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U.S. Department of Energy
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Pretreatment of solid carbonaceous material with dicarboxylic aromatic acids to prevent scale formation

Patent ·
OSTI ID:864227
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.
Research Organization:
Exxon Research and Engineering Co.
DOE Contract Number:
EF-77-A-01-2893
Assignee:
Exxon Research & Engineering Co. (Florham Park, NJ)
Patent Number(s):
US 4332668
OSTI ID:
864227
Country of Publication:
United States
Language:
English