| 摘要 |
<p>1519872 Distilling alcohols RAPHAEL KATZEN ASSOCIATES INTERNATIONAL INC 19 Sept 1975 [10 Oct 1974] 38585/75 Heading B1B [Also in Division C2] A process for the distillation and purification of a crude alcohol-containing mixture wherein a feed stream containing a saturated aliphatic alcohol having not more than three carbon atoms and associated impurities is introduced into an extractive distillation tower, water is introduced into the upper portion of said extractive distillation tower, an overhead stream containing substantially all of said impurities is removed from said extractive distillation tower, a dilute aqueous stream containing 5 to 10wt.% of said alcohol is withdrawn from the bottom of said extractive distillation tower and is introduced into a lower portion of a rectifying tower, a desired alcohol product is withdrawn and recovered from the upper portion of said rectifying tower, a stripped aqueous effluent stream is withdrawn from the bottom of said rectifying tower and a part thereof is recycled to the upper portion of said extractive distillation tower; and an aqueous alkali solution is introduced into said rectifying tower between alcohol input and output points in an amount such that the concentration of said alkali in said stripped aqueous effluent stream withdrawn from the bottom of said rectifying tower and recycled to said extractive distillation tower as at least part of the water feed is from 0.10 to 0.24 gram per litre.</p> |
