| 摘要 |
<p>A gas stream including the vapor of a solvent is passed through conduit (28) into a reflux heat exchange (40) so as to effect condensation of substantially all the solvent vapor. Cryogenic liquid is introduced through line (70) into condensate of the solvent vapor collecting in bottom section (42) of the condenser to cool the condensate and to stir or agitate it (such agitation preventing local freezing). Chilled solvent condensate is withdrawn from the bottom section (42) and is returned to overhead section (43) of the heat exchanger (40) via a conduit (66) and thus serves as reflux. A further portion of the chilled solvent may be returned to the condensate so as to augment the stirring or agitation of the liquid. Condensate may be withdrawn through the conduit (50) and passed to storage.
<??>The gas stream may typically be passed first through a water-cooled heat exchanger (13) and then through a heat exchanger (23), cooled by uncondensed gas from the reflux heat exchanger (40), before entering the heat exchanger (40) so as to condense some of the solvent vapor it contains upstream of the heat exchanger (40). </p> |
