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Ethylene Oxychlorination over CuCl2/γ-Al2O3 Catalyst in Micro- and Milli-structured Reactors.
Vajglová, Zuzana ; Moro, A. ; Kumar, N. ; Eränen, K. ; Peurla, M. ; Peltonen, J. ; Murzin, D.Yu. ; Salmi, T.
In the microreactor, the 1,2-dichlorethane selectivities of 4.7% and 53.6% were achieved with the ethene conversions of 1.6% and 6.4%, respectively. The other important product was chloroethane. The formation of vinyl chloride by-product of 1.6% was observed only at the highest temperature 250 °C with highest ethene conversion achieved (6.4%). No other by-products were observed. In the millireactor, the 1,2-dichlorethane selectivities exceeding 96% were achieved at ethene conversions higher than 11% within the entire experimental range. Chloroethane, vinyl chloride, 1,2-dichloroethylene (trans) were formed, but only in minor amounts.
Plný tet: SKMBT_C22018100413020 -  PDF
Plný text: content.csg - PDF
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Induced Oscillatory Behaviour During 2-Methylpropene (Isobutene) Hydrogenation in a Packed Bed Microreactor.
Vajglová, Zuzana ; Stavárek, Petr ; Jiřičný, Vladimír ; Kolena, J.
This contribution focuses on the induced oscillatory behaviour observed during the continuous hydrogenation of 2MP in a packed bed microreactor. Induced reproducible oscillations have been studied using the on-line gas chromatograph (GC-FID/TCD) and a catalyst bed temperature monitoring. Effects of the temperature, thermal conductivity and space velocity on the properties of induced oscillations have been investigated in detail. The study results revealed extremely high sensitivity of the oscillatory behaviour to the heat transfer conditions in the system. Experimental tests focusing on the space velocity effect revealed a significant influence on the oscillation amplitude height and period phase length with the high reaction rate. Based on the character of the induced oscillations, they have been classified as thermo-kinetic oscillations1 as they are resulting from the interaction between the exothermic reaction, heat transfer and a reversible decrease in the catalyst activity.
Plný tet: SKMBT_C22016111814300 - PDF
Plný text: content.csg - PDF
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Hydrogenation of Isobutene in Fixed Bed Microreactor - Long Term Experiments
Vajglová, Zuzana ; Stavárek, Petr ; Křišťál, Jiří ; Kolena, J. ; Jiřičný, Vladimír
Aliphatic hydrocarbons with 4 – 5 carbon chain are very valuable starting materials for the steam cracking process. In terms of volume, the C4 and C5 fractions are the most important by-product streams from the pyrolysis of naphtha and other liquid raw materials. Total hydrogenation of C4 and C5 fraction is a way how to produce a high-quality raw material for pyrolysis, which in comparison with a simple recycle olefin (non-hydrogenated) fractions provides higher yields of ethylene and propylene and does not shorten the operating period of the pyrolysis furnaces by excessive coking1,2. For better understanding of the C4 fraction hydrogenating process, reaction kinetic study was performed in laboratory conditions. The hydrogenation of 2-methylpropene (isobutene) on platinum catalyst was investigated experimentally as a model reaction. The effort was focused on development of the methodology of kinetic data collection under the kinetic regime. To have a representative kinetic data, results reproducibility and process stability within several days on-stream was investigated.
Plný tet: SKMBT_C22014092610171 - PDF
Plný text: content.csg - PDF
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