System and method for recovering useful components from tail gas generated in synthesis of propionic acid from ethanol

The invention discloses a system and a method for recovering useful components from tail gas generated in synthesis of propionic acid from ethanol, and relates to the technical field of organic synthesis chemical industry. The method is applied to tail gas treatment of a propionic acid synthesis system, preparation of propionic acid comprises a synthesis system and a rectification system, the synthesis system is provided with a high-pressure tail gas outlet, the rectification system is provided with a low-pressure tail gas outlet, and the high-pressure tail gas outlet and the low-pressure tail gas outlet are both connected with absorption equipment. Ethanol and desalted water are arranged in the absorption equipment and are used as tail gas absorbents. The problem that absorption equipment is corroded by an absorbent can be solved while useful components in the tail gas are recovered, and the effect of greatly reducing the tail gas recovery cost is achieved. 本发明公开了一种从乙醇合成丙酸尾气中回收有用组份的系统及方法，涉及有机合成化工技术领域。本发明应用于丙