Abstract：To develop an environmentally friendly technology of trace olefins removal for reforming aromatic hydrocarbons, the reaction process for the removal of trace olefins from reforming heavy aromatic hydrocarbons over solid acid catalyst was studied in a fix-bed reactor. With the increase of catalyst heat treatment temperature, the catalyst could have better activity stability. With increase of reaction temperature and decrease of weight-hourly space velocity (WHSV), the conversion of olefins increased. Under the reaction conditions of temperature of 240 ℃, pressure of 2.0 MPa, WHSV of 1.0 h-1, the conversion of olefins drops from 91.4% to 85.8% through time on streams of 90 days with the catalyst treated in nitrogen flow of 300 ℃. The aromatic hydrocarbons refinement did not affect the components of the aromatic mixtures. The bromine index of refined aromatics maintained below levels of 100 mg-Br/100 g and the olefins conversion maintained more than 88% through time on stream of 120 days under the reaction conditions of temperature of 220—260 ℃, pressure of 3.0 MPa, WHSV of 1.0 h-1. The coking deactivated catalysts were regenerated in situ through extraction with alcohol or dichloromethane, and through burning in air stream. The catalytic activities of three kinds of regenerated catalysts were all close to the catalytic activity of new catalyst. The new refined technology for reforming aromatics has a good application prospect.
Ren Jie,Chen Xiangfei,Yuan Haikuan. Reaction Process for Removal of Trace Olefins from Reforming Aromatic Hydrocarbons over Solid Acid Catalyst[J]. 化学反应工程与工艺, 2014, 30(2): 150-155.
