste in the range of 1 - 30 percent by weight. The performance results of these blends were carefully studied. It is shown clinker grinding increases the cement fineness. On the other hand, while maintaining the fineness level of cement samples to 3200±200 cm2 /gm, there is a reduction in grinding time to 5-8 minutes. This clearly shows considerable saving in grinding time as well as grinding energy with the addition of E-Cat. By increasing the level of addition of Catalyst waste, the water demand also increases in the cementitious system. The setting time of cement blends decreases with increasing the quantity of catalytic waste .This phenomena can be attributed to the higher fineness of cement. The results of effect of catalyst waste on the compressive strength of mortars samples at 3, 7 & 28 days indicate that the compressive strength is improved with the addition of catalyst waste particularly at 28 day. For 1-15 percent addition of catalyst waste, the compressive strength of mortars is higher than that of the control cement. From

the interpretation of the performance evaluation results of various cement blends and their comparison with those of control cement clearly indicate that Catalyst waste can be added at the clinker grinding stage in the manufacture of cement.
More particularly, the present invention provides a cement composite having improved fineness, setting time and compressive strength, said cement composite comprising 1 to 50% by weight of spent zeolite catalyst, 40 to 96% by weight of clinkers and 1 to 10% by weight of gypsum.
In an embodiment of the present invention, the spent catalyst is an inorganic waste catalyst.
In another embodiment of the present invention, the spent catalyst is obtained from Fluid Catalytic Cracking (FCC) process, Deep Catalytic Cracking (DCC) process, Reforming, Hydro-treating and Hydro-cracking.
In yet another embodiment of the present invention, the spent catalyst contains 45 to 70 wt% of SiC-2, 30 to 95 wt% A12O3, 0.1 to 1.0 wt% of Fe2O3, 0.1 wt% to 1 wt% of CaO, 0.1 wt% to 0.5 wt% of MgO, 0.1 wt% to 0.7 wt% of Na2O, 0.1 wt% to 2.0 wt% of TiO2) 0.01 to 2 wt% of Vanadium and 0.01 wt% to 1 wt% of Nickel from 0.01 wt% to 1 wt%.
In still another embodiment of the present invention, the clinkers contains 18 to 25 % by weight of SiO2, 2 to 6% by weight of A12O3, 2 to 6% by weight of Fe2O3, 50 to 75 % by weight of CaO, 1 to 4% by weight of MgO, 0.2 to 2.0% by weight of K2O, 0.1 to 2.0% by weight of Na2O and 0.1 to 3.0% by weight of SO3.
In one more embodiment of the present invention, the gypsum used comprises SiO2 from 10wt% to 40 wt%, A12O3 from 0.1 wt% to 5 wt%, Fe2O3 from 1 wt% to 3 wt%, CaO from 10 wt% to 30 wt%, MgO from 1 wt% to 4 wt% and SO3 from 10 to 30 wt%.
In one another embodiment of the present invention, the final cementing composition possesses Blaine's fineness from 3000 cm2/gm to 8000 cm2/gm.

In a further embodiment of the present invention, the final cementing composition possesses setting time below about 250 minutes.
In a further more embodiment of the present invention, the compression strength of final cementing composition prepared from spent catalyst is about 430 Mpa.
The present invention also provides a process for preparing a cement composite as claimed in claim 1 having improved strength, said process comprising the step of mixing 1 to 50% by weight of spent zeolite catalyst, 40 to 96% by weight of clinkers and 1 to 10% by weight of gypsum to obtain a mixture and milling the mixture for a time period ranging from 10 minutes to 3 hours to obtain the cement composite.
In an embodiment of the present invention, spent catalyst used is a inorganic waste catalyst sourced from Fluid Catalytic Cracking (FCC) process, Deep Catalytic Cracking (DCC), Reforming, Hydrotreating and Hydrocracking.
In another embodiment of the present invention, the spent catalyst used has a composition of SiO2 from 45 wt% to 70 wt%, A12O3 from 30 wt% to 95 wt%, Fe2O3 from 0.1 wt% to 1 wt% CaO from 0.1 wt% to 1 wt%, MgO from 0.1 wt% to 0.5 wt%, Na2O 0.1 wt% to 0.7 wt% , TiO2 0.1 to 2 wt%, Vanadium from 0.01 wt% to 2 wt%, Nickel from 0.01 wt% to 1 wt%.
In yet another embodiment of the present invention, the clinker used is a synthetic mineral having SiO2 from 18wt% to 25 wt%, A12O3 from 2wt% to 6 wt%, Fe2O3 from 2 wt% to 6 wt%, CaO from 50 wt% to 75 wt%, MgO from 1 wt% to 4 wt%, K2O from 0.2 wt% to 2 wt%, Na2O from 0.1 to 2 wt% and SO3 from 0.1 to 3 wt%.
In still another embodiment of the present invention, the gypsum used is a naturally occurring mineral having Si02 from 10wt% to 40 wt%, A12O3 from 0.1 wt% to 5 wt%, Fe2O3 from 1 wt% to 3 wt%, CaO from 10 wt% to 30 wt%, MgO from 1 wt% to 4 wt% and SO3 from 10 to 30 wt%.

In one more embodiment of the present invention, the final cementing composition possess Elaine's fineness from 3000 cm2/gm to 8000 cm2/gm.
In one another embodiment of the present invention, the final cementing composition possess lower setting time of below 250 minutes.
In a further embodiment of the present invention, the compression strength of final cementing composition prepared from spent catalyst has increased from 340 Mpa to 430 Mpa.
1 to 50 % by weight of spent catalyst can be incorporated in different types of cements such as rapid hardening, pollazanic, low heat and flag cement. More particularly, it has been found that incorporation of about 15 % by weight of spent catalyst in almost all the afpresaid cements implants beneficial effects and also gives substantial cost reduction during the manufacturing process without effecting the properties of the cement when in use.
It is also within the purview of a person of ordinary skill in the art to incorporate spent catalyst in an amount in excess of 15% by weight, depending upon the raw materials used and the user specifications required.
Experiments
Example 1, Characterization of spent catalyst
Spent catalyst from one of RFCCU unit of IOC was subjected to a temperature of 720-750 °C. Due to exposure to such temperature, in presence of air any volatile material or unburnt coke if any present is burnt and voids in the material become vacant. Thus calcined catalyst waste was subjected to lime reactivity test. The results indicate that the lime reactivity of catalyst waste is 64 kg/cm2 at a fineness of 3400 cm2/gm, which increased to 96 kg/cm2 at a fineness level of 7100 cm2/gm. The lime reactivity of this order is considered adequate for its use as pozzolanic material in cement manufacture.
Table 5, Comparison of properties of catalyst waste as led down in is 1344 - 1981
for calcined clay pozoilana grade - i
(Table Removed)
Example 2, Preparation of cement blends using catalyst waste by intergrinding
Cement blends were prepared using clinker sample along with gypsum and catalyst waste. In all 8 cement blends (C-l, C-2, C-3,) including one control cement C-0 were prepared in the laboratory ball mill by inter grinding all the components. The details of various inter ground cement blends prepared are given in Table 6. Samples thus prepared were studied for the fineness, size gradation and physical performance such as setting time, consistency, compressive strength, soundness, heat of hydration and hydration products. Table 6, Weight composition of interground cement blends
(Table Removed)
Example 3, Effect of Catalyst Waste on Size Gradation and fineness of resultant Cement Blends
The cement samples were prepared in the laboratory ball mill by inter-grinding the catalyst waste with clinker and gypsum for different periods of time i.e. 25 and 35 minutes. It can be seen from Table 7 that addition of E-Cat in clinker grinding results in increase in cement fineness at constant grinding time of 35 minutes. The fineness of control cement sample (C-0) was found to be 3100 cm2/gm. The addition of catalyst in doses of 5, 15, 25 (by wt%) during clinker grinding for 35 minutes has shown, cement fineness of 3450, 4510 and 5580 cm2/gm respectively. Thus this example demonstrate that addition of catalytic waste increases the fineness of cement samples.
Table 7: Effect of catalyst waste addition on fineness of cement blends (35 minutes grinding)
(Table Removed)
Example 4, Catalyst waste addition reduces grinding time While maintaining the fineness level of cement samples (C-l to C-3) to 3200 ± 200 cm2 /gm, there is a reduction in grinding time to 3-8 minutes as shown in Table 8.
Table 8: Effect of catalyst waste addition on grinding time (maintaining fineness at 3200 + 200 cm2/gm)
(Table Removed)
Grinding time for cement blends with 5 and 15 wt% E-catalyst, to achieve a fineness of 3200 has been found to be 30 and 27 minutes respectively against grinding time of 35 minutes for control cement having zero E-Cat. This clearly shows considerable saving in grinding time as well as grinding energy with the addition of E-Cat.
Example 5, Water requirement of cement blends for consistent paste
The consistency of inter ground cement pastes (grinding time 35 minutes) containing 0, 5, 15, & 25 wt% catalytic waste was found to be 29, 32, and 35 wt% respectively. This is
attributed to the higher fineness of the inter ground cement blends attained due to the addition of catalyst waste, which has affinity for water. By increasing the level of addition of catalyst waste, the water demand increases in the cementitious system.
Table 9, Results of consistency test
(Table Removed)
Example 6, Setting time and compressive strength of cement blends containing Catalytic Waste
The cement blend, were prepared utilizing clinker, catalyst waste and gypsum. The clinker was replaced with catalyst waste with 5, 15, and 25 percent by weight during inter grinding. The performance evaluation of these cement blends (3 Nos.) were carried out as per relevant IS standards. The results of these evaluations are given in Table 10.
Table 10: performance evaluation of cement blends containing used catalyst waste ( 35 minutes grinding)
(Table Removed)
Table-10 shows the effect of catalyst (E-cat) on the compressive strength of mortars samples at 3, 7 & 28 days. The compressive strength was found to increase at early ages. Mortars samples made from catalyst waste added cement blends show higher strength
development as compared to that of control cement The increase in strength development is due to the acceleration of the hydration reaction and the initialization of pozzolanic reactions. Normally , replacement of cement in mortar or concrete by mineral admixtures would result in dilution effect and reduce the mechanical properties of the resultant material. In contrast, the compressive strength of cement would be increased if the inorganic fillers could increase the rate of cement hydration and initiate the pozzolanic reaction. Catalyst waste appears to be helping in this regard. For 1-15 percent addition of catalyst waste, the compressive strength of mortars is higher than that of the control cement. Beyond 15 percent, the dilution effect becomes dominant and the cement blends containing catalyst waste show lower strength development then that of control cement.
Similar trends were also observed in cement blends, namely , C-l, C-2, C-3 and C-4 in which the fineness level was controlled to 3200 + 200 cm2/gm. Table 11.
Table 11, Performance evaluation of cement blends containing used catalyst waste ( maintaining fineness at 3200_+ 200 cm2/gm)
(Table Removed)








We Claim:
1. A cement blend having improved setting and hardening characteristics resulting
in improved compressive strength and performance comprising of;
a) 1 to 50% by weight spent catalyst,
b) 40 to 96% by weight of clinkers,
c) 1 to 10% by weight of gypsum.

2. A cement blend as claimed in claim 1, where in spent catalyst is a inorganic waste catalyst from Fluid Catalyst Cracking (FCC) process, Deep Catalytic Cracking (DCC) process, Reforming, Hydrotreating and Hydrocracking which has a composition of SiO2 from 45 wt% to 70 wt%, Al2O3 from 30 wt% to 95 wt%, Fe2O3 from 0.1 wt% to 1 wt%, CaO from 0.1 wt% to 1 wt%, MgO from 0.1 wt% to 0.5 wt%, Na2O 0.1 wt% to 0.7 wt%, TiO2 0.1 wt% to 2 wt%, Vanadium from 0.01 wt% to 2 wt%, Nickel from 0.01 wt% to 1 wt%.
3. A cement blend as claimed in claim 1, wherein the clinkers contains 18-25% by weight of SiO2, 2 to 6 % by weight of A12O3, 2 to 6% by weight of Fe2O3, 50 to 75% by weight of CaO, 1 to 4 % by weight of MgO, 0.2 to 2.0% by weight of K2O, 0.1 wt% to 2.0 % by weight of Na20, 0.1 to 3.0 % by weight of SO3, and the gypsum contains SiO2from 10 wt% to 40 wt%, Al2O3from 0.1 wt% to 5 wt%, Fe2O3 from l wt% to 3 wt%, CaO from 10 wt% to 30 wt%, MgO from 1 wt% to 4 wt% and SO, from 10 to 30 wt%.
4. A cement blend as claimed in claim 1, wherein the cement blend always possess 28 days compressive strength more than 43 MPa in the fineness range of 3000 to 8000 cm2/gm.
5. A process for preparing a cement blend as claimed in claim 1, said process comprising the step of mixing 1 to 50% by weight of spent catalyst, 40 to 96% by weight of clinkers and 1 to 10% by weight of gypsum to obtain a mixture and milling the mixture for a time period ranging from 10 minutes to 3 hours to obtain the cement blend.
6. A process as claimed in claim 5, wherein the spent catalyst is an inorganic waste catalyst which is obtained from Fluid Catalytic Cracking (FCC) process, Deep Catalytic Cracking (DCC) process, Reforming Hydro-treating and Hydro-cracking and more specifically, the spent catalyst contains 45-70 wt% of SiO2, 30 to 95 wt% Al2O3, 0.1 to 1.0 wt% of Fe2O3, 0.1 wt% to 1 wt% of CaO, 0.1 wt% to 0.5 wt% of MgO, 0.1 wt% to 0.7 wt% of Na2O, 0.1 wt% to 2.0 wt% of TiO2, 0.01 to 2 wt% of Vanadium and 0.01 wt% to 1 wt% of Nickel from 0.01 wt% to 1 wt%.

Documents:

268-DEL-2004-Abstract-(10-12-2008).pdf

268-del-2004-abstract.pdf

268-DEL-2004-Claims-(10-12-2008).pdf

268-del-2004-claims.pdf

268-DEL-2004-Correspondence-Others-(10-12-2008).pdf

268-del-2004-correspondence-others.pdf

268-del-2004-correspondence-po.pdf

268-DEL-2004-Description (Complete)-(10-12-2008).pdf

268-del-2004-description (complete).pdf

268-DEL-2004-Form-1-(10-12-2008).pdf

268-del-2004-form-1.pdf

268-del-2004-form-18.pdf

268-DEL-2004-Form-2-(10-12-2008).pdf

268-del-2004-form-2.pdf

268-DEL-2004-Form-26-(10-12-2008).pdf

268-del-2004-form-26.pdf

268-del-2004-form-3.pdf

268-del-2004-form-5.pdf


Patent Number 235706
Indian Patent Application Number 268/DEL/2004
PG Journal Number 34/2009
Publication Date 21-Aug-2009
Grant Date 11-Aug-2009
Date of Filing 23-Feb-2004
Name of Patentee INDIAN OIL CORPORATION LIMITED
Applicant Address G-9, ALI YAVAR JUNG MARG, BANDRA (EAST), MUMBIA-400 051, INDIA
Inventors:
# Inventor's Name Inventor's Address
1 PANKAJ KASLIWAL INDIAN OIL CORPORATION LOMITED, RESEARCH AND DEVELOPMENT CENTER, SECTOR-13, FARIDABAD- 121 007, HARYANA
2 V. KRISHNAN INDIAN OIL CORPORATION LOMITED, RESEARCH AND DEVELOPMENT CENTER, SECTOR-13, FARIDABAD- 121 007, HARYANA
3 S. GHOSH INDIAN OIL CORPORATION LOMITED, RESEARCH AND DEVELOPMENT CENTER, SECTOR-13, FARIDABAD- 121 007, HARYANA
4 SATISH MAKHIJA INDIAN OIL CORPORATION LOMITED, RESEARCH AND DEVELOPMENT CENTER, SECTOR-13, FARIDABAD- 121 007, HARYANA
5 S. RAINA NATIONAL COUNCIL FOR CEMENT AND BUILDING MATERIALS, 34 KM STONE, DELHI-MATHURA ROAD (NH-2), BALLABGARH-121004,HARYANA
6 K. MOHAN NATIONAL COUNCIL FOR CEMENT AND BUILDING MATERIALS, 34 KM STONE, DELHI-MATHURA ROAD (NH-2), BALLABGARH-121004,HARYANA
7 K.M. SHARMA NATIONAL COUNCIL FOR CEMENT AND BUILDING MATERIALS, 34 KM STONE, DELHI-MATHURA ROAD (NH-2), BALLABGARH-121004,HARYANA
8 M.M. ALI NATIONAL COUNCIL FOR CEMENT AND BUILDING MATERIALS, 34 KM STONE, DELHI-MATHURA ROAD (NH-2), BALLABGARH-121004,HARYANA
9 S.K. CHATURVEDI NATIONAL COUNCIL FOR CEMENT AND BUILDING MATERIALS, 34 KM STONE, DELHI-MATHURA ROAD (NH-2), BALLABGARH-121004,HARYANA
10 D. YADAV NATIONAL COUNCIL FOR CEMENT AND BUILDING MATERIALS, 34 KM STONE, DELHI-MATHURA ROAD (NH-2), BALLABGARH-121004,HARYANA
11 S.K. AGARWAL NATIONAL COUNCIL FOR CEMENT AND BUILDING MATERIALS, 34 KM STONE, DELHI-MATHURA ROAD (NH-2), BALLABGARH-121004,HARYANA
PCT International Classification Number C04B 35/00
PCT International Application Number N/A
PCT International Filing date
PCT Conventions:
# PCT Application Number Date of Convention Priority Country
1 NA