Process for producing acetaldehyde dimethylacetal

Details Process for producing acetaldehyde dimethylacetal Process for producing acetaldehyde dimethylacetal

1993-04-23

1994-11-08

Mars, Howard T.

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

Organic compounds

Oxygen containing

568605, 568699, 203 68, 203 70, C07C 4156, B01D 334

Patent

active

053629183

ABSTRACT:
A process for producing acetaldehyde dimethylacetal comprising reacting acetaldehyde and methanol in the presence of an acid catalyst is disclosed, in which the reaction is carried out in a part of a rectification tower while conducting rectification to withdraw the water by-produced from the bottom of the tower and to recover a distillate containing the acetaldehyde dimethylacetal produced from the top of the tower. The distillate is subjected to azeotropic distillation in the presence of n-hexane or cyclohexane to separate methanol as an azeotrope with n-hexane or cyclohexane and a small amount of the acetaldehyde dimethylacetal and to recover high purity acetaldehyde dimethylacetal as a bottom.

REFERENCES:
patent: 1850836 (1932-03-01), Guinot
patent: 3127450 (1964-03-01), Lorette et al.
patent: 4613411 (1986-09-01), Hsu et al.
Patent Abstracts of Japan, vol. 14, No. 197 (C-712)(4140) 23 Apr. 1990.

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