Rigorous modelling and multi-objective optimization for hybrid absorption-adsorption separation process of CH_(4)/C_(2)H_(6)using ZIF-8/iso-hexadecane slurryOA
Efficient separation of CH_(4)and C_(2)H_(6)remains a critical challenge in the recovery of light hydrocarbons from natural gas.So we developed a zeolite imidazolate framework-8(ZIF-8)/iso-hexadecane slurry for CH_(4)/C_(2)H_(6)separation,and conducted solubility measurements for pure components and equilibrium separation experiments for gas mixtures.A rigorous absorption-adsorption coupled phase equilibrium model and a single equilibrium stage mathematical model were established to describe the phase equilibrium performance of gas-slurry system.The results indicated that the model exhibits high predictive accuracy for the solubility of CH_(4)and C_(2)H_(6)in the slurry,with an average relative error of less than 3.053%.Furthermore,the whole process of absorption-adsorption-desorption was designed,and the mathematical model and multi-objective optimization framework were established.The effects of operating pressure and gas-slurry ratio on product purity,recovery ratio,and total unit energy consumption were investigated.The results showed that the C_(2)H_(6)purity in the feed gas is enriched from 22 mol/mol to 94.69 mol/mol,the C_(2)H_(6)recovery ratio reaches 95.21%,and the total unit energy consumption is 0.4558 kW·h·Nm^(-3)(feed gas).In addition,the effects of pressure,temperature,and ZIF-8 solid content on slurry separation performance were analyzed using the established equilibrium-stage model.The results showed that the introduction of ZIF-8 enhances the separation performance of the iso-hexadecane solvent for mixed gases.Compared to the pure solvent,the separation factor increased by an average of 72.5%,which theoretically proved the advantages of slurry separation process.
Ninghan Gao;Ruihang Zhang;Ziying Zhao;Pan Cao;Muxian Liu;Bei Liu;Chun Deng;Guangjin Chen
State Key Laboratory of Heavy Oil Processing,College of Chemical Engineering and Environment,China University of Petroleum,Beijing,102249,ChinaState Key Laboratory of Heavy Oil Processing,College of Chemical Engineering and Environment,China University of Petroleum,Beijing,102249,ChinaState Key Laboratory of Heavy Oil Processing,College of Chemical Engineering and Environment,China University of Petroleum,Beijing,102249,China Beijing Basem of Technology Co.Ltd.,Beijing,100101,ChinaState Key Laboratory of Heavy Oil Processing,College of Chemical Engineering and Environment,China University of Petroleum,Beijing,102249,ChinaState Key Laboratory of Heavy Oil Processing,College of Chemical Engineering and Environment,China University of Petroleum,Beijing,102249,ChinaState Key Laboratory of Heavy Oil Processing,College of Chemical Engineering and Environment,China University of Petroleum,Beijing,102249,ChinaState Key Laboratory of Heavy Oil Processing,College of Chemical Engineering and Environment,China University of Petroleum,Beijing,102249,ChinaState Key Laboratory of Heavy Oil Processing,College of Chemical Engineering and Environment,China University of Petroleum,Beijing,102249,China
能源科技
Hybrid absorption-adsorptionCH4/C2H6 separationProcess modellingMulti-objective optimizationMOF slurry-based separation
《Green Chemical Engineering》 2026 (4)
P.447-459,13
supported by the National Natural Science Foundation of China(No.22127812)State Key Laboratory of Heavy Oil Processing,China University of Petroleum and Key Laboratory of Carbon Neutral Energy Technology(CNIF20230305)Shandong Institute of Petroleum and Chemical Technology。
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