US PATENT SUBCLASS 528 / 482
.~.~ Contacting with ion exchange material or solid sorbent

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}
482.~.~ Contacting with ion exchange material or solid sorbent

DEFINITION

Classification: 528/482

(under subclass 480) Processes wherein a solid sorbent mass is used to retain on its surface a constituent of a mixture, or wherein an ion-exchange material is used to contact the polymer or polymer-containing material.

(1) Note.

(A)

A solid sorbent is a material which separates a constituent from a fluid mixture containing such constitutents in a "quasi chemical" manner. The action in most instances is that of selective retention (e.g., the sorbent removes only

the part of the fluid mixture for which it has the greatest affinity). The retained portion cannot be removed by mechanical action but generally requires heating or use of a stripping or denuding fluid.

(B)

A filter is not proper herein since a filter has no particular "chemical" affinity for a constituent of the fluid mixture. The separation in the case of a filter depends upon a mechanical entrapment of the solid particles because of their relatively large size compared to the interstices or spaces between individual elements of the filter. In the case of a filter, mechanical brushing, wiping, shaping, etc., will remove the retained particles. (2) Note. Solid sorbent includes but is not limited to diatomaceous earth, kieselguhr, perlite, activated carbon, asbestor, colloidal clays, molecular sieves, etc.

(3) Note. Ion exchange is a process in which ions are chemically transferred from a material to a liquid or solid separatory substance or exchanger which, because of its chemical structure of loosely bound ions, has an affinity for certain ions and gives up some of its own ions to the material. The exchange occurs between ions of like charge; the exchanger substance can usually be regenerated by passing another material through it to elute the previously sorbed ions and replace them with the original kind of loosely bounds ions. These ions exchanger substances are usually solid resins.

SEE OR SEARCH CLASS

95, Gas Separation: Processes,

90+, for processes of gas separation using solid sorbents.

203, Distillation: Processes, Separatory,

41, for a separatory distillation process including the step of passing the produced vapor through a solid sorbent.

210, Liquid Purification or Separation,

660+, for liquid purification by ion exchange or sorption.