Method of preparing cyclic formals

Details Method of preparing cyclic formals Method of preparing cyclic formals

1994-02-04

1997-04-01

Trinh, Ba K.

Organic compounds -- part of the class 532-570 series

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

C07D31710, C07D31712

Patent

active

056167369

ABSTRACT:
A method of preparing cyclic formals which contain only small amounts of by-product impurities and unreacted starting materials, and which are ready to be purified.
In preparing a cyclic formal by reacting alkylene glycol with formaldehyde in the presence of a catalyst, a reaction vessel provided with a vapor-liquid contact zone at the upper part thereof is used. Vapor generated from the reaction mixture and containing a cyclic formal goes up and passes through the vapor-liquid contact zone to be condensed. While part of the condensate is returned to the vapor-liquid contact zone, the remainder of the condensate is taken out as a distillate.

REFERENCES:
patent: 3857759 (1974-12-01), Fiore et al.
Levenspiel, Octve., "Chemical Reaction Engineering," 2.sup.nd ed, pp. 144-145, 1972, John Wiley & Sons.

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