Isolation and concentration of sample prior to analysis thereof

Details Isolation and concentration of sample prior to analysis thereof Isolation and concentration of sample prior to analysis thereof

1978-11-13

1979-12-25

Adee, John

Gas separation

Means within gas stream for conducting concentrate to collector

55 67, 55197, 55208, B01D 1508

Patent

active

041803892

ABSTRACT:
A method and apparatus are described for the isolation and purification of a solute prior to carrying the solute by means of a carrier gas into analytical instruments such as gas chromatographs. The apparatus is comprised of a serial differential trapping arrangement. The method provides for increasing the ratio of solute to carrier gas in a gaseous stream containing a carrier gas and a sample comprising solute. This is accomplished by forming a first gaseous stream comprising the sample, passing the first gaseous stream into a first adsorbent-containing trap and therein trapping said solute; and, thereafter simultaneously heating and backflushing said first trap with a first carrier gas to form a second gaseous stream comprising first carrier gas and the solute. The second gaseous stream derived from the first trap is passed to a second adsorbent-containing trap and solute is trapped therein. Thereafter the second trap is simultaneously heated and backflushed with a second carrier gas to form a third gaseous stream comprising a carrier gas and solute wherein the ratio of solute to carrier gas is greater than the ratio of solute to carrier gas in the second gaseous stream.

REFERENCES:
patent: 2398818 (1946-04-01), Turner
patent: 3462918 (1969-08-01), Prosser
patent: 3626761 (1971-12-01), Hahuki et al.
patent: 3693403 (1972-09-01), Paul et al.
patent: 3847546 (1974-11-01), Paul
patent: 3955924 (1976-05-01), Northmore

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