Process for producing high octane gasoline

Claim 1

A process for conversion of C 2 + olefins and C 3 + paraffins to high octane C 5 + gasoline rich in methyl tertiary alkyl either and C 5 + gasoline rich in alkylated aromatics comprising the steps of: (a) contacting a hydrocarbon feedstock mixture containing C 4 + iso-olefins and methanol with an etherification catalyst under etherification conditions whereby an etherification effluent stream is produced comprising methyl tertiary alkyl ethers, unreacted methanol and hydrocarbons; (b) passing said effluent stream to a fractionator for separation in contact with a hydrocarbon stripping medium to produce a liquid stream comprising C 5 + gasoline rich in methyl tertiary alkyl ether and a vapor stream comprising methanol and C 5 and lower hydrocarbons; (c) reacting step b vapor stream and a feedstock stream comprising aromatic and olefins-rich hydrocarbons in contact with shape-selective medium pore metallosilicate catalyst particles in a conversion zone at elevated temperature under olefins conversion and aromatics alkylation conditions to recover after separation reaction product streams comprising a first C 5 + gasoline stream rich in alkylated aromatics, a second stream comprising C 3 and C 4 paraffinic hydrocarbons and a third stream comprising C 2 and lower hydrocarbons; (d) passing said second C 3 and C 4 paraffinic hydrocarbon stream to an aromatization zone and contacting with medium-pore size shape selective metallosilicate catalyst particles under paraffins aromatization conditions whereby an aromatization zone effluent stream comprising olefinic, aromatic and unreacted C 3 and C 4 paraffinic hydrocarbons is produced; and (e) separating said aromatization zone effluent stream and passing aromatic and olefinic components thereof to step c conversion zone whereby C 5 + gasoline rich in alkylated aromatics is produced.