发明授权
- 专利标题: Process for defluorinating alkali metal phosphate solutions
- 专利标题(中): 氟化碱金属磷酸盐溶液的方法
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申请号: US619057申请日: 1984-06-11
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公开(公告)号: US4620966A公开(公告)日: 1986-11-04
- 发明人: Gunther Schimmel , Herbert Ressel , Gero Heymer , Reinhard Gradl
- 申请人: Gunther Schimmel , Herbert Ressel , Gero Heymer , Reinhard Gradl
- 申请人地址: DEX Frankfurt
- 专利权人: Hoechst Aktiengesellschaft
- 当前专利权人: Hoechst Aktiengesellschaft
- 当前专利权人地址: DEX Frankfurt
- 优先权: DEX3322503 19830623
- 主分类号: C01B25/30
- IPC分类号: C01B25/30 ; C01B25/16
摘要:
The disclosure relates to a process for defluorinating alkali metal phosphate solutions. To this end, the disclosure provides for an alkali metal phosphate solution neutralized to a pH-value of more than 6 and pre-purified to be stirred at 60.degree. to 120.degree. C. into an alkaline earth metal compound. Alkaline earth metal compounds with a solubility in water of less than 5 g/l are used in the form of particles of which more than 50% have a size of less than 8 .mu.m. After a reaction period of 0.5 to 4 hours, the precipitate obtained is separated from the purified alkali metal phosphate solution.
公开/授权文献
- US5683810A Pourable or blowable loose-fill insulation product 公开/授权日:1997-11-04