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     1354.  ------.  [I. G. FARBENINDUSTRIE, A. G.]  Motor Fuels.  British Patent 448,690, June 8, 1936.  Chem. Abs., vol. 30, 1936, p. 7837.

            For the production of nonknocking motor fuels, the mixture of isobutyl and higher alcohols obtained by the catalytic treatment of CO and H₂, such as described in British Patent 238,319 (abs. 75), is freed from MeOH, converted into olefins, for example, by catalytic treatment with Al₂O₃ at 300º, and the mixed olefins, as a whole or after separation into 2 or more fractions, are at least in part polymerized.  Thus, diisobutylene may be obtained by treating isobutylene with H₂SO₄ of 50-60% concentration, as described in British Patent 322,102, and triisobutylene by means of more concentrated acid, such as 70% and dimmers and trimers of isomylene, may be obtained similarly.  When the separate fractions are polymerized, the polymers may be mixed with each other or with other fuels.  Other antiknock agents as well as MeOH, higher alcohols from the MeOH synthesis, dyes, and substances that impart odor, may be added.  In an example a mixture of CO and H₂ is passed at 200 atm. and 450º-500º through a Cu-lined apparatus containing a catalyst prepared by adding ZnO to fused K₂CR₂O₇ and reducing with H₂.  The reaction product is freed from MeOH and H₂O and converted to olefins, as described above, and the mixed olefins are treated with, for example, 55% H₂SO₄ at 100º to polymerize the lower olefins, particularly the isobutylene, to dimmers and trimers or with 70% acid, which also polymerizes hexylene and heptylene to dimmer.  The products may be wholly or partly hydrogenated.