发明名称 |
Spheroidal alkali metal polyphosphates of low apparent density, and process for making them |
摘要 |
Alkali metal polyphosphates consisting substantially of hollow spheroidal particles with an apparent density of less than 350 g/l are made. To this end, an alkali metal orthophosphate solution is forced under a pressure of 6-40 bars into a fluidization zone; the orthophosphate solution is fluidized in the fluidization zone by injecting a finely dispersed permanent gas maintained under a pressure higher than the orthophosphate solution; and the fluidized orthophosphate solution is sprayed with the aid of a plurality of single medium nozzles arranged downstream of the fluidization zone through a flame zone peoduced inside the spray tower. Apparatus for carrying out the process.
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申请公布号 |
US4721608(A) |
申请公布日期 |
1988.01.26 |
申请号 |
US19860847485 |
申请日期 |
1986.04.03 |
申请人 |
HOECHST AG |
发明人 |
KOWALSKI, WERNER;HAAS, HANS;DAHMEN, THEO;ERPENBACH, MARKUS |
分类号 |
B01D1/18;C01B25/41;(IPC1-7):C01B15/16;C01B25/26 |
主分类号 |
B01D1/18 |
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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