Analysis of the mass transfer mechanism in a hollow fiber membrane ozone contact reactor

doi:10.16085/j.issn.1000-6613.2023-0307

Abstract

Abstract:

A membrane-contact ozone (O₃) mass transfer technology was developed by assembling hydrophobic PTFE hollow fiber membrane into a membrane contactor. The differences between bubble mass transfer and membrane contact mass transfer were compared. The main influencing factors and mass transfer mechanism of the technology were studied by O₃ mass transfer model and resistance model. The results showed that O₃ can be effectively transferred through the hydrophobic PTFE membrane. When the stirring speed reached 1500r/min, the apparent mass transfer coefficient of membrane mass transfer (0.3049min^-1) was comparable to that of bubble mass transfer (0.3109min^-1). At the same time, the hydrophobic structure of the membrane surface reduced the humidity of the exhaust gas to below 0.8g/m³, which was much lower than the bubble mass transfer (>11.5g/m³), which met the standard of entering the ozone generator and had the feasibility of recovering oxygen. The mass transfer flux of O₃ was affected by liquid flow rate, pH value, pollutant concentration, gas flow rate and inlet O₃ concentration. When pH=11, phenol concentration was 0 or pH=7, phenol concentration was 20mg/L, the mass transfer flux reached 0.16g/(m²·h). The mass transfer resistance of the O₃ mass transfer process was mainly composed of membrane resistance and liquid phase resistance, and the liquid phase resistance can be effectively reduced by controlling the liquid phase conditions. Therefore, further reducing the mass transfer resistance required the development of membrane technology.

Key words: hydrophobic PTFE hollow fiber membrane, ozone, contact reactor, mass transfer

摘要：

将疏水性聚四氟乙烯（PTFE）中空纤维膜组装成膜接触器，开发了膜接触式臭氧（O₃）传质技术。对比了气泡传质和膜接触传质的差异，通过O₃传质模型和阻力模型对该技术的主要影响因素和传质机理进行了研究。结果表明，O₃可以有效地通过疏水性PTFE膜进行传质，当搅拌速度达到1500r/min时，膜传质的表观传质系数（0.3049min^-1）与气泡传质（0.3109min^-1）相当。同时，膜表面的疏水结构将尾气的湿度降低到0.8g/m³以下，远低于气泡传质（>11.5g/m³），符合进入臭氧发生器的标准，具备回收氧气的可行性。O₃的传质通量受液体流速、pH、污染物浓度、气体流量以及进气O₃浓度的影响。在pH=11、苯酚浓度为0或pH=7、苯酚浓度为20mg/L时，传质通量达到了0.16g/(m²·h)。O₃传质过程的传质阻力主要由膜阻力和液相阻力组成，而通过液相条件控制可以有效减小液相阻力，因此进一步降低传质阻力需要膜技术的发展。

关键词: 疏水性聚四氟乙烯中空纤维膜, 臭氧, 接触式反应器, 传质

CLC Number:

X703

YAO Fuchun, BI Yingying, TANG Chen, DU Minghui, LI Zeying, ZHANG Yaozong, SUN Xiaoming. Analysis of the mass transfer mechanism in a hollow fiber membrane ozone contact reactor[J]. Chemical Industry and Engineering Progress, 2024, 43(2): 1089-1097.

姚福春, 毕莹莹, 唐晨, 杜明辉, 李泽莹, 张耀宗, 孙晓明. 中空纤维膜臭氧接触式反应器传质机理分析[J]. 化工进展, 2024, 43(2): 1089-1097.

Figures/Tables 13

References 26

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参数名称	数值
膜参数
内径/mm	1.3
外径/mm	2.3
膜厚/mm	0.5
表面孔径分布/μm	5~10
接触角/(°)	105.7
起泡压力/MPa	0.025
膜接触反应器参数
膜丝数量/根	20
有效长度/mm	933
有效接触面积/mm²	134762.5

参数名称	数值
膜参数
内径/mm	1.3
外径/mm	2.3
膜厚/mm	0.5
表面孔径分布/μm	5~10
接触角/(°)	105.7
起泡压力/MPa	0.025
膜接触反应器参数
膜丝数量/根	20
有效长度/mm	933
有效接触面积/mm²	134762.5

搅拌速度 /r·min^-1	传质参数
	膜传质		气泡传质
	K_La/s^-1	R²	K_La/s^-1	R²
0	1.6×10^-3	0.9942	3.0×10^-3	0.9931
500	2.2×10^-3	0.9904	4.2×10^-3	0.98321
1000	4.4×10^-3	0.9913	5.2×10^-3	0.9909
1500	5.1×10^-3	0.9927	5.2×10^-3	0.9937

搅拌速度 /r·min^-1	传质参数
	膜传质		气泡传质
	K_La/s^-1	R²	K_La/s^-1	R²
0	1.6×10^-3	0.9942	3.0×10^-3	0.9931
500	2.2×10^-3	0.9904	4.2×10^-3	0.98321
1000	4.4×10^-3	0.9913	5.2×10^-3	0.9909
1500	5.1×10^-3	0.9927	5.2×10^-3	0.9937

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