METHOD FOR PRODUCING AMMONIUM PARATUNGSTATE HYDRATES AND AMMONIUM PARATUNGSTATE DECAHYDRATE
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.
申请公布号
EP2118017(B1)
申请公布日期
2016.10.12
申请号
EP20080708312
申请日期
2008.01.29
申请人
H.C. STARCK GMBH
发明人
STOLLER, VIKTOR;ERB, MICHAEL;MEESE-MARKTSCHEFFEL, JULIANE;LOHSE, MICHAEL;MARSCHALL, KLAUS-JÜRGEN;SCHRUMPF, FRANK