Coal liquefaction process employing multiple recycle streams

Patent · Tue Jul 08 00:00:00 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
• Resource Relation: Patent File Date: Filed date 3 Jul 1978
• Country of Publication: United States
• Language: English

Related Subjects

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