| 摘要 |
Chilled liquid solvent is pumped from a solvent reservoir at the bottom of a tower to an upper portion thereof and thereafter trickles through the tower by gravity and causes upward flowing solvent vapor to be condensed and recovered in the reservoir. The elimination of the use of heat exchangers is effected by introducing liquid nitrogen directly into the liquid solvent reservoir, chilling the solvent to extremely low temperatures. Agitation of the liquid solvent, which is chilled by the boiling liquid nitrogen therein, is employed to eliminate potential icing clogging problems.
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