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用修正的E-L模型描述二元VOCs气体在活性炭上的吸附平衡

Keywords: VOCs,吸附,置换现象,亲和系数,E-L模型

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Abstract:

对不同VOCs气体二元吸附平衡进行了研究。结果表明,对于甲苯-苯、甲苯-乙酸乙酯、甲苯-丙酮、丙酮-乙酸乙酯及苯-丙酮二元吸附体系,吸附过程存在置换现象,即随着高沸点组分在床层内吸附量的逐渐增加,相对挥发性大的低沸点组分更易脱附,出现高沸点组分置换低沸点组分的现象,表现为被置换组分的穿透曲线上出现峰值;但对于苯-乙酸乙酯二元体系,由于沸点相近,吸附过程没有明显的置换现象。将活性炭对吸附质吸附量的大小与亲和系数相关联,通过引入抑制因子建立了修正的E-L模型,该模型对不同VOCs二元体系平衡吸附量的预测值与实验值吻合较好,其对二元体系中单组分和总吸附量预测的平均误差分别为9.6%和6.2%。

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