Rectifier liquid generated intermediate reflux for subambient ca

Details Rectifier liquid generated intermediate reflux for subambient ca Rectifier liquid generated intermediate reflux for subambient ca

1988-05-17

1989-08-08

Capossela, Ronald C.

Refrigeration

Processes

Circulating external gas

62 28, 62 38, F25J 304

Patent

active

048549541

ABSTRACT:
The invention discloses process and apparatus for increasing the efficiency of subambient cascaded .fractional distillations such as air separation, ethane-ethylene separation, or nitrogen rejection from natural gas. The improvement provides an advantageous means of generating the optimal amount of intermediate reflux liquid for both rectifications in the cascade. Referring to FIG. 4, a latent heat exchanger (415) is provided in which a liquid from the HP rectifying section (403) of the cascade exchanges latent heat with a minor fraction of the feed gas. The condensed feed is then split by two valves (409 and 410) into respective intermediate reflux streams for both parts of the cascade (402 and 403).

REFERENCES:
patent: 2779174 (1957-01-01), Vesque
patent: 4357153 (1982-11-01), Erickson
patent: 4433989 (1984-02-01), Erickson
patent: 4533375 (1985-08-01), Erickson
patent: 4604116 (1986-08-01), Erickson
patent: 4605427 (1986-08-01), Erickson
patent: 4670031 (1987-06-01), Erickson
patent: 4705548 (1987-11-01), Agrawal et al.

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