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Title: CO.sub.2 Pretreatment prevents calcium carbonate formation

Abstract

Scale formation during the liquefaction of lower ranking coals and similar carbonaceous materials is significantly reduced and/or prevented by pretreatment with carbon dioxide. The carbon dioxide pretreatment is believed to convert the scale-forming components to the corresponding carbonate prior to liquefaction. The pretreatment is accomplished at a total pressure within the range from about 14 to about 68 atmospheres and a carbon dioxide partial pressure within the range from about 14 to about 34 atmospheres. Temperature during pretreatment will generally be within the range from about 100.degree. to about 200.degree. C.

Inventors:
 [1];  [2];  [3]
  1. (Baytown, TX)
  2. (Buffalo Grove, IL)
  3. (Worthington, OH)
Issue Date:
OSTI Identifier:
863593
Patent Number(s):
4206033
Assignee:
Exxon Research & Engineering Co. (Florham Park, NJ) OSTI
DOE Contract Number:  
E(49-18)-2353
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
pretreatment; prevents; calcium; carbonate; formation; scale; liquefaction; ranking; coals; similar; carbonaceous; materials; significantly; reduced; prevented; carbon; dioxide; believed; convert; scale-forming; components; corresponding; prior; accomplished; total; pressure; range; 14; 68; atmospheres; partial; 34; temperature; 100; degree; 200; scale formation; significantly reduce; scale-forming components; ranking coals; total pressure; carbonaceous materials; carbon dioxide; carbonaceous material; partial pressure; calcium carbonate; significantly reduced; similar carbonaceous; carbonate formation; corresponding carbonate; /208/

Citation Formats

Neavel, Richard C., Brunson, Roy J., and Chaback, Joseph J. CO.sub.2 Pretreatment prevents calcium carbonate formation. United States: N. p., 1980. Web.
Neavel, Richard C., Brunson, Roy J., & Chaback, Joseph J. CO.sub.2 Pretreatment prevents calcium carbonate formation. United States.
Neavel, Richard C., Brunson, Roy J., and Chaback, Joseph J. Tue . "CO.sub.2 Pretreatment prevents calcium carbonate formation". United States. https://www.osti.gov/servlets/purl/863593.
@article{osti_863593,
title = {CO.sub.2 Pretreatment prevents calcium carbonate formation},
author = {Neavel, Richard C. and Brunson, Roy J. and Chaback, Joseph J.},
abstractNote = {Scale formation during the liquefaction of lower ranking coals and similar carbonaceous materials is significantly reduced and/or prevented by pretreatment with carbon dioxide. The carbon dioxide pretreatment is believed to convert the scale-forming components to the corresponding carbonate prior to liquefaction. The pretreatment is accomplished at a total pressure within the range from about 14 to about 68 atmospheres and a carbon dioxide partial pressure within the range from about 14 to about 34 atmospheres. Temperature during pretreatment will generally be within the range from about 100.degree. to about 200.degree. C.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1980},
month = {1}
}

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