Liquefaction of calcium-containing subbituminous coals and coals of lower rank

Patent · 01 January 1979

OSTI ID:863384

Brunson, Roy J ^[1]

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1. Baytown, TX

An improved process for the treatment of a calcium-containing subbituminous coal and coals of lower rank to form insoluble, thermally stable calcium salts which remain within the solids portions of the residue on liquefaction of the coal, thereby suppressing the formation of scale, made up largely of calcium carbonate which normally forms within the coal liquefaction reactor (i.e., coal liquefaction zone), e.g., on reactor surfaces, lines, auxiliary equipment and the like. An oxide of sulfur, in liquid phase, is contacted with a coal feed sufficient to impregnate the pores of the coal. The impregnated coal, in particulate form, can thereafter be liquefied in a coal liquefaction reactor (reaction zone) at coal liquefaction conditions without significant formation of scale.

• Other Award/Contract Number: E(49-18)-2353
• Assignee: Exxon Research & Engineering Co. (Florham Park, NJ)
• Patent Number(s): US 4161440
• OSTI ID: 863384
• Country of Publication: United States
• Language: English

Related Subjects

/208/44/
auxiliary
auxiliary equipment
bituminous coal
bituminous coals
calcium
calcium carbonate
calcium salts
calcium-containing
calcium-containing subbituminous
carbonate
coal
coal feed
coal liquefaction
coals
conditions
contacted
equipment
feed
form
form insoluble
formation
forms
impregnate
impregnated
improved
improved process
insoluble
lines
liquefaction
liquefaction conditions
liquefaction reactor
liquefaction zone
liquefied
liquid
liquid phase
normally
oxide
particulate
particulate form
phase
pores
portions
process
rank
reaction
reaction zone
reactor
reactor surfaces
remain
residue
salts
scale
significant
solids
stable
stable calcium
subbituminous
subbituminous coal
subbituminous coals
sufficient
sulfur
suppressing
surfaces
thereafter
thermally
thermally stable
treatment
zone