US PATENT SUBCLASS 95 / 82
CHROMATOGRAPHY

Current as of: June, 1999
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95 /   HD   GAS SEPARATION: PROCESSES

82CHROMATOGRAPHY {7}
83  DF  .~> Liquid supported on surface of capillary column
84  DF  .~> Liquid supported on particulate packing
85  DF  .~> Including use of gas flow distributor in column
86  DF  .~> Plural separate columns
87  DF  .~> With heating or cooling
88  DF  .~> Specific column packing or sorbent material (e.g., particle size, composition, etc.)
89  DF  .~> Injection, per se, without separation

DEFINITION

Classification: 95/82

CHROMATOGRAPHY:

(under the class definition) Process in which (a) the plurality of gases to be separated enters a column to contact a liquid, known as the "stationary liquid phase," supported by a base of solid material to successively sorb therein the different gases of the mixture or (b) the plurality of gases to be separated enters a column to contact a solid sorbent to successively sorb thereon the different gases of the mixture with or without subsequently successively eluting or displacing the sorbed gases in (a) or (b) with a gas which is inert with respect to the sorbed gases and sorbent; and subcombinations of the processes in (a) and (b) that do not result in separation when the subcombinations are not provided for elsewhere.

(1) Note. The plurality of gases is usually allowed to flow slowly through a column of particulate sorbent. Different gases will pass at different speeds through the column and will eventually be separated into zones. The zones can be eluted by passing an inert gas through the column and collecting the various fractions.

(2) Note. When a liquid is supported by a base of solid material for the separation of the mixture of gases, the process is known as "gas-liquid chromatography" or "GLC." If liquid is not present, the process is known as "gas-solid chromatography." Other phrases used when referring to

chromatography are "gas-chromatography" or "GC," "vapor-phase chromatography" or "VPC," "gas-liquid partition chromatography," "vapor fractometry," "capillary column gas chromatography" or "CC-GC," and "partition chromatography."

(3) Note. Sometimes a "carrier" gas is mixed with or used to propel the plurality of gases to be separated through the chromatography column.

(4) Note. The plurality of gases to be separated may be obtained by vaporizing a liquid. The liquid that is injected into the chromatography column is vaporized, and then the resulting vapors are separated in the chromatography column.

SEE OR SEARCH THIS CLASS, SUBCLASS:

245+, and 263+, for processes of separating gases from liquids by contacting the liquid with a gas. SEE OR SEARCH CLASS

73, Measuring and Testing,

19.02, 23.22+, and 23.35+ for chromatography including analysis of eluted or displaced gas.

96, Gas Separation: Apparatus,

101+, for gas chromatography apparatus.

210, Liquid Purification or Separation,

656+, and 198.2+ for processes and apparatus of liquid purification or separation involving chromatography.

436, Chemistry: Analytical and Immunological Testing,

161+, for processes which involve a chemical reaction for analytical testing including chromatography and for processes of analysis of the chemical properties of a sample including chromatography.