US PATENT SUBCLASS 585 / 519
.~.~.~ Removal of hydrocarbon fraction

Current as of: June, 1999
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585 /   HD   CHEMISTRY OF HYDROCARBON COMPOUNDS

500  DF  UNSATURATED COMPOUND SYNTHESIS {14}
502  DF  .~ By addition of entire unsaturated molecules, e.g., polymerization, etc. {8}
518  DF  .~.~ With preliminary treatment of feed {1}
519.~.~.~ Removal of hydrocarbon fraction

DEFINITION

Classification: 585/519

Removal of hydrocarbon fraction:

(under subclass 518) Subject matter wherein the preliminary treatment is such as to remove from the feedstock a type of hydrocarbon undesired in the polymerization reaction, e.g., a hydrocarbon of too low or too high molecular weight, of undesired molecular structure, etc.

SEE OR SEARCH THIS CLASS, SUBCLASS:

517, for such a process in which the removal mechanism is olefin polymerization.

SEE OR SEARCH CLASS

62, Refrigeration,

606+, and 617+ for extracting, per se, of a component from a mixture of gases by liquefaction and separation.