At present, the acetic acid crackin

At present, the acetic acid cracking method and methyl acetate carbonylation method are the most commonly used and relatively mature methods in the production of acetic anhydride. Among them, the acetic acid cracking process has a large investment in the production of acetic anhydride, the cost of raw materials and utilities is high, and the production cost is high. The investment cost of the acetic acid cracking process is as high as 16.3 billion US dollars, while the investment cost of the methyl acetate carbonylation process is 96 million US dollars, accounting for only 60% of the acetic acid cracking process and 68% of the total acetic acid cracking process. The net production cost of the acetic acid cracking process. With the continuous development of technology, the raw material cost of the carbonylation method is higher than that of the acetic acid cracking method. Therefore, this paper designs a cracking process for the preparation of acid anhydride. The selected preparation method is the acetic acid cracking method.