Purification process for cyclic formals

Details Purification process for cyclic formals Purification process for cyclic formals

1996-01-18

1999-03-02

Manoharan, Virginia

Distillation: processes, separatory

Adding material to distilland except water or steam per se

Organic compound

203 64, 549430, B01D 334, C07D31712

Patent

active

058765700

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 steps of supplying a mixture of a cyclic formal and water into a distillation tower, effecting distillation while supplying a hydrophilic solvent (A) having a boiling point from 180.degree. to 250.degree. C. into the distillation tower at a position higher than the supply position of the mixture, and taking out a purified cyclic formal as a distillate.

REFERENCES:
patent: 2350940 (1944-06-01), Squires
patent: 4007095 (1977-02-01), Wolf et al.
patent: 4254246 (1981-03-01), Dicoi et al.
patent: 4801358 (1989-01-01), Berg et al.
patent: 4806209 (1989-02-01), Berg et al.
patent: 5254744 (1993-10-01), Neumer

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