Gas chromatograph and method of using same

Details Gas chromatograph and method of using same Gas chromatograph and method of using same

1993-03-19

1995-02-21

Spitzer, Robert

Gas separation: processes

Chromatography

95 89, 96102, 96105, B01D 1508

Patent

active

053912217

ABSTRACT:
A gas chromatograph for operation selectably in both split mode and splitless wide bore injection mode includes a capillary column, a sample injection chamber at the inlet of the column, a three-way valve, a first piping line connected between one of the two outlets of the three-way valve and the sample injection chamber, a split line connected to the sample injection chamber immediately upstream of the inlet of the column for discharging therethrough a portion of a gas being sent out from the sample injection chamber, a second piping line connected between the other of the outlets of the three-way valve and the split line, and a third piping line connected between the first and second piping lines. By properly controlling the total carrier gas flow rate and the column inlet pressure, the split ratio can be controlled easily. By varying the split ratio appropriately during an analysis, the amount of the carrier gas to be wasted in the case of a split mode of operation can be significantly reduced.

REFERENCES:
patent: 2813010 (1957-11-01), Hutchins
patent: 3357233 (1967-12-01), Roof
patent: 3881892 (1975-05-01), Gehrke et al.
patent: 3985016 (1976-10-01), Haruki
patent: 4124358 (1978-11-01), Muller
H. Bruderreck et al., "Quantitative Gas Chromatography Analysis of Hydrocarbons with Capillary Columns and Flame Ionization Detector, IV Principle of a New Splitting System", J. of Gas Chromatography, May, 1967, pp. 217-225.

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