Preparing High-Octane Motor Fuel Components via the Oxidation of an Industrial Isobutane Fraction

Иванов, Д. П.; Харитонов, А. С.; Pirutko, Larisa V.; Parfenov, Mikhail V.; Дубков, К. А.; Babushkin, Dmitrii E.

doi:10.1134/s2070050419040068

Cited by 1 publication

(1 citation statement)

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“…The industrial liquid phase oxidation of isobutane with dioxygen is carried out below isobutane’s critical temperature ( T c = 135 °C), generating a mixture of TBA and TBHP. − The TBHP is typically used as an oxidant for propylene epoxidation. To shift the selectivity toward TBA formation, there is interest in developing catalytic systems that can selectively decompose TBHP to TBA. ,− A variety of transition-metal based catalysts, such as Mn, , Ru, Fe, Cu, Eu, Co, and V, as well as halogenated metalloporphyrin complexes ,− have been reported for catalytic oxidation of various alkanes using dioxygen to produce oxygenated chemical precursors such as alcohols and acids.…”

Section: Introductionmentioning

confidence: 99%

Direct Tertiary Butyl Alcohol Formation via Catalytic Liquid Phase Isobutane Oxidation with Molecular Oxygen

Maiti

Snavely

Ramanathan

et al. 2023

Ind. Eng. Chem. Res.

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A safe one-pot catalytic process for directly producing tertiary butyl alcohol (TBA) from liquid-phase isobutane oxidation with oxygen is demonstrated. This is achieved by operating outside the vapor phase flammability envelope and catalytically decomposing tertiary butyl hydroperoxide (TBHP), the main product of homogeneous isobutane oxidation, at 125 °C and 35 bar. Among a dozen heterogeneous metal-based catalysts tested, amorphous MnO 2 (AMO) was found to be roughly an order of magnitude more active than supported Pd, Co, Au, and Nb-based catalysts for TBHP decomposition to TBA. As a result, high TBA/TBHP (up to 20.4) selectivity was achieved during isobutane oxidation in the presence of the AMO catalyst. The yield of gas phase C 1 products was <1% and only a minor amount of acetone was produced as a β-scission byproduct. The use of n-hydroxy phthalimide (NHPI) as an initiator was found to enhance the TBA yield. This process provides a possible low energy pathway for making isobutylene from isobutane, avoiding the energyintensive dehydrogenation and isobutane/isobutylene separation steps.

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