Two-stage pyrolysis of coal for producing liquid hydrocarbon fuels
AssigneeResearch Foundation of the City Univ. of NY
InventorRobert A. Graff
Life of this patent
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Abstract
Increased yields of liquid hydrocarbon are obtained from a carbonaceous material (e.g., coal) by a two-stage process comprising pretreatment of the carbonaceous material with an appropriate gas in a first stage, followed by pyrolysis of the pretreated carbonaceous material, in a second stage.
Claims18
A process for the production of liquid hydrocarbon fuels from a carbonaceous material which consists of:
- (a) pretreating said carbonaceous material with a gas selected from the group consisting of steam, inert gases, carbon monoxide and mixtures thereof, in the absence of added hydrogen at a temperature of from about 280.degree. C. to about 370.degree. C., under a pressure of from about 1 to about 100 atmospheres, for a period of about a fraction of a second to about 30 minutes,
- (b) pyrolyzing said pretreated carbonaceous material in the presence of a gas selected from the group consisting of steam, nitrogen, helium, carbon monoxide, combustion gases, pyrolysis gases and mixtures thereof, and
- (c) recovering liquid hydrocarbons from said pyrolysis products.
A process for recovering liquid hydrocarbon values of a carbonaceous material which consists of:
- (a) continuously contacting said carbonaceous material with a gas, in a pretreatment zone, said gas being selected from the group consisting of steam, inert gases, carbon monoxide and mixtures thereof, in the absence of added hydrogen at a pressure of from about 1 to about 100 atmospheres, temperature of from about 280.degree. C. to about 370.degree. C. for a period of from about a fraction of a second to about 30 minutes,
- (b) continuously pyrolyzing pretreated carbonaceous material in a gas selected from the group consisting of steam, helium, nitrogen, carbon monoxide, combustion gases, pyrolysis gases and mixtures thereof, and
- (c) recovering liquid hydrocarbons from said pyrolysis products.
A process for the production of liquid hydrocarbon fuels from coal which consists of:
- (a) pretreating the coal with a gas selected from the group consisting of steam, inert gases, carbon monoxide and mixtures thereof, in the absence of added hydrogen, at a temperature of from about 280.degree. C. to about 370.degree. C. under a pressure of from about 1 to about 100 atmospheres, for a period of about a fraction of a second to about 30 minutes;
- (b) pyrolizing said pretreated coal in the presence of a gas selected from the group consisting of steam, nitrogen, helium, carbon monoxide, combustion gases, pyrolysis gases and mixtures thereof, and
- (c) recovering liquid hydrocarbons from said pyrolysis products.
A process for recovering liquid hydrocarbon values from coal which consists of:
- (a) continuously contacting coal with a gas in a pretreatment zone, said gas being selected from the group consisting of steam, inert gases, carbon monoxide and mixtures thereof, and in the absence of added hydrogen in said pretreatment zone, at a pressure of from about 1 to 100 atmospheres, and a temperature of from about 280.degree. C. to about 370.degree. C. for a period of about a fraction of a second to about 30 minutes;
- (b) continuously pyrolyzing said pretreated coal in a gas selected from the group consisting of steam, nitrogen, helium, carbon monoxide, combusion gases, pyrolysis gases and mixtures thereof, and
- (c) recovering liquid hydrocarbons from said pyrolysis products.
Dependencies are inferred from the claim text.