Process for particulate removal from coal liquids
AssigneeInternational Coal Refining Company
InventorGerald C. Rappe
Life of this patent
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Abstract
Suspended solid particulates are removed from liquefied coal products by first subjecting such products to hydroclone action for removal in the underflow of the larger size particulates, and then subjecting the overflow from said hydroclone action, comprising the residual finer particulates, to an electrostatic field in an electrofilter wherein such finer particulates are deposited in the bed of beads of dielectric material on said filter. The beads are periodically cleaned by backwashing to remove the accumulated solids.
Claims11
The method of removing suspended solid particulates contained in a liquefied coal product which consists essentially of the steps of:
- (a) subjecting said liquefied coal product as feed to a hydroclone treatment, thereby separating the said to obtain an under flow portion of substantially higher solids concentration than that of said feed and an overflow portion of lower solids concentration than that of said feed;
- said overflow portion containing at least the major part of the particles from said feed of the size range up to about 10 microns;
- (b) introducing said overflow portion into the electrostatic field of an electrofilter to deposit contained solids in said filter;
- and
- (c) discharging the solids-free liquid filtrate from said electrofilter.
Dependencies are inferred from the claim text.