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Influence of hydrothermal treatment of catalysts on their effectiveness in the process of acrylic acid and methyl acrylate synthesis via oxidative condensation of methanol with acetic acid

Authors: Shpyrka, Iryna; Nebesnyi, Roman; Orobchuk, Oksana; Khalameida, Svitlana;

Influence of hydrothermal treatment of catalysts on their effectiveness in the process of acrylic acid and methyl acrylate synthesis via oxidative condensation of methanol with acetic acid

Abstract

The purpose of the work was to investigate the effect of modification of the catalyst of oxidative condensation of methanol with acetic acid on acrylic acid and methyl acrylate selectivity and yield. It was carried out hydrothermal treatment of the support - silica gel, in the temperature range of 100-250 oC in the range of 25 oC. It was investigated the effectiveness of the developed catalyst in the optimal conditions: temperature – 400 oC, reagents ratio CH3OH: CH3COOH = 1.2: 1, oxygen concentration in the oxidant stream is 90 % and contact time – 8 seconds. Physical and chemical properties of the catalysts for the process of acrylic acid and methyl acrylate synthesis by oxidative condensation of methanol with acetic acid were determined. Hydrothermal treatment of the silica gel, KSKG brand was performed and based on this treated silica gel catalytic system SiO2 / B2O3-P2O5-WO3-V2O5 with the atomic ratio of components В:Р:W:V=3:1:0,18:0,12 were prepared. The catalysts were tested in the process of acrylic acid and methyl acrylate synthesis. It has been established that the best catalyst for the process of acrylic acid and methyl acrylate synthesis is the catalyst with a HTT temperature of 150 0С (under optimum conditions the temperature of the process is 400 ºС and contact time 8 s). At this temperature, it was possible to obtain acrylic acid and methyl acrylate with 54.7 % yield, total selectivity of acrylic acid and methyl acrylate – 97.6 %, acetic acid conversion – 56.9 %. It was established that increasing of hydrothermal treatment temperature leads to increasing of pore size of the catalysts and decreasing the acrylic acid selectivity and increasing of esters (methyl acetate and methyl acrylate) selectivity

Досліджено процес одержання акрилової кислоти та метилакрилату окиснювальною конденсацією метанолу з оцтовою кислотою в газовій фазі на каталізаторі В2О3–Р2О5–WO3–V2O5/SiO2, модифікованому гідротермальним методом в інтервалі температур 100-250 °С. Встановлено вплив температури гідротермальної обробки на селективність та вихід продуктів реакції. Встановлено, що збільшення температури гідротермальної обробки супроводжується збільшенням розміру пор каталізатора, зменшенням селективності утворення акрилової кислоти та збільшенням селективності утворення естерів (метилацетату та метилакрилату). Максимальний сумарний вихід акрилатів (52,9 % за акриловою кислотою та 1,7 % за метилакрилатом) отримано на каталізаторі модифікованому при 150 °С. Гідротермальна обробка каталізатора дозволяє підвищити його ефективність у процесі сумісного одержання акрилової кислоти та метилакрилату окиснювальною конденсацією метанолу з оцтовою кислотою.

Related Organizations
Keywords

акрилова кислота, гетерогенний каталіз, окиснювальна конденсація, acrylic acid, oxidation condensation, метилакрилат, methyl acrylate, hydrothermal treatment, heterogeneous catalysis, 541.128.13, гідроторемальна обробка

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selected citations
These citations are derived from selected sources.
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
0
Average
Average
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