| 摘要 |
High octane gasoline is produced by catalytically cracking a hydrocarbon oil boiling above the gasoline range with a silica-alumina type catalyst, separating from the products an unsaturated catalytically cracked gasoline having an end B.P. of between about 82 DEG and about 121 DEG C., catalytically hydrogenating the cracked gasoline until its bromine number is reduced by between about 25 and about 95%, and blending with the partially hydrogenated gasoline at least 12% by volume based on the gasoline, of one or more saturated alkyl ethers boiling between about 31 DEG and about 82 DEG C. In addition to the catalytically cracked gasoline, the cracked products may be separated into gaseous olefin and naphtha fractions, the olefins being used to make the ethers by reaction with alcohols, e.g. methanol or isopropanol, while the naphtha fraction may be catalytically reformed, e.g. by means of a platinum-alumina-halogen catalyst in the presence of re-cycled hydrogen, and then combined with the blend of hydrogenated catalytically-cracked gasoline and the ether. Preferably the cracked naphtha is reformed to an octane number less than that of the blend. Specified ethers are isopropyl tertiary butyl, di-isopropyl, methyl isopropyl, ethyl isopropyl, methyl tertiary butyl, ethyl tertiary butyl and methyl tertiary amyl ethers, and also 4,4 - dimethyl 1,3 - dioxane. Hydrogenation of the cracked gasoline is effected using catalysts exemplified by alumina or silica-alumina as supports for oxides or sulphides of one or more of copper, cobalt, nickel, chromium, molybdenum and tungsten. |
