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对四甲基氟化铵(TMAF)、四甲基氯化铵(TMAC)、四甲基溴化铵(TMAB)、四丁基氟化铵(TBAF)和四丁基氯化铵(TBAC)五种季铵盐在低浓度含氧煤层气[30%CH4+65%N2+5% O_2(mol)]中形成水合物的热力学促进作用进行了实验研究,采用恒容压力搜索法得到每种季铵盐在浓度0.17%,0.29%,0.62%,1.38%,3.5%(mol)、温度282.3~304.5 K、压力0.919~8.435 MPa条件下的水合物相平衡数据,从季铵盐浓度、季铵盐卤素离子种类及季铵盐烷基种类3个方面综合比较了5种季铵盐的热力学促进效果.结果表明,5种季铵盐均能改善煤层气水合物形成的热力学条件,最佳促进效果3.5%TBAF>0.62%TMAF>3.5%TBAC>1.38%TMAB>1.38%TMAC,季铵盐卤素离子的促进作用氟离子>氯离子或溴离子,季铵盐烷基的影响丁基>甲基.
(TMAF), tetramethyl ammonium chloride (TMAC), tetramethyl ammonium bromide (TMAB), tetrabutylammonium fluoride (TBAF) and tetrabutylammonium chloride (TBAC) Five kinds of quaternary ammonium salt in the low concentration of oxygen-containing coalbed methane [30% CH4 + 65% N2 +5% O_2 (mol)] hydrate formation in the thermodynamic role of the experimental study, using constant pressure search method to obtain each The equilibrium data of the hydrate phase of the quaternary ammonium salt under the conditions of 0.17%, 0.29%, 0.62%, 1.38%, 3.5% (mol), 282.3 ~ 304.5 K and 0.919 ~ 8.435 MPa, Ammonium halide ion species and quaternary ammonium alkyl species were compared in three aspects.The results showed that all five quaternary ammonium salts could improve the thermodynamic conditions of formation of coalbed gas hydrate and the best Promoting effect 3.5% TBAF> 0.62% TMAF> 3.5% TBAC> 1.38% TMAB> 1.38% TMAC, Quaternary Ammonium Halide Promotions Fluoride> Chloride or Bromide, Quaternary Ammonium Alkyl Effects Butyl> A base.