Studies On The Ethanol To Gasoline

Olefins> parafins and aromatics are very important basic feedstocks of petrochemical industry. They are traditionally produced from petroleum feedstock. With the decrease of oil resources and the rise in oil prices, it is a trend to develop non-petroleum based technologies to produce olefins, paraffins and aromatics. Ethanol to hydrocarbons (ETH) processes is the strategy choices of Chinese petrochemical industry and has great potential in development and application.Conversion of ethanol to liquid hydrocarbons using zeolite catalysts ZSM-5, H-ZSM-5 and Zn-ZSM-5 was studied in a fixed-bed reactor in the range of 280℃ to 450 ℃. The products were gaseous light olefins, liquid hydrocarbons and water. The liquid hydrocarbons were analyzed by GC-MS and major products were C5-9 olefins, C4..7 alkane and C6-n aromatics.The Si/Al ratio and temperature had a great impact on the transformation of ethanol. The yield of liquid hydrocarbons was decreased with the increase of the Si/Al ratio at the content temperature. The yield of liquid hydrocarbons was increased to the maximum then decreased with the increase of the temperature at the content Si/Al ratio. When the Si/Al ratio was 25, the maximum yield of liquid hydrocarbons were 17.7%,16.8% and 13.8%(wt.%) separately for ZSM-5, Zn-ZSM-5 and H-ZSM-5 catalysts at 320℃,320 ℃,380℃, respectively.A novel supercritical ethanol to gasoline (SETG) process over zeolite catalyst ZSM-5 was proposed. In which supercritical ethanol was virtually converted to catalytic reforming gasoline, gas and water in a slurry reactor. The maximum yield of gasoline was 22.2 (wt.%) with 10 (wt.%) catalyst content for 40 min at 295℃and 13 MPa.44.20% C4-9 isoparaffins,34.86% C7-11 alkylbenzene,4.04%C8-9 olefins,6.76% diethyl ether and 3.92% naphthenes were obtained in catalytic reforming gasoline and analyzed by GC-MS. It was found that the gasoline yield was affected by temperature, catalyst content and reaction time.