Альдольна конденсація метилпропіонату з формальдегідом на В₂О₃-Р₂О₅-WO₃/SiO₂ каталізаторах

Abstract

Aldol condensation of methyl propionate with formaldehyde in the gas phase is a perspective method of obtaining of methyl methacrylate, which is an important monomer in the chemicals industry. The development of this method, namely the search for effective catalysts for this process allows to significantly simplify the industrial production of methyl methacrylate. The aim of this paper is to study the activity of catalysts based on a mixture of boron and phosphorus oxides and promoted by tungsten oxide in the process of aldol condensation of methyl propionate with formaldehyde in the gas phase. В₂О₃-Р₂О₅-WO₃/SiO₂ catalysts containing different amounts of tungsten oxide were investigated. Methyl propionate condensation process with formaldehyde was performed at contact time of 12 s in the temperature range of 563 ‒ 683 K. Methacrylic acid was also formed during the process. It was found that the catalyst with the atomic ratio W/P 0.3 was most effective in the process. In the presence of this catalyst at 653 K total methyl methacrylate and methacrylic acid yield was 48.8 %, while their total selectivity was 49.1 %. The optimum temperature for the process was determined to be 653 K.