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小型色谱柱具有予测连续逆流吸附的Sorbex法大规模分离单个芳烃异构体的可能性。色谱或者“脉冲试验”采用与大型装置相同的吸附剂、解吸剂和原料。脉冲试验得到的组份分离纯度虽然不合分析标准,但已满足了对选择性的估价。在液相色谱上产生的瞬时浓度分布和实验室规模连续的Sorbex柱上建立的稳态浓度分布十分相似。没有打算进一步探索两种分离法之间更密切的关系,然而本文指出了与吸附平衡、轴向混合和传质速率有关的脉冲试验曲线的特征,由此可评价连续操作成功的可能性。并以对二甲苯,乙苯、对异丙基甲苯和对二异丙苯四种异构体的分离为例。比较了脉冲试验和Sorbex的行为。在实验室Sorbex装置上,四种产品纯度都达到99％,收率在90％以上。
Small columns have the potential of large-scale separation of individual aromatic isomers by the Sorbex method, which predicts continuous counter-current adsorption. Chromatography or “pulse testing” uses the same sorbents, desorbing agents and raw materials as large units. Although the separation purity of the components obtained by the pulse test does not meet the analytical standard, the selectivity evaluation has been satisfied. The instantaneous concentration profiles produced on the LC are very similar to the steady state concentration profiles established on a lab scale continuous Sorbex column. There is no intention to further explore the closer relationship between the two separations, but the characteristics of the pulsed test curves related to adsorption equilibrium, axial mixing and mass transfer rates are pointed out here, whereby the likelihood of success of continuous operation can be assessed. Taking the separation of four isomers of p-xylene, ethylbenzene, p-cymene and p-diisopropylbenzene, for example. The pulse test and Sorbex behavior were compared. On the Sorbex unit, all four products are 99% pure, yielding over 90%.