5A molecular sieve chromatography column is a classic column used in gas chromatography for separating small molecule substances, especially indispensable in the following fields:
Separation of permanent gases
Separation of oxygen, nitrogen, carbon monoxide, and methane. This is the most classic application of 5A columns. It can separate these four gas baselines.
For example, air separation, analysis of dissolved gases in transformer oil, etc.
Separation of n-alkanes and isoparaffins
The molecular chain of n-alkanes is relatively straight, with a small kinetic diameter (about 4.9 Å), and can enter the 5A pore.
Heterogeneous alkanes and aromatic hydrocarbons have a large number of branched chains and cannot enter the pore channels due to their large size.
Therefore, the 5A column can selectively retain n-alkanes, thereby achieving the separation of n-alkanes from non n-alkanes, which is very important in petrochemical and fuel analysis.
Separation of other small molecule polar substances
For example: water, ammonia, carbon dioxide, argon gas, etc.
5A分子筛色谱柱是气相色谱中用于分离小分子物质的经典柱子，尤其在以下领域不可或缺：
永久性气体的分离
氧气、氮气、一氧化碳、甲烷 的分离。这是5A柱最经典的应用。它可以将这四种气体基线分离。
例如：空气分离、变压器油中溶解气体分析等。
正构烷烃与异构烷烃的分离
正构烷烃的分子链较直，动力学直径较小（约4.9Å），可以进入5A孔道。
异构烷烃和芳香烃的分子支链较多，尺寸较大，无法进入孔道。
因此，5A柱可以选择性保留正构烷烃，从而实现正构烷烃与非正构烷烃的分离，在石油化工和燃料分析中非常重要。
其他小分子极性物质的分离
如：水、氨、二氧化碳、氩气等。
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