Treatment with liquid cryogen

Details Treatment with liquid cryogen Treatment with liquid cryogen

1978-04-24

1979-08-28

Capossela, Ronald C.

Refrigeration

Processes

Treating an article

62375, 62376, 131133R, 131140A, 131140B, F25D 1702

Patent

active

041656180

ABSTRACT:
A product, such as tobacco, is introduced into a processing chamber that is coupled with a holding chamber. A cryogen vapor pressure is established in the processing chamber, and a compressor is operated to transfer liquid cryogen near equilibrium conditions by differential pressure flow from the holding chamber to the processing chamber and, after treatment, and for returning liquid cryogen by differential pressure flow back to the holding chamber. Pressure in both chambers is maintained above the saturation pressure whenever differential pressure transfer occurs. Vapor from the processing chamber is recovered in first, second and third gas receivers which are respectively interconnected by a low-pressure compressor and a high-pressure compressor. After treatment, a processing chamber is sequentially interconnected with the first receiver, then with the second gas receiver and subsequently with the third gas receiver.

REFERENCES:
patent: 3754407 (1973-08-01), Tyree, Jr.
patent: 3889488 (1975-06-01), Maeda et al.
patent: 3892104 (1975-07-01), Klee et al.
patent: 4075869 (1978-02-01), Fitsall
patent: 4086783 (1978-05-01), Wagner
patent: 4086784 (1978-05-01), Wagner

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