US 4,391,699 AGranted

Coal liquefaction process

AssigneeChevron Research Company

InventorJoel W. Rosenthal

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Abstract

Disclosed is a two-stage process for the production of liquid hydrocarbons from coal. More particularly, disclosed is a two-stage coal liquefaction process wherein subdivided coal is substantially dissolved in a solvent in a first non-catalytic dissolving stage at the temperature in the range 750.degree. to 900.degree. F. In a second stage, the mixture of solvent, dissolved coal and insoluble solids is contacted with a hydrocracking catalyst at a critical temperature below 800.degree. F. The normally liquid portion of the hydrocracker effluent product has a surprisingly low sulfur content of less than 0.1 weight percent, a low nitrogen content of less than 0.5 weight percent, and a high API gravity of at least -3.

Claims28

Dependent claims

A process for liquefying coal comprising:

(a) mixing subdivided coal with a solvent to form a coal-solvent slurry;
(b) heating said slurry in a dissolving zone to a temperature in the range of 750.degree.-900.degree. F. at a pressure above 500 psig in the presence of added hydrogen to form a first effluent comprising normally liquid components, non-distillable oil components, and undissolved solids;
(c) passing at least a portion of said first effluent into a reaction zone, said portion comprising non-distillable oil components, and contacting said portion with hydrogen in the presence of an externally provided hydrogenation catalyst under hydrogenation conditions, including a temperature below 800.degree. F. and lower than the temperature in said dissolving zone;
(d) withdrawing a second effluent from said reaction zone, said second effluent comprising normally liquid components and non-distillable oil components;
and
(e) recycling at least a portion of said second effluent to step (a), said recycle portion comprising both normally liquid components and non-distillable oil components.

3 more elements

Dependencies are inferred from the claim text.

Facts

Application: 06/345,281Filed 3 Feb 1982 · continuation
Priority: 27 Dec 1976
Granted: 5 Jul 1983
Term ends: Not estimatedThe source records don’t support an estimate.

Classification3 codes

C10G 47/00
Cracking of hydrocarbon oils, in the presence of hydrogen or hydrogen- generating
C10G 1/002
Production of liquid hydrocarbon mixtures from oil-shale, oil-sand, or non-melting solid carbonaceous or similar materials, e.g. wood, coal: in…
C10G
Cracking hydrocarbon oils

Family

Serial754,198Parent of this continuation · filed 27 Dec 1976
US 4,330,389 AParent of this continuation
US 4,391,699 AThis patent

From the US filing history. Foreign family members aren’t listed.

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