METHOD OF PRODUCING HIGH-OCTANE MIXTURE OF ALKYL TERT-ALKYL ETHERS WITH HYDROCARBONS Russian patent published in 1997 - IPC

FIELD: internal combustion engine fuels. SUBSTANCE: mixtures are produced via contacting alcohols and hydrocarbon mixtures containing tertiary olefins with acidic heterogeneous catalyst at elevated temperature in reaction- rectification apparatus having one or several reaction zones with catalyst and at least one exhausting rectification zone and. In some cases, straight-flow reactor may be involved for preliminarily contacting starting materials. Method is distinguished with that starting materials and/or reaction mixture from straight-flow reactor is fed into reaction-rectification apparatus above catalyst bed and/or into cross-section not below the middle of catalyst bed. Product mixture containing chiefly ethers and hydrocarbons in amount at least 90% based on summary weight of starting mixture is withdrawn from the bottom of apparatus, whereas from its top, vapor stream is released which is further condensed and partly or entirely returned to top part of apparatus. Also possible are partially feeding 10 to 50% of condensate into exhausting rectification zone, advantageously by 5-25 plates below catalyst bed, and feeding 50% of condensate into straight-flow reactor. EFFECT: enhanced efficiency of process. 3 cl, 2 dwg