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Revista de Chimie (Rev. Chim.), Year 2014, Volume 65, Issue 5,





EMIL-FLORIN TUTA, GRIGORE BOZGA
A Kinetic Study of the Liquid Phase 2-ethyl-2-hexenal
Hydrogenation over Ni-Cu/silica Catalyst

Abstract:

The hydrogenation of 2-ethyl-2-hexenal represents the last chemical step of the industrial process for synthesis of 2-ethylhexanol, an important commercial alcohol. The paper presents an experimental study of the liquid phase 2-ethyl-2-hexenal hydrogenation to 2-ethylhexanol over a commercial Ni/Cu - silica supported catalyst. The tests were performed in a laboratory autoclave, at typical conditions for the industrial process: reactant concentrations up to 30 % (wt), temperatures between 120 and 140 oC, pressures in the interval 12 - 35 bar and reactant (2-ethyl-2-hexenal) to catalyst weight ratios of 18 to 35. The results are evidencing a much higher rate of unsaturated ]C=C[ bond hydrogenation as compared with the hydrogenation of intermediary saturated aldehyde to alcohol. The rates of the two reactions were correlated to composition and temperature, by a power-law model. Keywords: hydrogenation, 2-ethyl-2-hexenal, nickel-copper catalyst, batch experiments, kinetic model


Issue: 2014, Volume 65, Issue 5
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