Pretreatment of solid carbonaceous material with dicarboxylic ar

Details Pretreatment of solid carbonaceous material with dicarboxylic ar Pretreatment of solid carbonaceous material with dicarboxylic ar

1979-03-26

1982-06-01

Garvin, Patrick

Mineral oils: processes and products

Phenolic or toxic oils

208 8R, C10G 104, C10G 100

Patent

active

043326684

ABSTRACT:
Scale formation during the liquefaction of lower ranking coals and similar carbonaceous materials is significantly reduced and/or prevented by pretreatment with a pretreating agent selected from the group consisting of phthalic acid, phthalic anhydride, pyromellitic acid and pyromellitic anhydride. The pretreatment is believed to convert the scale-forming components to the corresponding phthalate and/or pyromellitate prior to liquefaction. The pretreatment is accomplished at a total pressure within the range from about 1 to about 2 atmospheres. Temperature during pretreatment will generally be within the range from about 5.degree. to about 80.degree. C.

REFERENCES:
patent: 2221410 (1940-11-01), Pier
patent: 4161440 (1979-07-01), Brunson
Monthly Technical Progress Report FE-2353-3, Exxon Res. & Eng. Co., Aug. 1977, p. 8.
Monthly Technical Progress Report FE-2353-6, Exxon Res. & Eng. Co. Nov., 1977, p. 43.
Monthly Technical Progress Report FE-2353-9, Exxon Res. & Eng. Co., Dec. 1977, pp. 61-62.

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