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Experimental investigation of liquid chromatography columns by means of computed tomography

机译：电脑层析层析层析柱的实验研究

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The efficiency of packed chromatographic columns was investigated experimentally by means of computed tomography (CT) techniques.The measurements were carried out by monitoring tracer fronts in situ inside the chromatographic columns.The experimental results were fitted using the equilibrium dispersive model (EDM) and varying the so called apparent axial dispersion coefficient.The additivity of the first and second central moments was exploited to estimate column efficiency in different regions of the column.The results showed that the columns under investigation offered a higher column efficiency in the centre compared to the wall region.Furthermore the void fraction in the vicinity of the walls was lower than that in the column core.For this reason the bands were conveyed faster in the central region of the column where the permeability was higher.This result is in good agreement with earlier findings.
机译：通过计算机断层扫描（CT）技术对填充色谱柱的效率进行了实验研究，通过监测色谱柱内部的示踪剂前沿进行了测量，并使用平衡色散模型（EDM）拟合了实验结果并进行了变化利用第一和第二中心矩的相加性来估计柱在不同区域的柱效。结果表明，与墙相比，所研究的柱在中心提供了更高的柱效。此外，壁附近的空隙率低于柱芯的空隙率，因此，在渗透率较高的柱中心区域，能带的传输速度更快，这一结果与早期发现。

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