Synthesis of acrylates from methyl propionate, propionic acid and formaldehyde in the gas phase on solid catalysts

Authors

DOI:

https://doi.org/10.15587/1729-4061.2016.79429

Keywords:

methacrylic acid, methyl methacrylate, propionic acid, aldol condensation, catalyst, methyl propionate, formaldehyde

Abstract

Development of active and selective catalysts for the process of obtaining methacrylic acid and methyl methacrylate from methyl propionate, propionic acid and formaldehyde is one of important stages to industrial implementation of this process. In order to solve this problem, we designed catalysts based on oxides of boron and phosphorus that were promoted by oxides of zirconium, tungsten and bismuth with varied content of oxides. The effect of temperature was examined on the conversion of reagents, the selectivity of formation and the yield of methyl methacrylate and methacrylic acid on the created catalysts. With increasing temperature, the conversion increases, the selectivity of formation of acrylates decreases and the total yield of acrylates has the maximum. It was found that without adding methanol, the optimal catalyst by acrylates yield is the one, in which the molar ratio of the ZrO2:WO3 promoters is 0.15:0.15. The total yield of the target products at optimum temperature of 593 K is 52.3 % with the total selectivity of their formation at 96.4 % and the conversion of reagents of 54.2 %. We determined the effect of adding methanol to the reagent mixture. Adding methanol increases the ratio of products MMA/MAA, and the optimal catalyst by the total selectivity of formation of the target products is the one promoted by bismuth oxide with the molar ratio of Bi2O32О5 – 0.3, which at a temperature of 593 K provides for the selectivity of formation of acrylates of 100 % with the yield of 33 %. The maximum total single­pass yield of MMA and MAA on this catalyst at a temperature of 623 K is 51.5 %, at the total selectivity of their formation of 91.6 %. However, the share of MMA in products is lower in comparison to the catalyst, promoted by the mixture of tungsten and zirconium oxides.

Author Biographies

Nazariy Lapychak, Lviv Polytechnic National University Bandera str., 12, Lviv, Ukraine, 79013

Postgraduate student

Department of Technology of Organic Products 

Volodymyr Ivasiv, Lviv Polytechnic National University Bandera str., 12, Lviv, Ukraine, 79013

PhD

Department of Technology of Organic Products 

Roman Nebesnyi, Lviv Polytechnic National University Bandera str., 12, Lviv, Ukraine, 79013

PhD

Department of Technology of Organic Products 

Zorian Pikh, Lviv Polytechnic National University Bandera str., 12, Lviv, Ukraine, 79013

Doctor of Chemistry Science, professor

Department of Technology of Organic Products 

Iryna Shpyrka, Lviv Polytechnic National University Bandera str., 12, Lviv, Ukraine, 79013

Postgraduate student

Department of Technology of Organic Products 

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Published

2016-10-30

How to Cite

Lapychak, N., Ivasiv, V., Nebesnyi, R., Pikh, Z., & Shpyrka, I. (2016). Synthesis of acrylates from methyl propionate, propionic acid and formaldehyde in the gas phase on solid catalysts. Eastern-European Journal of Enterprise Technologies, 5(6 (83), 44–48. https://doi.org/10.15587/1729-4061.2016.79429

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Section

Technology organic and inorganic substances