噻吩水热裂解生成H_2S实验研究

Study on the formation mechanisms of H_2S by aquathermolysis of thiophene

针对注气热采过程生成硫化氢(H_2S)现象,以稠油中公认的含硫模型化合物噻吩及5种金属盐(AlCl_3,CaCl_2,MgCl_2,NiCl_2,ZnCl_2)为研究对象,开展热模拟实验探究噻吩水热裂解生成H_2S机理。实验表明:(1)金属盐可有效降低反应活化能,促进H_2S的生成;金属阳离子电荷数决定水热裂解反应的难易程度,电荷数越多,反应越容易进行,即金属离子对噻吩催化顺序为Al^(3+)> Ni^(2+)> Mg^(2+)> Ca^(2+)> Zn^(2+);(2)金属盐的浓度决定反应的快慢程度,金属离子浓度越高,反应速率越快;(3)对无金属盐及AlCl_3,NiCl_2,MgCl_2,CaCl_2,ZnCl_26种反应体系反应动力学进行研究,通过动力学参数对金属盐催化效果进行验证并得到不同反应体系的反应动力学参数。无金属盐及AlCl_3,NiCl_2,MgCl_2,CaCl_2,ZnCl_26种反应体系的反应活化能依次为:57. 31,17. 18,22. 33,24. 38,25. 18,32. 79 kJ/mol。

On the basis of H2S formation during gas injection and heat removal,the thiophene and 5 kinds of metal salts i (AlCl3,CaCl2,MgCl2,NiCl2,ZnCl2)of heavy oil containing sulfur model compounds are studied.The thermal simulation of thiophene is performed to study the mechanisms of the formation of H2S in thiophene aquathermolysis.The tests demonstrate that:(1)the addition of metal salts can effectively reduce the activation energy of the reaction and promote the formation of H2S ;The quantity of metal cation charges determines the difficulty of the hydrothermal cracking reaction.The more the charge number is,the easier the reaction is.That is,the catalytic order of rectalions for thiophene is Al3^+>'Ni2^+>Mg2^+>Ca2^+>Zn2^+.(2)The concentration of metal salt determines the degree of reaction.The higher the concentration of metal ions is,the faster the reaction rate.(3)The reaction kinetics of metal salt and AlCl3,NiCl2,MgCl2,CaCl2, ZnCl2 reaction system were investigated.The catalytic effect of metal salt was verified by kinetic parameters and the reaction kinetics parameters of different reaction systems were obtained.The reaction activation energies of the six reaction systems are in the order of 57.31 kJ/mol,17.18 kJ/mol,22.33 kJ/mol,24.38 kJ/mol,25.18 kJ/mol and 32.79 kJ/mol respectively.