Oxidation of the Styrene Epoxide – Hydroquinone – Copper(II) Chloride Ternary System in a Methanol Solution

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Resumo

The consumption of styrene epoxide (SE) and hydroquinone (HQ) in a ternary TrS system (SE – HQ – Cu(II)) in an oxygen atmosphere in a methanol solution was studied. Oxygen uptake by the triple system SE – HQ – CuCl2 was studied manometrically. Expression of velocity in terms of reagent concentrations V = k [Cu(II)]1 [HQ]0 [SE]0, the effective oxidation rate constant k = 1.82×105 exp(– 40 kJ mol-1/RT) s-1, (308–323) K. The mechanism of oxidation of TrS is discussed.

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Sobre autores

L. Petrov

Federal Research Center for Problems of Chemical Physics and Medical Chemistry of the Russian Academy of Sciences

Autor responsável pela correspondência
Email: plv@acp.ac.ru
Rússia, Chernogolovka

V. Solyanikov

Federal Research Center for Problems of Chemical Physics and Medical Chemistry of the Russian Academy of Sciences

Email: plv@acp.ac.ru
Rússia, Chernogolovka

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2. Fig. 1. Kinetics of transformation of the triple system ES– GC– CuCl2; experiments with the introduction of third components into the corresponding binary systems: light dots are an experiment with the introduction of ES into the dual system GC–CuCl2, dark dots are an experiment with the introduction of GC into the dual system ES–CuCl2, the moments of entry are marked with vertical arrows. Circles – ES, squares – GC, triangles – BX, diamonds – BA. Oxygen bubbling, [ES]0 = 0.69, [GC]0 = 0.031, [CuCl2] = 11.5 × 10-4 mol/L, solvent – methanol, 318 K.

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3. 2. Kinetic curves of oxygen absorption: 1 – by the triple ES – GC – CuCl2 system; 2a – by the double ES – CuCl2 system; 2b – after the introduction of hydroquinone into the double system (marked with arrow); 3a – by the double GC – CuCl2 system; 3b – after the introduction of epoxide into the double system. [EC]0 = 0.35, [GC]0 = 0.031, [CuCl2] = 5.76 ×10-4 mol/L, solvent – methanol, 323 K.

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4. 3. Kinetic curves of consumption of epoxide (1) and hydroquinone (2); accumulation curves of benzoquinone (3) and benzaldehyde (4) in a solution of the triple system ES – GC – CuCl2. Bubbling O2, [EC]0 = 0.69, [GC]0 = 0.031, [CuCl2] = 11.5 × 10-4 mol/L, solvent – methanol, 318 K.

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5. 4. Dependences of the oxidation rate of the ES–GC –CuCl2 ternary system on [CuCl2] at [EC]0 = 0.69 and [GC]0 = 0.031 mol/L (1); on [EC] at [GC]0 = 0.031 and [CuCl2] = 5.8 ×10-4 mol/ll (2). Oxygen bubbling, solvent – methanol, 318 K.

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6. Fig. 5. Dependences of the oxidation rate of the ES– GC – CuCl2 ternary system in a methanol solution (318 K) at [EC]0 = 0.69 and [CuCl2] = 5.8 × 10-4 mol/l: on [GC] (1) and on the oxygen content (vol. %) in the gas mixture at [GC]0 = 0.031 mol/L (2).

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7. 6. Determination of the oxidation activation energy of the ES – GC – CuCl2 ternary system; Arrhenius dependence of lgV on 103/T; [ES]0 = 0.69, [GC]0 = 0.031, [CuCl2] = 9.3×10-4 mol/l, solvent – methanol.

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8. Fig. 7. Kinetic curves 1-3 of benzoquinone accumulation at –CuCl2] = (2.9 ∙ 10-4, 5.8 ∙ 10-4, 11.5 ∙ 10-4 mol/l, respectively; dependence of the initial rates of accumulation of HC calculated from the tangents of the slope angles of dashed curves 1-3 on [CuCl2] (4). Oxygen bubbling, [ES]0 = 0.69, [GC]0 = 0.031, solvent – methanol, 318 K.

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