Kinetics of the Transesterification of Castor Oil with Maleic Anhydride Using Conventional and Microwave Heating

Studies of the catalytic oxidation of benzene to maleic anhydride and carbon dioxide over vanadia/molybdena catalysts show that the major part of the reaction involves interacting gas and gas-solid processes. The results are consistent with a mechanism in which a benzeneoxygen adduct is formed catalytically, desorbs and then reacts to give maleic anhydride entirely in the gas phase. On the basis of this proposed mechanism, the kinetics of individual reactions have been investigated in some depth. The over-oxidation of maleic anhydride has been found to be not significant under the conditions of reaction. The kinetic relationships governing the homogeneous decomposition of the adduct and the oxidation of the adduct to maleic anhydride and to carbon dioxide have been established. The results show that essentially all of the anhydride originates from mixed gas-solid/gas reaction while substantial amounts of carbon dioxide are produced entirely catalytically.

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Comparative analyses on isothermal kinetics of water evaporation and PAAG hydrogel dehydration under the microwave heating conditions

Chemical Engineering Research and Design ◽

10.1016/j.cherd.2017.04.009 ◽

2017 ◽

Vol 122 ◽

pp. 113-120 ◽

Cited By ~ 3

Author(s):

B. Adnadjević ◽

M. Gigov ◽

J. Jovanović

Keyword(s):

Microwave Heating ◽

Isothermal Kinetics ◽

Water Evaporation ◽

Comparative Analyses ◽

Kinetics Of

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Recycling of waste poly(ethylene terephthalate) with castor oil using microwave heating

Polymer Degradation and Stability ◽

10.1016/j.polymdegradstab.2013.08.019 ◽

2013 ◽

Vol 98 (11) ◽

pp. 2232-2243 ◽

Cited By ~ 21

Author(s):

Hynek Beneš ◽

Jitka Slabá ◽

Zuzana Walterová ◽

David Rais

Keyword(s):

Microwave Heating ◽

Castor Oil ◽

Ethylene Terephthalate ◽

Poly Ethylene Terephthalate ◽

Poly Ethylene

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The kinetics of the esterification reaction between castor oil and oleic acid

Journal of the American Oil Chemists Society ◽

10.1007/bf02662283 ◽

1991 ◽

Vol 68 (9) ◽

pp. 639-641 ◽

Cited By ~ 11

Author(s):

A. T. Erciyes ◽

L. Dandik ◽

O. S. Kabasakal

Keyword(s):

Oleic Acid ◽

Castor Oil ◽

Esterification Reaction ◽

Kinetics Of

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Comparative kinetics of the alkali-catalyzed sunflower oil methanolysis with co-solvent under conventional and microwave heating with controlled cooling

Green Processing and Synthesis ◽

10.1515/gps-2017-0038 ◽

2018 ◽

Vol 7 (5) ◽

pp. 441-452

Author(s):

Biljana B. Beljic Durkovic ◽

Jelena D. Jovanovic ◽

Borivoj K. Adnadjevic

Keyword(s):

Microwave Heating ◽

Sunflower Oil ◽

Conventional Heating ◽

Controlled Cooling ◽

Pseudo First Order Reaction ◽

Reaction Rate Constants ◽

Cooling Conditions ◽

Exponential Factors ◽

The Impact ◽

Kinetics Of

Abstract The kinetics of the alkali-catalyzed transesterification of sunflower oil with methanol in the presence of co-solvent (TSMPC) were investigated. The kinetics curves of the alkali-catalyzed TSMPC, in the temperature range of 26°C–55°C, were measured for conventional heating (CH) and microwave heating with controlled cooling. The results showed that for both heating modes, the kinetics of the alkali-catalyzed TSMPC reaction can be described with the kinetic model of the pseudo first-order reaction with respect to the concentration of the triglycerides. The values of apparent reaction rate constants, activation energies, and pre-exponential factors are also calculated. The existence of a linear correlation (compensation effect) between the values of apparent kinetic parameters determined for CH and microwave heating with controlled cooling conditions is established. The results confirmed that the increase in the transesterification rate in the microwave heating with controlled cooling conditions is not caused by overheating nor by the existence of hotspots. The model of mechanism of the impact of microwave heating on the kinetics of transesterification is hereby proposed.

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