Gas separation – Means within gas stream for conducting concentrate to collector
Patent
1982-01-26
1983-12-27
Adee, John
Gas separation
Means within gas stream for conducting concentrate to collector
55197, B01D 1508
Patent
active
044228600
ABSTRACT:
Apparatus and method for injection of samples directly onto a column in a gas chromatograph with injection occurring in a temperature controlled zone outside the oven. The apparatus combines a guide means and valve assembly in alignment with an injection and thermal transfer assembly. In the guide means and valve assembly a radial seal engages the injection means to seal the injection volume, thereby eliminating back flash. In the injection and thermal transfer assembly the capillary column is centered and held in fixed position within a duct means. Means is provided to lower the temperature of the capillary column to a temperature below the vaporization temperature of the liquid sample prior to injection. After injection, means is further provided to raise the temperature of the capillary column to a temperature above the volatilization temperature of the liquid sample to vaporize it and pass it into the capillary column.
The method of on-column injection of the present invention comprises inserting an injection means through a radial seal means to a point just above a valve, opening the valve, further inserting the injection means through the valve and into the end of that portion of the capillary column within the thermal transfer assembly and outside the oven of the gas chromatograph, injecting a liquid sample into the end of the capillary column while maintaining the column at temperature below the vaporization temperature of said liquid sample, withdrawing the injection means from the capillary column and the valve means, closing the valve means, withdrawing the injection means through the injector duct and the radial seal means, and heating said column within said temperature controlled zone to volatilize said sample and pass it into said column.
REFERENCES:
patent: 3920420 (1975-11-01), Valentin et al.
patent: 4035168 (1977-07-01), Jennings
patent: 4168235 (1979-09-01), Guillemin et al.
patent: 4269608 (1981-05-01), Sisti et al.
patent: 4274480 (1981-07-01), McGee
patent: 4356733 (1982-11-01), Braunweiler
M. Galli, et al., "Special Cooling System for the On-Column Injector in Capillary Gas Chromatography Eliminating Discrimination of Sample Compounds", J. High Res. Chrom. & Chrom. Communications, 2 366 (1979).
C. A. Cramers et al., "Direct Sample Introduction System for Capillary Columns", J. of Gas Chromatography, 6 577 (1968).
K. Grob, et al., "On-Column Injection on to Glass Capillary Columns", J. of Chromatography, 151 311 (1978).
K. Grob, Jr., "Factors Affecting the Accuracy and Precision of Cold on-Column Injections in Capillary Gas Chromatography", J. of Chromatography, 189 109 (1980).
K. Grob, "On-Column Injection onto Capillary Columns", Part 2, J. High Res. Chrom. & Chrom. Comm., p. 263 (Nov. 1978).
Adee John
Cole Stanley Z.
Fisher Gerald M.
Varian Associates Inc.
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