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.: Home > Nature and Science > 2012 > Volume 10 Number 9 > A.Y. El-Naggar1, 2*, A. M. El-Fadly1, A. A. Salem1** and M. A. Ebaid1

Carrier Gas as a new factor affecting the Separation Efficiency of Gas Chromatography: I-Using natural gas as a probe

A.Y. El-Naggar1, 2*, A. M. El-Fadly1, A. A. Salem1** and M. A. Ebaid1
1-Egyptian Petroleum Research Institute, Nasr City, Cairo, Egypt. 2-Chemistry Department, Faculty of Science, Taif University, KSA. *
Abstract :

Different carrier gases markedly affect retention times and separation efficiency of eluted gases in both gas liquid chromatography (GSC) and gas solid chromatography (GLC), the carrier gases have a pronounced effect on the retention times and efficiency of natural gas separation. In solid chromatography, carrier gases which are adsorbed to any extent occupy more active adsorption sites, reducing the net heat of adsorption of the eluted zone. The efficiency of separation of a light gas mixture is shown to depend markedly on the type and pressure of carrier gas in addition to the column temperatures. Hydrogen and helium are the preferred mobile phases in GSC giving higher efficiency of separation because of their higher thermal conductivity. Helium is the best one because of its safety to handle than hydrogen. Nitrogen is the preferred mobile phase used in FID giving high efficiency of heavy components of natural gas separation. For all different mobile phases, it is preferred to use lower sample capacity in order to obtain high efficiency of gas chromatographic separation.

Keywords :
Carrier gases, Retention times, Separation efficiency, Sample capacity, Gas liquid chromatography and Gas solid chromatography.

Date Deposited : 18 May 2016 19:46

Last Modified : 18 May 2016 19:46

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Volume 10, Number 9, - 2012 , ISSN 1545-0740

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