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    • 103. 发明公开
    • Method for stabilizing rhodium compound
    • Verfahrenfürdie Stabilisierung von Rhodiumverbindungen。
    • EP0618009A1
    • 1994-10-05
    • EP94105086.6
    • 1994-03-30
    • DAICEL CHEMICAL INDUSTRIES, LTD.
    • Tanigawa, Hiroto
    • B01J31/40C07C51/573
    • C07C51/56B01J27/08B01J31/0212B01J31/0231B01J31/04B01J31/146B01J31/1805B01J31/20B01J31/2234B01J31/2404B01J31/26B01J31/4046B01J2531/31B01J2531/822C07C51/12C07C51/573Y02P20/584
    • A concentrated catalyst solution provided in the carbonylation reaction in which methyl acetate or dimethyl ether is chemically bonded with carbon monoxide in the presence of a catalyst system comprising a rhodium compound and an alkali metal iodide to produce acetic anhydride is subjected to a carbonylation treatment with carbon monoxide or a mixture of carbon monoxide and hydrogen before it is applied to a process for separating the tar contained in the catalyst solution, thereby increasing the iodide ion content of the catalyst solution, thus enabling the rhodium compound to be stabilized.
      When the concentration of the iodide ion in the concentrated catalyst solution is increased by this method, there is no possibility of the balances between the rhodium concentration and, the alkali metal concentration and the iodine concentration of the carbonylation reaction system being disturbed even when the catalyst solution as reprocessed is returned to the carbonylation reaction system. Further, the increase in the iodide ion concentration of the concentrated catalyst solution enables the rhodium compound contained in the concentrated catalyst solution to be stabilized, which prevents the rhodium compound from settling from the catalyst solution even during the heat treatment conducted for the purpose of removing components each having a low-boiling point contained in the catalyst solution before the process for separating and removing tar from the concentrated catalyst solution, so that the loss of the very expensive rhodium compound can be minimized.
    • 在包含铑化合物和碱金属碘化物的催化剂体系存在下制备乙酸酐的羰基化反应中提供的浓缩催化剂溶液中,其中乙酸甲酯或二甲醚与一氧化碳化学键合,进行碳的羰基化处理 一氧化碳或一氧化碳和氢气的混合物,然后再用于分离催化剂溶液中所含的焦油的方法,从而提高催化剂溶液的碘离子含量,从而使铑化合物稳定。 当通过该方法增加浓缩催化剂溶液中碘化物离子的浓度时,即使催化剂中的铑浓度与羰基化反应体系的碱金属浓度和碘浓度之间也不会有平衡, 再次处理的溶液返回到羰基化反应体系。 此外,浓缩的催化剂溶液的碘离子浓度的增加使得浓缩的催化剂溶液中所含的铑化合物能够稳定,从而即使在为了除去目的进行的热处理中也可以使铑化合物从催化剂溶液中沉降 在浓缩催化剂溶液中分离除去焦油的方法之前,在催化剂溶液中含有低沸点的组分,从而可以使非常昂贵的铑化合物的损失最小化。