Method of thawing a cryogenic unit

Details Method of thawing a cryogenic unit Method of thawing a cryogenic unit

2006-05-16

2006-05-16

Griffin, Walter D. (Department: 1764)

Refrigeration

Cryogenic treatment of gas or gas mixture

Separation of gas mixture

C062S081000, C062S282000, C062S620000, C062S630000, C062S632000, C165S095000

Reexamination Certificate

active

07043938

ABSTRACT:
A method for thawing and removing frozen material from a cryogenic separation unit such as that found in an olefin production plant comprising employing a flushing agent to thaw and remove the frozen material, purging the flushing agent with a gas, and removing residual flushing agent with a solvent that is miscible with the flushing agent and has a freezing temperature substantially lower than the flushing agent.

REFERENCES:
patent: 5456084 (1995-10-01), Lee
patent: 5730209 (1998-03-01), Sunder et al.
patent: 5921092 (1999-07-01), Behr et al.
patent: 5937656 (1999-08-01), Cheng et al.

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