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以二乙基苯为代表,通过详细的热力学计算,探讨了不同反应条件对二乙苯与苯烷基转移反应平衡的影响。研究表明,反应温度对热力学平衡的影响不大,但是对动力学的影响很明显。通过提高催化剂活性,降低二乙苯与苯烷基转移的反应温度,可抑制烷基C—C键的裂解,减少生成副产物甲苯、二甲苯等,有利于提高乙苯质量。此外,提高苯/二乙苯的摩尔比,有利于抑制二甲苯生成,尤其是低温下反应受动力学控制时,能大幅度提高乙苯平衡产率。
Taking diethylbenzene as representative, the influence of different reaction conditions on the equilibrium of diethylbenzene and benzene transalkylation was discussed through detailed thermodynamic calculation. The results show that the reaction temperature has little effect on the thermodynamic equilibrium, but the effect on the kinetics is obvious. By increasing the activity of the catalyst and decreasing the reaction temperature of the diethylbenzene and the alkyl transalkylation, cracking of the alkyl C-C bond can be suppressed, and by-products such as toluene and xylene can be reduced, thereby improving the quality of the ethylbenzene. In addition, increasing the molar ratio of benzene / diethylbenzene helps to inhibit xylene generation, especially when the reaction is controlled by kinetics at low temperature, which can greatly improve the equilibrium yield of ethylbenzene.