Vinayan Nair

US Patent:

56889755, Nov 18, 1997

Filed:

Apr 10, 1996

Appl. No.:

8/630317

Inventors:

Vinayan Nair - Oak Park IL
Deng-Yang Jan - Elk Grove Village IL
Robert Lyle Patton - Rolling Meadows IL
Ben A. Wilson - Algonquin IL
Donald F. Best - Mahopac NY

Assignee:

UOP - Des Plaines IL

International Classification:

B01J 2904
B01J 2987

US Classification:

549531

Abstract:

Molecular sieve compositions have been synthesized which are resistant to the loss of framework atoms. Specifically, the molecular sieves of the invention have the empirical formula mA: (M. sub. w Al. sub. x Si. sub. y)O. sub. 2 where A is at least one rare earth metal, M is chromium or titanium and "m", "w", "x" and "y" are the mole fractions of A, M, Al and Si respectively. Applicants have discovered that the rare earth metals prevent loss of chromium and titanium from the framework and degradation of the molecular sieve. Along with the composition, a process for preparing the composition and processes using the composition are disclosed and claimed.

US Patent:

59857820, Nov 16, 1999

Filed:

Feb 19, 1997

Appl. No.:

8/801333

Inventors:

Ben A. Wilson - Algonquin IL
Robert Lyle Patton - Rolling Meadows IL
Vinayan Nair - Darien IL
Deng-Yang Jan - Elk Grove Village IL
Hemant B. Gala - Arlington Heights IL

Assignee:

UOP LLC - Des Plaines IL

International Classification:

B01J 2906

US Classification:

502 85

Abstract:

Applicants have prepared a novel zeolite identified as LZ-281. This zeolite has the framework topology of zeolite EMT. The LZ-281 zeolite is prepared by removing framework aluminum atoms from EMC-2 zeolite while simultaneously replacing the aluminum atoms with extraneous silicon atoms. This increases the SiO. sub. 2 /Al. sub. 2 O. sub. 3 ratio versus the starting EMC-2 zeolite and results in the LZ-281 zeolite having increased thermal stability, increased number and/or strength of acid sites and increased activity in hydrocarbon processes requiring strong acid sites.

US Patent:

53713117, Dec 6, 1994

Filed:

Jul 27, 1993

Appl. No.:

8/097739

Inventors:

Vinayan Nair - Oak Park IL
Donald F. Best - Mahopac NY
Gregory J. Gajda - Mount Prospect IL

Assignee:

UOP - Des Plaines IL

International Classification:

C10G 4716
C10G 1105
C07C 212
C07C 522

US Classification:

585467

Abstract:

Forms of zeolite Omega synthesized by hydrothermal crystallization from reaction systems containing alkali metal cations and organic templating agents, modified by calcination in air, ion-exchange, steam calcination and treatment with a low-pH aqueous ammonium ion solution, are significantly improved with respect to surface area, catalytic activity and adsorption capacities for large molecular species. The zeolite compositions of the invention may be used in a variety of hydrocarbon conversion reactions.

US Patent:

51927276, Mar 9, 1993

Filed:

Aug 19, 1991

Appl. No.:

7/747050

Inventors:

Vinayan Nair - East White Plains NY
Donald F. Best - Mahopac NY
Lawrence D. Vail - Tappan NY

Assignee:

UOP - Des Plaines IL

International Classification:

B01J 2906

US Classification:

502 64

Abstract:

Zeolite LZ-202 and other zeolites synthesized in the absence of organic templating agents and having a crystal structure isotypic with the mineral mazzite are subjected to a three-step treatment to greatly increase their surface area, catalytic activity and adsorptive capacity for adsorbates having molecular dimensions as large as the SF. sub. 6 molecule. The treatment steps involve an initial conventional NH. sub. 4. sup. + ion-exchange, steaming at temperatures in excess of 300. degree. C. and a low-pH NH. sub. 4. sup. + ion-exchange at pH values below 4.

US Patent:

51397617, Aug 18, 1992

Filed:

Jan 6, 1992

Appl. No.:

7/795911

Inventors:

Vinayan Nair - Yonkers NY
Donald F. Best - Mahopac NY

Assignee:

UOP - Des Plaines IL

International Classification:

C01B 3334

US Classification:

423328

Abstract:

Forms of zeolite Omega synthesized by hydrothermal crystallization from reaction systems containing alkali metal cations and organic templating agents, modified by calcination in air, ion-exchange, steam calcination and treatment with a low-pH aqueous ammonium ion solution, are significantly improved with respect to surface area, catalytic activity and adsorption capacities for large molecular species.

US Patent:

62004638, Mar 13, 2001

Filed:

Aug 3, 1999

Appl. No.:

9/366513

Inventors:

Ben A. Wilson - Algonquin IL
Robert Lyle Patton - Rolling Meadows IL
Vinayan Nair - Darien IL
Deng-Yang Jan - Elk Grove Village IL
Hemant B. Gala - Arlington Heights IL

Assignee:

UOP LLC - Des Plaines IL

International Classification:

B01J 2906
C10G 4700

US Classification:

20811101

Abstract:

Applicants have prepared a novel zeolite identified as LZ-281. This zeolite has the framework topology of zeolite EMT. The LZ-281 zeolite is prepared by removing framework aluminum atoms from EMC-2 zeolite while simultaneously replacing the aluminum atoms with extraneous silicon atoms. This increases the SiO. sub. 2 /Al. sub. 2 O. sub. 3 ratio versus the starting EMC-2 zeolite and results in the LZ-281 zeolite having increased thermal stability, increased number and/or strength of acid sites and increased activity in hydrocarbon processes requiring strong acid sites.

US Patent:

55368956, Jul 16, 1996

Filed:

Dec 6, 1994

Appl. No.:

8/349777

Inventors:

Vinayan Nair - Oak Park IL
Donald F. Best - Mahopac NY
Gregory J. Gajda - Mount Prospect IL

Assignee:

UOP - Des Plaines IL

International Classification:

C07C 522

US Classification:

585480

Abstract:

Forms of zeolite Omega synthesized by hydrothermal crystallization from reaction systems containing alkali metal cations and organic templating agents, modified by calcination in air, ion-exchange, steam calcination and treatment with a low-pH aqueous ammonium ion solution, are significantly improved with respect to surface area, catalytic activity and adsorption capacities for large molecular species. A catalyst comprising zeolite Omega is effective for isomerization of aromatics and aliphatics.

US Patent:

52307905, Jul 27, 1993

Filed:

May 18, 1992

Appl. No.:

7/884920

Inventors:

Vinayan Nair - East White Plains NY
Donald F. Best - Mahopac NY

Assignee:

UOP - Des Plaines IL

International Classification:

C10G 4716
C10G 1105
C07C 212
C07C 522

US Classification:

208111

Abstract:

Hydrocarbon conversion reactions are carried out over a catalyst composition containing forms of zeolite Omega synthesized by hydrothermal crystallization from reaction systems containing alkali metal cations and organic templating agents which have been modified by calcination in air, ion-exchange, steam calcination and treatment with a low-pH aqueous ammonium ion solution.