Method for continuously producing a cyclic formal

Details Method for continuously producing a cyclic formal Method for continuously producing a cyclic formal

1998-01-27

1999-03-23

Richter, Johann

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

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

549431, 568724, C07D30704

Patent

active

058861980

ABSTRACT:
Cyclic formal is manufactured by cyclic reaction of an alkylene glycol and an aldehyde in a reactor, producing formal mixed with unreacted aldehyde as an impurity, which impurity is reduced in amount by connecting the reactor to a distillation tower and continuously supplying alkylene glycol to the distillation tower from which unreacted formaldehyde and a cyclic formal are being distilled, and continuously reacting them with supplied raw formaldehyde by countercurrent flow during distillation; water content in azeotropic admixture with cyclic formal can be removed by azeotropic distillation with a hydrocarbon azeotropic mixture with water, distilling water from the cyclic formal.

REFERENCES:
patent: 3857759 (1974-12-01), Fiore et al.
patent: 5456805 (1995-10-01), Thighpen
patent: 5616736 (1997-04-01), Thighpen

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