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50 条记录 (耗时 0.024 秒)

    Production of 2-phosphonobutane-1,2,4-tricarboxylic acid and the alkali metal salts thereof
    2.
    发明授权
    Production of 2-phosphonobutane-1,2,4-tricarboxylic acid and the alkali metal salts thereof 失效
    2-膦酰基丁烷-1,2,4-三羧酸及其碱金属盐的制备

    公开(公告)号：US5639909A

    公开(公告)日：1997-06-17

    申请号：US650681

    申请日：1996-05-20

    申请人： Christoph Holzner ,  Wolfgang Ohlendorf ,  Hans-Dieter Block ,  Horst Bertram ,  Roland Kleinstuck ,  Hans-Heinrich Moretto

    发明人： Christoph Holzner ,  Wolfgang Ohlendorf ,  Hans-Dieter Block ,  Horst Bertram ,  Roland Kleinstuck ,  Hans-Heinrich Moretto

    IPC分类号： C07F9/38 ,  C07F9/40

    CPC分类号： C07F9/3808 ,  C07F9/4006

    摘要： This invention relates to an improved process for the production of 2-phosphono-butane-1,2,4-tricarboxylic acid (PBTC) and the alkali metal salts thereof, in which process dialkyl phosphite, preferably dimethyl or diethyl phosphite, and ethene-1,2-dicarboxylic acid dialkyl ester, in particular the dimethyl or diethyl ester of maleic acid and/or fumaric acid, are initially reacted in the presence of a basic catalyst to yield a phosphonosuccinic acid tetraalkyl ester, the resultant ester is thereupon reacted without further working up with acrylic acid alkyl ester, preferably methyl or ethyl acrylate, in the presence of an alkaline catalyst and the reaction product obtained in this manner is saponified without further working up to yield PBTC or the alkali metal salts thereof. The product when mixed with bleaching lye exhibits reduced chlorine depletion.

    摘要翻译： 本发明涉及一种制备2-膦酰基 - 丁烷-1,2,4-三羧酸（PBTC）及其碱金属盐的改进方法，其中亚磷酸二烷基酯，优选亚磷酸二甲酯或二乙酯和乙烯 - 1,2-二羧酸二烷基酯，特别是马来酸和/或富马酸的二甲基酯或二乙酯，最初在碱性催化剂存在下反应，得到磷酸二琥珀酸四烷基酯，得到的酯随后反应而没有 进一步用丙烯酸烷基酯，优选丙烯酸甲酯或丙烯酸乙酯在碱性催化剂的存在下进行处理，将以这种方式获得的反应产物进行皂化而不进一步加工得到PBTC或其碱金属盐。 当与漂白碱液混合时，产品会减少氯的消耗。

    Continuous preparation of silica sols which contain large particles
    4.
    发明授权
    Continuous preparation of silica sols which contain large particles 失效
    连续制备含有大颗粒的硅溶胶

    公开(公告)号：US5964693A

    公开(公告)日：1999-10-12

    申请号：US67308

    申请日：1993-05-26

    申请人： Uwe Brekau ,  Hans-Dieter Block ,  Hans-Heinrich Moretto ,  Peter Schmidt ,  Peter Schober ,  Werner Ludovici

    发明人： Uwe Brekau ,  Hans-Dieter Block ,  Hans-Heinrich Moretto ,  Peter Schmidt ,  Peter Schober ,  Werner Ludovici

    IPC分类号： C01B33/141 ,  C01B33/143 ,  C01B33/14

    CPC分类号： C01B33/1435

    摘要： A process is provided for the preparation of aqueous silica sols having a particle size of 27 to 72 nm. by adding fresh acidic silica sol into the reactors of a multi stage cascade reactor wherein the reactors contain aqueous solution of colloidal silica sol of a pH of 8 or above. Each successive stage of the cascade reactor is supplied with overflow from the preceding stage. Alkaline compounds, such as alkaline sodium silicate solution, alkaline potassium silicate solution, sodium hydroxide solution or potassium hydroxide solution, are introduced into the first reactor or first reactors so that a pH value in the range of 8 to 12.5 is established in the reactors.

    摘要翻译： 提供了一种制备粒径为27至72nm的含水硅溶胶的方法。 通过将新鲜酸性二氧化硅溶胶加入到多级级联反应器的反应器中，其中反应器含有pH为8或更高的胶态二氧化硅溶胶的水溶液。 级联反应器的每个连续级从前级供给溢流。 将碱性化合物，例如碱性硅酸钠溶液，碱性硅酸钾溶液，氢氧化钠溶液或氢氧化钾溶液引入到第一反应器或第一反应器中，使得在反应器中建立8至12.5范围内的pH值。