PROCESS TO MAKE PROPYLENE FROM ETHYLENE AND METHANOL AND DIMETHYL ETHER.

摘要

The present invention is a process to make propylene comprising : a) providing a reaction zone containing a catalyst; b) introducing a feedstock comprising ethylene, methanol or dimethyl ether or methanol and dimethyl ether, optionally steam into said reaction zone and into contact with said catalyst; c) operating said reaction zone at temperature and pressure conditions to produce an effluent comprising propylene, hydrocarbons, steam, optionally unconverted methanol and /or unconverted dimethyl ether and optionally unconverted ethylene; d) sending the effluent of step c) to a fractionation zone to recover propylene optionally methanol and /or dimethyl ether and optionally ethylene; e) optionally recycling at least a part of methanol and /or dimethyl ether and optionally recycling at least a part of ethylene to the reaction zone at step b); wherein the catalyst is an acid and the temperature at the inlet of the reaction zone is under 280°C and advantageously from 50 to 280°C.