Gas chromatograph

Details Gas chromatograph Gas chromatograph

1994-12-12

1995-11-21

Williams, Hezron E.

Measuring and testing

Gas analysis

Gas chromatography

73 23420, 95 19, 422 89, 422 99, B01D 1508, G01N 3088

Patent

active

054676355

ABSTRACT:
A target pressure is calculated by a fluid dynamic theory using a length of the column, an inner diameter of the column and the temperature of the column so that the linear velocity of the gas flowing through the column is at a preset pre-determined value at which the HETP (height equivalent to a theoretical plate) value, as calculated from chemical kinematic theory, is the minimum and the resolution of the column is the highest. Then the pressure of the gas at the entrance of the column of a chromatograph is maintained at the calculated target pressure while the temperature of the column is raised to reduce the analyzing time.

REFERENCES:
patent: 3171274 (1965-03-01), Loyd
patent: 3798973 (1974-03-01), Estey
patent: 4035168 (1977-07-01), Jennings
patent: 4230464 (1980-10-01), Bonmati et al.
patent: 4976750 (1990-12-01), Munari
patent: 4994096 (1991-02-01), Klein et al.
patent: 5108466 (1992-04-01), Klein et al.
patent: 5339673 (1994-08-01), Nakagawa et al.

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