Hydrothermal pretreatment to prevent scale during liquefaction of certain solid carbonaceous materials

Patent · Tue May 22 00:00:00 EDT 1984

OSTI ID:6435549

Stone, J B; Floyd, F M

Scale formation during the liquefaction of lower ranking coals and similar carbonaceous materials is significantly reduced and/or prevented by hydrothermal pretreatment. The said pretreatment is believed to convert the scale-forming components to the corresponding carbonate prior to liquefaction. The said pretreatment is accomplished at a total pressure within the range from about 1000 to about 4400 psia. Temperature during said pretreatment will generally be within the range from about 500/sup 0/ to about 700/sup 0/ F.

• Assignee: Exxon Research and Engineering Co.
• Patent Number(s): US 4450066
• OSTI ID: 6435549
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
010405* -- Coal
Lignite
& Peat-- Hydrogenation & Liquefaction
ALKALINE EARTH METAL COMPOUNDS
CARBON COMPOUNDS
CARBONACEOUS MATERIALS
CARBONATES
CHEMICAL REACTORS
COAL LIQUEFACTION
COAL RANK
CONTROL
HIGH PRESSURE
HIGH TEMPERATURE
LIQUEFACTION
MATERIALS
MEDIUM PRESSURE
OXYGEN COMPOUNDS
SCALE CONTROL
THERMOCHEMICAL PROCESSES