Direct resistive heating and temperature measurement of metal-cl

Details Direct resistive heating and temperature measurement of metal-cl Direct resistive heating and temperature measurement of metal-cl

1990-09-25

1992-05-19

Spitzer, Robert

Gas separation

Means within gas stream for conducting concentrate to collector

55 67, 55197, 55208, 55386, B01D 1508

Patent

active

051144395

ABSTRACT:
An improved system and method for high resolution gas chromatography (GC) is disclosed. This invention involves the use of fused silica open tubular capillary columns having a conductive exterior coating and an arrangement for electrically coupling a power source to such coating, whereby it is now possible to effect direct resistive heating of the capillary column while controlling the temperature thereof. Such control is achieved by measurement of the resistance of the conductive coating, correlating such resistance with the temperature of the column and increasing or decreasing the electrical power supplied to such coating, as appropriate, to effect the desired adjustment in column temperature. Because of the low thermal mass of the column and the conductive coating, temperature changes can be effected readily thereby improving the speed of such separation and reducing the time interval between resolution of successive samples. In the preferred embodiments of this invention, the system is incorporated in what is referred to as "short column" gas chromatography instrumentation and thus suitable for "non-selective" detection systems or selective detection methods. Because of the relative compact nature and low power demands of the system of this invention, such system can be operated as a portable unit.

REFERENCES:
patent: 3057183 (1962-10-01), Deford
patent: 3063286 (1962-11-01), Nerheim
patent: 3115766 (1963-12-01), Winters
patent: 3225520 (1965-12-01), Burow
patent: 3225521 (1965-12-01), Burow
patent: 3232093 (1966-02-01), Burow et al.
patent: 3514925 (1970-06-01), Bossart
patent: 3624986 (1971-12-01), Shoemake
patent: 3789190 (1974-01-01), Orosy et al.
patent: 3831555 (1974-08-01), Srinivas
patent: 4096908 (1978-06-01), Lamy
patent: 4242227 (1980-12-01), Lamparski et al.
patent: 4350586 (1982-09-01), Conlon et al.
patent: 4376641 (1983-03-01), Nestrick et al.
patent: 4474825 (1984-10-01), Schmidt
patent: 4523084 (1985-06-01), Tamura et al.
patent: 4549073 (1985-10-01), Tamura et al.
patent: 4554436 (1985-11-01), Chlosta et al.
patent: 4599095 (1986-07-01), Barnes et al.
patent: 4642154 (1987-02-01), Thalmann et al.
patent: 4650964 (1987-03-01), Vincent
patent: 4695709 (1987-09-01), Sachs et al.
patent: 4721846 (1988-01-01), Lupoli et al.
patent: 4726822 (1988-02-01), Cates et al.
patent: 4728776 (1988-03-01), Vincent
patent: 4735259 (1988-04-01), Vincent
patent: 4805441 (1989-02-01), Sides et al.
Milton L. Lee et al., Open Tubular Column Chromatography, (a Wiley-Interscience Publication, John Wiley & Sons, 1984) Chapter 4, p. 110.

Affiliated with

Also associated with

Rating

Direct resistive heating and temperature measurement of metal-cl does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Direct resistive heating and temperature measurement of metal-cl, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Direct resistive heating and temperature measurement of metal-cl will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2415291