Experimental Investigation on Hydrothermal Reduction of Sulfates to H₂S and Organic Sulfides by Ethene

作者：Chao Han,Kangle Ding,Yan Liu,Fujia Guan,Mei Zou,Zhenzhen Yu,Yi Wu

摘要：The kinetic characteristics of alkenes involved in thermochemical sulfate reduction (TSR) have been never reported in geological literature. In this study, TSR by ethene under hydrothermal conditions was performed in the constrained simulation experiments. Typical TSR products consisted of H₂S, CO₂, mercaptans, sulfides, thiophenes derivatives and benzothiophene. The apparent activation energy <i>E</i> and apparent frequency factor <i>A</i> for TSR by ethene were determined as 76.370 kJ/mol and 4.579 s^-1, respectively. The lower activation energy for ethene involved in TSR relative to ethane suggested that the reactivity of ethene is much higher than that of ethane, in accordance with the thermodynamic analysis. Rate constants were determined experimentally using first-order kinetics extrapolate to MgSO₄ half-lives of 67.329 years - 3.053 years in deep burial diagenetic settings (120°C - 180°C). These values demonstrate that the reaction rate for TSR by ethene is extraordinarily fast in high-temperature gas reservoirs (120°C - 180°C). Consequently, the newly formed ethene from thermal cracking and TSR alteration of natural gas and/or petroleum could not survive after TSR process and were rarely detected in natural TSR reservoirs.

发文机构：Key Laboratory of Exploration Technologies for Oil and Gas Resources Shandong Provincial Key Laboratory of Depositional Mineralization & Sedimentary Mineral College of Chemistry and Environmental Engineering College of Resources and Environment College of Petroleum Engineering

关键词：ThermochemicalSulfateReduction(TSR)ETHENESimulationExperimentsThermodynamicAnalysisFirst-OrderKineticsThermochemical Sulfate Reduction (TSR)EtheneSimulation ExperimentsThermodynamic AnalysisFirst-Order Kinetics

分类号： O62[理学—有机化学]