.~.~ With fractional or linear desorption, e.g., chromatography, etc.
DEFINITION
Classification: 585/825
With fractional or linear desorption, e.g., chromatography, etc.:
(under subclass 820) Subject matter in which a desorption step removes only part of the sorbate from the sorbent or in which during at least the desorption step the sorbent material is held in a relatively fixed arrangement and the desorption creates a more or less distinct boundary or "front" between that part of the sorbent mass which still contains sorbate and that part of the sorbent mass from which sorbate has been wholly or partially removed.
(1) Note. The process may be one in which a plurality of different materials are adsorbed and the desorption serves to remove only one or a selected group of the materials or serves to remove different materials at different times, usually due to a change in desorption conditions, e.g., the desorbing agent employed, etc.
(2) Note. A purge of unsorbed material from the interstices between sorbent particles is not considered to be
desorption.
(3) Note. A chromatos:graphic process, wherein a solution of the hydrocarbon which is to be separated or purified is allowed to flow slowly through a mass of adsorbent and different substances in the feed solution pass with different rates through the mass and separate into zones, is not included in this subclass unless the desorption is such as to permit separate recovery of the different substances.
SEE OR SEARCH CLASS
73, Measuring and Testing,
23.35, for gas analysis by chromatography; and subclass 863 for gas samplers. 210, Liquid Purification or Separation,
656, for chromatos:graphic separation processes of general utility or directed to water purification.
