Method for producing SNG or SYN-gas from wet solid waste and low

Gas: heating and illuminating – Processes – Fuel mixtures

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48197A, 48202, 48209, 252373, 260449M, 2604495, 423359, 423551, 423554, C10J 300, C10K 300

Patent

active

042512271

ABSTRACT:
Peat, lignite, coal, many forms of biomass (land or marine) and solid wastes may have from 1/2 to 30 times as much water associated with the dry solids. Some of this water may be chemically bound or otherwise may be practically inseparable by mechanical means. The solids may be partially oxidized by oxygen or air in the first chemical reactions of a Wet Air Oxidation (WAO) taking place in the presence of the large amount of water at temperatures of 175.degree. C. to 325.degree. C. and pressures of 10 to 100 atmospheres--preferably 240.degree. to 300.degree. C. and 70 to 100 atmospheres. All sulfur in high sulfur coal is oxidized selectively to the sulfate radical; and heat to bring the combustible up to the necessary temperature is supplied by burning part of the combustible itself. The sulfur free coal may be used as conventionally. Residual solids (now 70 to 95% of the original fuel) have a higher heating value on a dry basis, and are mechanically separated from all but 1/2 to 2 pounds of water. These solids come from the dewatering unit at a high pressure and may be passed, without loss of pressure or temperature, to be gasified in conventional processes and gasifiers, again by partial oxidation.

REFERENCES:
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patent: 2773026 (1906-12-01), Cederquist
patent: 3632479 (1972-01-01), Lee et al.
patent: 3692634 (1972-09-01), Othmer
patent: 3909211 (1975-09-01), Diaz et al.
patent: 3909212 (1975-09-01), Schroeder
patent: 3920506 (1975-11-01), Morgan
patent: 4017421 (1977-04-01), Othmer
patent: 4054420 (1977-10-01), Longbach
patent: 4055400 (1977-10-01), Stambaugh et al.
Chemical Engineers Handbook, 4th Edition, Perry, pp. 19-40, 1963.

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