吸附树脂吸附多组分VOCs的动力学特性及预测
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摘要
采用微分吸附床(DAB)法研究甲苯、环己烷、正戊烷的单组分、双组分和三组分在2种不同孔结构吸附树脂上的吸附动力学行为,探讨了吸附树脂的孔结构对吸附动力学的影响,建立多组分吸附动力学预测模型.结果表明,单组分甲苯、环己烷和正戊烷在2种吸附树脂上吸附扩散阻力同时存在于微孔孔口和孔内,符合孔口-孔内双阻力模型(Dual模型);采用孔口-孔内双阻力模型结合扩展Langmuir多组分吸附平衡方程,可根据单组分吸附动力学数据较好地预测双组分和三组分VOCs在2种吸附树脂上的吸附动力学曲线,预测值与实验值间的平均相对误差小于17%;相比于大孔吸附树脂,各组分在超高交联吸附树脂上吸附过程存在明显的竞争取代,取代顺序为甲苯>环己烷>正戊烷.
The effect of the pore structure of polymeric resins on their adsorption kinetics was explored and Dual Resistance Model for predicting absorption kinetics of multiple components was established. The adsorption kinetics of individual toluene, cyclohexane and n-pentane as well as their dual or triple combinations on two polymeric resins were studied by the differential adsorption bed(DAB) method. Dual Resistance Model, which is a combination of barrier resistance at the micropore mouth and pore interior resistance, was effective for the fitting of adsorption kinetic data of single component, indicating that the adsorption diffusion resistance existed at the micropore mouth and the mircopore interior simultaneously. The adsorption kinetic curves of binary and ternary component VOCs on two resins can be predicted effectively by using the Dual Resistance Model as well as the extended Langmuir multi-component adsorption equilibrium equation. The average error between model prediction and experimental data were less than 17%. The competitive adsorption between the different components on the microporous resin was more significant than that on the macroporous resin and adsorption affinity of three VOCs on two resins had the following order: toluene >cyclohexane > pentane.
The effect of the pore structure of polymeric resins on their adsorption kinetics was explored and Dual Resistance Model for predicting absorption kinetics of multiple components was established. The adsorption kinetics of individual toluene, cyclohexane and n-pentane as well as their dual or triple combinations on two polymeric resins were studied by the differential adsorption bed(DAB) method. Dual Resistance Model, which is a combination of barrier resistance at the micropore mouth and pore interior resistance, was effective for the fitting of adsorption kinetic data of single component, indicating that the adsorption diffusion resistance existed at the micropore mouth and the mircopore interior simultaneously. The adsorption kinetic curves of binary and ternary component VOCs on two resins can be predicted effectively by using the Dual Resistance Model as well as the extended Langmuir multi-component adsorption equilibrium equation. The average error between model prediction and experimental data were less than 17%. The competitive adsorption between the different components on the microporous resin was more significant than that on the macroporous resin and adsorption affinity of three VOCs on two resins had the following order: toluene >cyclohexane > pentane.
引文
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[2]张冰,邓之银,郑靖奎,等.拉曼光谱技术的汽油组分含量测定[J].光谱学与光谱分析,2015,35(6):1577-1581.Zhang B, Deng Z Y, Zheng J K, et al. Determination of gasoline composition based on raman spectroscopy[J]. Spectroscopy and Spectral Analysis, 2015,35(6):15 77-1581.
[3]陈永坤.几种油气回收处理技术的介绍和比较[J].广东化工,2017,44(8):118-119.Chen Y K. Introduction and comparison of several oil gas recovery and treatment technologies[J]. Guangdong Chemical Industry, 2017,44(8):118-119.
[4]中国环境保护产业协会废气净化委员会.我国有机废气治理行业2013年发展综述[J].中国环保产业,2014,(10):4-9.Waste Gas Purification Committee of CAEPI. Development report on organic waste gas treatment industries of china in 2013[J]. China Environmental Protection Industry,2014,(10):4-9.
[5] Ibrahim I, He J M, Kim C N et al. Adsorption equilibrium and kinetics of gasoline vapors onto carbon-based adsorbents[J]. Journal of Chemical&Engineering Data, 2008,53:41-47.
[6] He J M, Ng K C, Yap C, et al. Effect of pressure on the adsorption rate for gasoline vapor on pitch-based activated carbon[J]. Journal of Chemical&Engineering Data, 2009,54:1504-1509.
[7]吴柳彦.汽油油气中多组分VOCs在吸附树脂上的竞争吸附研究[D].南京:南京大学,2017.Wu L Y. Competitive adsorption of multicomponent VOCs in gasolineon polymeric resins[D]. Nanjing:Nanjing University, 2017.
[8]黄海凤,顾勇义,殷操,等.高分子树脂与介孔分子筛吸附-脱附VOCs性能对比[J].中国环境科学,2012,32(1):62-68.Huang H F, Gu Y Y, Yin C, et al. The adsorption-desorption performance of volatile organic compounds(VOCs)onto polymer resin and mesoporous molecular sieves[J]. China Environmental Science, 2012,32(1):62-68.
[9]金玉娇,卢晗锋,周瑛,等.水雾协同微波脱附再生树脂吸附剂[J].中国环境科学,2016,36(9):2599-2605.Jin Y J, Lu H F, Zhou Y, et al. Desorption of non-polar organics on PDVB resin under microwave radiation cooperated with atomized water[J]. China Environmental Science, 2016,36(9):2599-2605.
[10] Fontanals N, Gaila M, Cormack A Q et al. Evaluation of a new hypercrosslinked polymer as a sorbent for solid-phase extraction of polar compounds[J]. Journal of Chromatography A,2005,1075:51-56.
[11] Huang J,Deng R, Huang K. Equilibria and kinetics of phenol adsorption on a toluene-modified hyper-cross-linked poly(styreneco-divinylbenzene)resin[J]. Chemical Engineering Journal,2011,171(3):951-957.
[12]近藤精一,石川达雄,安部郁夫,等.吸附科学[M].北京:化学工业出版社,2006.Kondo S, Ishikawa T, Abe I, et al. Adsorption Science[M]. Beijing:Chemical Industry Press, 2006.
[13] Huang Q, Farooq S, Karimi I A. Prediction of binary gas diffusion in carbon molecular sieves at high pressure[J]. AICHE Journal, 2004,50(2):351-367.
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