Thermoanalytical Study of O,O'-dibenzoyl-(2R, 3R)-Tartaric Acid SMC |
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| Authors: | Simon H Vincze Z Marthi K Lévai G Pokol G Fogassy E Kozma D |
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| Institution: | (1) Department of Organic Chemical Technology, Budapest University of Technology and Economics, Budapest, Műegyetem rkp. 3, P.O. Box 91, H-1521, Hungary;(2) Research Group for Technical Analytical Chemistry, Hungarian Academy of Sciences, Budapest University of Technology and Economics, Budapest, Szt. Gellért tér 4, H-1521, Hungary;(3) Institute of General and Analytical Chemistry, Budapest University of Technology and Economics, Budapest, Szt. Gellért tér 4, H-1521, Hungary |
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| Abstract: | A non-isothermal experimental study using thermogravimetry (TG) and differential scanning calorimetry (DSC) was conducted
for investigation the oxidation reactivity of natural phosphate and its demineralised products. The analyses were carried
out in oxygen atmosphere and at different heating rate (5, 10, 20, 30, 50, 60°C min-1) up to 1000°C. The results indicated that the material washed with HCl from the original phosphate, mainly apatite and carbonates
of calcium and magnesium, as well as with HCl/HF, silicates minreals, had an inhibition effect during oxidation reactions
of organic material. The increase of the heating rate shifted the reactions to higher temperatures. In addition, kinetic parameters
were determined by assuming a single first-order kinetic model, using the Coats-Redfern method. The influences of demineralization
process of natural phosphate and the heating rate were examined and discussed.
This revised version was published online in August 2006 with corrections to the Cover Date. |
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| Keywords: | enantiomer separation O'-dibenzoyl-(2R enantioselectivity 3R)-tartaric acid complex formation optical resolution O |
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