Refining method of rough acetic anhydride and acetic anhydride

The invention provides a process for refining rough acetic anhydride and acetic anhydride thereof, characterized in that the refining process comprises the steps of, distilling and processing the rough acetic anhydride by using gas containing ozone, wherein the sulfuric acid staining test value of the acetic anhydride is below 10APHA at a temperature of 80-120 deg. C for over five hours. 本发明公开了一种粗制乙酐的精制法及乙酐，所述粗制乙酐的精制法的特征在于，将粗制乙酐蒸馏后用含有臭氧的气体处理；所述乙酐在实施80～120℃、5小时以上的加热处理后硫酸着色试验值在10APHA以下。用本发明可以得到双烯酮含有率小的精制乙酐，使用这样的乙酐，可以制造出色泽优美的聚氧化1，4-丁二醇等的制品。本发明的精制乙酐在加热时不会产生着色等的品质问题。