process for making olefins from methanol and isobutanol

摘要

process for making olefins from methanol and isobutanol. The present invention relates to a process for making essentially ethylene and propylene comprising: a) providing an alcohol mixture (a) comprising about 20 wt% to 100% isobutanol, b) introduced into a reactor (a) a flow comprising mixing (a) with methanol or dimethyl ether or mixtures thereof, optionally water, optionally an inert component, c) contracting said flow with a catalyst (a1) in said reactor (a), the reactor mto, under conditions effective to convert at least a part of the alcohol mixture (a) and at least a part of the methanol and / or dimethyl ether in olefins, d) recovering from said reactor (a) an effluent comprising: ethylene, propylene, butane, water, optionally non-alcohol. various hydrocarbons, and the optional inert component of step b), e) fractioning said effluent from step d) to produce at least one ethylene stream, one propylene stream, a fraction consisting essentially of hydrocarbons having 4 atoms carbon or more, water and the optional inert component of step a), optionally recycling ethylene in whole or in part at the reactor inlet (a), optionally recycling the fraction consisting essentially of hydrocarbons having 4 or more carbon atoms in the inlet of the reactor (a).