Abstract:

Butadiene extraction process by acetonitrile is the main process for the production of 1,3-butadiene, and the tail gas from the unit is directly vented to flare system. With the rapid development of China’s chemical industry, the rational use of tail gas can not only improve economic benefits, but also meet the principle of sustainable development. In this paper, the recovery and utilization of tail gas from the solvent recovery system in butadiene extraction unit by acetonitrile is studied. The results show that the improved tail gas recovery process can recover an additional 496 tons of C₄ and recover 128 tons of acetonitrile loss each year.

Key words: acetonitrile extraction, 1,3-butadiene, tail gas recovery, economic benefits