Patent ID: 9533931
Date: 2017-01-03
CPC Classifications: B01D,C07C,C08G

Claim:
1. A process of producing 1,4-butanediol, comprising the steps of (a) adding an alkaline substance other than an ammonia or an amine to an aqueous 1,4-butanediol-containing solution originated from a fermentation broth; (b) distilling the resulting mixture of step (a); and (c) recovering a 1,4-butanediol-containing solution from vapor flow, wherein, before adding said alkaline substance, said aqueous 1,4-butanediol-containing solution originated from a fermentation broth is subjected to a step of filtering said aqueous 1,4-butanediol-containing solution through a nanofiltration membrane and recovering the aqueous 1,4-butanediol-containing solution from the permeate flow of the membrane; and/or a step of subjecting said aqueous 1,4-butanediol-containing solution to an ion exchange treatment.