Chaya R Venkat

6617482, Sep 9, 2003

Aug 16, 2000

09/639555

Chaya Rao Venkat - Sedona AZ
John Paul McWilliams - Swedesboro NJ
Ronald A. Weiss - Flemington NJ

ExxonMobil Chemical Patents Inc. - Houston TX

C07C 266

585448, 585467, 585820, 585823, 585824

A process is described for removing polar compounds from an aromatic feedstock which contains polar compounds and which is then used in an alkylation process. The process comprises contacting the feedstock in an adsorption zone at a temperature of less than or equal to 130Â C. with an adsorbent selective for the adsorption of said polar compounds and comprising a molecular sieve having pores and/or surface cavities with cross-sectional dimensions greater than 5. 6 Angstroms. A treated feedstock substantially free of said polar compounds is withdrawn from the adsorption zone and fed to an alkylation zone for contact under liquid phase alkylation conditions with an alkylating agent in the presence of an alkylation catalyst.

6670517, Dec 30, 2003

Aug 24, 2000

09/644999

Jeevan Sahib Abichandani - Houston TX
Chaya Rao Venkat - Sedona AZ
Dominick Nicholas Mazzone - Wenonah NJ

Exxon Mobil Chemical Patents Inc. - Houston TX

C07C 266

585467, 585446, 585323

A process for alkylating aromatics is provided which comprises contacting an aromatic-containing feed with alkylating agent in the presence of a silica-bound ZSM-5 zeolite catalyst, wherein the ZSM-5 has a crystal size no greater than 0. 05 micron, said contacting being conducted under alkylating conditions to provide a product containing a monoalkylated aromatic fraction and a polyalkylated aromatic fraction, wherein the polyalkylated aromatic fraction contains at least 40 wt. % of the para-dialkylaromatic species. The polyalkylated aromatic fraction may be contacted with unsubstituted aromatic and a transalkylation catalyst under transalkylating conditions to provide a mono-alkylated aromatic-rich stream, e. g. , an ethylbenzene-rich stream.

6753452, Jun 22, 2004

Feb 27, 2003

10/375784

Chaya R. Venkat - Sedona AZ
John P. McWilliams - Swedesboro NJ
Ronald A. Weiss - Flemington NJ

ExxonMobil Chemical Patents Inc. - Houston TX

C07C 266

585448, 585467, 585820, 585823, 585824

A process is described for removing polar compounds from an aromatic feedstock which contains polar compounds. The process comprises contacting the feedstock in an adsorption zone at a temperature of less than or equal to 130Â C. with an adsorbent selective for the adsorption of said polar compounds and comprising a molecular sieve having surface cavities with cross-sectional dimensions greater than 5. 6 Angstroms. A treated feedstock substantially free of said polar compounds can then be fed to an alkylation zone for contact under liquid phase alkylation conditions with an alkylating agent in the presence of an alkylation catalyst.

6909026, Jun 21, 2005

Dec 13, 2002

10/318882

Ajit B. Dandekar - Marlton NJ, US
Thomas Francis Degnan - Moorestown NJ, US
John P. McWilliams - Woolwich Twp NJ, US
Chaya R. Venkat - Sedona AZ, US

ExxonMobil Oil Corporation - Irving TX

C07C002/68

585467

The catalyst becomes at least partially deactivated by sorbing catalyst poisons present in the feed during a process for alkylating aromatics by contacting a feed containing benzene, toluene, xylenes, alkylbenzenes, naphthalene or substituted naphthalenes under liquid phase alkylating conditions with C-Colefins in the presence of MCM-22, MCM-36, MCM-49, MCM-56, ZSM-5, ZSM-11, ZSM-12, ZSM-23, ZSM-35, ZSM-48, ZSM-50, ZSM-4, ZSM-18, ZSM-20, Zeolite X, Zeolite Y, USY, mordenite or offretite to provide an alkylated aromatic product. The at least partially deactivated catalyst can be treated in situ by contacting with at least one polar compound having a dipole moment of at least 0. 05 Debyes and selected from the group consisting of acetic acid, formic acid, water, and carbon monoxide, under conditions of temperature and pressure employed in the liquid phase alkylating conditions which are sufficient to at least partially desorb the catalyst poison from the catalyst.

56000480, Feb 4, 1997

Dec 27, 1994

8/364145

Jane C. Cheng - Clarksburg NJ
C. Morris Smith - Princeton NJ
Chaya R. Venkat - Princeton NJ
Dennis E. Walsh - Richboro PA

Mobil Oil Corporation - Fairfax VA

C07C 266

585449

There is provided a process for preparing ethylbenzene using liquid phase alkylation and vapor phase transalkylation. The liquid phase alkylation reaction may be catalyzed by an acidic solid oxide, such as MCM-22, MCM-49 and MCM-56. The vapor phase transalkylation may be catalyzed by a medium-pore size zeolite such as ZSM-5. The process may be run continuously with the continuous introduction of fresh benzene feed containing at least 500 ppm of nonbenzene hydrocarbon impurities. The combined ethylbenzene product of these alkylation and transalkylation reactions has very low levels of impurities including xylene, hydrocarbons having 7 or less carbon atoms and hydrocarbons having 9 or more carbon atoms.

48926469, Jan 9, 1990

May 2, 1988

7/189454

Chaya Venkat - Princeton NJ
Darrell D. Whitehurst - Titusville NJ

Mobil Oil Corporation - New York NY

C10G 1105
C10G 4720
C10G 4718
B01J 2938

208111

A method for treating a porous crystalline catalyst optionally associated with a metal component such as a noble and/or base metal(s) is described. The method comprises contacting the catalyst with a low molecular weight aromatic compound under coking conditions. Such a treatment method increases the cycle length and the useful life of the catalyst. Using the treated catalyst in a dewaxing process and regenerating the catalyst by treating with hydrogen and a low molecular weight hydrocarbon.

54060150, Apr 11, 1995

May 28, 1993

8/069260

Jeffrey S. Beck - Princeton NJ
Sharon B. McCullen - Newtown PA
David H. Olson - Pennington NJ
Chaya R. Venkat - Princeton NJ

Mobil Oil Corp. - Fairfax VA

C07C 552

585475

A process for shape selective hydrocarbon conversion that involves contacting a hydrocarbon feedsteam, including ethylbenzene, under conversion conditions with a catalytic molecular sieve which has been modified by being ex situ selectivated with a silicon compound. The ex situ selectivation involves exposing the molecular sieve to at least two silicon impregnation sequences, each sequence comprising an impregnation with a silicon compound followed by calcination. The modified catalyst used in the process may also be steamed. Optionally, the modified catalyst may be trim-selectivated.

48286788, May 9, 1989

Jul 9, 1987

7/071246

Chaya Venkat - Princeton NJ
Darrell D. Whitehurst - Titusville NJ

Mobil Oil Corporation - New York NY

C10G 1105
C10G 4716

208111

In the cataytic cracking of gas oils or heavier feeds, retarded catalyst aging is achieved by adding lighter saturated hydrocarbons such as paraffins and/or cycloparaffins to the feed together with employing a highly siliceous zeolite as the cracking catalyst. The unconverted light hydrocarbon may be recovered and recycled. The invention is applicable to fluid catalytic cracking for the manufacture of gasoline and light fuel oil, and also to the catalytic dewaxing process wherein normal paraffins are selectively cracked to reduce the pour point of a fuel oil or of a lubricant based stock.