A process for producing carboxylic acid anhydrides by the carbonylation reaction of a carboxylic acid ester, derived from an alcohol and a carboxylic acid, with carbon monoxide containing a small amount of hydrogen in a liquid reaction medium in the presence of a Group VIII B catalyst to produce a carboxylic acid anhydride. The reaction medium comprises the Group VIII B catalyst, an organic halide, the carboxylic acid ester, an alkali metal salt, the carboxylic acid anhydride, the carboxylic acid, and at least one ionic liquid consisting of a cation and an anion where the cation of the ionic liquid has a nitrogen-containing heterocyclic structure. The ionic liquid has at least one of the following structural forms:
The reaction rate of the carbonylation reaction is increased by the use of the specified ionic liquid promoters.
一种通过
羧酸酯的羰基化反应制备
羧酸酐的方法,该
羧酸酯由醇和
羧酸衍生而来,与含有少量
氢气的
一氧化碳在液态反应介质中,在第VIII B族催化剂的存在下,产生
羧酸酐。反应介质包括第VIII B族催化剂、有机卤素、
羧酸酯、碱
金属盐、
羧酸酐、
羧酸和至少一种
离子液体,该
离子液体由一个阳离子和一个阴离子组成,其中
离子液体的阳离子具有含氮杂环结构。
离子液体至少具有以下结构形式:使用指定的
离子液体促进剂可增加羰基化反应的反应速率。