原油中有机硫化物成因的硫酸盐热化学还原反应模拟研究
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摘要: 原油中部分有机硫化物来源于硫酸盐热化学还原反应。利用高压釜在高温高压含水条件下对正戊烷硫酸镁反应体系进行了热模拟实验研究。通过气相色谱仪、微库仑仪、毛细管气相色谱/脉冲火焰光度检测器、红外光谱仪及X射线衍射仪，对气、油、固三相产物进行了分析。结果表明，硫酸盐热化学还原反应在425℃~525℃可以进行，主要生成氧化镁、炭、硫化氢、二氧化碳以及硫醇、硫醚和噻吩类等有机硫化物。根据动力学模型计算出该反应活化能为58.0kJ/mol。Abstract: Thermochemical reduction of magnesium sulphate with npentane was carried out in an autoclave in the presence of water at high temperature and pressure to simulate the origination of organic sulfur compounds in petroleum from thermochemical sulphate reduction (TSR). The products of 3 phases (gas, oil, and solid) were analyzed by some advanced analytical methods including gas chromatography, microcoulometry, FTIR, and Xray diffraction. The results show that the TSR reaction occurred at 425℃~525℃ with MgO, C, H2S, CO2, and a series of organic sulfur compounds such as mercaptans, sulfoethers, and thiophenes as the main products. The reaction kinetics was studied and the calculated activation energy is 58.0kJ/mol.
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