Coal liquefaction process employing multiple recycle streams

Patent · Tue Jul 08 04:00:00 EDT 1980

OSTI ID:5039079

Carr, N; Schleppy, R; Shah, Y

A combination coal liquefaction-gasification process comprises passing hydrogen and a liquefaction zone feed slurry comprising mineral-containing feed coal, recycle dissolved liquid coal solvent, recycle dissolved coal which is solid at room temperature and recycle mineral residue to a coal liquefaction zone to dissolve hydrocarbonaceous material from mineral residue and to hydrocrack said hydrocarbonaceous material to produce a liquefaction zone effluent mixture comprising hydrocarbon gases, dissolved liquid coal, solid dissolved coal and suspended mineral residue; recycling to said liquefaction zone feed slurry a portion of said dissolved liquid coal,solid dissolved coal and mineral residue; recycling to said liquefaction zone an other portion of ssaid solid dissolved coal and mineral residue independently of said liquefaction zone feed slurry; said liquefaction zone producing a greater net yield on a weight basis after recycle of 450 to 850/sup 0/F dissolved liquid coal as compared to the net yield on a weight basis after recycle of 850/sup 0/F solid dissolved coal; separating dissolved liquid coal and hydrocarbon gases from non-recycled solid dissolved coal and mineral residue to produce a gasifier feed slurry comprising substantially the entire net yield of solid dissolved coal and mineral residue of said liquefaction zone; passing said gasifier feed slurry to a gasification zone includin G an oxidation zone for the conversion of the hydrocarbonaceous material therein to synthesis gas; converting at least a portion of said synthesis gas to a gaseous hydrogen-rich stream and passing said hydrogen-rich stream to said liquefaction zone to supply process hydrogen thereto; the amount of hydrocarbonaceous material passed to said gasification zone being sufficient to enable said gasification zone at least the entire hydrogen requirement of said liquefaction zone.

• Assignee: Gulf Research and Development Co
• Patent Number(s): US 4211631
• OSTI ID: 5039079
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
010405* -- Coal
Lignite
& Peat-- Hydrogenation & Liquefaction
010800 -- Coal
Lignite
& Peat-- Waste Management
CHEMICAL REACTIONS
COAL GASIFICATION
COAL LIQUEFACTION
CRACKING
DECOMPOSITION
DISPERSIONS
DISSOLUTION
GASIFICATION
HYDROCRACKING
LIQUEFACTION
MINERAL WASTES
MIXTURES
ORGANIC SOLVENTS
PYROLYSIS
RECYCLING
SLURRIES
SOLID WASTES
SOLVENTS
SUSPENSIONS
THERMOCHEMICAL PROCESSES
WASTES