US PATENT SUBCLASS 528 / 501
.~.~ With distilling or pressured reduction step to remove material, e.g., flashing, autorefrigeration, etc.

Current as of: June, 1999
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528 /   HD   SYNTHETIC RESINS OR NATURAL RUBBERS -- PART OF THE CLASS 520 SERIES

*  DD  SYNTHETIC RESINS (Class 520, Subclass 1) {23}
480  DF  .~ TREATING POLYMER CONTAINING MATERIAL OR TREATING A SOLID POLYMER OR A RESINIFIABLE INTERMEDIATE CONDENSATION PRODUCT {14}
501.~.~ With distilling or pressured reduction step to remove material, e.g., flashing, autorefrigeration, etc.

DEFINITION

Classification: 528/501

(under subclass 480) Processes wherein a polymer or polymer-containing material is exposed to a pressure decrease so as to effect a separation therein, or wherein a polymer or polymer-containing material is subjected to a distillation operation so as to effect a separation therein.

(1) Note. Included herein are processes of effecting a separation by cooling under a reduced pressure, or by partial vaporization by a sudden pressure reduction, such as by the introduction of a feed stream under pressure high enough to prevent ebullition into a zone of lesser pressure, which introduction results in the volatizing of at least a portion of the distilland.

SEE OR SEARCH THIS CLASS, SUBCLASS:

503, for a process of vaporizing material under heat without any attempt to condense the volatized component.

SEE OR SEARCH CLASS

62, Refrigeration, 9+, for processes of liquefaction wherein autorefrigeration by pressure reduction is utilized to effect separation.

159, Concentrating Evaporators, for processes of general utility for concentrating solids in solution or suspension by volatizing the liquid and note especially

2.1, for flash evaporators of general utility.

202, Distillation: Apparatus, for apparatus for carrying out distillation processes.

203, Distillation: Processes, Separatory, for processes of general utility for separation of the components of a feed mixture by distillation.

208, Mineral Oils: Processes and Products, for distillation processes wherein the comparatively pure component recovered is a mineral oil.