Patent ID: 9309205
Filing Date: 2016-04-12
CPC Classification: C07D

Claim Text:
1. A process for removing impurities from a liquid azole heteroaromatic compound-containing mixture, which comprises the following steps: (a) providing a liquid azole heteroaromatic compound-containing mixture comprising impurities; and having a PH of at least about 9; and (b) passing the azole heteroaromatic compound-containing mixture of step (a) in a cross-flow manner through at least one filtration membrane selected from the group consisting of nanofiltration and ultrafiltration membranes and having a molecular pore size in the range of from about 200 daltons to about 1 kilodalton to provide a permeate comprising an at least partially purified azole heteroaromatic compound-containing mixture and a retentate comprising at least some impurities.