STOLLER, VIKTOR,ERB, MICHAEL,MEESE-MARKTSCHEFFEL, JULIANE,LOHSE, MICHAEL,MARSCHALL, KLAUS-JÜRGEN,SCHRUMPF, FRANK
申请号：
EP20080708312
公开号：
EP2118017(B1)
申请日:
2008.01.29
申请国别(地区):
欧洲专利局
年份:
2016
代理人:
摘要：
The invention is directed to a process for the continuous preparation of ammonium paratungstate hydrate by back reextraction of a tungsten-laden organic phase with an ammonia-containing aqueous solution in a mixer-settler apparatus. The reextraction is carried out at an NH3:W molar ratio of from 0.83 to 1.30, and a volume feed ratio of the tungsten-laden organic phase to the ammonia-containing aqueous solution of from 5 to 25. The above crystalline is in high purity and in high yield. The production method can be carried out in a simple and energy-efficient manner.
