Purification process for cyclic formals
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United States of America Patent
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Mar 2, 1999
Issued Date -
N/A
app pub date -
Jan 18, 1996
filing date -
Jan 11, 1994
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Expired
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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.
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