Abstract:

The high-alkyne exhaust gas from butadiene extraction unit is rich in vinyl acetylene, a hazardous substance, so a significant amount of butane or butene is used to dilute the exhaust gas before it is discharged to the flare system, resulting in waste of resources and greenhouse gas emissions. Through the use of selective hydrogenation technology, the alkynes and dienes in exhaust gas are hydrogenated to butene. The hydrogenated C₄ products can be used as raw materials for downstream units or sold externally. The system recovers approximately 14,368 tons of high alkyne exhaust gas per year, generating an after-tax net profit of approximately 12.06 million yuan per year. The operation of the selective hydrogenation unit reduces the emission of exhaust gas to the flare system, which is beneficial for carbon emission reduction and creates significant economic benefits.

Key words: selective hydrogenation')">

selective hydrogenation, butadiene, high-alkyne exhaust gas; recovery