Process for the separation of methanol from mixtures of tetrahyd

Details Process for the separation of methanol from mixtures of tetrahyd Process for the separation of methanol from mixtures of tetrahyd

1980-07-10

1982-06-01

Bascomb, Jr., Wilbur L.

Distillation: processes, separatory

Plural distillations performed on same material

One a distillation under positive pressure or vacuum

203 14, 203DIG19, 549429, B01D 300, C07D30700

Patent

active

043326455

ABSTRACT:
A process for the continuous separation of methanol and water from a feed mixture containing predominantly tetrahydrofuran admixed with water, methanol and small amounts of additional compounds, in a rectifying apparatus having at last two rectifying columns, of which two are operated at different pressures which involves feeding the raw material into a first column operated under lower pressure, and introducing the distillate from the column operated under a lower pressure to a second column operated under a higher pressure, while a product stream from the second column operated under a higher pressure is reintroduced into the first column operated under a lower pressure. In this process the product stream withdrawn from the second column operated under a higher pressure is withdrawn as a side stream from the stripping or enrichment section of the second column and is returned into the first column operated under a lower pressure, while a methanol-enriched product stream containing practically all of the methanol introduced with the raw material into the rectifying apparatus is withdrawn from the head of the second column operated under a higher pressure. The first column is operated for example at atmospheric pressure and the second column is operated at a pressure of from 1 to 25 bar.

REFERENCES:
patent: 3219547 (1965-11-01), Wheeler
patent: 4093633 (1978-06-01), Tanabe et al.
patent: 4175009 (1979-11-01), Copelin

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