The study of technological and kinetic regularities of simultaneous methacrylates obtaining over zirconium-containing catalysts
DOI:
https://doi.org/10.15587/1729-4061.2015.51348Keywords:
methacrylic acid, methyl methacrylate, zirconium oxide, aldol condensation, catalyst, methyl propionate, formaldehydeAbstract
The development of active and selective catalysts for the process of methacrylates obtaining by aldol condensation of methyl propionate with formaldehyde is a key issue on the way to industrial implementation of said process. To solve this problem, a catalyst based on boron and phosphorus oxides was promoted by zirconium oxide. The effect of temperature and zirconium oxide content in B2O3-P2O5-ZrO2/SiO2 catalysts on methyl propionate conversion, methyl methacrylate and methacrylic acid selectivity and yield has been investigated. It was found that the promoter content in the catalyst does not significantly affect the conversion of saturated ester, but conversion significantly increases with the temperature increasing. The highest yield and selectivity of methyl methacrylate and methacrylic acid were at the temperature of 623 K in the presence of a catalyst, wherein the molar ratio of ZrO2/P2O5 was 0.3. Over this catalyst at 623 K total yield of methacrylate monomers was 63.2 % while their total selectivity was 65.4 % and conversion of methyl propionate was 96.6 %. The basic kinetic regularities of simultaneous methacrylates obtaining were determined over the best catalyst.
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Copyright (c) 2015 Roman Nebesnyi, Юлія Віталіївна Небесна, Володимир Васильович Івасів
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