C8芳烃异构体在X型分子筛上的吸附平衡参数和传质系数研究

采用静态吸附法，在177 ℃、0.8 MPa条件下测定各C8芳烃异构体在Ba2+离子交换后的X型分子筛吸附剂上的吸附量，得到各C8芳烃异构体在吸附剂上的饱和吸附量和吸附平衡常数。利用脉冲实验法分别对各C8芳烃异构体在吸附剂上的吸附分离过程进行研究，得到各异构体的脉冲响应曲线，采用Aspen Plus软件对脉冲曲线进行拟合，计算各芳烃异构体的传质系数。采用以混合C8芳烃为有效吸附组分的脉冲液进行参数验证实验，将实验结果与采用Aspen Plus软件根据所得参数拟合的响应曲线进行对比，验证了所得参数的可靠性。

STUDY ON THE ADSORPTION EQUILIBRIUM PARAMETERS AND MASS TRANSFER COEFFICIENTS OF C8 AROMATIC ISOMERS ON ZEOLITE X

The saturated adsorption capacities and equilibrium constants of C8 aromatic isomers were determined through static adsorption method at 177 ℃ and 0.8 MPa,using barium exchanged X zeolite as adsorbent.The breakthrough curve of individual C8 aromatic isomer was obtained by pulse experiments.The lumped mass transfer coefficients of C8 aromatics were calculated through curve fitting by Aspen Plus software.Simulating experiments were carried out to separate p-xylene,o-xylene,m-xylene and ethylbenzene for validation.Results showed that the simulated curves of all these components were in well accordance with the data from experiments.