乙酸或乙酸酐中含有丁烯酸甲酯、醋酸乙烯酯等杂质,这些杂质在接触到过量的臭氧转化成碳碳双键。丁烯酸甲酯或/和醋酸乙烯酯以及臭氧处理的过程中产生的其它杂质都可以通过蒸馏除去,通过常规的分离方法很难将不饱和化合物排出,蒸馏臭氧处理的醋酸和/或醋酐对丁烯酸甲酯和醋酸乙烯 Acetic acid or acetic anhydride contains methyl crotonate, vinyl acetate and other impurities, these impurities in contact with excessive ozone into carbon-carbon double bond. Methyl crotonate and / or vinyl acetate and other impurities generated during the ozone treatment can be removed by distillation. It is difficult to discharge the unsaturated compounds by a conventional separation method. The distilled ozone-treated acetic acid and / or acetic anhydride Methyl crotonate and vinyl acetate