Patent ID: 8273930

Claim:
A process for producing ethylene, characterized in that said process comprises the following steps: (1) contacting an ethanol feedstock with a first portion of a regenerated Y-zeolite containing catalyst to obtain a first product stream and to convert the first portion of the regenerated Y-zeolite containing catalyst into a coked catalyst in a first reactor, wherein the first portion of the regenerated Y-zeolite supplies heat to the conversion of the ethanol feedstock and wherein the first product stream is further separated in a first separation unit to obtain ethylene; (2) contacting a hydrocarbon feedstock with a second portion of the regenerated Y-zeolite containing catalyst to obtain a second product stream and convert the second portion of the regenerated Y-zeolite containing catalyst into a spent catalyst in a second reactor, wherein the second product stream is further separated in a second separation unit to obtain products comprising LPG, gasoline, and diesel oil; (3) regenerating a mixture of the coked catalyst and the spent catalyst in a regenerator by coke-burning to obtain the regenerated Y-zeolite containing catalyst, wherein the mixture comprises all or a portion of the coked catalyst and all or a portion of the spent catalyst; and (4) obtaining from the regenerated Y-zeolite containing catalyst the first portion of the regenerated Y-zeolite containing catalyst and the second portion of the regenerated Y-zeolite containing catalyst, wherein the hydrocarbon feedstock in step (2) is selected from the group consisting of vacuum gas oil, coker gas oil, deasphalted oil, hydrogenated bottom, atmospheric residuum, vacuum residuum and mixtures thereof, wherein the regenerated Y-zeolite containing catalyst comprises a Y-zeolite and one or more other molecular sieve and the weight ratio of said other molecular sieve to the Y-zeolite is less than or equal to 10.