Process for the purification of N,N-dimethylacetamide

Details Process for the purification of N,N-dimethylacetamide Process for the purification of N,N-dimethylacetamide

1974-10-08

1976-05-25

Tayman, Jr., James H.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

203 67, 203 69, 260561R, 203 37, B01D 334, C07C10204, C07C10334

Patent

active

039593711

ABSTRACT:
The present invention relates to the recovery of N,N-dimethylacetamide from a mixture containing N,N-dimethylacetamide and acetic acid. Potassium hydroxide is added to the mixture to neutralize the acetic acid and form potassium acetate having a low solubility in N,N-dimethylacetamide and a high affinity for water. The water concentration is adjusted to a desired range and a water non-solvent such as benzene is added to effect separation of an aqueous solution of potassium acetate from the dimethylacetamide as two distinct phases. The phases are then separated and the dimethylacetamide removed from the solvent phase by distillation.

REFERENCES:
patent: 2156642 (1939-05-01), Slagh
patent: 2953503 (1960-09-01), Freure

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