C8芳烃和对二乙苯在BaX上的吸附分离性能

Adsorption and Separation Performance of C₈ Aromatics and p-Diethylbenzene on BaX

摘要

本文系统研究了 C₈ 芳烃（PX、MX、OX、EB）和 PDEB 在两种 BaX 分子筛吸附剂 A 和 B 上的吸附分离性能。静态吸附实验测定了各组分的吸附平衡参数，包括通过拟合吸附等温线获得的饱和吸附量、吸附平衡常数和等量吸附热，以及由竞争吸附得出的相对选择性系数。分析了温度和浓度对这些参数的影响，并确定了性能更优的吸附剂。在 177 ℃ 和 0.9 MPa 条件下，其对对二甲苯的饱和吸附量达到 1.290 mol/kg。进一步开展动态脉冲实验，获得 C₈ 芳烃异构体的洗脱曲线。利用 gPROMS 模拟软件对实验曲线进行拟合，计算出各组分的传质系数约为 2.5×10⁻⁵ m/s。随后使用具有工业代表性的 C₈ 芳烃混合物进行多组分脉冲实验，以验证吸附过程参数。结果表明，实验曲线与模拟曲线吻合良好，证明了所获吸附平衡和传质参数的可靠性。

Abstract

The adsorption and separation performance of C₈ aromatics and the desorbent p-diethylbenzene on BaX zeolite were investigated. Static adsorption experiments were conducted to determine the adsorption equilibrium parameters of each component, including the saturation adsorption capacity, adsorption equilibrium constant, and isosteric heat of adsorption obtained by fitting the adsorption isotherms, as well as the relative selectivity coefficients derived from competitive adsorption. The effects of temperature and concentration on these parameters were analyzed, and the adsorbent with better performance was identified. Under 177 ℃ and 0.9 MPa, its saturation adsorption capacity forp-xylene reached 1.290 mol/kg. Dynamic pulse experiments were further carried out to obtain the elution curves of C₈ aromatic isomers. The experimental curves were fitted using the gPROMS simulation software, and the mass transfer coefficients of all components were calculated to be approximately 2.5×10⁻⁵ m/s. Multicomponent pulse experiments were then performed using an industrially representative C₈ aromatic mixture to validate the adsorption process parameters. The results showed good agreement between the experimental and simulated curves, demonstrating the reliability of the obtained adsorption equilibrium and mass transfer parameters.

关键词

C₈ 芳烃 / 对二乙苯 / 吸附分离 / 吸附平衡 / 传质系数

Key words

C₈ aromatics / p-diethylbenzene / adsorption and separation / adsorption equilibrium / mass transfer coefficient

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