×

Automated preparative gas chromatograph

  • US 5,034,193 A
  • Filed: 02/25/1988
  • Issued: 07/23/1991
  • Est. Priority Date: 02/25/1988
  • Status: Expired due to Term
First Claim
Patent Images

1. A gas chromatographic system having a gas chromatographic column system, a thermal conductivity detector, a first conduit coupled between the chromatographic column system and the thermal conductivity detector for providing a flow of system effluent from the chromatographic column system to the thermal conductivity detector, and a separation and collection system comprising:

  • a plurality of collection traps;

    a waste trap;

    a switching valve having a plurality of inlet and outlet ports;

    a stream selection valve for selectively trapping each of the various components contained in the system effluent in each one of the plurality of collection traps;

    a second conduit coupled between the switching valve and the thermal conductivity detector for providing the flow of system effluent from the thermal conductivity detector to the switching valve;

    a third conduit coupled between the switching valve and the stream selection valve for providing the flow of system effluent from the switching valve to the stream selection valve;

    a plurality of tubes operably coupled between each of the plurality of collection traps and the stream selection valve for respectively providing a flow of each of the selectively trapped components to a respective one of the plurality of collection traps;

    a waste conduit coupled between the waste trap and the switching valve;

    supply means for supplying a flushing gas from a source through one of the inlet and one of the outlet ports of the switching valve and the waste conduit to the waste trap for the prevention of the backstreaming of wastes collected in the waste trap and the contamination of the switching valve while various components of the system effluent flow through the remaining inlet and outlet ports of the switching valve to respective ones of the plurality of collection traps, said supply means including means for terminating the supply of flushing gas; and

    further supply means for alternatively flushing the separation and collection system and for supplying a liquid solvent for low volatility components from a source through the switching valve, the third conduit, the stream selection valve, and the plurality of tubes to the plurality of collection traps.

View all claims
  • 1 Assignment
Timeline View
Assignment View
    ×
    ×