Coal liquefaction with subsequent bottoms pyrolysis

Patent · 31 December 1977

OSTI ID:863059

Walchuk, George P ^[1]

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1. Queens, NY

In a coal liquefaction process wherein heavy bottoms produced in a liquefaction zone are upgraded by coking or a similar pyrolysis step, pyrolysis liquids boiling in excess of about 1000.degree. F. are further reacted with molecular hydrogen in a reaction zone external of the liquefaction zone, the resulting effluent is fractionated to produce one or more distillate fractions and a bottoms fraction, a portion of this bottoms fraction is recycled to the reaction zone, and the remaining portion of the bottoms fraction is recycled to the pyrolysis step.

• Assignee: Exxon Research & Engineering Co. (Linden, NJ)
• Patent Number(s): US 4085031
• OSTI ID: 863059
• Country of Publication: United States
• Language: English

Related Subjects

/201/208/
1000
boiling
bottoms
bottoms fraction
coal
coal liquefaction
coking
degree
distillate
distillate fraction
distillate fractions
effluent
excess
external
fraction
fractionated
fractions
heavy
heavy bottoms
hydrogen
liquefaction
liquefaction process
liquefaction zone
liquids
liquids boiling
molecular
molecular hydrogen
portion
process
produce
produced
pyrolysis
pyrolysis step
reacted
reaction
reaction zone
recycled
remaining
remaining portion
resulting
similar
step
subsequent
upgraded
zone