Method for recycling a carrier gas from the trapping system to the inlet of a gas chromatographic separation unit
AssigneesSociete Nationale Elf Aquitaine, Societe de Recherches Techniques et Industrielles
InventorsReynald Bonmati, Bernard Roz, Henri Tollet de Santerre
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Abstract
During the recycling operation, the carrier gas is subjected to a pre-purification prior to the conventional purification, the flow rate and the pressure of the carrier gas being maintained at strictly constant values at the inlet of the chromatographic unit. The method is primarily applicable to low-pressure gas chromatography and permits finer separations as well as higher productivity than atmospheric-pressure chromatography.
Claims14
A method for recycling a carrier gas flowing from a gas chromatographic separation unit having an inlet and comprising a trapping system having an outlet which comprises:
- withdrawing the carrier gas from said trapping system,
- subjecting said carrier gas to a pre-purification step, then to a purification step,
- recycling gas purified in said purification step at the inlet of said chromatographic separation unit, and
- maintaining the flow rate and pressure of said carrier gas at strictly constant values at the inlet of said chromatographic unit.
A method according to any one of claims 1 to 26, wherein the chromatographic unit operates at low pressure.
Dependencies are inferred from the claim text.