DAVID SPENCER MITCHELL
Pilots at Idylberry Rd, San Rafael, CA

4183800, Jan 15, 1980

Mar 28, 1978

5/891084

David S. Mitchell - San Rafael CA
David R. Sageman - San Rafael CA

Chevron Research Company - San Francisco CA

C10G 100

208 8R

A continuous process is disclosed for the retorting of oil shale or other similar hydrocarbon containing solids. Heat carrier particles at an elevated temperature are introduced into an upper portion of a retort and pass downwardly therethrough, fluidized by an upwardly flowing non-oxidizing gas introduced in a lower portion of the retort. The hydrocarbon-containing solids are introduced into an intermediate portion of the retort; a first portion thereof being entrained by the gas and flowing upwardly through the retort and a second portion thereof being fluidized by the gas and flowing downwardly through said retort. Retorted fluidized solids and heat carrier particles are removed from a lower portion of the retort and a product stream of hydrocarbon vapors mixed with the entrained retorted solids and fluidizing gas is recovered overhead.

4389300, Jun 21, 1983

Sep 26, 1979

6/079300

David S. Mitchell - San Rafael CA

Chevron Research Company - San Francisco CA

C10G 104

208 11LE

A method for solvent extracting extractable materials from solids is disclosed, which includes (a) maintaining a vertically extending bed comprising said solids in a vertically extending extraction zone and introducing said mixture into an upper portion of said bed; (b) providing a substantially continuous gaseous phase in contact with a lower portion of said bed; (c) maintaining a substantially continuous liquid phase comprising a vaporizable primary liquid solvent and at least one secondary liquid solvent in contact with at least a lower part of said upper portion of said bed above said gaseous phase, said liquid phase and said gaseous phase having an interface at a vertically intermediate level of said bed; (d) introducing said primary liquid solvent into an intermediate liquid level in said liquid phase spaced from the top of said liquid phase; (e) introducing at least one secondary liquid solvent into said liquid phase above said intermediate liquid level; (f) passing said primary and secondary solvents through said liquid phase, extracting said extractable component from said mixture into said liquid phase, and removing said extractable component and said solvents from said extraction zone; (g) preventing said liquid phase from flowing downwardly through said lower portion of said bed by maintaining said gaseous phase at a pressure sufficient to support said liquid phase thereon and vaporizing said primary solvent adhering to solids in said lower portion of said bed; and (h) removing solids from said lower portion of said bed.

4137053, Jan 30, 1979

Mar 17, 1978

5/887700

David S. Mitchell - San Rafael CA
David R. Sageman - San Rafael CA

Chevron Research Company - San Francisco CA

C10J 346, C10J 354

48197R

A continuous process and apparatus are disclosed for the retorting or gasification of hydrocarbon-containing solids such as oil shale, coal, tar sands, etc. , wherein the solids are retorted or gasified in a combined entrained and fluidized bed. A solid fluidized heat-transfer material flows downwardly through a conversion zone. Subdivided hydrocarbon-containing solids are introduced into a central portion of the conversion zone, with smaller particles of the solids being entrained and moving upwardly through the conversion zone countercurrent to the flow of the fluidized heat-transfer material, and larger particles of the solids being fluidized and moving downwardly through the conversion zone concurrent with the flow of the heat-transfer material. A fluidizing gas is injected into a lower portion of the conversion zone and a portion of the solids is combusted, providing the necessary heat for the conversion reactions. Substantially plug flow of the heat-transfer solid and the hydrocarbon-containing solids is maintained by including in the conversion zone means for impeding back mixing, such as a packing material filling the conversion zone.

4451184, May 29, 1984

Jun 12, 1981

6/272951

David S. Mitchell - San Rafael CA

Chevron Research Company - San Francisco CA

B65G 5358

406105

The instant disclosure relates to the feeding of pulverized hydrocarbonaceous solids, such as coal, coke, tar sands, oil shale, etc. , into a high pressure reactor for retorting or gasification of the solids. The pulverized hydrocarbonaceous solids are mixed with a motive fluid and pressurized in a jet ejector. The pulverized solid/motive fluid mixture is then separated by a cyclone separator. The operation may be repeated in successive stages to achieve the desired pressures. The pressurized solids from the cyclone separator are introduced into the reactor, and motive fluid from the separator is recirculated to the jet ejector.

4481099, Nov 6, 1984

Sep 26, 1979

6/079121

David S. Mitchell - San Rafael CA

Chevron Research Company - San Francisco CA

C10G 104

208 11LE

A method is disclosed for solvent-extracting an extractable component from a mixture including the extractable component and subdivided solids, comprising: (a) maintaining a vertically extending bed comprising said solids in a vertically extending extraction zone and introducing said mixture into an upper portion of said bed; (b) providing a substantially continuous gaseous phase in contact with a lower portion of said bed; (c) maintaining a substantially continuous liquid phase comprising a vaporizable liquid solvent in contact with at least a lower part of an upper portion of said bed; (d) introducing said solvent into said liquid phase at at least two vertically spaced levels of said liquid phase; (e) extracting said extractable component from said mixture with said solvent; (f) withdrawing said solvent and said extractable component from said liquid phase between said two vertically spaced levels; (g) preventing said liquid phase from flowing downwardly through said lower portion of said bed by maintaining said gaseous phase at a pressure sufficient to support said liquid phase thereon and vaporizing solvent adhering to solids in said lower portion of said bed; and (h) withdrawing solids from said lower portion of said bed.

4443229, Apr 17, 1984

Jan 31, 1983

6/462161

David Sageman - San Rafael CA
David S. Mitchell - San Rafael CA

Chevron Research Company - San Francisco CA

C10J 346, C10J 354

48197R

A coal gasification process is disclosed wherein two portions of heat transfer material are introduced into the reaction vessel at different locations and different temperatures. Steam is passed upwardly through the vessel to react with the carbonaceous material to form a hot char and a gaseous product, wherein the heat necessary for the coal gasification reaction is supplied by both the first portion of heat transfer material and the second portion of heat transfer material. Then the hot char and gaseous product are cooled by contact with the first portion of heat transfer material.

2012006, Mar 22, 2012

Jun 10, 2011

13/134604

Dennis R. Cash - Novato CA, US
Graham J. Forder - San Rafael CA, US
David S. Mitchell - San Rafael CA, US
Joe W. Rosenthal - Lafayette CA, US

4CRGroup LLC - San Rafael CA

C10G 69/06

208 67

A process for the production of high yields of high quality products from heavy hydrocarbonaceous feedstock is provided comprising a two-stage, close-coupled process, wherein the first stage comprises a thermal-catalytic zone into which is introduced a mixture comprising the feedstock, coal, dispersed catalyst, and hydrogen; and the second, close-coupled stage comprises a catalytic-hydrotreating zone into which substantially all the effluent from the first stage is directly passed and processed under hydrotreating conditions.

4191540, Mar 4, 1980

Mar 27, 1978

5/890886

David S. Mitchell - San Rafael CA
David R. Sageman - San Rafael CA

Chevron Research Company - San Francisco CA

C10J 354

48197R

Disclosed is an improved CO. sub. 2 acceptor process for the gasification of carbonaceous solids to produce H. sub. 2, CO and CH. sub. 4. In the process a hot calcined CO. sub. 2 acceptor solid and a carbonaceous solid are contacted in countercurrent plug-like flow in a gasification vessel filled with packing or other suitable internals. The CO. sub. 2 acceptor flows downwardly through the vessel in a fluidized state, countercurrent to entrained carbonaceous solid flowing upwardly through said vessel. The heat of gasification is provided by sensible heat transfer from the calcined CO. sub. 2 acceptor solid to the carbonaceous solid and by the exothermic heat of reaction of the calcined CO. sub. 2 acceptor with CO. sub. 2 generated in the process.

4157245, Jun 5, 1979

Jun 3, 1977

5/802999

David S. Mitchell - San Rafael CA
David R. Sageman - San Rafael CA

Chevron Research Company - San Francisco CA

C10J 346, C10J 354, C10B 4922

48197R

A process is disclosed for contacting at least two solids and a fluid, particularly for retorting and/or gasification of solid carbonaceous materials such as coal, coke, shale or tar sands by introducing a solid heat-transfer material into an upper portion of a treatment or contacting zone and a solid carbonaceous material into a lower portion of the treatment or contacting zone. The solid heat carrier is fluidized by an upflowing gas and moves downwardly, while the solid carbonaceous materials are entrained and move upwardly. The fluidizing gas may be inert or reactive. Substantially countercurrent plug flow of the two solids in the treatment or contacting zone is maintained by including means for preventing back mixing, such as a packing material filling the treatment or contacting zone.

4401551, Aug 30, 1983

Sep 14, 1979

6/075624

David S. Mitchell - San Rafael CA

Chevron Research Company - San Francisco CA

C10G 104

208 11LE

A method for extracting bitumen from bituminous sand is disclosed, in which the bituminous sand is contacted with previously recovered bitumen at a temperature sufficient to maintain the previously recovered bitumen as a liquid, and the resulting liquids are separated from the resulting solids.