Process for the recovery of dimethylacylamides

Claim 1

A process for the recovery of dimethylacylamides from mixtures containing dimethylacylamides and water formed during the production of synthetic fibers comprising: segregating low proportion dimethylacylamide and water mixtures containing up to 50% dimethylacylamide from high proportion dimethylacylamide and water mixtures containing greater than 90% dimethylacylamide, pre-concentrating the segregated low porportion mixtures which contain dimethylacylamide in amounts of up to 50% in at least one first distillation column, in which a sump product is concentrated to dimethylacylamide contents of 30 to 90% at pressures above 300 Torr and in which an overhead vapor product is formed, compressing the overhead vapor product and utilizing the latent heat of condensation of the overhead vapor product, after compression, for heating the first distillation column, and removing the sump product from the first distillation column and further distilling said sump product in a second distillation column along with nonpreconcentrated mixtures the latter which contain the high proportion of dimethylacylamides.