Gautham J Krishnaiah

US Patent:

20110101554, May 5, 2011

Filed:

Apr 23, 2010

Appl. No.:

12/766724

Inventors:

Gautham Krishnaiah - Ellicott City MD, US
John Lettow - Washington DC, US

Assignee:

VORBECK MATERIALS CORP. - Jessup MD

International Classification:

C01B 31/02
B29C 43/22

US Classification:

264 291

Abstract:

Processes for preparing or handling graphene sheets wherein low bulk density graphene sheets are compressed. The graphene sheets may be produced by a thermal treatment such as exfoliation of precursor or reduction or annealing of previously existing graphene sheets and conveyed in a closed system to a compression apparatus.

US Patent:

20120128570, May 24, 2012

Filed:

Oct 10, 2009

Appl. No.:

13/123312

Inventors:

Gautham Krishnaiah - Ellicott City MD, US
Vipin Varma - Gent, BE

Assignee:

Vorbeck Materials Corp. - Jessup MD

International Classification:

C01B 31/04
C01B 31/00
B82Y 40/00
B82Y 30/00

US Classification:

4234151, 423448, 977842, 977734

Abstract:

A process for the preparation of graphite oxide from graphite using a permanganate salt and an aqueous sulfuric acid solution. The graphite oxide may be further reacted to form graphene sheets.

US Patent:

55714820, Nov 5, 1996

Filed:

Apr 27, 1992

Appl. No.:

7/874590

Inventors:

Steve L. Long - Katy TX
Joseph L. Ross - Dallas TX
Gautham Krishnaiah - Katy TX

Assignee:

Stone & Webster Engineering Corporation - Boston MA

International Classification:

B01J 3832
F27B 1508

US Classification:

422144

Abstract:

A catalyst cooler apparatus and process for use with a two-stage regeneration system in a fluidized catalytic cracking process having a device to remove hot catalyst from the second regeneration zone at a point above the air distribution ring under the surface of the catalyst bed equivalent to the catalyst exit to the reactor, a heat exchanger for indirect heat exchange and cooling of the catalyst and a return device for returning the cooled catalyst to the second regeneration zone at or near the bottom of the catalyst bed, beneath the air distribution ring.

US Patent:

20220194878, Jun 23, 2022

Filed:

Dec 22, 2020

Appl. No.:

17/130260

Inventors:

Gautham Krishnaiah - Houston TX, US
Brian Heasley - Cypress TX, US
Rahul Radhakrishna Pillai - Manvel TX, US
Vijender K. Verma - Houston TX, US
Narinder Singh Duggal - Haryana, IN

Assignee:

KELLOGG BROWN & ROOT LLC - Houston TX

International Classification:

C07C 7/11
C07C 2/12
C07C 7/00
C07C 7/09
B01J 8/02
B01D 53/14
B01D 53/18

Abstract:

Methods and systems for treating an olefin-containing stream are disclosed. The disclosed methods and systems are particularly suitable for treating an off-gas stream in a refining or petrochemical process, such as from a fluid catalytic cracker (FCC), coker, steam cracker, and the like. The stream is treated in an absorber column to reject lighter stream components and to absorb ethylene and/or propylene into a solvent. The solvent is typically isobutane. The enriched solvent stream from the absorber column is fed to an alkylation reactor, which reacts the dissolved olefin with the isobutane solvent to produce an alkylate product.

US Patent:

20200361838, Nov 19, 2020

Filed:

May 18, 2020

Appl. No.:

16/877403

Inventors:

- Fairfield NJ, US
Vamsi M. Vadhri - North Arlington NJ, US
Narendra Joshi - Jersey City NJ, US
Grace Brock - Caldwell NJ, US
Gautham Krishnaiah - Houston TX, US
Michael Tallman - Houston TX, US

Assignee:

Kellogg Brown & Root LLC - Houston TX

International Classification:

C07C 5/333
B01J 23/06
B01J 21/12
B01J 21/06
B01J 38/12

Abstract:

A catalyst, methods of making, and process of dehydrogenating paraffins utilizing the catalyst. The catalyst includes at least 20 mass % Zn, a catalyst support and a catalyst stabilizer. The catalyst is further characterizable by physical properties such as activity parameter measured under specified conditions. The catalyst may also be disposed on a porous support in an attrition-resistant form and used in a fluidized bed reactor.

US Patent:

20200101445, Apr 2, 2020

Filed:

Sep 28, 2019

Appl. No.:

16/586981

Inventors:

- Fairfield NJ, US
- Houston TX, US
Narendra Joshi - Fairfield NJ, US
Grace Brock - Fairfield NJ, US
Gautham Krishnaiah - Houston TX, US
Michael Tallman - Houston TX, US

International Classification:

B01J 23/06
B01J 35/02
B01J 21/06
B01J 21/08
B01J 23/10
B01J 21/04
B01J 35/10
B01J 37/02
B01J 37/08
B01J 38/12
B01J 35/00
C07C 5/333

Abstract:

The invention relates to a catalyst composition suitable for the dehydrogenation of paraffins having 2-8 carbon atoms comprising zinc oxide and titanium dioxide, optionally further comprising oxides of cerium (Ce), dysprosium (Dy), erbium (Er), europium (Eu), gadolinium (Gd), lanthanum (La), neodymium (Nd), praseodymium (Pr), samarium (Sm), terbium (Tb), ytterbium (Yb), yttrium (Y), tungsten (W) and Zirconium (Zr) or mixtures thereof, wherein said catalyst composition is substantially free of chromium and platinum. The catalysts possess unique combinations of activity, selectivity, and stability. Methods for preparing improved dehydrogenation catalysts and a process for dehydrogenating paraffins having 2-8 carbon atoms, comprising contacting the mixed metal oxide catalyst with paraffins are also described. The catalyst may also be disposed on a porous support in an attrition-resistant form and used in a fluidized bed reactor.

US Patent:

20150136647, May 21, 2015

Filed:

Nov 21, 2013

Appl. No.:

14/086675

Inventors:

Gautham KRISHNAIAH - Ellicott City MD, US
Yongchao Li - Katy TX, US
Yonglin Yang - Katy TX, US

Assignee:

KELLOGG BROWN & ROOT LLC - Houston TX

International Classification:

C10G 51/02

US Classification:

208 74, 422187

Abstract:

Methods and systems. For producing diesel arc provided. The method for producing diesel can include cracking a first hydrocarbon feed in a first riser under first cracking conditions to provide a first effluent containing a first light cycle oil, a heavy cycle oil, and a first bottoms and Fractionating at least a portion of the first effluent to separate the first bottoms and the heavy cycle oil from the first light cycle oil. The method can include cracking the separated first bottoms in a second riser under second cracking conditions to produce a second effluent containing a second light cycle oil and a second bottoms. The method can also include cracking the separated heavy cycle oil in the first riser under third cracking conditions to provide a third effluent and mixing the third effluent with the first hydrocarbon feed to provide the first cracking conditions.