Abstract: In view of the problem of unqualified C₅ product quality and low output in the In order to solve the problems of unqualified C5 products and low output in the early stage of the start-up of deep catalytic cracking(DCC) unit, a series of measures were taken, such as revamping the extraction position of C₅ products in the light and heavy gasoline separation column, optimizing and adjusting the operation parameters, etc. The results showed that the purity of C₅ was increased to 93.64% from 78.4%, and the output was increased to 12 t/h from 1.5 t/h. Not only the goal of qualified product quality and increased production was achieved by these measures, but also the smooth operation of the downstream naphtha hydrogenation unit was ensured. It is the first time to directly produce mixed C₅ olefins in DCC unit. The annual economic benefit is more than 40 million yuan.

Key words: C₅ olefin, cracking naphtha, light gasoline, separation tower, operating parameters