Process for fractional distillation

Details Process for fractional distillation Process for fractional distillation

1984-08-30

1986-07-22

Sever, Frank

Refrigeration

Processes

Circulating external gas

203 70, 208348, 585867, B01D 334, F25J 302

Patent

active

046017399

ABSTRACT:
Existing fractional distillation columns, especially those in extensive commercial use for separating the lower molecular weight hydrocarbons, are often limited in the quality of separation achievable by the heat-absorbing capacity of and/or the minimum operating temperature of their associated refrigeration equipment. The separation efficiency of such equipment can be improved by introducing an auxiliary material into the equipment to provide additional reflux volume without the need for added refrigeration capacity. The auxiliary material must be less volatile than the primary constituent(s) of the off-gas from the column, and it advantageously should also be less volatile than the majority of the bottoms stream from the column, in order to facilitate later separation.

REFERENCES:
patent: 2577617 (1951-12-01), Hudig
patent: 3262278 (1966-07-01), Thorsten et al.
patent: 3756036 (1973-09-01), Ezell
patent: 4444576 (1984-04-01), Ryan et al.

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