Apparatus for the cryogenic enrichment of trace substances of a

Details Apparatus for the cryogenic enrichment of trace substances of a Apparatus for the cryogenic enrichment of trace substances of a

1988-08-23

1989-12-19

Capossela, Ronald C.

Refrigeration

Low pressure cold trap process and apparatus

55269, B01D 800

Patent

active

048874345

ABSTRACT:
Samples of trace substances are cryogenically concentrated by passing a gas sample through a U-bend immersed in liquid nitrogen. The U-bend is surrounded by a chamber wall and the chamber is vented so that liquid nitrogen can rise into the chamber when the vent is open but is driven out when the vent is closed and the enrichment pipe is heated to desorb the accumulated trace substances from the adsorbent in the enrichment pipe.

REFERENCES:
patent: 3712074 (1973-01-01), Boissin
patent: 3788096 (1974-01-01), Brilloit
patent: 4506513 (1985-03-01), Max
patent: 4530250 (1985-07-01), Gay et al.
patent: 4666480 (1987-05-01), Mann
patent: 4668261 (1987-05-01), Chatzipetros et al.
patent: 4755201 (1988-07-01), Eschwey

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