FIELD: motor fuels. SUBSTANCE: process includes stage, in which hydrocarbon substrate is subjected to liquid-phase alkylation with olefin alkylating agent in presence of fluorinated sulfonic acid catalyst sorbed on fixed bed of granulated inert material, desired product isolation stage, and recycle of unreacted hydrocarbon substrate, which is added to reaction mixture leaving the first stage. EFFECT: improved quality of final product. 7 cl, 1 dwg, 2 ex
