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    Process for the manufacture of madrell{40 s salt
    4.
    发明授权
    Process for the manufacture of madrell{40 s salt 失效
    制造MADRELL（40 S盐）的方法

    公开(公告)号：US3652205A

    公开(公告)日：1972-03-28

    申请号：US3652205D

    申请日：1968-06-06

    Applicant: KNAPSACK AG

    Inventor： KERN WINFRIED ,  HEYMER GERO ,  HARNISCH HEINZ

    IPC: C01B25/445 ,  C01B25/30

    CPC classification number: C01B25/445

    Abstract: Production of Maddrell''s salt by heating feed material consisting of monobasic sodium phosphate to a temperature substantially of 450* C., comprising carrying out the heating step in the temperature range between 200* and 450* C. while maintaining in the feed material a steam partial pressure between 50 and 450 mm. mercury.

    Abstract translation: 通过将由磷酸二氢钠组成的原料加热到基本上为450℃的温度来生产马德雷尔的盐，包括在200至450℃的温度范围内进行加热步骤，同时在进料中保持蒸汽部分 压力在50到450毫米之间。 汞。

    PROCESS FOR THE MANUFACTURE OF ALKALI METAL PHOSPHATES OF LOW VANADIUM CONTENT
    7.
    发明专利
    PROCESS FOR THE MANUFACTURE OF ALKALI METAL PHOSPHATES OF LOW VANADIUM CONTENT 未知

    公开(公告)号：GB1267853A

    公开(公告)日：1972-03-22

    申请号：GB3576769

    申请日：1969-07-16

    Applicant: KNAPSACK AG

    Inventor： KERN WINFRIED ,  WEIZENKORN HORST-HEINRICH

    IPC: C01B25/39

    Abstract: 1,267,853. Alkali metal phosphates. KNAPSACK A.G. 16 July, 1969, No. 35767/69. Heading C1A. In a process of making alkali metal phosphates by neutralizing crude vanadium-containing wetprocess phosphoric acids, containing up to 1000 p.p.m. of vanadium, based on P 2 O 5 , at least 0À3 g./100 g. dissolved P 2 O 5 of the Fe(III) contained in the acids is reduced to Fe(II) by alkali metal and/or alkaline earth metal sulphide. The acids are then neutralized by an alkali metal hydroxide or carbonate to a pH above 4À5, precipitated impurities, e.g. Fe, Al, and Ca phosphates containing vanadium are filtered off, and alkali metal phosphates are separated from the filtrate. The resulting phosphate contains less than 10 p.p.m. (based on P 2 O 5 ) of vanadium. A preferred reducing agent is barium sulphide, which precipitates sulphate and arsenic in addition to reducing trivalent iron. The reducing agents are preferably used in an amount more than 5 times that stoichiometrically required to reduce the Fe 3+ . Alkali metal phosphates containing less than 2 p.p.m. vanadium are obtainable if the amount of Fe(III) reduced is more than 0À8 g./100 g. P 2 O 5 . Sodium phosphate is exemplified.

    PROCESS FOR THE PREPARATION OF ALKALI METAL PHOSPHATE SOLUTIONS HAVING A REDUCED MANGANESE CONTENT
    10.
    发明专利
    PROCESS FOR THE PREPARATION OF ALKALI METAL PHOSPHATE SOLUTIONS HAVING A REDUCED MANGANESE CONTENT 未知

    公开(公告)号：GB1268124A

    公开(公告)日：1972-03-22

    申请号：GB5714769

    申请日：1969-11-21

    Applicant: KNAPSACK AG

    Inventor： HARTLAPP GERHARD ,  KERN WINFRIED ,  RESSEL HERBERT

    IPC: C01B25/22 ,  C01B25/234 ,  C01B25/30

    Abstract: 1,268,124. Purifying phosphoric acids or phosphates. KNAPSACK A.G. 21 Nov., 1969 [30 Nov., 1968], No. 57147/69. Heading C1A. Manganese is removed from phosphoric acids or acid alkali metal phosphate solutions, containing between 100 and 1000 p.p.m. by wt. manganese, based on P 2 O 5 , by establishing in the solution a concentration of magnesium, calcium or iron (II) cations of more than 2000 p.p.m. by wt., based on P 2 O 5 , neutralizing the acid solution with an alkali metal base, so as to establish an alkali metal oxide to P 2 O 5 molar ratio of more than 1À9, and filtering off the resulting precipitate to leave an alkali metal phosphate solution. The cations may be added in the form of MgSO 4 , CaCl 2 or FeSO 4 . Trivalent iron cations present in the solution may be reduced to the bivalent cation, by, for instance, hydrogen sulphide, or compounds yielding hydrogen sulphide such as sodium or barium sulphide.

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