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提出一种用微反应色谱法研究甲醇气相脱水制备二甲醚的色谱分析流程 ,避免通常必须对反应产物中的易凝结的组分进行冷凝然后另行分析 ,在流程中连续分析同时得到气相和液相组分的定量数据 ,实现在线实时分析 .流程首先用一个色谱柱将甲醇脱水产物中的水、甲醇、乙醇完全分离并与其他组分分开 ,在氢化钙转化反应器中 ,将已经分离的水、甲醇、乙醇依次转化成氢 ,用热导检测器测定 .在串接的第 2个色谱柱中实现其它组分的分离 ,并将其中的CO和 CO2 在加氢转化柱上转化成甲烷 .第 2色谱柱分离的组分用氢火焰离子化检测器测定 .两个色谱柱和两个检测器的分析结果组成完整的甲醇催化脱水产物的色谱图 ,得到满意的定量分析结果
A method for the chromatographic analysis of dimethyl ether by gas-phase dehydration of methanol was proposed by using microreaction chromatography. It is generally avoided to condense the easily-condensed components of the reaction product and then analyze it separately. Continuous analysis in the process gives both the gas phase and the liquid Phase quantitative data for online real-time analysis.First, a column of methanol dehydration products of water, methanol, ethanol and complete separation and other components in the calcium hydride conversion reactor, will have been separated Water, methanol and ethanol are converted to hydrogen in turn, and measured by a thermal conductivity detector. The other components are separated in the second column connected in series, and the CO and CO2 therein are converted on a hydroconversion column to methane The components separated on Column 2 were determined by a flame ionization detector.The results of the two columns and the two detectors formed a complete chromatogram of the methanol-catalyzed dehydration product, yielding a satisfactory quantitative analysis