C4-C4-OLEFINS PROCESS FOR THE OBTAINMENT OF C3 AND C4-OLEFINS FROM A CLEANING CONTAINING C4-C-OLEFINS

摘要

Production of 3-4 olefins from a mixture containing 4-7C olefins comprises: (a) vaporising the mixture and mixing with water vapour, where wt. ratio of H2O:hydrocarbons is 0.5-3:1; (b) feeding the mixture containing the water vapour into a reactor at 380-700 degC containing a granular form-selective zeolite catalyst (pentasil type) having an atomic ratio Si:Al of 10-200:1; and (c) withdrawing a product mixture from the reactor whose temperature is 20-80 degC lower than the starting temperature and whose total content of propylene and butene isomers is at least 60 wt.% of the olefinic components of the starting mixture.