Technology Study On The Preparation Of Propene By Co-Reaction Of Methanol And Butene/Pentene

The coupling reactions of methanol and butene/pentene to produce propenehave been investigated on H-ZSM-5mesoporous zeolite. The influence of reaction condition on product distribution have been discussed and explained based on reaction mechanism. Reaction temperature, feeding ratio, and space time havebeen optimized to enhance propene yield and reduce by-products. Our main results are:（1）co-feeding of methanol and C₄/C₅alkene can obviously reduce the heat effect of these reaction systems;（2）proper temperature range for H-ZSM-5is420-500℃;（3）moderate decrease of space time helps enhancing propene/ethene ratio and reducing by-products effectively, we note that the space time should beselected as5gcat*h/mol for methanol-butene coupling and3-5for methanol-pentene;（4）compared to feeding separately, coupling reactions can apparently reduce by-products, the best feeding ratio of methanol-butene and methanol-pentene have been proposed after optimization;（5）isomers of the same alkene make little difference to this investigation and （6）the proportion of butene and pentene isnot important, too. The product distribution is mainly determined by reaction temperature, space time and methanol/alkene ratio.