Litteris et Artibus

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Subject: search.filters.subject.catalyst

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    Synthesis of methacrylate monomers combined condensation of propionic acid and methylpropionate in the gas phase
    (Lviv Polytechnic Publishing House, 2016) Lapychak, Nazariy; Ivasiv, Volodymyr; Nebesnyi, Roman; Shatan, Anastasia-Bogdana; Lviv Polytechnic National University
    Development of active and selective catalyst for the process of obtaining methacrylate monomers 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 catalyst based on oxides of boron and phosphorus that were promoted by mixture oxides of zirconium and tungsten. 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 on the ratio of products MMA/MAA.
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    Determination of the catalytic complexes structure in the cyclohexane oxidation
    (Lviv Polytechnic Publishing House, 2015) Ivashchuk, Oleksandr; Suprun, Oleksandr; Reutskyy, Viktor; Lviv Polytechnic National University
    A spectral analysis of catalytic solutions based on cobalt naphthenate in cyclohexanone with additives of ethanol and glycine for the cyclohexane oxidation process was conducted.
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    Simultaneous methyl methacrylate and methacrylic acid obtaining over zirconium-containing catalysts
    (Lviv Polytechnic Publishing House, 2015) Nebesna, Yuliia; Nebesnyi, Roman; Ivasiv, Volodymyr; Lapychak, Nazarii; Lviv Polytechnic National University
    Methyl methacrylate and methacrylic acid are widely used monomers. The aldol condensation of methyl propionate and formaldehyde is perspective process for simultaneous obtaining of this methacrylate monomers. It was found that zirconium-containing catalysts are active in this process. The effect of zirconium content in the catalyst on methyl propionate conversion and yield of methyl methacrylate and methacrylic acid has been determined. The best catalyst for methyl propionate condensation with formaldehyde has been found.
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    Analysis of the process of obtaining methyl esters of fatty acids from waste vegetable oils
    (Lviv Polytechnic Publishing House, 2015) Kukushkina, Olena; Vasylkevich, Oleksandr; Bondarenko, Sergiy; Beznosyk, Yuriy; Kyiv Politechnic Institute
    The technological features of the process of obtaining the methyl esters of carboxylic acids from renewable materials were analyzed. The results showed that the waste vegetable oil can be used as raw material for biofuels production. However, to increase product yield and its quality technological scheme of obtaining the product correction is needed.