Abstract: A motor fuel comprising 35-98% hydrocarbon-containing base and 2-65% by volume of an additive which comprises a mixture containing(a) 5-35% by volume of methyl tert-butyl ether;(b) 5-40% by volume of isopropyl tert-butyl ether; and(c) 5-40% by volume of sec-butyl tert-butyl ether,has a high octane number and reduces exhaust pollutants.

Abstract: A process for producing isopropyl alcohol and isopropyl tert-butyl ether from a mixture of light hydrocarbons containing propane and butane, comprises:(a) separating from the mixture of light hydrocarbons a propane fraction and a butane fraction containing at least n-butane;(b) isomerizing at least a portion of the n-butane in the butane fraction from step (a) whereby a hydrocarbon mixture containing at least n-butane and isobutane is formed;(c) catalytically dehydrogenating the isobutane in the hydrocarbon mixture from step (b) whereby a hydrocarbon mixture containing at least isobutene is produced;(d) catalytically dehydrogenating the propane in the propane fraction from step (a) whereby a hydrocarbon mixture containing at least propene is produced;(e) reacting the propene in the hydrocarbon mixture from step (d) with water, whereby a mixture containing hydrocarbons and isopropyl alcohol is formed;(f) reacting the isopropyl alcohol from step (e) with at least part of the isobutene in the hydrocarbon mixture