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Determination of Natural Gas Components by Gas Chromatographic Multicolumn System
Analytical Science and Technology / Analytical Science and Technology, (P)1225-0163; (E)2288-8985
1994, v.7 no.3, pp.339-347
Choi,
Y., &
Choe,
K.
(1994). Determination of Natural Gas Components by Gas Chromatographic Multicolumn System. Analytical Science and Technology, 7(3), 339-347.
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Abstract
A multicolumn system consisted of two valve(10-port and 6-port valve)-three column (28% DC 200, SP 1700 and Chromosorb 102 column) was developed. Nine natural gas components composed of <TEX>$N_2$</TEX>, <TEX>$CH_4$</TEX>, <TEX>$CO_2$</TEX>, <TEX>$C_2H_6$</TEX>, <TEX>$C_3H_8$</TEX>, <TEX>$i-C_4H_{10}$</TEX>, <TEX>$n-C_4H_{10}$</TEX>, <TEX>$i-C_5H_{12}$</TEX> 및 <TEX>$n-C_5H_{12}$</TEX> completed all the baseline separation within 18 minutes. The accuracy and the precision of this system was tested. The retention times and the peak areas were determined with a repeatability between 0.02 and 0.16%, and less than 1%, respectively. Calibration curves for natural-gas components were plotted by the partial pressure injection method of pure gases, and good linear relationships for each component were presented. By using these calibration curves the accuracy of the multicolumn system compaired with that of the single column system for a certified standard gas of natural gas. As a result, relative error in the single and the multicolumn system was less than 0.5% and 0.04%, respectively. The result of application of this system in the analysis of importing LNG composition showed that the heating values calculated by the multicolum system were estimated lower compared with those calculated by the single column system and consequently, the importing price of LNG was able to be cut down.
- keywords
- Multicolumn system, the heating value of natural gas
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