Одержання акрилової кислоти альдольною конденсацією оцтової кислоти з формальдегідом у присутності B–P–W–V–Oх каталізаторів на мезопористих носіях
| Autor: | V. V. Sydorchuk, S. V. Khalameida, Zorian Pikh, I. I. Shpyrka, O. V. Tsymbalista, Roman Nebesnyi, K. R. Khoma |
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| Rok vydání: | 2018 |
| Předmět: | |
| Zdroj: | Науковий вісник НЛТУ України, Vol 28, Iss 6, Pp 89-92 (2018) |
| ISSN: | 2519-2477 1994-7836 |
| Popis: | The purpose of the work was to determine the influence of different mesoporous carriers: SiO2, TiO2 anatase of TiO (OH), ZrO2, SnO2-TiO2, Al2O3 on their efficiency in the process of aldol condensation of acetic acid with formaldehyde with the formation of acrilyc acid. To achieve this goal, the following tasks must be solved. Firstly, it is necessary to investigate the ability of the developed catalyst to intensify the process of acrylic acid production and to determine the optimal parameters of the process. Secondly, we should establish dependence of selectivity, yield of acrylic acid and conversion of reagents from temperature. The catalysts were prepared by impregnating the carrier with a saturated solution of the active phase components. The atomic ratio of components in catalyst B:P:(W+V) is 3:1:0.3; atomic ratio is W:V=2:3. The catalytic properties of the obtained catalysts were investigated in the reaction of aldol condensation of acetic acid with formaldehyde at the temperature range from 573 to 673 K, the contact time of 8 s with the equimolar ratio of the initial reagents. B – P–W – V–Ox catalysts that were applied on SiO2, TiO2 anatase of TiO(OH), ZrO2, SnO2-TiO2 and Al2O3 carriers with a size of pore about 10 nm showed high efficiency. At the same time, the yield of the product as well as the selectivity of its formation were different when various different carriers were used, indicating the influence of carrier nature on the catalytic properties of the carrier. The effect of the process conditions (temperature and contact time) on the parameters of condensation of acetic acid with formaldehyde has been determined. The optimum temperature for carrying out the process is 648 K and a contact time – 8 seconds. Under these conditions it was possible to achieve 49 % acrylic acid yield with a selectivity of 94 % and conversion of acetic acid 52 % using catalyst TiO2 anatase with TiO(OH). It has been demonstrated that the catalysts based on carriers with different nature and pore size near 10 nm allows acrylic acid synthesis with high yield and selectivity. The comparison of the catalytic activity of the optimal catalyst with silica gel and the TiO2 anatase carrier with TiO(OH) were shown. |
| Databáze: | OpenAIRE |
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