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Halligudi, S.B.; Devassy, Biju M.; Raj, N.K. Kala; Degaonkar, M P; Gopínathan, Sarada

doi:10.1023/a:1010375126176

Cited by 10 publications

(4 citation statements)

References 2 publications

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“…At a proposed reaction pathway from our experiments, the main path of the products was considered to be especially significant because these products are applied to sources of industrial processes. − This reaction pathway would incorporate the effect of process variables into the maximum formation of the desired products.…”

Section: Resultsmentioning

confidence: 99%

“…Therefore, we undertake the study of synthetic organic oxidations such as the selective oxidation pathway of alkyl aromatic compounds in sub- and supercritical water using hydrogen peroxide as the oxidant. The previous studies of the partial oxidation of p -xylene were used in the catalysis and specified the mechanism from their reaction. − However, the uncatalyzed partial oxidation of p -xylene in sub- and supercritical water has not been reported yet. This work is the first attempt at developing a detailed pathway for the sub- and supercritical water of the complex, the decomposition of p -xylene.…”

Section: Introductionmentioning

confidence: 99%

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Reaction Pathway and Kinetics for Uncatalyzed Partial Oxidation of p-Xylene in Sub- and Supercritical Water

Kim

Lim

et al. 2002

Ind. Eng. Chem. Res.

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In sub-and supercritical water, partial oxidation of p-xylene was performed by the batch reactor without a catalyst at the conditions of 240-400°C and 220-300 bar. The loaded amount of hydrogen peroxide was set to 21-100% of the stoichiometric requirements for oxygen. Conversion of p-xylene was reached over about 89.02% (in subcritical conditions) and over 99% (in supercritical conditions) within 20 min. In sub-and supercritical water, we proposed a simplified reaction pathway in parallel and the possible reaction mechanism from major products that consist of p-tolualdehyde, p-toluic acid, terephthalic acid, 4-carboxybenzaldehyde, toluene, and benzaldehyde. The yield of major products in subcritical condition was higher than that of major products in supercritical condition. The values of rate constants and activation energy were determined. The overall rates of p-xylene were divided into two equations. Also, the kinetic constants obtained from a simplified reaction pathway showed good agreement with experimental results.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Reaction Pathway and Kinetics for Uncatalyzed Partial Oxidation of p-Xylene in Sub- and Supercritical Water

Kim

Lim

et al. 2002

Ind. Eng. Chem. Res.

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“…Among the various transition metal complexes reported [9][10][11][12][13][14][15][16][17], the amino acid Schiff base complexes have been proven to be excellent catalysts for catalytic epoxidation [13,14]. However, such homogeneous complexes suffer from the drawbacks of poor catalyst recovery and product separation [18].…”

Section: Introductionmentioning

confidence: 99%

Epoxidation of Styrene with H2O2 Catalyzed by Alanine–Salicylaldehyde Schiff Base Chromium (III) Complexes Immobilized on Mesoporous Materials

Wang

Wei

et al. 2010

Catal Lett

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Alanine-salicylaldehyde Schiff base chromium (III) complex was immobilized on mesoporous silica gel (SiO 2 ), MCM-41 and SBA-15. The resulting immobilized complexes were promising catalysts for the epoxidation of styrene with 30% hydrogen peroxide, and they all showed much higher catalytic performance than their homogeneous analogue. Simultaneously, the catalytic performance of immobilized complexes was found to be closely related to the textual and surface properties of the supports used. The complex immobilized on methyl-containing MCM-41 exhibited the highest catalytic performance. Under optimal reaction conditions, the highest conversion of styrene reached 80.2% with 77.0% selectivity to epoxide. In addition, the catalytic performance remained stable after six times of recycling.

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“…However, because of the environmental issues associated with the production of large volume chemicals and the corrosive nature of the byproducts above the catalyst system, many researchers have been working hard to develop high efficiency and selectivity catalysts for the oxidation of p-xylene to p-toluic acid and to achieve environmentally friendly and high-economy processes. To the best of our knowledge, previous studies on Schiff base complexes, especially the one substituted with aza-crown ether Schiff base complexes as catalyst in the aerobic oxidation of p-xylene to p-toluic acid, are infrequent [7,8]. Crown ether rings endow special performance and characteristics due to the hydrophobicity of the outer ethylene groups and orderly arrangement of the inner oxygen atoms [9,10].…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Study of Mono-Schiff Base MnIII Complexes with Aza-crown or Morpholino Pendant as Catalyst in Aerobic Oxidation of p-xylene to p-toluic Acid

Yan

et al. 2006

Transition Met Chem

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Novel mono-Schiff base Mn III complexes with pendant aza-crown or morpholino groups have been synthesized and studied as catalysts in aerobic oxidation of p-xylene to p-toluic acid. The oxidation of p-xylene to p-toluic acid with air at 120°C under normal atmospheric pressure occured efficiently in the presence of aza-crown ether substituted mono-Schiff base Mn III complexes. Significant selectivity (up to $ 90%) and conversion levels (up to $ 38%) were obtained. The effect of the aza-crown ether pendant in Mn III Schiff base complexes on the oxidation of p-xylene was also investigated by comparison with the morpholino pendant analogues. The addition of alkali metal ions accelerated the rate of conversion of p-xylene to p-toluic acid.

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Cited by 10 publications

References 2 publications

Reaction Pathway and Kinetics for Uncatalyzed Partial Oxidation of p-Xylene in Sub- and Supercritical Water

Reaction Pathway and Kinetics for Uncatalyzed Partial Oxidation of p-Xylene in Sub- and Supercritical Water

Epoxidation of Styrene with H2O2 Catalyzed by Alanine–Salicylaldehyde Schiff Base Chromium (III) Complexes Immobilized on Mesoporous Materials

Synthesis and Study of Mono-Schiff Base MnIII Complexes with Aza-crown or Morpholino Pendant as Catalyst in Aerobic Oxidation of p-xylene to p-toluic Acid

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