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35 条记录 (耗时 0.01 秒)

    A method of preparing chlorate
    31.
    发明公开
    A method of preparing chlorate 失效
    Verfahren zur Herstellung von Chlorat。

    公开(公告)号：EP0459961A2

    公开(公告)日：1991-12-04

    申请号：EP91850127.1

    申请日：1991-05-15

    申请人： EKA NOBEL AB

    发明人： Wide, Ann ,  Widmark, Per

    IPC分类号： C01B11/14 ,  C25B15/08 ,  C25B1/34 ,  C25B1/26

    CPC分类号： C25B15/08 ,  C01B11/14

    摘要： The invention discloses a method in the electrolytic production (1) of alkali metal chlorate which is recovered by crystallization (3) and separation (9) of the crystals from a solution recycled to the electrolysis process (1). A given proportion of the crystals formed are separated (6) and removed from the mother liquor after they have been in contact with the mother liquor for a shorter period of time than the remaining crystals, whereby they obtain a sulphate content which is higher than in the crystals that have been in contact with the mother liquor for a longer period of time.

    摘要翻译： 本发明公开了一种电解生产（1）碱金属氯酸盐的方法，其通过结晶（3）和从循环到电解过程（1）的溶液中分离（9）晶体而回收。 形成的晶体的一定比例与母液在母液接触后比其余晶体短（6）分离，并从母液中除去，由此得到的硫酸盐含量高于 与母液接触较长时间的晶体。

    Removal of chromium from cell liquor
    34.
    发明公开
    Removal of chromium from cell liquor 失效
    Entfernung von Chrom aus einerElektrolytlösung。

    公开(公告)号：EP0246871A1

    公开(公告)日：1987-11-25

    申请号：EP87304463.0

    申请日：1987-05-20

    申请人： Tenneco Canada Inc.

    发明人： Lipsztajn, Marek

    IPC分类号： C01B11/14 ,  C01G37/02 ,  C25B15/08

    CPC分类号： C01B11/145 ,  C01G37/02 ,  C01P2006/60

    摘要： Soluble hexavalent chromium values are removed from aqueous chlorate solutions by employing a critical effective ratio of OH - : Cr 2 O 7 = ions of at least 3: in the aqueous chlorate solution and by employing a dithionite to reduce the hexavalent chromium to trivalent chromium, preferably in the mole ratio of S 2 O 4 = : Cr 2 O 7 = of at least 3 1. The trivalent chromium forms chromic hydroxide (Cr(OH) 3 ) with the hydroxyl ions and precipitates from the aqueous chlorate solution. The process is rapid and effective in quantitative removal of hexavalent chromium from the aqueous chlorate solutions and is especially useful for the removal of sodium dichromate from cell liquor which is intended to be employed in chlorine dioxide production and which is produced by diaphragmless electrolysis of sodium chloride.

    摘要翻译： 通过在氯酸盐水溶液中使用至少3:1的OH-至关重要的有效比例至少为3:1，并通过使用连二亚硫酸盐将六价铬还原为三价，从氯酸水溶液中除去可溶性六价铬值 铬，优选的摩尔比为至少3:1，其中S2O4 <=>：Cr2O7 <=>的摩尔比。 三价铬与羟基离子形成氢氧化铬（Cr（OH）3），并从氯酸盐水溶液中析出。 该方法快速有效地从氯酸盐水溶液中定量除去六价铬，并且特别可用于从用于二氧化氯生产的细胞液中除去重铬酸钠，并且其通过无氯化钠电解产生 。