The Formation Mechanism of Trimethylpentanes from Esters in Liquid Phase Alkylation of Isobutane with Butenes

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Abstract

The formation sequence of trimethylpentane (TMP) isomers during liquid phase interaction of butyltriflates and butenes with isobutene studied. In the alkylation products composition isomers of TMP share during homogeneous interaction in isobutane forms a row 2,2,4 > 2,3,4 > 2,3,3 >> 2,2,3, but in two-phase system isobutene–tryflic acid – 2,3,4 > 2,3,3 > 2,2,4 >> 2,2,3. As reaction time elongates the isomer composition approximate to composition of usual marketable product mainly owing to isomerization of 2,3,4- and 2,3,3-isomers into 2,2,4-isomer. The peculiarities of possible formation mechanisms of primary reaction products discussed. They are in the case of butenes 2,2,4- и 2,2,3-TMP, and in the case of butyltriflates – 2,3,4- и 2,3,3-TMP.

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About the authors

Е. А. Katsman

MIREA – Russian Technological University

Author for correspondence.
Email: katsman@aha.ru
Russian Federation, Moscow

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2. Fig. 1. Dependence of TMP isomer concentration on reaction time. IB : Bu = 5.5; TfOH : Bu = 0.85; T = -35°C

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3. Fig. 2. Dependence of the fraction of TMP isomers on reaction time. IB : Bu = 5.5; TfOH : Bu = 0.85; T = -35°C

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