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Información tecnológica

On-line version ISSN 0718-0764

Abstract

LAFONT, Jennifer J; TORRES, Yudi C  and  LANS, Edineldo. Thermolysis of 4-hydroxy-3-methyl-2-butanone and analysis of solvent effects at different temperatures. Inf. tecnol. [online]. 2013, vol.24, n.3, pp.25-34. ISSN 0718-0764.  http://dx.doi.org/10.4067/S0718-07642013000300004.

The thermolysis of the compound 4-hydroxy-3-methyl-2-butanone was carried without solvent and in solution with p-xylene, toluene, benzene and dioxane, at every 5 degrees of temperatures in the range 463 to 483 K. The rate constants, the reaction order and the activation parameters were determined. Also, a thermolysis mechanism for the compound under study is proposed and the effect of the solvents is analyzed. Thermolysis was carried out in a small chemical reactor (150 ml) and the products were identified by gas chromatography coupled to mass spectrometry. The results showed that thermolysis of the compound obey a first order kinetics. According to the products (formaldehyde and 2-butanone) and to the physicochemical properties it is proposed a concerted, semi- polar six-member cyclic transition state. The thermolysis in solutions showed solvent effects, which accelerated the reaction rates.

Keywords : kinetics; thermolysis; 4-hydroxy-3-methyl-2-butanone; reaction mechanism; solvent effect.

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