Distillation: processes – separatory – Distilling to separate or remove only water – From organic compound
Patent
1995-08-01
1997-12-09
Manoharan, Virginia
Distillation: processes, separatory
Distilling to separate or remove only water
From organic compound
203 63, 203 64, 203 74, 203 81, 549430, B01D 334, C07D31712
Patent
active
056956150
ABSTRACT:
A purification process for cyclic formals, in which water is efficiently removed from a crude cyclic formal, namely, a mixture of a cyclic formal and water which is difficult to be separated from the mixture, thereby obtaining a cyclic formal of high purity which contains only a very small amount of water.
The purification process for cyclic formals is characterized by the following two purification steps:
(1) Supplying a mixture of a cyclic formal and water into a distillation tower at a supply position, and effecting distillation while supplying a hydrophilic solvent (A) having a boiling point from 180.degree. to 250.degree. C. at a position higher than the supply position of the mixture to take out a cyclic formal (X) containing 100 to 5000 ppm of water as a distillate, and
(2) Distilling the cyclic formal (X) obtained in step (1) or treating it with a dehydrant to obtain a purified cyclic formal (Y) which contains less water than in the cyclic formal (X).
REFERENCES:
patent: 2350940 (1944-06-01), Squires
patent: 3857759 (1974-12-01), Fiore et al.
patent: 4007095 (1977-02-01), Wolf et al.
patent: 4229262 (1980-10-01), Reed et al.
patent: 4764626 (1988-08-01), Heuvelsland
patent: 5616736 (1997-04-01), Thigpen
CA 118: 126957 Abstract.
Hoechst Celanese Corporation
Hunter, Jr. James M.
Manoharan Virginia
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