发明名称 |
Process for making alkali metal phosphate solutions containing little vanadium |
摘要 |
Alkali metal phosphate solutions containing little vanadium are made from phosphoric acid containing vanadium. To this end, a negative redox potential is established in the phosphoric acid by addition of a reductant, the acid is partially neutralized and an alkali metal-phosphorus-molar ratio between 0.85 and 1.0 is established, the partial neutralization being continued over a period of at least 10 minutes. The partially neutralized acid is not filtered intermediarily and the alkali metal/phosphorus-molar ratio is increased to 1.9 to 2.1 in a second neutralization stage, collected precipitate is separated and processed, if desired.
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申请公布号 |
US4632812(A) |
申请公布日期 |
1986.12.30 |
申请号 |
US19850782700 |
申请日期 |
1985.10.01 |
申请人 |
HOECHST AKTIENGESELLSCHAFT |
发明人 |
KINNEGING, JOHANNES-WILHELMUS;ROOS, WOUTER;DAMMAN, BERNARDUS J.;JELSMA, ANDRIES;VON SCHENCK, RABAN |
分类号 |
C01B25/30;(IPC1-7):C01B25/16;C01B15/16;C01B25/26 |
主分类号 |
C01B25/30 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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