复合溶液膜吸收CO2的性能及其对膜孔润湿的影响

doi:10.16085/j.issn.1000-6613.2018-1557

化工进展 ›› 2019, Vol. 38 ›› Issue (05): 2491-2498.DOI: 10.16085/j.issn.1000-6613.2018-1557

复合溶液膜吸收CO₂的性能及其对膜孔润湿的影响

孙莹¹(),杨树莹¹,杨林军^1,²()

1. 东南大学能源热转换及其过程测控教育部重点实验室，江苏南京 210096
2. 江苏省煤基CO2捕集与地质封存;重点实验室（中国矿业大学），江苏徐州 221008

收稿日期:2018-07-30 修回日期:2018-08-24 出版日期:2019-05-05 发布日期:2019-05-05
通讯作者: 杨林军
作者简介:<named-content content-type="corresp-name">孙莹</named-content>（1993—），女，硕士研究生，研究方向为CO2捕集。E-mail：<email>sunyingsama@163.com</email>。
基金资助:
江苏省煤基CO2捕集与地质储存重点实验室（2016年）开放基金(2016A05)

Effect of complex solution on CO₂ absorption and wettability of membrane

Ying SUN¹(),Shuying YANG¹,Linjun YANG^1,²()

1. Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education，Southeast University，Nanjing 210096，Jiangsu，China
2. Key Laboratory of Coal-based CO2 Capture and Geological Storage，China University of Mining and Technology，Xuzhou 221008，Jiangsu，China

Received:2018-07-30 Revised:2018-08-24 Online:2019-05-05 Published:2019-05-05
Contact: Linjun YANG

摘要/Abstract

摘要：

利用自行搭建的CO₂膜吸收实验台，采用聚丙烯（PP）膜组件，以质量分数10%的N-甲基二乙醇胺（MDEA）作为主体胺溶液，添加不同配比的哌嗪（PZ）、乙醇胺（MEA）、甘氨酸钾（PG），考察CO₂脱除效率和传质速率的变化，比较不同复配比的复合溶液表面张力以及对PP膜的浸润性，并以10%MDEA+10%PG混合溶液作为吸收液进行长时间实验。结果表明：添加少量的添加剂对MDEA溶液膜吸收CO₂均有显著的促进作用，当配比小于0.2时，促进作用大小为PZ>MEA>PG；当配比大于0.2时，促进作用大小为PZ>PG>MEA；PZ和MEA均随着添加配比的增加，溶液表面张力减小，而PG相反；表面张力小的溶液对膜浸润性较强，容易造成膜润湿；添加剂质量分数均为10%时，对膜溶胀性和疏水性以及膜孔结构影响大小为PZ>MEA>PG；在20天内，PG/MDEA混合溶液作用下的CO₂脱除效率从89.56%下降为83.09%，对PP的疏水性影响较小，膜组件可以稳定运行。吸收液表面张力对膜吸收法脱除CO₂性能的影响显著。所得结果可为膜吸收CO₂吸收剂复配提供依据，并可为揭示膜吸收CO₂过程中膜润湿导致膜失效的机理以及抑制膜润湿提供实验数据。

关键词: 膜吸收, 复合溶液, 膜润湿, 二氧化碳, 表面张力

Abstract:

Using 10% MDEA as the main amine solution and different proportions of piperazine (PZ),ethanolamine (MEA) and glycine potassium (PG) were used as absorption solutions to compare the change of CO₂ removal efficiency and mass transfer rate by polypropylene（PP） hollow fiber member contactor in self built CO₂ membrane absorption test platform． The surface tension of different complex ratio mixed solution and the wettability of PP films were compared．Long-term experimental runs were carried out using 10%MDEA+10%PG mixed solution as the absorption solution．The results showed that the addition of a small amount of additives can significantly promote the MDEA solution．When the ratio is less than 0.2， the promotion effect is PZ>MEA>PG， when the ratio is greater than 0.2， the promotion effect is PZ>PG>MEA． The surface tension of PZ and MEA decreases with the increase of the addition ratio， but the PG is the opposite． The solution with small surface tension is more infiltrating to the membrane, which can easily cause the wetting of the membrane．when the additive concentration is 10%.The effect on membrane swellability and hydrophobicity and membrane pore structure is：PZ>MEA>PG．The CO₂ removal efficiency under MDEA/PG mixed solution decreases from 89.56% to 83.09% during 20 days of operation， which has little effect on the hydrophobicity of PP． The surface tension of absorption liquid has a significant effect on the removal of CO₂ with membrane gas absorption method. The results can provide a basis for the formulation of CO₂ absorber, and also provide experimental data for revealing the mechanism of membrane failure caused by membrane wetting and inhibition of membrane wetting．

Key words: membrane absorption, complex solution, membrane wetting, carbon dioxide, surface tension

中图分类号:

X511

孙莹, 杨树莹, 杨林军. 复合溶液膜吸收CO₂的性能及其对膜孔润湿的影响[J]. 化工进展, 2019, 38(05): 2491-2498.

Ying SUN, Shuying YANG, Linjun YANG. Effect of complex solution on CO₂ absorption and wettability of membrane[J]. Chemical Industry and Engineering Progress, 2019, 38(05): 2491-2498.

图/表 11

表1 PP中空纤维膜膜组件参数

型号	组件外径/mm	组件内径/mm	组件长度/mm	膜丝外径/μm	膜丝内径/μm²	有效膜面积/m²	孔径分布/μm
KH-4020	94	80	580	400	300	6	0.1~0.5

图1 CO2吸收工艺流程图

图2 不同配比添加剂对PP中空纤维膜CO2脱除

图3 表面张力随添加剂浓度变化

图4 不同浓度添加剂对PP膜接触角影响

图5 PP膜溶胀率随时间变化

图6 接触角随时间变化

图7 浸渍60天后的PP膜接触角

图8 浸渍60天后的PP膜电镜图

图9 10h PP膜CO2脱除性能变化

图10 20天内PP膜CO2脱除性能变化

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复合溶液膜吸收CO₂的性能及其对膜孔润湿的影响

Effect of complex solution on CO₂ absorption and wettability of membrane

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