Patent ID: 6521097
Filing Date: 2003-02-18
Classification: C01B,C07D

Abstract:
A process for separating hydrogen chloride from a mixture comprising an N-(C1-C18)-alkyl-2-pyrrolidone and hydrogen chloride, which comprises distilling the mixture comprising an N-(C1-C18)-alkyl-2-pyrrolidone and hydrogen chloride at from 100 to 220Â° C. and from 50 to 850 hPa in the presence of water by means of a distillation column, condensing the water as water-hydrogen chloride azeotrope at the top of the column by cooling, returning the water-hydrogen chloride azeotrope to the distillation column, separating off gaseous hydrogen chloride at the top of the column and taking off the N-(C1-C18)-alkyl-2-pyrrolidone from the bottom of the column.