Apparent Kinetic Model of Hydrogenation for Removal of Olefin Impurities from Alkylation Reactor Effluent Mixture

Abstract

The apparent kinetic model of the hydrogenation of the alkylation reactor effluent mixture for removal of olefin impurities was studied. Hydrogenation experiments over Pd/Al 2 O 3 catalyst were carried out. On the basis of reactor phase structure, the characteristic equation of the reactor was determined. The apparent kinetic model equation of olefin conversion was determined. By thermodynamic analysis, the mathematical models of the hydrogen solubility coefficient and hydrogen solubility were determined through the correlation of hydrogen solubility coefficient with temperature and the molar mass of the liquid medium. The apparent kinetic model of olefin hydrogenation was established through model parameter estimation. The order of hydrogen concentration in liquid was close to 1, and the order of olefin was significantly higher than that of hydrogen. The olefin concentration had greater influence on the hydrogenation reaction rate than hydrogen. There was an hydrogenation activity distribution of olefin mixture. The results of the experimental validation and statistical test showed that the established kinetic model had higher simulation accuracy. The hydrogenation conditions were predicted by the reaction kinetics model. With the decrease of required bromine index of linear alkylbenzene, corresponding hydrogenation conditions needed to be intensified. In the range of the bromine index of hydrogenation feedstock from 100 to 600 mgBr/100 g, the bromine index for linear alkyl benzene should be below 10 mgBr/100 g through hydrogenation under the conditions of 90 °C, 4.0 MPa, and weight hourly space velocity of 0.5 h −1 .

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