关于气相色谱快速分析裂解气中微量乙炔的方法研究

Study on Speediness Determining Method of Trace Acetylene in Pyrolysis Gas by Gas Chromatography

本文建立一种气相色谱快速分析裂解气中微量乙炔的方法。通过考察各类色谱柱、中心切割、柱温、流速对实验结果的影响,确定了最佳实验条件。利用中心切割技术实现裂解气中其它高含量烃类组分的切除或反吹,消除对乙炔的干扰。同时对该方法进行了精密度、准确度和最小检测限考察。方法中乙炔最小检测限为0.1 mL/m3,相对标准偏差小于2.0%,回收率都在95%~105%之间,满足标准要求。结果表明该方法是快速分析裂解气中微量乙炔的一种简单快捷、准确可靠的分析方法。

A determining method was used to analyze trace amount of acetylene in Pyrolysis Gas by injecting sample one time.The influence of all kind of column,Deans Switch,column temperature,flow rate on result determined was investigated,then decided the best experiment condition.Using Deans Switch technology to achieve cutting off or opposite blowing of hydrocarbon,clear up the interference on acetylene.the minimum limits of trace acetylene was 0.1 mL/m3.At the same time,the precision,accuracy and minimum limit of the detection method were checked.The method conformed to requirements of standard that the recoveries of all components were 95%~105%and the relative standard deviation(RSD)were all less than 2.0%.The results showed that the method was simple,speediness,accurate and reliable.