Method for the purification of raw caprolactam which contains am

Details Method for the purification of raw caprolactam which contains am Method for the purification of raw caprolactam which contains am

1980-04-24

1981-10-06

Bond, Robert T.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

C07D20116

Patent

active

042934940

ABSTRACT:
A method for purifying raw caprolactam containing, as impurities, primary amides of the formula ##STR1## R being a hydrocarbon radical having 1-14 carbon atoms, and other by-products is described. The operations, carried out in the following order, consist in (a) treating a solution of raw caprolactam in a water insoluble organic solvent with water to extract most of the caprolactam in purified form, (b) separating the aqueous caprolactam solution and isolating the caprolactam, (c) treating the remaining organic solution with mineral acid to cause the formation of two phases, (d) separating these phases into a heavy phase containing the mineral acid, dilution water and most of the amides and by-products and a light phase containing the organic solvent and any residual amides and by-products, and (e) preferably recycling the light phase to (a). Further object of the invention is the purified caprolactam thus obtained.

REFERENCES:
patent: 2758991 (1956-08-01), Kretzers et al.

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