Abstract: Aimed at developing new energy-efficient technology for the bromine extraction, continues bromine absorption in membrane air-blowing/absorption (MA-B/A) process was designed where Hydrophobic polyvinylidene fluoride (PVDF) hollow fiber membranes were used as aeration configurations. The compressed air was blown out of the aeration configurations (U-type PVDF membrane modules) in the form of small air bubbles, and flowed into respectively each membrane module which were in a series connection. Convective mass transfer happened between small air bubbles and the treating liquid (sea water simulated). Air flux carrying bromine molecules formed mixed gas made of air and bromine. Mixed gas permeated out of the membrane hole of hollow fiber hydrophobic membranes and reacted with absorption liquid to produced bromine compound, thus continues bromine extraction from the liquid was carried out. The effects of operation conditions in absorption process, such as the liquid height of absorption cell, fluid flow, concentration, pH, temperature of absorption solution, the thickness of membranes and the structure of modules in absorption process on membrane absorption process were investigated. The optimal parameters of continues bromine absorption with MA-B/A process were obtained. The experimental results show that bromine removal rate, recovery rate and absorption rate reaches 82%, 76.3% and 93.1% respectively when the membrane thickness in absorption process is 0.15 mm, the module is seaweed-type, the liquid height of absorption cell is 1.5 m, fluid flow is 0.5 L?h-1, the concentration is 0.1 mol?L-1, pH range is 6~7 and the temperature is 70 ℃ of absorption solution.

Key words: membrane airblowing, continues membrane absorption, polyvinylidene fluoride, hollowfiber hydrophobic membrane, bromine extraction

摘要： 以开发节能高效的新型提溴工艺为目的，设计了以中空纤维疏水膜作为布气装置的膜鼓气/吸收（MA-B/A）法连续吸收过程。压缩空气经过布气装置以微小气泡的形式分别进入串联的各级鼓气膜组件，与料液形成对流传质。空气流夹带料液中Br2所形成的空气/溴气混合气透过PVDF疏水膜组件的膜孔与吸收液反应，生成溴的化合物，实现对溴的连续吸收。考察了吸收池液位高度、吸收液流量、浓度、pH、温度、吸收段膜壁厚与组件结构等参数对膜吸收过程性能的影响。实验得到了MA-B/A法连续吸收过程的最佳参数条件。当膜丝厚度为0.15 mm，组件为海藻型，吸收池液位高度为1.5 m，流量为0.5 L?h-1，浓度为0.10 mol?L-1，pH为6~7，温度为70 ℃时，溴的脱除率为82.0%，回收率为76.3%，吸收率高达93.1%。

关键词: 膜鼓气, 连续膜吸收, 聚偏氟乙烯, 中空纤维疏水膜, 提溴