Pretreatment of solid carbonaceous material with dicarboxylic aromatic acids to prevent scale formation

Patent · Tue Jun 01 00:00:00 EDT 1982

OSTI ID:6406329

Brunson, R J

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
• Resource Relation: Patent File Date: Filed date 26 Mar 1979; Other Information: PAT-APPL-023565
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
COAL
SCALE CONTROL
LIGNITE
COAL LIQUEFACTION
SUBBITUMINOUS COAL
ANHYDRIDES
COMMINUTION
HYDROGEN TRANSFER
PARTICLE SIZE
PHTHALIC ACID
SCALING
SOLVENTS
BROWN COAL
CARBONACEOUS MATERIALS
CARBOXYLIC ACIDS
CONTROL
DICARBOXYLIC ACIDS
ENERGY SOURCES
FOSSIL FUELS
FUELS
LIQUEFACTION
MATERIALS
ORGANIC ACIDS
ORGANIC COMPOUNDS
SIZE
THERMOCHEMICAL PROCESSES
010405* - Coal
Lignite
& Peat- Hydrogenation & Liquefaction