Upgraded solvents in coal liquefaction processes
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United States of America Patent
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Aug 27, 1985
Grant Date -
N/A
app pub date -
May 13, 1982
filing date -
May 13, 1982
priority date (Note) -
Expired
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Abstract
New solvent compositions and a new two-stage direct coal liquefaction process are provided which permit control of the liquid product state from one consisting primarily of low boiling distillate to one consisting primarily of high boiling fuel oil. The use of the new solvent composition in the process significantly increases distillable liquid yields from coal or lignites. The preferred solvent contains from about 0 to 100 weight percent of pyridine-soluble bottoms, i.e., mineral matter-free normally solid dissolved coal, in which the hydrogen content is maintained at an optimum level by adding from about 0.05 to about 2.0 weight percent hydrogen in a hydrotreating step and from about 0 to 100 weight percent of a coal-derived distillate boiling below about 800.degree. F. to about 1000.degree. F.
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