METHOD FOR PRODUCING PROPYLENE FROM A FLOW CONTAINING C4 TO C8 OLEFINS

摘要

The invention relates to a method for producing propylene, whereby a flow containing C4 to C6 olefins is evaporated, overheated, and mixed with water vapour, the olefin/steam mixture is reacted on a zeolite catalyst, and the reaction mixture thus formed is cooled and then partially condensed. In order to increase the yield of propylene, the gas phase resulting from the partial condensation and containing ethylene, propylene, C4 to C8 olefins and other hydrocarbons, is condensed, and the gas and liquid phase resulting from said condensation step and containing propylene, ethylene and other light hydrocarbons, is separated into a gas phase containing propylene, ethylene and other light hydrocarbons, and a liquid phase containing C4+ olefins, and the liquid phase is separated into a fraction containing C4 to C6 olefins and a fraction containing C7+ olefins.