Subhasis Bhattacharya, 591784 Blakesley Dr, San Ramon, CA 94582
Subhasis Bhattacharya Phones & Addresses
1784 Blakesley Dr, San Ramon, CA 94582
1826 Pomar Way, Walnut Creek, CA 94598 925-9441496
935 Broad St, Bloomfield, NJ 07003 973-4292733
Richmond, CA
Edison, NJ
Nutley, NJ
Chevy Chase Village, MD
Larkspur, CA
Chevy Chase Village, MD
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Mentions for Subhasis Bhattacharya
Publications & IP owners
Us Patents
Selective Staging Hydrocracking
US Patent:
2010020, Aug 12, 2010
Filed:
Feb 10, 2009
Appl. No.:
12/368903
Inventors:
Subhasis Bhattacharya - Walnut Creek CA, US
International Classification:
C10G 65/00
US Classification:
208 59
Abstract:
This invention is directed to a high conversion hydrocracking (HCR) unit to produce premium middle distillate fuel. Unconverted oil which is low in sulfur is fed to a Fluid Catalytic Cracking (FCC) unit. The process results in reduced hydrogen consumption and optimum reactor capacity. Feed is hydrotreated and separated into liquid and vapor streams. The vapor stream is passed to further processing and light ends recovery. The liquid stream is passed to a vacuum distillation column, where it is separated into at least three streams, the first stream comprising low boiling products and light ends, a second, higher boiling stream comprising the feed to a second hydroprocessing zone and third stream comprising unconverted oil. The second stream is passed to the second hydroprocessing zone, producing effluents which boil in the distillate range. The second hydroprocessing zone is generally a fuels hydrocracking unit.
Solvent-Enhanced Biomass Liquefaction
US Patent:
2012000, Jan 12, 2012
Filed:
Apr 4, 2011
Appl. No.:
13/079777
Inventors:
James STEVENS - Katy TX, US
Michelle YOUNG - Manvel TX, US
Daniel EUHUS - Corvallis OR, US
Alex COULTHARD - Sugarland TX, US
Doug NAAE - Sugarland TX, US
Kerry SPILKER - Houston TX, US
Jason HICKS - Granger IN, US
Subhasis BHATTACHARYA - Walnut Creek CA, US
Paul SPINDLER - Katy TX, US
Michelle YOUNG - Manvel TX, US
Daniel EUHUS - Corvallis OR, US
Alex COULTHARD - Sugarland TX, US
Doug NAAE - Sugarland TX, US
Kerry SPILKER - Houston TX, US
Jason HICKS - Granger IN, US
Subhasis BHATTACHARYA - Walnut Creek CA, US
Paul SPINDLER - Katy TX, US
International Classification:
C10L 1/00
B01J 19/00
B01J 19/00
US Classification:
44307, 422208, 422187
Abstract:
The present invention provides an improved method for solvent liquefaction of biomass to produce liquid products such as transportation fuel. The method uses a novel solvent combination that promotes liquefaction relatively quickly, and it reduces the need to transport large amounts of hydrogen or hydrogen-carrying solvents. It operates at lower pressure than previous methods, does not require a catalyst or hydrogen gas or CO input, and provides very high conversion of biomass into a bio-oil that can be further processed in a petroleum refinery. It also beneficially provides a way to recycle a portion of the crude liquefaction product for use as part of the solvent combination for the biomass liquefaction reaction.
Targeted Hydrogenation Hydrocracking
US Patent:
2009015, Jun 25, 2009
Filed:
Dec 21, 2007
Appl. No.:
12/004751
Inventors:
Subhasis Bhattacharya - Walnut Creek CA, US
International Classification:
C10G 69/02
US Classification:
208 58
Abstract:
This invention is directed to a process scheme in which a partial conversion hydrocracking (HCR) unit, preferably preceded by a hydrotreating unit, feeds unconverted oil to a FCC (fluid catalytic cracking ) unit. Most refineries run the FCC unit at the full capacity for optimal asset utilization. During shutdowns of Residue Desulfurization unit(s) which feed an FCC unit, it is desirable to reduce the conversion in the FCC feed hydrocracker. In this way, the feed to FCC unit is maximized. Jet and Diesel products that conform to specifications may be produced during low conversion HCR operation. Furthermore, undesirable over-saturation of the unconverted oil (UCO) from the HCR unit feeding the FCC unit can be avoided. Excess hydrogen consumption can also be avoided. Normally, further aromatic saturation of the middle distillate products from a low conversion HCR is achieved in a separate, post treatment, unit.
Improved Production Of Heavy Api Group Ii Base Oil
US Patent:
2017006, Mar 9, 2017
Filed:
Sep 9, 2015
Appl. No.:
14/848917
Inventors:
- San Ramon CA, US
Subhasis Bhattacharya - Walnut Creek CA, US
Axel Brait - San Rafael CA, US
Subhasis Bhattacharya - Walnut Creek CA, US
Axel Brait - San Rafael CA, US
International Classification:
C10G 67/16
C10M 101/00
C10M 177/00
C10M 101/00
C10M 177/00
Abstract:
A process for heavy base oil production, comprising: a. performing an aromatic extraction of a first hydrocarbon feed to produce an aromatic extract, and a waxy raffinate; b. mixing the aromatic extract with a second hydrocarbon feed to make a mixed feed having greater than 2,000 wt ppm sulfur; c. feeding the mixed feed to a hydroprocessing unit to produce a heavy API Group II base oil having a kinematic viscosity at 70 C. from 22.6 to 100 mm/s. An integrated refinery process unit for making heavy base oils, comprising: a. an aromatic extraction unit fluidly connected to a solvent dewaxing unit and a hydroprocessing unit; b. a first line from the aromatic extraction unit, that feeds an aromatic extract to a second hydrocarbon feed to make a mixed feed having greater than 2,000 wt ppm sulfur; and c. a connection that feeds the mixed feed to the hydroprocessing unit.
Method For Making Middle Distillates And A Heavy Vacuum Gas Oil Fcc Feedstock
US Patent:
2015013, May 21, 2015
Filed:
Nov 14, 2014
Appl. No.:
14/541874
Inventors:
Subhasis Bhattacharya - Walnut Creek CA, US
Ujjal Kumar Mukherjee - Montclair NJ, US
Marvin I. Greene - Hackensack NJ, US
Ujjal Kumar Mukherjee - Montclair NJ, US
Marvin I. Greene - Hackensack NJ, US
Assignee:
Chevron U.S.A. Inc. - San Ramon CA
International Classification:
C10G 65/12
C10G 65/10
C10G 65/10
US Classification:
208 57, 208 59
Abstract:
The present invention is directed to a refining process for producing hydroprocessed distillates and a heavy vacuum gas oil (HVGO). The process produces middle distillates that have reduced nitrogen and sulfur content, while simultaneously producing a 900 F. (482 C.) HVGO stream useful as a fluidized catalytic cracking (FCC) unit feedstock.
Two-Stage Hydrocracking Process For Making Heavy Lubricating Base Oil From A Heavy Coker Gas Oil Blended Feedstock
US Patent:
2015006, Mar 12, 2015
Filed:
Sep 11, 2014
Appl. No.:
14/483331
Inventors:
Subhasis Bhattacharya - Walnut Creek CA, US
Assignee:
CHEVRON U.S.A. INC. - San Ramon CA
International Classification:
C10G 65/10
C10G 7/00
C10G 7/00
US Classification:
208 59
Abstract:
The present invention is directed to a refining process for producing heavy lubricating base oils (LBO) from a blended hydrocarbonaceous feedstock containing a heavy coker gas oil, a visbroken gas oil, heavy cycle oil, oils from residue hydrocracking, aromatic extract or any other feedstock normally not conducive to lube oil basestock production, using a two-stage hydrocracking process.
Solvent-Enhanced Biomass Liquefaction
US Patent:
2014037, Dec 18, 2014
Filed:
Sep 4, 2014
Appl. No.:
14/476834
Inventors:
Michelle K. YOUNG - Manvel TX, US
Daniel D. EUHUS - Corvallis OR, US
Alexander Bruce COULTHARD - Sugarland TX, US
Douglas G. NAAE - Sugarland TX, US
Kerry Kennedy SPILKER - Houston TX, US
Jason Christopher HICKS - Notre Dame IN, US
Subhasis BHATTACHARYA - Walnut Creek CA, US
Paul M. SPINDLER - Katy TX, US
Daniel D. EUHUS - Corvallis OR, US
Alexander Bruce COULTHARD - Sugarland TX, US
Douglas G. NAAE - Sugarland TX, US
Kerry Kennedy SPILKER - Houston TX, US
Jason Christopher HICKS - Notre Dame IN, US
Subhasis BHATTACHARYA - Walnut Creek CA, US
Paul M. SPINDLER - Katy TX, US
Assignee:
CHEVRON U.S.A. INC. - San Ramon CA
International Classification:
C10G 1/04
B01D 11/02
B01D 11/02
US Classification:
585240, 422187, 422242, 25218311
Abstract:
The present invention provides an improved method for solvent liquefaction of biomass to produce liquid products such as transportation fuel. The method uses a novel solvent combination that promotes liquefaction relatively quickly, and it reduces the need to transport large amounts of hydrogen or hydrogen-carrying solvents. It operates at lower pressure than previous methods, does not require a catalyst or hydrogen gas or CO input, and provides very high conversion of biomass into a bio-oil that can be further processed in a petroleum refinery. It also beneficially provides a way to recycle a portion of the crude liquefaction product for use as part of the solvent combination for the biomass liquefaction reaction.
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