发明授权
- 专利标题: Process for producing ammonium paratungstate
- 专利标题(中): 生产仲钨酸铵的方法
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申请号: US697662申请日: 1985-02-04
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公开(公告)号: US4624844A公开(公告)日: 1986-11-25
- 发明人: Richard A. Scheithauer , Clarence D. Vanderpool , Martin B. MacInnis , Michael J. Miller
- 申请人: Richard A. Scheithauer , Clarence D. Vanderpool , Martin B. MacInnis , Michael J. Miller
- 申请人地址: CT Stamford
- 专利权人: GTE Products Corporation
- 当前专利权人: GTE Products Corporation
- 当前专利权人地址: CT Stamford
- 主分类号: C01G41/00
- IPC分类号: C01G41/00
摘要:
A process is disclosed for producing ammonium paratungstate which involves adding hexamethylenetetramine to a first solution of ammonium tungstate, adjusting the pH to about 2 with an acid to form a precipitate which contains the major portion of the tungsten and the hexamethylenetetramine and separating the precipitate from the resulting mother liquor. The tungsten hexamethylenetetramine precipitate is then dissolved in aqueous ammonia to form a second ammonium tungstate solution which is then heated at from about 90.degree. C. to about 100.degree. C. to form a precipitate essentially all of which is ammonium paratungstate and a mother liquor which contains essentially all of the hexamethylenetetramine. The ammonium paratungstate precipitate is then separated from the mother liquor.
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