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    • 3. 发明授权
    • Preparation process of 2-chloropropionaldehyde
    • 2-氯丙醛的制备方法
    • US4654445A
    • 1987-03-31
    • US800966
    • 1985-11-22
    • Hiroshi OnoKanemitsu MiyamaTakaharu Kasuga
    • Hiroshi OnoKanemitsu MiyamaTakaharu Kasuga
    • C07C45/49C07C45/50
    • C07C45/49
    • This invention relates to a process for preparing 2-chloropropionaldehyde (2-CPA) by using vinyl chloride, carbon monoxide and hydrogen as raw materials. Although processes making use of cobalt catalysts have conventionally been known, it is disclosed herein that by using a rhodium compound and a nitrogen- or phosphorus-containing Lewis base in combination as a catalyst, the reaction is allowed to proceed at temperature and pressure lower than those required for such conventional processes and the selectively toward the intended product is improved. It is also disclosed that by causing water to exist in the reaction system and using a water-insoluble organic solvent, fractionating the reaction mixture into a water layer and an organic layer after the reaction and then collecting 2-CPA from the water layer through distillation, extraction or the like, the rhodium compound contained substantially in its entirety in an organic layer can be reutilized in the form of its solution. This process is an extremely good process suitable for use in the preparation of 2-CPA which is useful as an intermediate for chemical products, agricultural chemicals, pharmaceutical products, etc.
    • 本发明涉及以氯乙烯,一氧化碳和氢为原料制备2-氯丙醛(2-CPA)的方法。 虽然使用钴催化剂的方法通常是已知的,但是本文公开了通过组合使用铑化合物和含氮或磷的路易斯碱作为催化剂,使反应在低于 这些常规方法所需的和选择性地朝向预期产品的那些被改进。 还公开了通过使水存在于反应体系中并使用水不溶性有机溶剂,在反应后将反应混合物分馏成水层和有机层,然后通过蒸馏从水层中收集2-CPA ,提取物等,基本上在有机层中全部含有的铑化合物可以以其溶液的形式再利用。 该方法是适用于制备2-CPA的非常好的方法,可用作化学产品,农药,药品等的中间体。