Gaseous catalytic condensation reaction of methyl propionate and formaldehyde in a fluidized bed reactor

Abstract

A one-step aldol condensation reaction of methyl propionate and formaldehyde to produce methyl methacrylate is a promising environmentally sustainable strategy. In this work, the aldol condensation reaction was firstly conducted in a fluidized bed reactor using different types of catalysts. Zirconium and cesium-loaded SiO 2 and Al 2 O 3 acid-base bifunctional catalysts were prepared by wetness impregnation. Experimental results demonstrated the 15 % Cs-0.05 %Zr/SiO 2 (100-200 mesh) catalyst exhibited excellent catalytic performance. The effects of the supports, reaction temperature, carrier gas flow rate, and feed rate were investigated and optimized. When the flow rate of carrier gas (N 2 ) was 280 cm 3 /min and the feed rate was 0.6 cm 3 /min, the methyl propionate conversion was 25.2 % and the methyl methacrylate selectivity could reach 86.1 %. Although the catalytic activity of the 15 %Cs-0.05 %Zr/SiO 2 catalyst dropped with reaction time on stream due to carbon deposition on the surface of catalyst, its activity was restored by a simple regeneration method.

Fe-Modified Cs–P/γ-Al2O3 Catalyst for Synthesis of Methyl Methacrylate from Methyl Propionate and Formaldehyde

“…The catalytic performance of the prepared catalyst was also compared with other reported results, which confirm the higher activity of our developed catalyst (Table S1). ,,,,, A series of characterization techniques including NH 3 -TPD, CO 2 -TPD, pyridine-FTIR, and XPS were carried out to investigate the intrinsic reason of the increased activity and to build up the potential relationship between the structure and activities in this catalytic system.…”

Effect of Different Configurations on Bubble Cutting and Process Intensification in a Micro-Structured Jet Bubble Column Using Digital Image Analysis

“…The internals, as an intrusive device, equipped in BCs have been perceived as an effective method for achieving mass transfer intensification [14][15][16]. Researchers have found that enhancing bubble coalescence and breakup processes in the liquid phase can promote mass transfer [17], and the results show that the significant crests in the mass transfer coefficient coincide with significant crests in the bubble breakup and coalescence rates.…”