申请人:Shin-Etsu Chemical Co., Ltd.
公开号:EP3572408A1
公开(公告)日:2019-11-27
The present invention is a method for purifying an NCA, including the steps of: a) dissolving an NCA contaminated with impurities into a solvent which is a good solvent and is not a chlorinated solvent followed by stirring to precipitate an undissolved impurity to afford a suspension, b) adding an acidic filter aid having ability to trap a basic impurity to the obtained suspension followed by filtration and/or forming a fixed bed of the acidic filter aid having ability to trap a basic impurity followed by filtering the suspension to bring the suspension to be in contact with the acidic filter aid having ability to trap a basic impurity, and c) adding the obtained filtrate dropwise to a poor solvent for NCA to crystallize out the NCA in which the impurities are removed. This makes it possible to purify a low-purity NCA conveniently to afford a high-purity NCA.
本发明是一种纯化 NCA 的方法,包括以下步骤:a) 将被杂质污染的 NCA 溶解到一种溶剂中,该溶剂是一种良好的溶剂,且不是氯化溶剂,然后进行搅拌,使未溶解的杂质沉淀下来,得到一种悬浮液、b) 在得到的悬浮液中加入具有捕集碱性杂质能力的酸性助滤剂,然后过滤和/或将具有捕集碱性杂质能力的酸性助滤剂形成固定床,然后过滤悬浮液,使悬浮液与具有捕集碱性杂质能力的酸性助滤剂接触,以及 c) 将得到的滤液滴加到 NCA 的劣质溶剂中,结晶出去除杂质的 NCA。这样就可以方便地提纯低纯 NCA,得到高纯 NCA。