Pretreatment of solid carbonaceous material with dicarboxylic aromatic acids to prevent scale formation
Patent
·
OSTI ID:6406329
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 to about 80/sup 0/ C.
- Assignee:
- Exxon Research and Engineering Co
- Patent Number(s):
- US 4332668
- OSTI ID:
- 6406329
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
01 COAL, LIGNITE, AND PEAT
010405* -- Coal
Lignite
& Peat-- Hydrogenation & Liquefaction
ANHYDRIDES
BROWN COAL
CARBONACEOUS MATERIALS
CARBOXYLIC ACIDS
COAL
COAL LIQUEFACTION
COMMINUTION
CONTROL
DICARBOXYLIC ACIDS
ENERGY SOURCES
FOSSIL FUELS
FUELS
HYDROGEN TRANSFER
LIGNITE
LIQUEFACTION
MATERIALS
ORGANIC ACIDS
ORGANIC COMPOUNDS
PARTICLE SIZE
PHTHALIC ACID
SCALE CONTROL
SCALING
SIZE
SOLVENTS
SUBBITUMINOUS COAL
THERMOCHEMICAL PROCESSES
010405* -- Coal
Lignite
& Peat-- Hydrogenation & Liquefaction
ANHYDRIDES
BROWN COAL
CARBONACEOUS MATERIALS
CARBOXYLIC ACIDS
COAL
COAL LIQUEFACTION
COMMINUTION
CONTROL
DICARBOXYLIC ACIDS
ENERGY SOURCES
FOSSIL FUELS
FUELS
HYDROGEN TRANSFER
LIGNITE
LIQUEFACTION
MATERIALS
ORGANIC ACIDS
ORGANIC COMPOUNDS
PARTICLE SIZE
PHTHALIC ACID
SCALE CONTROL
SCALING
SIZE
SOLVENTS
SUBBITUMINOUS COAL
THERMOCHEMICAL PROCESSES