不饱和水蒸气条件下MgSO_4氧化天然气反应研究

Study on the Oxidation of Natural Gas over Magnesium Sulfate in Unsaturated Water Vapor

在高温高压不饱和水蒸气条件下对MgSO4氧化天然气反应进行了等温实验研究,利用微库仑仪、气相色谱、红外光谱和x射线衍射仪等仪器对反应产物进行了分析,探讨了硫酸盐热化学还原反应(TSR)的反应机理。结果表明,MgSO4氧化天然气反应主要生成MgO、H2S、CO2及焦炭等产物。当反应温度逐渐升高时,C2以上烷烃含量逐渐减少,甲烷及一些中间产物如乙烯、丙烯、H2、CO在天然气中的比例逐渐增大。天然气总烃含量随H2S及CO2等酸性气体含量的增加而呈递减趋势。反应机理研究表明,温度与烷烃碳链长度是影响TSR进行程度的两个重要因素。

Isothermal experiments on the oxidation of natural gas over magnesium sulfate have been conducted in unsaturated water vapor at elevated temperatures and pressures. Properties of the reaction products were analyzed by microcoulometry, gas-chromatography, fourier transform-infrared spectrometry and X-ray powder diffraction methods. The reaction mechanism of thermochemical sulfate reduction ( TSR) was discussed tentatively. The results showed that magnesium oxide, hydrogen sulfide, carbon dioxide and carbon were the main products of the reaction between magnesium sulfate and natural gas. With increasing temperatures, C2-C6 hydrocarbon gases were decreasing, and the ratios of CH4 and some intermediates such as alkenes, H2 and CO in the gas composition were increasing. The decrease in the total hydrocarbon gases/natural gas ratio was accompanied by the increase of H2S and CO2 contents. According to the proposed reaction mechanism, temperature and carbon chain length may be the two main factors that influence the TSR process.