| abstract |
1,128,094. Conversion of isopentane to isoprene. HALCON INTERNATIONAL Inc. 20 May, 1966 [25 May, 1965], No. 22660/66. Heading C2C. [Also in Division C5] In a process scheme for yielding isoprene starting from isopentane hydroperoxide (see Division C5), the first stage involves reacting the hydroperoxide with a second reactant (e.g. an olefin, amine or unsaturated aldehyde) under conditions such that the second reactant is oxidized while the hydroperoxide is converted to t-amyl alcohol. Numerous second reactants are specified, as also are suitable reaction conditions and catalysts for each type of reactant, the following reactions occurring in specific examples (one product being t-amyl alcohol in each case):- (1) Propylene -# propylene oxide, using molybdenum naphthenate as catalyst. Byproduct methyl isopropyl ketone is hydrogenated over copper chromite catalyst to give further t-amyl alcohol. (2) Cyclohexylamine --> cyclohexanone oxime, using tetra-n-butyl titanate as catalyst. (3) Methacrolein --> methacrylic acid, using chromic oxide as catalyst. The following reactions, occurring at different stages of the process scheme, are also exemplifled:- (a) Isopentane --> isopentane hydroperoxide, using O 2 in the presence of butyl hydroperoxide. (b) Isopentene --> isopentene epoxides, using air in the presence of cobalt naphthenate. |