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    • 31. 发明公开
    • PROCESS FOR PREPARING CRYSTALLINE AMMONIUM SULFATE PRODUCT
    • VERFAHREN UND VORRICHTUNG ZUR HERSTELLUNG EINES KRISTALLINEN AMMONIUMSULFATPRODUKTES
    • EP2897903A1
    • 2015-07-29
    • EP13762810.3
    • 2013-09-12
    • DSM IP Assets B.V.
    • TINGE, Johan ThomasEKKELENKAMP, GeertVONK, Pieter
    • C01C1/248B01D9/00C05C3/00
    • C01C1/248B01D9/0031B01D9/0036B01D9/0063C01C1/24C05C3/005
    • The invention relates to a process for preparing a crystalline ammonium sulfate product, which process comprises: a) subjecting in a crystallizer a feed solution of ammonium sulfate to crystallization to form a first slurry of ammonium sulfate crystals; b) subjecting the first slurry of ammonium sulfate crystals to a first size classification to yield a first coarse ammonium sulfate crystal fraction and a first fine ammonium sulfate crystal fraction; c) recycling at least part of the first fine ammonium sulfate crystal fraction to the feed solution of ammonium sulfate; and d) recovering a crystalline ammonium sulfate product from the first coarse ammonium sulfate crystal fraction, characterized in that: e) a second size classification is carried out on a second slurry of ammonium sulfate crystals to yield a second coarse ammonium sulfate crystal fraction and a second fine ammonium sulfate crystal fraction.
    • 本发明涉及一种制备结晶硫酸铵产物的方法,该方法包括:a)在结晶器中使硫酸铵的进料溶液结晶以形成硫酸铵晶体的第一浆料; b)使硫酸铵晶体的第一浆料进行第一粒度分级以产生第一粗硫酸铵晶体级分和第一细小硫酸铵晶体级分; c)将至少部分第一细小硫酸铵结晶部分再循环到硫酸铵的进料溶液中; 和d)从所述第一粗硫酸铵晶体级分回收结晶硫酸铵产物,其特征在于:e)在硫酸铵晶体的第二浆料上进行二次分级,得到第二粗硫酸铵晶体级分和 第二细小的硫酸铵结晶部分。