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    • 25. 发明申请
    • Production of two alkali metal salts by a combined ion exchange and crystallisation process
    • 通过组合的离子交换和结晶过程生产两种碱金属盐
    • US20030133862A1
    • 2003-07-17
    • US10148569
    • 2002-08-13
    • Flemming Mathiesen
    • C01D009/00
    • C01D9/00C01B25/30
    • The invention relates a process for producing an alkali metal nitrate and an alkali metal phosphate in the same process from a phosphate raw material and a nitrate raw material comprising the steps of: a) reacting the phosphate raw material with the nitrate raw material to provide an aqueous nitrophosphate feed, optionally followed by the separation of solid material, b) introducing the aqueous nitrophosphate feed into a first ion exchange step comprising an alkali metal-loaded cationic exchange resin for exchanging cations present in the feed with alkali metal ions present on the resin to obtain a stream enriched in alkali metal ions, c) subjecting the stream from step (b) to a first crystallisation under such conditions that an alkali metal nitrate is crystallised and separating the crystallised alkali metal nitrate from the mother liquor, d) introducing the mother liquor from step (c) into a second ion exchange step comprising an alkali metal-loaded cationic exchange resin for exchanging cations present in the mother liquor with alkali metal ions present on the resin to obtain a phosphate containing stream enriched in alkali metal ions, and e) subjecting the stream from step (d) to a second crystallisation under such conditions that an alkali metal phoshate is crystallised and separating the crystallised alkali metal phosphate from the mother liquor.
    • 本发明涉及一种由磷酸盐原料和硝酸盐原料制备碱金属硝酸盐和碱金属磷酸盐的方法,包括以下步骤:a)使磷酸盐原料与硝酸盐原料反应, 任选地随后分离固体材料,b)将硝酸磷酸盐进料引入包含负载碱金属的阳离子交换树脂的第一离子交换步骤中,用于与存在于树脂上的碱金属离子交换进料中存在的阳离子 以获得富含碱金属离子的物流,c)使得步骤(b)的物流在使碱金属硝酸盐结晶并将结晶的碱金属硝酸盐与母液分离的条件下进行第一次结晶,d)引入 步骤(c)的母液进入包含负载碱金属的阳离子交换树脂的第二离子交换步骤 存在于母液中的阳离子存在于树脂上的碱金属离子,以获得富含碱金属离子的含磷酸盐物流,以及e)使步骤(d)的料流在如下条件下进行第二次结晶:在碱金属磷酸盐 使结晶的碱金属磷酸盐与母液分离。