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    • 2. 发明授权
    • Zero discharge process for preparing potassium tripolyphosphate
    • 零排放工艺制备三聚磷酸三钾
    • US4935213A
    • 1990-06-19
    • US387210
    • 1989-07-31
    • Harry E. Buckholtz
    • Harry E. Buckholtz
    • C01B25/41
    • C01B25/41
    • Disclosed is a method of making potassium tripolyphosphate by loading an ion exchange resin with either potassium or hydrogen ions and passing an aqueous solution of sodium tripolyphosphate through the resin so that the sodium ions of the sodium tripolyphosphate are exchanged with the ions loaded onto the resin, forming either potassium tripolyphosphate or tripolyphosphoric acid, respectively. The tripolyphosphoric acid is reacted with potassium hydroxide to form potassium tripolyphosphate. When the ion exchange resin becomes exhausted it is regenerated using a potassium-containing ionic solution, forming a sodium ion containing stream. The sodium ion containing stream is reacted with a phosphoric acid to form a stream of sodium phosphates.
    • 公开了通过将离子交换树脂与钾离子或氢离子负载并使三聚磷酸钠水溶液通过树脂使三聚磷酸钠的钠离子与负载在树脂上的离子交换而制备三聚磷酸钾的方法, 分别形成三聚磷酸钾或三聚磷酸。 使三聚磷酸与氢氧化钾反应形成三聚磷酸钾。 当离子交换树脂耗尽时,其使用含钾离子溶液再生,形成含钠离子的流。 含钠离子的物流与磷酸反应形成磷酸钠流。