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CN102476988A 羧酸酐的制造方法 失效 - 放弃专利权

羧酸酐的制造方法
摘要：
本发明涉及一种羧酸酐的制造方法，其以醇类与羧酸所衍生的羧酸酯与含少量氢气的一氧化碳为原料，在VIII B族催化剂存在下，于液态反应介质中进行羰化反应形成羧酸酐。该液态反应介质包括VIII B族催化剂、有机卤化物、羧酸酯、碱金属盐、羧酸酐、羧酸、保护剂N-乙酰基咪唑(N-acetylimidazole)以及有机助剂二醋酸亚乙酯(Ethylidene diacetate，EDA)。本发明的方法通过使用保护剂N-乙酰基咪唑来避免反应器中的金属离子与二醋酸亚乙酯作用，降低反应过程中所形成的难溶解焦油物，并使系统中维持一定含量的有机助剂二醋酸亚乙酯，以提高整体羰化反应速率。
摘要（英）：

The present invention relates to a method for preparing carboxyl anhydride. The method comprises adopting carboxylate derived from alcohol and carboxylic acid and carbon monoxide containing a small amount of hydrogen gas as raw material, and allowing oxonation in a liquid reaction medium in the presence of group VIIIB catalyst to produce carboxyl anhydride. The liquid reaction medium includes the group VIIIB catalyst, organic halide, carboxylate, alkali metal salt, carboxyl anhydride, carboxylic acid, a protectant N-acetylimidazole, and an organic additive ethylidene diacetate (EDA). The method avoids reaction of metal ions and EDA and decreases insoluble tar generated during reaction by using the protectant N-acetylimidazole, and improves whole oxonation rate by maintaining the content of the organic additive EDA at a constant level.

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