Liquefaction of calcium-containing coals

Patent · Tue Aug 30 04:00:00 EDT 1983

OSTI ID:5618229

Urban, P

An improved process is disclosed for the treatment and liquefaction of calcium-containing subbituminous coal and coals of lower rank to form water soluble compounds of calcium, thereby suppressing the formation of scale, made up largely of calcium carbonate which normally forms with the coal liquefaction zone, e.g. on reactor surfaces, lines, auxiliary equipment and the like. An oxide of sulfur is contacted with a coal feed sufficient to impregnate the pores of the coal. The impregnated coal is then contacted with hydrogen sulfide to produce water soluble thiosulfate. After the treated coal is liquefied in a coal liquefaction zone, the effluent is water washed to remove water soluble thiosulfate.

• Assignee: UOP Inc.
• Patent Number(s): US 4401549
• OSTI ID: 5618229
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
010405* -- Coal
Lignite
& Peat-- Hydrogenation & Liquefaction
ALKALINE EARTH METALS
CALCIUM
CARBONACEOUS MATERIALS
CHALCOGENIDES
COAL
COAL LIQUEFACTION
COAL PREPARATION
CONTROL
ELEMENTS
ENERGY SOURCES
FOSSIL FUELS
FUELS
LIQUEFACTION
MATERIALS
METALS
OXIDES
OXYGEN COMPOUNDS
SCALE CONTROL
SULFUR COMPOUNDS
SULFUR OXIDES
THERMOCHEMICAL PROCESSES