关键词: 乙烯; 乙炔; 选择加氢; 选择性; 催化剂

Abstract: Selective hydrogenation for acetylene removal holds the key to preparation of polymer-graded ethylene. LY-C2 -02 catalyst is used in the ethylene plant of sequential separation process in the petrochemical industry. C2 fraction from deethanate column is fed into the hydrogenation unit after measured hydro-treatment. Acetylene is hydrogenated under action of the catalyst to be turned into ethylene, thus removing acetylene completely from C2 fraction. Prevention of ethylene hydrogenation is the key link in the C2 selective hydrogenation process, because ethylene from hydrogenation of acetylene is likely to be turned into acetylene again after hydrogenation. LY-C2 -02 catalyst is an integration of various technologies and adopts a multi-stage distributed pore structure with the characteristics of high activity and good selectivity. Selectivity of LY-C2 -02 catalyst is improved by 20 percent as compared to the traditional catalysts. The general performance reaches the world advanced level, with the indexes of selectivity leading the catalysts of the same kind. It has been used in the ethylene plants of post hydrotreating process at Lanzhou Petrochemical Company, Liaoyang Petrochemical Company and Daqing Petrochemical Company and achieved remarkable economic results with a great application value.

Key words: ethylene, acetylene, selective hydrogenation, selectivity, catalyst