Recovery of methylglyoxal acetal by plural stage distillation wi

Details Recovery of methylglyoxal acetal by plural stage distillation wi Recovery of methylglyoxal acetal by plural stage distillation wi

1974-07-10

1976-05-11

Yudkoff, Norman

Distillation: processes, separatory

Plural distillations performed on same material

One a distillation under positive pressure or vacuum

203 77, 203 78, 203 79, 260615A, 260615AA, B01D 300, B01D 310, B01D 338

Patent

active

039560740

ABSTRACT:
A process for the recovery of methylglyoxal acetal from a reaction mixture which has been obtained in the reaction of acetone with an alcohol and a nitrosation agent or oxidizing agent in the presence of an acid catalyst followed by neutralization which comprises diluting the neutralized reaction mixture with such an amount of water that a homogeneous solution is formed, subsequent distillation in a first column in which a mixture of acetone, alcohol and solvent is removed overhead and returned direct to the synthesis and an azeotrope of methylglyoxal acetal, water and high-boilers is withdrawn as a side stream, condensation of the azeotrope thus obtained and separation of the phase rich in methylglyoxal acetal, subsequent distillation of the phase rich in methylglyoxal acetal thus obtained in a second column in which purified methylglyoxal acetal is withdrawn as a side stream and the overhead and bottoms products are returned with the feed to the first column, pure methylglyoxal acetal being obtained as the overhead product in a third column. Methylglyoxal acetal is suitable for the production of animal feed supplements.

REFERENCES:
patent: 2588272 (1952-03-01), Morrell et al.

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