首页|中空纤维膜臭氧接触式反应器传质机理分析

中空纤维膜臭氧接触式反应器传质机理分析

扫码查看
原文链接
  • 国家科技期刊平台
  • NETL
  • NSTL
  • 万方数据
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。
Analysis of the mass transfer mechanism in a hollow fiber membrane ozone contact reactor
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.

hydrophobic PTFE hollow fiber membraneozonecontact reactormass transfer

姚福春、毕莹莹、唐晨、杜明辉、李泽莹、张耀宗、孙晓明

展开 >

中国环境科学研究院国家环境保护生态工业重点实验室,北京 100012

华北理工大学建筑工程学院,河北 唐山 063000

疏水性聚四氟乙烯中空纤维膜 臭氧 接触式反应器 传质

国家重点研发计划黄河流域生态保护和高质量发展联合研究一期项目中央级公益性科研院所基本科研业务费专项中国环境科学研究院国家环境保护生态工业重点实验室开放基金

2022YFC39013012022-YRUC-01-04042022YSKY-092022KFF-15

2024

10.16085/j.issn.1000-6613.2023-0307

化工进展
中国化工学会,化学工业出版社

化工进展

CSTPCD北大核心
影响因子：1.062
ISSN：1000-6613
年,卷(期)：2024.43(2)
  • 26