发明授权
- 专利标题: Process for producing hydrogen fluoride from an aqueous hydrofluorosilicic acid solution
- 专利标题(中): 从氢氟硅酸水溶液中生产氟化氢的方法
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申请号: US703519申请日: 1976-07-08
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公开(公告)号: US4067957A公开(公告)日: 1978-01-10
- 发明人: Ralph Eric Worthington , Padraic Seamus O'Neill
- 申请人: Ralph Eric Worthington , Padraic Seamus O'Neill
- 申请人地址: EI Dublin
- 专利权人: Fitzwilton Limited
- 当前专利权人: Fitzwilton Limited
- 当前专利权人地址: EI Dublin
- 优先权: EI1611/75 19750718
- 主分类号: C01B7/19
- IPC分类号: C01B7/19 ; C01B7/22
摘要:
Potassium fluoride and silica are reacted with an aqueous solution of hydrofluorosilicic acid. The resulting potassium fluorosilicate is recovered. The potassium fluorosilicate may be further reacted with ammonia in water to form an aqueous mixture of ammonium fluoride and potassium fluoride. The ammonium fluoride is then heated in aqueous solution in the presence of excess potassium fluoride to release ammonia and to form potassium bifluoride. The potassium bifluoride is recovered from solution substantially free from ammonia and heated to release hydrogen fluoride. Alternatively, the recovered potassium bifluoride may be reacted with sodium fluoride to produce sodium bifluoride. The sodium bifluoride is then heated to release hydrogen fluoride.
公开/授权文献
- US5493573A Broad band switching network 公开/授权日:1996-02-20