摘要:
研究了挥发性化合物(VOCs)甲苯与典型阳离子表面活性剂十六烷基三甲基溴化铵(CTMAB)溶液间气液平衡关系.结果表明,CTMAB对甲苯气液平衡影响显著,可明显降低甲苯表观亨利系数(Hc),抑制甲苯挥发;Hc随CTMAB浓度的增加而降低,CTMAB浓度XX缓慢减小,抑制甲苯挥发能力相对较弱;X>CMC时,亨利系数随X降低较快,抑制甲苯挥发能力较强.推导并验证了Hc与X之间定量关系式:Hc=H/(1+K(X-CMC)),Hc计算值与实验值间相关系数R=0.91.温度对Hc影响显著,Hc随温度(T)的升高而增大,Hc与1/T呈线性关系.
Abstract:
Effect of typical cation surfactant,cetyltrimethyl ammonium bromide(CTMAB),on the accurate relation of the vapor-liquid partitioning of volatile organic compounds(VOCs)——toluene was studied. The results showed that vapor-liquid equilibrium of toluene changed obviously and the apparent Henry,s constant(Hc)reduced significantly with CTMAB concentrations. The Hc decreased with increasing CTMAB concentrations. The Hc changed slowly and the restraining ability of CTMAB was weaker below the CMC of CTMAB. While the CTMAB concentrations exceeded its CMC,the Hc changed rapidly and the restraining ability of CTMAB was stronger. The relationship between Hc and X was validated through the equation:Hc=H/(1+K(X-CMC)),the value of the correlation coefficient was 0.91 between the calculated and determined values of Hc,which indicated that the relationship between Hc and X were described well by the equation. Influence of temperature on Hc was obvious. When the temperature increased,following the Hc enhanced,and there was well linear relationship between Hc and 1/T.
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