Liquefaction process

Details Liquefaction process Liquefaction process

1979-12-10

1981-12-08

Gantz, Delbert E.

Mineral oils: processes and products

Phenolic or toxic oils

C10G 100, C10G 106

Patent

active

043046550

ABSTRACT:
Scale formation during the liquefaction of lower ranking coals and similar carbonaceous materials is significantly reduced and/or prevented by pretreatment with a combination of pretreating agents comprising SO.sub.2 and an oxidizing agent. It is essential to effective operation that the moisture content of the solid carbonaceous material be within the range from about 10 to about 25 wt %, based on dry solid carbonaceous material, during the pretreatment. The pretreatment is believed to convert at least a portion of the scale-forming components and particularly calcium, to the corresponding sulfate prior to liquefaction. The pretreatment may be accomplished with the combination of pretreating agents either simultaneously by using a mixture comprising SO.sub.2 and a gaseous oxidizing agent or sequentially by first treating with SO.sub.2 and then with an oxidizing agent.

REFERENCES:
patent: T700485 (1969-04-01), Hemminger et al.
patent: 1436289 (1922-11-01), Plauson
patent: 1840287 (1932-01-01), Hofmann et al.
patent: 2133280 (1938-10-01), Burk
patent: 2191156 (1940-02-01), Pier et al.
patent: 2221410 (1940-11-01), Pier
patent: 4120664 (1978-10-01), Gleim
patent: 4161440 (1979-07-01), Brunson
Pauling, College Chemistry, (1951), Pub. by W. H. Freeman and Co., San Francisco, Calif., pp. 364-366.

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