离子液体-水复配吸收剂对VOCs的吸收性能

将水、离子液体按一定比例复配作为吸收剂，以甲苯、丙酮作为挥发性有机化合物(VOCs)的典型代表，比较了不同种类离子液体-水复配吸收剂对含甲苯、丙酮混合废气的吸收效果。结果发现，1-十二烷基-3-甲基咪唑双三氟甲磺酰亚胺盐(［DDMIM］［NTf2］)与水形成的O/W型离子液体乳化液对体系的吸收效果较好，由COSMO-SAC计算得到了甲苯和丙酮在［DDMIM］［NTf-2］中的无限稀释活度系数，并计算了吸收过程的Gibbs自由能、焓变、熵变和偏摩尔超额焓等热力学数据。实验验证了离子液体-水复配吸收剂吸收芳香类化合物、酮类化合物混合废气的可行性，考察了不同实验条件对吸收效果的影响。结果表明：在甲苯、丙酮进气质量浓度分别为15000 mg/m3和7500 mg/m3、进气流量0.024 m3/h、搅拌速率1600 r/min、吸收温度303.15 K的实验条件下，［DDMIM］［NTf2］质量分数为10%的100 g复配吸收剂对甲苯的初始吸收率为94%，对丙酮的初始吸收率为95%；通过对复配吸收剂进行再生及循环吸收实验，验证了复配吸收剂回收利用的可能性。

Absorption Performance of Ionic Liquids-Water Complex Absorbent for VOCs

Ionic liquids and water were mixed as absorbent, and toluene and acetone were selected as typical representatives of volatile organic compounds (VOCs). The effects of different ionic liquid water absorbents on mixed gas containing toluene and acetone were compared. The results show that the O/W emulsifier formed by 1-dodecyl-3-methylimidazolium bis((trifluoromethyl)sulfonyl)imide(［DDMIM］［NTf2］) and water has the best absorption properties. Infinite dilution activity coefficients of toluene and acetone in ［DDMIM］［NTf2］ were calculated by COSMO-SAC. Moreover, the thermodynamic data such as Gibbs energy, partial molar enthalpies, entropies, and partial molar excess enthalpies were also calculated. The feasibility of absorbing aromatic and ketone mixed waste gas by ionic liquid water compound absorbents was verified by experiments. The results show that under the toluene and acetone intake mass concentrations of 15000 mg/m3 and 7500 mg/m3, intake flow of 0.024 m3/h, stirring rate of 1600 r/min, and the absorption temperature of 303.15 K, in 100 g complex absorption with 10% ［DDMIM］［NTf2］, the initial absorption rates of toluene and acetone are 94% and 95%, respectively. The recycling feasibility was further verified through the regeneration and the cyclic absorption experiment.