Özet:

The article deals with issues related to preparation of acrylate monomers through aldol condensation. Earlier considered aldol condensation process of methyl propionate with formaldehyde in the gas phase on solid catalysts has high conversion, but its disadvantage is significant methyl propionate hydrolysis to propionic acid and methanol. To address this disadvantage it is proposed to obtain methyl methacrylate and methacrylic acid by the combined aldol condensation of methyl propionate and proponic acid with formaldehyde. As a result of researches high selective catalytic systems based on oxides B2O3 and P2O5 is developed. In particular, on the B2O3-P2O5-Bi2O3-SrO/SiO2 catalyst 100 % selectivity was achieved at 563 K. The effect of temperature changes on the aldol condensation process of methyl propionate and propionic acid with formaldehyde is determined and the optimal conditions of the procedure are established. An optimal release of methyl methacrylate and methacrylic acid catalyst is B2O3-P2O5-Bi2O3-WO3/SiO2, where the total release for one run is 55,2 %, while the total selectivity of their formation is 97,5 % and the conversion of methyl propionate and propionic acid is 56,6 % The proposed method allows receiving two valuable products at one stage and eliminating methyl propionate hydrolysis, increasing the competitiveness of products receiving by such method. The developed catalysts ensure efficient use of raw materials due to the high selectivity of formation of desired products. Author Biographies Назарій Ігорович Лапичак, Lviv Polytechnic National University, str. S. Bandery, 12, Lviv, Ukraine, 79013 PhD student Department of Technology of Organic Products 

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