Process and device for vaporization injections in equipments for

Details Process and device for vaporization injections in equipments for Process and device for vaporization injections in equipments for

1993-01-13

1994-09-20

Williams, Hezron E.

Measuring and testing

Gas analysis

Gas chromatography

G01N 3012

Patent

active

053478444

ABSTRACT:
The invention concerns a process and a device for splitless vaporizing injection of samples into equipments of gas chromatographic analysis.
The technique is applied specially when liquid samples generate volumes of vapors which cannot be housed inside the vaporizing chamber.
Inside the vaporisation chamber, kept at high temperature, evaporation of the sample solvent forms a cool zone where the solutes are retained while the solvent vapors expand out of the vaporizing chamber and leave the injector. The sample liquid is kept in place within the vaporization chamber by suitable obstacles or by a packing material. At the end of solvent evaporation, i.e. when cooling ceases, the injection zone returns to the regulated injector temperature and the compounds to be analysed are transferred to the column by the carrier gas.

REFERENCES:
patent: 3859209 (1975-01-01), Jahnsen et al.
patent: 4704141 (1987-11-01), Krebber
patent: 5174149 (1992-12-01), Grob et al.
Grob, "PTV Vapor Overflow--Principles of a Solvent Evaporation Technique for Introducing Large Volumes in Capillary GC", Journal of High Resolution Chromatography, pp. 540-546.
Grob et al., "PTV Splitless Injection of Sample Vol. up to 20 ul", Journal of High Resolution Chromatography & Chromatography Communications, pp. 626-632.

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