METHOD FOR PRODUCING AMMONIUM PARATUNGSTATE HYDRATES AND AMMONIUM PARATUNGSTATE DECAHYDRATE

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 0.8...

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Main Authors LOHSE MICHAEL, STOLLER VIKTOR, ERB MICHAEL, SCHRUMPF FRANK, MARSCHALL KLAUS-JUERGEN, MEESE-MARKTSCHEFFEL JULIANE
Format Patent
LanguageEnglish
Published 22.04.2010
Subjects
CHEMISTRY
COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSESC01D OR C01F
INORGANIC CHEMISTRY
METALLURGY
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Summary: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.
Bibliography:Application Number: US20080524957