CO2在ZIF-8/乙二醇-2-甲基咪唑浆液中溶解能力理论分析

doi:10.16085/j.issn.1000-6613.2021-0962

摘要/Abstract

摘要：

有效降低CO₂排量实现碳中和是当前研究热点之一。ZIF-8/乙二醇-2-甲基咪唑浆液被发现不仅能高效地捕集CO₂，同时能利用浆液良好的流动性实现一个碳捕集-浆液流动再生-浆液再利用的连续碳捕集过程。为了有效地掌握纯CO₂气体在ZIF-8/乙二醇-2-甲基咪唑浆液中的溶解能力，本文首先测定了293.15K、303.15K和313.15K下CO₂在干ZIF-8上的吸附量和在2-甲基咪唑-乙二醇溶液中的溶解性；然后基于Langmuir方程和CO₂溶解机理进一步建立了相应吸附量和溶解度计算数学模型；最后综合考虑ZIF-8/乙二醇-2-甲基咪唑浆液中乙二醇和ZIF-8之间的共存特征和相互影响，建立了CO₂在目标浆液中溶解吸收量计算数学关联式。所得研究结果对浆液法CO₂技术的推广和后续流程模拟具有良好的指导作用和理论意义。

关键词: ZIF-8/乙二醇-2-甲基咪唑浆液, 二氧化碳, 溶解性, 模型, 二氧化碳捕集

Abstract:

Effectively reducing CO₂ emissions to achieve carbon neutrality is one of the current research hotspots. Our recent research found that ZIF-8/glycol-2-methylimidazole slurry can not only capture CO₂ from gas mixtures efficiently, but also make use of the good flow of the slurry, a continuous separation process of carbon capture-slurry regeneration-slurry reuse could be realized. In order to understand the solubility of pure CO₂ gas in ZIF-8/glycol-2-methylimidazole slurry, in this work, first, the adsorption ability of CO₂ in the dry ZIF-8 material and the solubility of it in the 2-methylimidazole-glycol solution at 293.15K, 303.15K and 313.15K and different pressures were measured. Meanwhile, based on the Langmuir equation and CO₂ dissolution mechanism in 2-methylimidazole-glycol solution, the corresponding CO₂ adsorption capacity and solubility calculation mathematical models were established. Finally, considering the coexistence characteristic and mutual influence of glycol and ZIF-8 in ZIF-8/glycol-2-methylimidazole slurry, a mathematical correlation equation for calculating the sorption amount of CO₂ in the target slurry was proposed. The obtained research results have good theoretical guidance for the promotion of CO₂capture technology by using the ZIF-8 slurry and subsequent process simulation.

Key words: ZIF-8/glycol-2-methylimidazole slurry, carbon dioxide, solubility, model, CO₂ capture

中图分类号:

X501

姚德松, 刘煌, 陈莉, 李瑞景, 王舰. CO₂在ZIF-8/乙二醇-2-甲基咪唑浆液中溶解能力理论分析[J]. 化工进展, 2021, 40(S2): 315-321.

YAO Desong, LIU Huang, CHEN Li, LI Ruijing, WANG Jian. Theoretical analysis of CO₂ dissolution ability in ZIF-8/glycol-2-methylimidazole slurry[J]. Chemical Industry and Engineering Progress, 2021, 40(S2): 315-321.

图/表 10

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293.15K		303.15K		313.15K
压力 /MPa	吸附量 /mol·kg^-1	压力 /MPa	吸附量 /mol·kg^-1	压力 /MPa	吸附量 /mol·kg^-1
0	0	0	0	0	0
0.25	2.028	0.617	3.575	0.61	3.389
0.567	3.711	0.959	4.956	1.08	4.588
1.031	5.659	1.599	6.018	1.78	5.510
1.541	6.627	2.202	6.592	2.79	6.267
2.115	7.274	3.092	7.273	4.2	6.681
2.552	7.552	4.11	7.691
3.066	7.913
3.556	8.277
4.192	8.564

293.15K		303.15K		313.15K
压力 /MPa	吸附量 /mol·kg^-1	压力 /MPa	吸附量 /mol·kg^-1	压力 /MPa	吸附量 /mol·kg^-1
0	0	0	0	0	0
0.25	2.028	0.617	3.575	0.61	3.389
0.567	3.711	0.959	4.956	1.08	4.588
1.031	5.659	1.599	6.018	1.78	5.510
1.541	6.627	2.202	6.592	2.79	6.267
2.115	7.274	3.092	7.273	4.2	6.681
2.552	7.552	4.11	7.691
3.066	7.913
3.556	8.277
4.192	8.564

293.15K		303.15K		313.15K
压力 /MPa	溶解度 /mol·L^-1	压力 /MPa	溶解度 /mol·L^-1	压力 /MPa	溶解度 /mol·L^-1
0	0	0	0	0	0
0.0153	0.195	0.0289	0.126	0.035	0.201
0.114	0.738	0.193	0.826	0.37	0.907
0.279	1.319	0.335	1.172	0.61	1.185
0.513	1.851	0.529	1.537	0.77	1.365
0.735	2.217	0.783	1.877	0.93	1.534
0.857	2.422	0.957	2.082	1.25	1.837
0.974	2.607	1.213	2.401	1.47	2.031

293.15K		303.15K		313.15K
压力 /MPa	溶解度 /mol·L^-1	压力 /MPa	溶解度 /mol·L^-1	压力 /MPa	溶解度 /mol·L^-1
0	0	0	0	0	0
0.0153	0.195	0.0289	0.126	0.035	0.201
0.114	0.738	0.193	0.826	0.37	0.907
0.279	1.319	0.335	1.172	0.61	1.185
0.513	1.851	0.529	1.537	0.77	1.365
0.735	2.217	0.783	1.877	0.93	1.534
0.857	2.422	0.957	2.082	1.25	1.837
0.974	2.607	1.213	2.401	1.47	2.031

温度/K	饱和吸附量A	系数1	系数2
293.15	9.7966	1.2403	1.1435
303.15	8.7831	1.2650	1.1801
313.15	7.7411	1.3359	1.0952

CO₂在ZIF-8/乙二醇-2-甲基咪唑浆液中溶解能力理论分析

Theoretical analysis of CO₂ dissolution ability in ZIF-8/glycol-2-methylimidazole slurry

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图/表 10

参考文献 30

相关文章 15

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Metrics

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系数	293.15K	303.15K	313.15K
x₁	4.0171	1.6542	-1.1366
x₂	-88.0456	-68.0804	-65.2812
x₃	-1.0840	-1.7063	-3.0891
x₄	0.4112	-0.1267	0.2531
x₅	4.4929	3.7818	4.2774
x₆	2.2519	2.8605	4.5994

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温度/K	生成焓（H_m）/kJ·mol^-1	平衡常数（k_m）
293.15	3.8441	0.1340
303.15	5.3812	0.1139
313.15	8.1756	0.0765

温度/K	生成焓（H_m）/kJ·mol^-1	平衡常数（k_m）
293.15	3.8441	0.1340
303.15	5.3812	0.1139
313.15	8.1756	0.0765