Process for the purification of 2-pyrrolidone

Details Process for the purification of 2-pyrrolidone Process for the purification of 2-pyrrolidone

C - Chemistry, Metallurgy

07

D

202/98

C07D 201/16 (2006.01) C07D 207/267 (2006.01)

Patent

CA 1178918

- 6 - A B S T R A C T 3199 In a distillation process pyrrolidone obtained from suc- cinonitrile is purified by treating the impure liquid pyrrolidone with a strong base, fractionally distilling this product to yield, as distillate, polymerization grade pyrrolidone, mixing the 2-pyrrolidone-containing residue from the fractional distillation with water and an acid, and extracting purified pyrrolidone from the water/acid mixture. The latter purified pyrrolidone product is suitable for recycling to the pyrrolidone synthesis or to make other products.

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