CO.sub.2 Pretreatment prevents calcium carbonate formation
Patent
·
OSTI ID:863593
- Baytown, TX
- Buffalo Grove, IL
- 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.
- Assignee:
- Exxon Research & Engineering Co. (Florham Park, NJ)
- Patent Number(s):
- US 4206033
- OSTI ID:
- 863593
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
/208/
100
14
200
34
68
accomplished
atmospheres
believed
calcium
calcium carbonate
carbon
carbon dioxide
carbonaceous
carbonaceous material
carbonaceous materials
carbonate
carbonate formation
coals
components
convert
corresponding
corresponding carbonate
degree
dioxide
formation
liquefaction
materials
partial
partial pressure
pressure
pretreatment
prevented
prevents
prior
range
ranking
ranking coals
reduced
scale
scale formation
scale-forming
scale-forming components
significantly
significantly reduce
significantly reduced
similar
similar carbonaceous
temperature
total
total pressure
100
14
200
34
68
accomplished
atmospheres
believed
calcium
calcium carbonate
carbon
carbon dioxide
carbonaceous
carbonaceous material
carbonaceous materials
carbonate
carbonate formation
coals
components
convert
corresponding
corresponding carbonate
degree
dioxide
formation
liquefaction
materials
partial
partial pressure
pressure
pretreatment
prevented
prevents
prior
range
ranking
ranking coals
reduced
scale
scale formation
scale-forming
scale-forming components
significantly
significantly reduce
significantly reduced
similar
similar carbonaceous
temperature
total
total pressure