John L Haas

US Patent:

45198101, May 28, 1985

Filed:

Jun 17, 1983

Appl. No.:

6/505529

Inventors:

John C. Haas - El Sobrante CA

Assignee:

Chevron Research Company - San Francisco CA

International Classification:

C10J 354

US Classification:

48202

Abstract:

A method of controlling the solids circulation between a downflow reactor and an entrained bed reactor is disclosed wherein at least some of the solids are transferred from the downflow reactor to a crossflow fluidized bed through a first seal leg, wherein the crossflow fluidized bed has a baffle separating the crossflow fluidized bed into two zones. Then the solids are transferred from the crossflow fluidized bed to the entrained bed reactor, and the solids are transferred from the entrained bed reactor to the downflow reactor through a second seal leg. The solids circulation rate is controlled by adjusting the rate of fluidizing gas entering the crossflow fluidized bed.

US Patent:

44445695, Apr 24, 1984

Filed:

Jan 14, 1983

Appl. No.:

6/457855

Inventors:

John C. Haas - El Sobrante CA

Assignee:

Chevron Research Company - San Francisco CA

International Classification:

C10J 346
C10J 354

US Classification:

48197R

Abstract:

A carbonaceous material, such as coal, is gasified in a vertically elongated reaction vessel having a lower portion, an upper portion, and a re-entrainment zone which is located above the upper portion. The effective diameter of the upper portion of the vessel is larger than that of the lower portion of the vessel and the re-entrainment zone. A gasification agent is passed upwardly through the vessel at a rate sufficient to entrain the coal and fluidize a heat-transfer material in the lower portion of the vessel. The gasification agent reacts with the coal to form a hot char and a gaseous product, with the necessary heat being supplied by the heat-transfer material. In this process, the heat-transfer material substantially flows downwardly in the reaction vessel, in a fluidized state or an unfluidized state through the upper portion of the vessel and in a fluidized state through the lower portion of the vessel. The coal substantially flows upwardly in the reaction vessel, in an entrained state through the lower portion of the vessel and the re-entrainment zone, and in a fluidized state through the upper portion of the vessel. An advantage of this process is that the upper portion serves to increase the residence time of the carbonaceous solids in the reaction vessel thereby increasing yields and lowering the average height of the reaction vessel, and the sensible heat is extracted from the product gas before it leaves the reactor.