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以浓海水为含溴原料液,Na OH溶液为吸收剂,考察了用聚丙烯(PP)、聚偏氟乙烯(PVDF)和聚四氟乙烯(PTFE)3种材料制作的微孔疏水中空纤维气态膜组件从浓海水中提溴的性能和使用寿命。实验结果表明PTFE中空纤维膜具有更高的传质系数和更强的耐溴氧化能力,更适合用于浓海水提溴。进而考察了各种操作条件对PTFE气态膜组件传质系数K和提溴率η的影响以及该组件的长期操作稳定性。实验结果表明:K随温度增加而增大,随料液中Na Cl含量的增大而略有减小,料液流速和含溴量、吸收液的流速和吸收剂浓度对传质系数影响不大。PTFE膜组件在连续运行的3个月内表现了良好的操作稳定性,为PTFE中空纤维气态膜法提溴工艺的工业化应用提供了技术基础。
Using concentrated seawater as raw material containing bromine and sodium hydroxide solution as absorbent, the effects of microporous hydrophobic hollow fiber (PP), polyvinylidene fluoride (PVDF) and polytetrafluoroethylene (PTFE) Performance and service life of gaseous membrane modules for stripping bromine from concentrated seawater. The experimental results show that the PTFE hollow fiber membrane has a higher mass transfer coefficient and stronger resistance to bromine oxidation, more suitable for concentrated seawater bromine. Furthermore, the influence of various operating conditions on the mass transfer coefficient K and the bromination rate η of the PTFE gas membrane module and the long-term operation stability of the module were investigated. The experimental results show that: K increases with increasing temperature, slightly decreases with the increase of NaCl content in the feed solution, the effect of feed flow rate and bromine content, the flow rate of absorbent solution and absorbent concentration on the mass transfer coefficient Big. The PTFE membrane module showed good operation stability within 3 months of continuous operation and provided the technical basis for the industrial application of the bromine bromine process using the PTFE hollow fiber gaseous membrane method.