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Title: Pretreatment of solid carbonaceous material with dicarboxylic aromatic acids to prevent scale formation

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.

Inventors:
 [1]
  1. (Buffalo Grove, IL)
Issue Date:
Research Org.:
Exxon Research and Engineering Co.
OSTI Identifier:
864227
Patent Number(s):
4332668
Assignee:
Exxon Research & Engineering Co. (Florham Park, NJ) OSTI
DOE Contract Number:  
EF-77-A-01-2893
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
pretreatment; solid; carbonaceous; material; dicarboxylic; aromatic; acids; prevent; scale; formation; liquefaction; ranking; coals; similar; materials; significantly; reduced; prevented; pretreating; agent; selected; consisting; phthalic; acid; anhydride; pyromellitic; believed; convert; scale-forming; components; corresponding; phthalate; pyromellitate; prior; accomplished; total; pressure; range; atmospheres; temperature; degree; 80; scale formation; significantly reduce; scale-forming components; ranking coals; total pressure; carbonaceous materials; carbonaceous material; solid carbonaceous; significantly reduced; similar carbonaceous; agent selected; solid carbon; prevent scale; /208/

Citation Formats

Brunson, Roy J. Pretreatment of solid carbonaceous material with dicarboxylic aromatic acids to prevent scale formation. United States: N. p., 1982. Web.
Brunson, Roy J. Pretreatment of solid carbonaceous material with dicarboxylic aromatic acids to prevent scale formation. United States.
Brunson, Roy J. Fri . "Pretreatment of solid carbonaceous material with dicarboxylic aromatic acids to prevent scale formation". United States. https://www.osti.gov/servlets/purl/864227.
@article{osti_864227,
title = {Pretreatment of solid carbonaceous material with dicarboxylic aromatic acids to prevent scale formation},
author = {Brunson, Roy J.},
abstractNote = {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.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1982},
month = {1}
}

Patent:

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