CO.sub.2 Pretreatment prevents calcium carbonate formation

Patent · Tue Jan 01 00:00:00 EST 1980

OSTI ID:863593

Neavel, Richard C ^[1]; Brunson, Roy J ^[2]; Chaback, Joseph J ^[3]

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1. Baytown, TX
2. Buffalo Grove, IL
3. Worthington, OH

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.

• DOE Contract Number: E(49-18)-2353
• Assignee: Exxon Research & Engineering Co. (Florham Park, NJ)
• Patent Number(s): US 4206033
• OSTI ID: 863593
• Country of Publication: United States
• Language: English

Related Subjects

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/