Pretreatment of solid carbonaceous material with dicarboxylic aromatic acids to prevent scale formation
Patent
·
OSTI ID:864227
- Buffalo Grove, IL
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
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Related Subjects
/208/
80
accomplished
acid
acids
agent
agent selected
anhydride
aromatic
atmospheres
believed
carbonaceous
carbonaceous material
carbonaceous materials
coals
components
consisting
convert
corresponding
degree
dicarboxylic
formation
liquefaction
material
materials
phthalate
phthalic
pressure
pretreating
pretreatment
prevent
prevent scale
prevented
prior
pyromellitate
pyromellitic
range
ranking
ranking coals
reduced
scale
scale formation
scale-forming
scale-forming components
selected
significantly
significantly reduce
significantly reduced
similar
similar carbonaceous
solid
solid carbon
solid carbonaceous
temperature
total
total pressure
80
accomplished
acid
acids
agent
agent selected
anhydride
aromatic
atmospheres
believed
carbonaceous
carbonaceous material
carbonaceous materials
coals
components
consisting
convert
corresponding
degree
dicarboxylic
formation
liquefaction
material
materials
phthalate
phthalic
pressure
pretreating
pretreatment
prevent
prevent scale
prevented
prior
pyromellitate
pyromellitic
range
ranking
ranking coals
reduced
scale
scale formation
scale-forming
scale-forming components
selected
significantly
significantly reduce
significantly reduced
similar
similar carbonaceous
solid
solid carbon
solid carbonaceous
temperature
total
total pressure