Method of separating a mixed liquid into light and heavy fractio

Details Method of separating a mixed liquid into light and heavy fractio Method of separating a mixed liquid into light and heavy fractio

1984-12-21

1986-01-28

Bascomb, Wilbur

Distillation: processes, separatory

And recovering heat by indirect heat exchange

Utilizing recovered heat for heating the distillation zone

203 14, 203 18, 203 76, 203 83, 203DIG4, 203DIG19, 203 98, B01D 314, B01D 128

Patent

active

045669473

ABSTRACT:
A two-stage distillation method for separating a mixed liquid such as a dimethylformamide-containing aqueous liquid or a methanol-containing aqueous liquid, into light and heavy fractions. The mixed liquid is first subjected to a distillation treatment in a first distillation zone of a vapor recompression type. When the boiling point of the mixed liquid is close to that of the desired light fraction, the top product from the first distillation zone is recovered as the light fraction, while the bottom product is subjected to a further distillation treatment to obtain the heavy fraction as its bottom product. When the boiling point of the mixed liquid is close to that of the heavy fraction, the bottom product from the first distillation zone is recovered as the heavy fraction, while the top product from the first distillation zone is subjected to a further distillation treatment to obtain the light fraction as its top product.

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patent: 4177111 (1979-12-01), Pieper et al.
patent: 4374705 (1983-02-01), Sawai et al.
patent: 4402795 (1983-09-01), Erickson

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