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Determination of Low Level Hydrocarbon Impurities in Ethylene Using the Agilent 6820 Gas Chromatograph

Abstract: A method for analyzing trace hydrocarbon impurities in ethylene is described. The method employs an Agilent 6820 gas chromatography (GC) system configured with a gas sampling valve, split/splitless inlet, and flame ionization detector. The Agilent Cerity Networked Data System for Chemical QA/QC was used to control the 6820 GC and to provide data acquisition and data analysis. An Agilent PLOT Al2O3 megabore column was used for separation of the trace hydrocarbons. Impurity levels at about 15 ppm were easily detected in ethylene. This method does not determine all possible impurities such as CO, CO2, H2O, alcohols, nitrogen oxides and carbonyl sulfide, nor hydrocarbons larger than decane.

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