Method for recycling a carrier gas from the trapping system to the inlet of a gas chromatographic separation unit

US4230464A · kind A · utility

Assignees

• Societe Nationale Elf Aquitaine · FR
• Societe de Recherche Techniques et Industrielles (SRTI) · FR

Inventors

• Reynald Bonmati · New York, US
• Bernard Roz · Les Ulis, FR
• Henri Tollet de Santerre · Val-de-Reuil, FR

Key dates

• Filing date: Dec 13, 1978
• Grant date: Oct 28, 1980
• Expiry date: Dec 13, 1998

Classification

• Technology area (CPC G): Physics
• CPC primary: G01N30/32
• WIPO field: Measurement
• WIPO sector: Instruments

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.