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Study on formation mechanism of H2S by thermochemical sulfate reduction of thiolane and magnesium sulphate
WANG Xinwei1,2, MA Qiang3, HAN Chaojie4, LIN Riyi1,2
(1.College of New Energy in China University of Petroleum (East China), Qingdao 266580, China;2.Qingdao Engineering Research Center of Efficient and Clean Utilization of Fossil Energy, Qingdao 266580, China;3.China Petroleum Pipeline Engineering Company Limited, Langfang 065000, China;4.Weifang Municipal Engineering Design Research Institute Company Limited, Weifang 261061, China)
Abstract:
The formation mechanism of secondary hydrogen sulfide (H2S) in the heavy oil recovery by steam injection is still unclear and the generation path of H2S is complex. Therefore, the reaction system including thiolane (as sulfur-containing model compound of heavy oil), magnesium sulfate and water was used as the research object, and the thermal simulation experiments were carried out to explore the mechanism, path and reaction dynamics of H2S generation in the thermochemical reduction reaction. The results show that the thermochemical reduction reaction includes hydrolysis of sulfur-containing organic compounds, protonation of sulfate radical, hydrogen sulfide autocatalysis, conversion of thiosulfate to organic sulfide, pyrolysis and hydrolysis of sulfide, etc. The reaction products are mainly composed of carbonyl sulfide, thiol, thiophene and thioether sulfides, H2, CO2, H2S, MgO and hydrocarbons. Moreover, the cracking reaction and polycondensation reaction exist simultaneously in the thermochemical reduction reaction, and the reaction order of the reaction system is 0.8 with the activation energy of 28.102 kJ/mol.
Key words:  thermochemical reduction  hydrogen sulfide  thiolane  reaction dynamics