| abstract |
A process is described for the production of hydrocarbonsnwith a high octane number starting from hydrocarbon cutsncontaining isobutene by selective dimerization with acidncatalysts, characterized in that the dimerization reactionnis carried out in the presence of tertiary alcohols, alkylnethers and primary alcohols in such a quantity as to have,nin the feeding, a molar ratio tertiary alcohols + alkylnethers + primary alcohols/isobutene higher than 0.1, a molarnratio tertiary alcohols/isobutene lower than 0.2 and anmolar ratio primary alcohols/isobutene lower than 0.2,npreferably operating at a reaction temperature ranging fromn30 to 120°C, at a pressure lower than 5 MPa and feedingnspace velocities of less than 30 h -1 . |