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124 条记录 (耗时 0.028 秒)

    Reactive Extraction of Free Organic Acids from the Ammonium Salts Thereof
    87.
    发明申请
    Reactive Extraction of Free Organic Acids from the Ammonium Salts Thereof 审中-公开
    从其铵盐中反应提取游离有机酸

    公开(公告)号：US20100210871A1

    公开(公告)日：2010-08-19

    申请号：US12706512

    申请日：2010-02-16

    申请人： Christoph Kobler ,  Dieter Buss ,  Axel Ronneburg ,  Christoph Weckbecker

    发明人： Christoph Kobler ,  Dieter Buss ,  Axel Ronneburg ,  Christoph Weckbecker

    IPC分类号： C07F9/535 ,  C07C61/00 ,  C07C59/01 ,  C07C59/10 ,  C07C53/126 ,  C07C309/25

    CPC分类号： C07F9/3834 ,  C07C51/02 ,  C07C51/48 ,  C07C303/22 ,  C07C319/20 ,  C07C2602/42 ,  C07C59/01 ,  C07C59/08 ,  C07C53/126 ,  C07C323/52 ,  C07C309/27

    摘要： The invention relates to a process for converting ammonium salts of organic acids to the particular free organic acid, wherein an aqueous solution of the ammonium salt is contacted with an organic extractant and the salt is dissociated at temperatures and pressures at which the aqueous solution and the extractant are in the liquid state, and a stripping medium or entraining gas is introduced in order to remove NH3 from the aqueous solution and transfer at least a portion of the free organic acid formed to the organic extractant. The invention described here thus provides an improved process for releasing an organic acid, preferably a carboxylic, sulphonic or phosphonic acid, especially an alpha-hydroxycarboxylic acid or beta-hydroxycarboxylic acid, from the ammonium salt thereof by release and removal of ammonia and simultaneous extraction of the acid released with a suitable extractant from the aqueous phase. This process corresponds to a reactive extraction. The reactive extraction of an organic acid from the aqueous ammonium salt solution thereof can be improved significantly by the use of a stripping medium or entraining gas, for example nitrogen, air, steam or inert gases, for example argon. The ammonia released is removed from the aqueous solution by the continuous gas stream and can be fed back into a production process. The free acid can be obtained from the extractant by a process such as distillation, rectification, crystallization, re-extraction, chromatography, adsorption, or by a membrane process.

    摘要翻译： 本发明涉及将有机酸的铵盐转化为特定的游离有机酸的方法，其中铵盐的水溶液与有机萃取剂接触，并且盐在水溶液和 萃取剂处于液体状态，并且引入汽提介质或夹带气体以从水溶液中除去NH 3并将至少一部分形成的游离有机酸转移到有机萃取剂中。 因此，这里描述的发明提供了一种通过释放和除去氨并同时提取从其铵盐中释放有机酸，优选羧酸，磺酸或膦酸，特别是α-羟基羧酸或β-羟基羧酸的改进方法 的酸从水相中用合适的萃取剂释放。 该过程对应于反应萃取。 通过使用汽提介质或夹带气体，例如氮气，空气，蒸气或惰性气体，例如氩气，可以显着地改善有机酸从其铵盐水溶液中的反应萃取。 释放的氨通过连续气流从水溶液中除去，并可以反馈到生产过程中。 游离酸可以通过蒸馏，精馏，结晶，再萃取，色谱法，吸附法或膜法等方法从萃取剂得到。

    Process for preparing alkyl mercaptans in a multizone fixed bed reactor
    89.
    发明授权
    Process for preparing alkyl mercaptans in a multizone fixed bed reactor 有权
    在多区域固定床反应器中制备烷基硫醇的方法

    公开(公告)号：US07582800B2

    公开(公告)日：2009-09-01

    申请号：US11827154

    申请日：2007-07-11

    申请人： Hubert Redlingshoefer ,  Christoph Weckbecker

    发明人： Hubert Redlingshoefer ,  Christoph Weckbecker

    IPC分类号： C07C319/00

    CPC分类号： C07C319/08 ,  C07C321/04

    摘要： The invention relates to a process for preparing alkyl mercaptans by catalytic gas phase reaction of alkanols and hydrogen sulphide over alkali metal tungstates, the reaction being performed in at least two successive reaction zones which contain catalysts of different activity and selectivity.

    摘要翻译： 本发明涉及通过链烷醇和硫化氢与碱金属钨酸盐的催化气相反应制备烷基硫醇的方法，该反应在含有不同活性和选择性的催化剂的至少两个连续反应区中进行。

    Process for the preparation of α-substituted carboxylic acids from the series comprising α-hydroxycarboxylic acids and n-substituted-α-aminocarboxylic acids
    90.
    发明授权
    Process for the preparation of α-substituted carboxylic acids from the series comprising α-hydroxycarboxylic acids and n-substituted-α-aminocarboxylic acids 有权
    从包含α-羟基羧酸和n-取代的α-氨基羧酸的系列制备α-取代的羧酸的方法

    公开(公告)号：US07332067B2

    公开(公告)日：2008-02-19

    申请号：US10559766

    申请日：2004-06-03

    申请人： Christian Reufer ,  Martin Hateley ,  Thomas Lehmann ,  Christoph Weckbecker ,  Rainer Sanzenbacher ,  Jürgen Bilz

    发明人： Christian Reufer ,  Martin Hateley ,  Thomas Lehmann ,  Christoph Weckbecker ,  Rainer Sanzenbacher ,  Jürgen Bilz

    IPC分类号： C25B3/00

    CPC分类号： C25B3/04

    摘要： A process for the preparation of α-substituted carboxylic acids from the series including α-hydroxycarboxylic acids and N-substituted-α-aminocarboxylic acids by cathodic carboxylation with carbon dioxide of a compound corresponding to the general formula R1—C(═X)R2 which is constituted by aldehydes, ketones or N-substituted imines. In the past, that carboxylation has taken place in an undivided electrolytic cell with the use of a sacrificial anode. As described herein, the carboxylation takes place in the absence of a sacrificial anode in an electrolytic cell divided by a separator, at a diamond film cathode. The anode is formed of a material which is stable under electrolytic conditions; in particular, it is a diamond film electrode. The catholyte includes an organic solvent and a conducting salt.

    摘要翻译： 通过阴离子羧化与通式R 1对应的化合物的二氧化碳从包括α-羟基羧酸和N-取代的α-氨基羧酸的系列制备α-取代的羧酸的方法 > - （-X）R 2，其由醛，酮或N-取代的亚胺构成。 在过去，使用牺牲阳极在不分开的电解槽中发生羧化。 如本文所述，在金刚石膜阴极处，在电解槽中除去隔离层的牺牲阳极不存在下进行羧化。 阳极由在电解条件下稳定的材料形成; 特别是金刚石膜电极。 阴极电解液包括有机溶剂和导电盐。