Distillation: processes – separatory – Distilling to separate or remove only water – From organic compound
Patent
1995-08-01
1997-11-25
Manoharan, Virgania
Distillation: processes, separatory
Distilling to separate or remove only water
From organic compound
203 63, 203 64, 549430, B01D 334, C07D31712
Patent
active
056907931
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 extremely small amounts of water and impurities.
The purification process for cyclic formals is characterized by the steps of supplying a mixture of a cyclic formal and water into a distillation tower, effecting distillation while supplying a hydrophilic solver (A) having a boiling point from 180.degree. to 250.degree. C. and a purified cyclic formal (X) containing not more than 200 ppm of water into the distillation tower at positions higher than the supply position of the mixture and higher than the supply position of the hydrophilic solvent (A), respectively, and taking out a purified cyclic formal from the top of the tower as a distillate.
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
CA 118: 126957 Abstract.
Hoechst Celanese Corporation
Hunter, Jr. James M.
Manoharan Virgania
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