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    Composition for producing ferrous dithionite and process for removing dissolved heavy metals from water
    2.
    发明公开
    Composition for producing ferrous dithionite and process for removing dissolved heavy metals from water 失效
    组合物用于生产铁 - 连二亚硫酸盐和方法的用于除去溶解在水中的重金属。

    公开(公告)号：EP0508676A2

    公开(公告)日：1992-10-14

    申请号：EP92302883.1

    申请日：1992-04-02

    申请人： ROMAR TECHNOLOGIES INCORPORATED

    发明人： Guess, Robert G.

    IPC分类号： C01B17/66 ,  C01G49/00 ,  C02F1/62

    CPC分类号： C02F1/5236 ,  C02F1/66 ,  C02F1/683 ,  Y10S204/13 ,  Y10S210/912 ,  Y10S210/913 ,  Y10S210/914

    摘要： A pumpable composition for adding to an acidic medium for producing ferrous dithionite in said acidic medium, which comprises an alkaline slurry of iron particles, hydrated crystalts of an alkali metal sulfite, and an alkaline aqueous saturated solution of said alkali metal sulfite and an alkali metal hydroxide, having a pH between 9 and 12, wherein the molar ration of said sulfite to iron contained is between 0.1 and 10. A process for removing dissolved heavy metal from an aqueous solution containing said heavy metal which comprises admixing said solution with a source of ferrous and dithionite ion in solution at a pH between 1 and 7 to effect precipitation of said heavy metal and recovering said precipitated heavy metal.

    摘要翻译： 用于添加到酸性介质，用于在所述酸性介质中，铁颗粒，碱金属亚硫酸盐的水合crystalts的碱性浆液的方法，包括生产亚铁连二亚硫酸盐，和至碱性wässrige所述的碱金属亚硫酸盐的饱和溶液和碱金属的泵能够组合物 氢氧化物，具有9至12之间的pH，worin说亚硫酸盐的摩尔比，以铁含有在0.1和10的方法之间，用于从wässrige溶液除去溶解的重金属含有所述重金属，其与源包括混合所述溶液 亚铁和在1和7之间的pH值在溶液连二离子以实现所说的重金属的沉淀和回收所述沉淀重金属。

    Process for producing high purity solutions of alkali metal hydrosulfites
    3.
    发明公开
    Process for producing high purity solutions of alkali metal hydrosulfites 失效
    一种生产高纯度Alkalimetallhydrosulfitlösungen过程。

    公开(公告)号：EP0192438A2

    公开(公告)日：1986-08-27

    申请号：EP86301039.3

    申请日：1986-02-14

    申请人： OLIN CORPORATION

    发明人： Cawlfield, David William

    IPC分类号： C01B17/66

    CPC分类号： C01B17/66

    摘要： High purity solutions of alkali metal hydrosulfites having low concentrations of alkali metal thiosulfates are produced in a process which comprises feeding an alcohol-free aqueous solution of an alkali metal hydrosulfite containing an alkali metal thiosulfate as an impurity to a crystallizing zone. Produced in the crystallizing zone is a slurry of alkali metal hydrosulfite crystals which is conveyed from the crystallizing zone to a separating zone. The separating zone, employing a non-gravitational separation means, recovers a slurry of alkali metal hydrosulfite crystals from a first mother liquor. A portion of the slurry of alkali metal hydrosulfite crystals is conveyed to a concentrating zone to recover a cake of alkali metal hydrosulfite crystals from a second mother liquor. The cake alkali metal hydrosulfrte hydrate crystals is admixed with water in a dissolving zone to produce a purified solution of an alkali metal hydrosulfite having reduced concentrations of said alkali metal thiosulfate as an impurity.
    The process is operated to minimize the residence time of alkali metal hydrosulfite containing mother liquors in the crystallizing zone and prevent significant decomposition of the crystals of alkali metal hydrosulfite.

    Process for the production of dithionites
    4.
    发明公开
    Process for the production of dithionites 失效
    一种用于生产连二亚硫酸盐的过程。

    公开(公告)号：EP0068248A1

    公开(公告)日：1983-01-05

    申请号：EP82105148.9

    申请日：1982-06-12

    申请人： MITSUBISHI GAS CHEMICAL COMPANY, INC.

    发明人： Arakawa, Satoshi MITSUBISHI GAS CHEMICAL COMPANY

    IPC分类号： C01B17/66

    CPC分类号： C01B17/66

    摘要： An improvement in the process for producing anhydrous dithionites by reacting formic acid or a formate with an alkali compound and sulfurous acid anhydride in a mixture of water and organic solvent; filtering dithionite crystals from the mother liquor; and washing the dithionite crystals with an organic solvent as a washing liquid and then drying the dithionite crystals. The improvement comprises dividing the washing liquid into two portions which are discharged as the washing liquid first discharged and the washing liquid discharged subsequently from the washing operation and treating the washing liquid first discharged to convert substances contained therein which inhibit the production of dithionite into harmless substances and recycling both the treated washing liquid first discharged and the washing liquid discharged subsequently which does not require treatment as a reaction solvent.

    Stable precursor solution for the generation of hydrosulfite and use thereof in bleaching wood pulp, brightening kaolin clay and reducing vat dyestuffs to their leuco form
    5.
    发明公开
    Stable precursor solution for the generation of hydrosulfite and use thereof in bleaching wood pulp, brightening kaolin clay and reducing vat dyestuffs to their leuco form 失效
    用于生产的亚硫酸氢盐以及它们在纸浆漂白用稳定起始溶液从高岭土和在还原染料还原成它们的无色形式减轻。

    公开(公告)号：EP0027369A1

    公开(公告)日：1981-04-22

    申请号：EP80303584.9

    申请日：1980-10-10

    申请人： THIOKOL CORPORATION

    发明人： Guess, Robert G.

    IPC分类号： C01B17/66

    CPC分类号： D21C9/1084 ,  C01B17/66 ,  C04B33/10 ,  D06P1/221

    摘要： Substantially stable aqueous solutions comprise sulfite ions and borohydride ions in a molar ratio of sulfite ions to borohydride ions of at least 6.0 to 1 and contain sufficient hydroxyl ion to give a pH greater than 8. Such solutions have excellent long term storage stability. By reducing the pH to below 8 aqueous hydrosulfite solutions may be generated therefrom and these may be used in bleaching wood pulp, in brightening kaolin clay and in the reduction of vat dyestuffs to their leuco form, either in suspension or in contact with textile materials.

    摘要翻译： 基本上稳定wässrige溶液包含在亚硫酸根离子的摩尔比亚硫酸根离子和硼氢化离子硼氢化物的至少6.0至1的离子和含有足够的羟基离子，得到的pH值大于8的搜索解决方案具有优异的长期储存稳定性。 通过将pH值降低至低于8种wässrige亚硫酸氢盐溶液可以从那里产生的和合成可以在增亮高岭土和在大桶染料还原成它们的无色形式漂白木浆被使用，无论是在悬浮液中或在纺织材料接触。

    STABILIZED CHOLINE SOLUTIONS AND METHODS FOR PREPARING THE SAME
    6.
    发明公开
    STABILIZED CHOLINE SOLUTIONS AND METHODS FOR PREPARING THE SAME 审中-公开
    稳定CHOLINLÖSUNGEN及其制备方法

    公开(公告)号：EP2782899A1

    公开(公告)日：2014-10-01

    申请号：EP12801483.4

    申请日：2012-11-22

    申请人： Taminco

    发明人： MOONEN, Kristof ,  GERNON, Michael, David

    IPC分类号： C07C213/10 ,  C07C215/40 ,  C07C239/10 ,  C01B17/66

    摘要： A method for the stabilization of an aqueous choline hydroxide solution includes optionally, adding a first stabilizer of a dithionite salt or a dialkylhydroxylamine to an aqueous solution containing reactants that will produce an aqueous choline hydroxide solution; and after the aqueous choline hydroxide solution is formed, adding a second stabilizer of a dithionite salt or a dialkylhydroxylamine to the aqueous choline hydroxide solution. The stabilized choline hydroxide solution may include choline hydroxide, water, and a dithionite salt and/or a dialkylhydroxylamine as a stabilizer present in an amount of about 100 ppm to about 2000 ppm by weight of the stabilized choline hydroxide solution.

    METHOD FOR PREPARING DITHIONITE AND USE THEREOF
    7.
    发明授权
    METHOD FOR PREPARING DITHIONITE AND USE THEREOF 有权
    用于生产连二亚硫酸钠和需求

    公开(公告)号：EP2150489B1

    公开(公告)日：2011-08-24

    申请号：EP08761628.0

    申请日：2008-04-25

    申请人： Kemira OYJ

    发明人： RAHKOLA, Risto

    IPC分类号： C01B17/66 ,  D21C9/10

    CPC分类号： D21C9/1089 ,  C01B17/66 ,  C01D7/07

    摘要： The present invention relates to a method for preparing dithionite solution with a reaction wherein sodium bisulfite is reduced with sodium borohydride solution to obtain dithionite, wherein the rise of the pH of the solution is prevented by adjusting the pH with carbon dioxide.

    METHOD FOR PREPARING DITHIONITE
    8.
    发明公开
    METHOD FOR PREPARING DITHIONITE 有权
    用于生产连二亚硫酸钠和需求

    公开(公告)号：EP2150489A1

    公开(公告)日：2010-02-10

    申请号：EP08761628.0

    申请日：2008-04-25

    申请人： Kemira OYJ

    发明人： RAHKOLA, Risto

    IPC分类号： C01B17/66 ,  D21C9/10

    CPC分类号： D21C9/1089 ,  C01B17/66 ,  C01D7/07

    摘要： The present invention relates to a method for preparing dithionite solution with a reaction wherein sodium bisulfite is reduced with sodium borohydride solution to obtain dithionite, wherein the rise of the pH of the solution is prevented by adjusting the pH with carbon dioxide.