METHANOL-TO-PROPYLENE CONVERSION PROCESS

摘要

FIELD: petrochemical processes.;SUBSTANCE: methanol vapors are converted on first catalyst into vapor mixture containing dimethyl ether and first vapor mixture is then converted on form-selective zeolite catalyst into propylene-containing product mixture. Form-selective zeolite catalyst is disposed in the form of charge in at least two in series connected shaft reactors. First portion of dimethyl ether-containing vapor mixture stream is passed to first shaft reactor, wherefrom first intermediate product is withdrawn and routed to second reactor, into which second portion of dimethyl ether-containing vapor mixture stream is supplied. From the last of in series connected reactors, product mixture is discharged and propylene-rich fraction is separated whereas residual materials thus obtained are partly in gaseous form. Al least a part of the latter are recycled into one of shaft reactors.;EFFECT: enhanced process efficiency and increased level of propylene in product mixture.;10 cl, 2 dwg, 1 tbl, 2 ex