Simulation of solubility for separating carbon dioxide from gas mixture using ZIF-8/glycol slurry

doi:10.11949/j.issn.0438-1157.20180236

Abstract

Abstract:

The absorption-adsorption hybrid method has potential superiority on CO₂ separation and caption. In this work, the Patel-Teja equation of state coupled with the Kurihara mixing rule was used to describe the absorption equilibrium. The binary interaction coefficients between pure gas components and glycol were determined by correlating the experimental gas solubility data. Then, the Langmuir equation was applied to calculate the adsorption of gas in ZIF-8, and get the correlation of osmotic pressure of glycol liquid membrane on the surface of ZIF-8 with the equilibrium fugacity of gas component. Finally, the obtained model was applied to predict the separation of CO₂ from gas mixture using ZIF-8/glycol slurry.

Key words: carbon dioxide, absorption-adsorption, hybrid method, thermodynamic model

摘要：

吸收-吸附耦合分离法在分离捕集CO₂方面表现出潜在的优势，应用Kurihara等提出的基于局部组成概念的混合规则与Patel-Teja状态方程相结合确定乙二醇与气体组分间的吸收平衡，由溶解度实验数据确定了混合规则中的二元交互作用参数；采用Langmuir等温吸附方程确定ZIF-8与气体组分间的吸附平衡，进而确定了ZIF-8表面乙二醇膜的选择渗透压与气体组分平衡逸度间的关联式。最后将热力学模型应用到了预测ZIF-8/乙二醇浆液分离捕集CO₂体系。

关键词: 二氧化碳, 吸收-吸附, 耦合分离, 热力学模型

CLC Number:

TQ021.2

ZONG Jie, MA Qinglan, CHEN Guangjin, SUN Changyu. Simulation of solubility for separating carbon dioxide from gas mixture using ZIF-8/glycol slurry[J]. CIESC Journal, 2018, 69(10): 4276-4283.

宗杰, 马庆兰, 陈光进, 孙长宇. ZIF-8/乙二醇体系分离捕集CO₂溶解度的模拟计算[J]. 化工学报, 2018, 69(10): 4276-4283.

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