四氯苯酐的合成

Preparation of Tetrachlorophthalic Anhydride

以苯酐为原料，以２５％发烟硫酸为溶剂，碘催化条件下在３个温度梯度下———４５℃、６０℃、１６０℃通氯，反应１０ｈ，制备出四氯苯酐，熔点２４５～２５６℃，纯度９８．５％以上，收率为９８％。

A new economical method of preparing tetrachlorophthalic anhydride,starting with phthalic anhydride,catalyzed by iodine in fuming sulfuric acid at three different temperatures(45,60,160)for ten hours in 98% yield and 98.5% purity was introduced.