Coal deashing process having improved solvent recovery techniques

Patent · Tue Jul 31 00:00:00 EDT 1979

OSTI ID:6090949

Rhodes, D E

An improved coal deashing process wherein coal is mixed with a coal liquefaction process solvent, solubilized and flashed to provide a prepared mixture and the prepared mixture is mixed with a deashing solvent to produce a feed mixture. Thereafter, the feed mixture is separated in a first separation zone into a first heavy fraction comprising insoluble coal products and a first light fraction comprising soluble coal products and solvents. The first light fraction is recovered and a second portion of the deashing solvent is mixed with the first light fraction prior to introduction into a second separation zone wherein an improved separation occurs to produce a second light fraction comprising the solvents and a second heavy fraction comprising the soluble coal products which is recovered. The second light fraction is withdrawn and separated in a third separation zone into a third heavy fraction comprising the liquefaction process solvent for recycle to aid in solubilization of the coal and a third light fraction comprising the deashing solvent for recycle to aid in the production of the feed mixture.

• Assignee: Kerr-McGee Corp.
• Patent Number(s): US 4162956
• OSTI ID: 6090949
• Resource Relation: Patent File Date: Filed date 20 Mar 1978
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
COAL
DEASHING
ORGANIC SOLVENTS
RECYCLING
COAL LIQUEFACTION
DISSOLUTION
RECOVERY
CARBONACEOUS MATERIALS
ENERGY SOURCES
FOSSIL FUELS
FUELS
LIQUEFACTION
SOLVENTS
THERMOCHEMICAL PROCESSES
010402* - Coal
Lignite
& Peat- Purification & Upgrading
010405 - Coal
Lignite
& Peat- Hydrogenation & Liquefaction