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    Process for the purification of phosphoric acid
    7.
    发明公开
    Process for the purification of phosphoric acid 审中-公开
    ReinigungsverfahrenfürPhosphorsäure

    公开(公告)号：EP2471739A1

    公开(公告)日：2012-07-04

    申请号：EP11150103.7

    申请日：2011-01-04

    申请人： SOLVAY SA

    发明人： Verdoes, Dirk ,  van der Meer, Johannes ,  Nienoord, Michiel ,  Collard, Jean-Marie ,  Sell, Michael

    IPC分类号： C01B25/234 ,  B01D9/00

    CPC分类号： C01B25/234 ,  B01D9/0045

    摘要： Process for purifying a stream comprising phosphoric acid and a first amount of impurities, wherein
    ■ A slurry of phosphoric acid crystals in a water mother liquor is formed;
    ■ The phosphoric acid crystals are separated from the mother liquor by filtration in a wash column comprising at least one filtering element (4), while a packed bed of crystals coming from the slurry forms near said filtering element (4);
    ■ The separated phosphoric acid crystals are washed in the wash column by bringing a washing liquid in countercurrent to the crystals in the bed up to a wash front, where the washing liquid recrystallizes, the bed being subjected to a movement in the direction of said wash front (6b);
    ■ A purified stream comprising phosphoric acid and a reduced amount of impurities is formed by melting at least part of the washed crystals;
    ■ The purified stream is extracted from the wash column through a product outlet of the wash column;

    characterized in that water is introduced into said wash column (1), between the wash front (6b) and the product outlet and/or in a melting circuit (8,10,11,21) producing at least part of the washing liquid, and wherein the introduction of the said water decreases the equilibrium temperature of the contents of the melting circuit (8,10,11,21).

    摘要翻译： 纯化包含磷酸和第一量杂质的物流的方法，其中 - 形成在母液中的磷酸晶体的浆料; - 在包括至少一个过滤元件（4）的洗涤塔中通过过滤将磷酸晶体与母液分离，而来自浆料的晶体的填充床形成在所述过滤元件（4）附近; - 将分离的磷酸晶体在洗涤塔中洗涤，将洗涤液与床中的晶体逆流至清洗前，洗涤液重结晶，床沿洗涤方向移动 前面（6b）; - 通过熔化至少部分洗涤的晶体形成包含磷酸和减少量杂质的纯化物流; - 纯化的物流通过洗涤塔的产物出口从洗涤塔提取; 其特征在于，在所述洗涤塔（1）中，在所述洗涤前部（6b）和所述产品出口之间和/或在产生至少部分所述洗涤液体的熔解回路（8,10,11,21）中引入水， 并且其中所述水的引入降低了熔解回路（8,10,11,21）的内容物的平衡温度。

    Process for purifying phosphoric acid and for preparing phosphoric acid
    8.
    发明公开
    Process for purifying phosphoric acid and for preparing phosphoric acid 有权
    Verfahren zur Reinigung und zur Herstellung vonPhosphorsäure

    公开(公告)号：EP1614656A1

    公开(公告)日：2006-01-11

    申请号：EP04019216.3

    申请日：2004-08-12

    申请人： HSU, Yung Hsiung ,  HSU, Sage

    发明人： HSU, Yung Hsiung ,  HSU, Sage

    IPC分类号： C01B25/234 ,  C01B25/20 ,  C01B25/22

    CPC分类号： C01B25/234 ,  C01B25/20

    摘要： A process for purifying phosphoric acid includes removing volatile components from phosphoric acid rich in impurities to form a crude phosphoric acid liquid substantially free of volatile components; heating the crude phosphoric acid liquid to a temperature above 250° C in order to decompose phosphoric acid in the crude phosphoric acid liquid and generate gaseous phosphoric anhydride; and introducing the gaseous phosphoric anhydride into water or a dilute phosphoric acid aqueous solution in order to hydrate the gaseous phosphoric anhydride to form phosphoric acid.

    摘要翻译： 纯化磷酸的方法包括从富含杂质的磷酸中除去挥发性成分，形成基本上不含挥发性成分的粗磷酸液体; 将粗磷酸液体加热至高于250℃的温度，以分解粗磷酸液体中的磷酸并产生气态磷酸酐; 并将气态磷酸酐引入水或稀磷酸水溶液中以使气态磷酸酐水合形成磷酸。

    PROCESS FOR PRODUCTION OF PHOSPHORIC ACID BY CRYSTALLISATION OF PHOSPHORIC ACID HEMIHYDRATE
    9.
    发明公开
    PROCESS FOR PRODUCTION OF PHOSPHORIC ACID BY CRYSTALLISATION OF PHOSPHORIC ACID HEMIHYDRATE 有权
    用于生产PHOSPHORIC结晶PHOSPHORIC半水

    公开(公告)号：EP1171382A1

    公开(公告)日：2002-01-16

    申请号：EP00914207.6

    申请日：2000-03-23

    申请人： KEMIRA CHEMICALS OY

    发明人： AALTONEN, Jarmo ,  RIIHIMÄKI, Sakari ,  YLINEN, Paula ,  WECKMAN, Anders

    IPC分类号： C01B25/234

    CPC分类号： C01B25/234

    摘要： The invention relates to a process for producing simultaneously food-grade and fodder-grade phosphoric acid by crystallizing phosphoric acid hemihydrate, H3PO4 x 0.5 H2O, from a prepurified feed acid, which is purified and crystallized with the help of the following steps, a) after the step of froth-flotation of phosphate concentrate, the concentrate is directed to a strongly magnetic separation step in order to decrease the Mg ion amount, b) the phosphate concentrate is leached in a mixture of sulfuric acid and phosphoric acid according to the wet process, the precipitated SO4 and As ions are removed, and a silicon source is added in order to adjust the F/Si molar ratio to 58% P2O5, solids concentration of