Patent ID: 8716543

Claim:
A process to make propylene comprising: a) providing a reaction zone containing a catalyst; b) introducing a feedstock comprising ethylene, dimethyl ether or a mixture of dimethyl ether and up to 10 wt. % of methanol, and 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 up to 160° C.