PVDF中空纤维膜在DEA溶液中的自发浸润动力学研究
作者:卢建兴,丁忠伟,刘丽英
单位: 北京化工大学 化学工程学院,北京 100029
关键词: 疏水微孔膜;自发浸润;动力学模型
分类号: TQ028.8
出版年,卷(期):页码: 2020,40(4):9-16

摘要:
基于醇胺溶液在疏水膜上的吸附入侵机理,采用表面张力-接触角和黏附张力法并结合吸附方程测得了二乙醇胺(DEA)分子在聚偏氟乙烯(PVDF)中空纤维疏水膜壁上的吸附量,发现其固液界面上的吸附速率极其缓慢。进而明确了液气相压差在自发浸润过程中起到的重要作用,提出了多层三相接触线的观点,并辅以浸润实验进行验证。
通过膜孔中侵入溶液的平均质量法计算出了DEA溶液在PVDF中空纤维膜孔道中的平均接触角,发现其十分接近于90°。并利用膜的渗入方程与MATLAB模拟算法相结合,建立了膜的自发浸润动力学模型,与浸润实验结果具有良好的吻合性。
Based on the adsorption and intrusion mechanism of alcohol amine solution on hydrophobic membrane, the surface tension-contact angle and adhesion tension method were used in combination with the adsorption equation to measure the diethanolamine (DEA) molecules on the hydrophobic membrane wall of polyvinylidene fluoride (PVDF) hollow fiber. The amount of adsorption was found to be extremely slow at the solid-liquid interface. Furthermore, the important role of liquid-vapor pressure difference in the spontaneous wetting process was clarified, and the viewpoint of multi-layer three-phase contact line was put forward, supplemented by wetting experiment for verification.
The average contact angle of the DEA solution in the PVDF hollow fiber membrane pores was calculated by the average mass method of the intrusion solution in the membrane pores, and it was found to be very close to 90 °. Using the membrane wetting equation and MATLAB simulation algorithm, a spontaneous wetting kinetic model of the membrane is established, which is in good agreement with the wetting experiment results.

基金项目:

作者简介:

参考文献:
[1]Mosadegh-Sedghi S,Rodrigue D,Brisson J,et al.Wetting phenomenon in membrane contactors--Causes and prevention[J]. Journal of Membrane Science,2014,452:332-353.
[2] Khaisri S,deMontigny D,Tontiwachwuthikul P,et al.A mathematical model for gas absorption membrane contactors that studies the effect of partially wetted membranes[J]. Journal of Membrane Science,2010,347:228-239.
[3]LV Y,YU X,TU S T,et al.Wetting of polypropylene hollow fiber membrane contactors[J].Journal of Membrane Science,2010,362(1):444-452.
[4]Khaisri S,deMontigny D,Tontiwachwuthikul P,A mathematical model for gas absorption membrane contactors that studies the effect of partially wetted membranes[J], Journal of Membrane Science,2010,347:228-239.
[5]Rongwong W,Boributh S, Assabumrungrat S, et al.Simultaneous absorption of C02 and H2S from biogas by capillary membrane contactor[J]. Journal of Membrane Science,2012,392-393:38-47.
[6]徐晨汉,丁忠伟,刘丽英.基于界面相互干扰能分析法的二乙醇胺水溶液自发浸润聚偏氟乙烯疏水微孔膜的机理研究[J].北京化工大学学报(自然科学版),2018,45(1):13-20.
[7]Boributh S,Jiraratananon R,Li K.Analytical solutions for membrane wetting calculations based on log-normal and normal distribution functions for CO2 absorption by a hollow fiber membrane contactor[J]. Journal of Membrane Science,2013,429:459-472.
[8]崔丽云,王宇,李云鹏,丁忠伟,刘丽英.膜接触器吸收二氧化碳过程中的膜润湿研究[J].膜科学与技术,2014,34(04):33-38.
[9]Wang Z, Fang M X, Ma Q H, et al. Investigation of membrane wetting in different absorbent at elevated temperature for carbon dioxide capture [J]. Journal of Membrane Science, 2014, 455: 219-228.
[10]Cui L Y, Ding Z W, Liu L Y et al. Equilibrium and kinetics of wetting hydrophobic microporous membrane in sodium dodecyl benzene sulphonate and diethanolamine aqueous solutions [J]. Chemical Papers, 2016, 70: 305-314.
[1]Cui L Y,Ding Z W,Liu L Y,et al.Modelling and experimental study of membrane wetting in microporous hollow fiber membrane contactors[J].Can J Chem Eng,2015,93(7):1254-1265.
[12]徐晨汉,丁忠伟,刘丽英.聚偏氟乙烯/聚对苯二甲酸乙二醇酯复合膜的自发浸润动力学研究[J].膜科学与技术,2018,38(06):8-13+21.
[13]Starov V M.Spontaneous rise of surfactant solutions into vertical hydrophobic capillaries[J].J Colloid Interf Sci,2004,270(1):180-186.
[14]付东,钟智坤,吕建燚,等. 二乙醇胺水溶液的表面张力研究[J]. 华北电力大学学报,2010,37( 6) : 81-84.

服务与反馈:
文章下载】【加入收藏

《膜科学与技术》编辑部 地址:北京市朝阳区北三环东路19号蓝星大厦 邮政编码:100029 电话:010-80492417/010-80485372 传真:010-80485372邮箱:mkxyjs@163.com

京公网安备11011302000819号