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)法连续脱溴过程。压缩空气经过布气装置(U型PVDF中空纤维疏水膜组件)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(模拟海水)形成对流传质,实现溴素的连续脱除。考察了鼓气膜组件级数、组件装填密度、料液流量、鼓气强度、组件长度等参数对溴脱除率的影响。实验得到了MA-B/A法3级连续脱溴过程的最佳参数条件。在装填密度为13.4%,料液流量为0.5 L.h-1,鼓气强度为7200 mol.m-2.h-1,组件长度为1 m条件下,溴的脱除率高达82%。SEM与EDS分析表明,在实验时间内,溴的强氧化性并未对PVDF疏水膜性能造成影响。
For developing a new energy-efficient technology for bromine extraction, a continuous bromine extraction with membrane air-blowing/absorption (MA-B/A) was designed, in which hydrophobie 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 entered the membrane modules connected in series separately. Convective mass transfer occurred between small air bubbles and the liquid (simulated sea water), and continuous bromine extraction for the liquid was carried out. The effects of operation conditions, such as the stage number, packing density, flow rate of liquid, air-blowing intensity and the length of air-blowing membrane module, on bromine removal rate were investigated. The optimal parameters of continuous bromine extraction with MA-B/A for 3-stage air-blowing membrane modules were obtained. The experimental results show that the bromine removal rate reaches 82% when the packing density is 13.4%, the length is 1 m, the flow rate of feed is 0.5 L ·h^1 , and the air-blowing intensity is 7200 mol · m^2 · h ^1. Scanning electron microscope (SEM) and energy dispersive spectroscopy (EDS) analysis show that strong oxidizing bromine has little effect on the performance of PVDF hydrophobic hollow fiber membranes.
出处
《化工学报》
EI
CAS
CSCD
北大核心
2011年第10期2791-2796,共6页
CIESC Journal
基金
天津市重点基金项目(09JCZDJC26300)~~
关键词
膜鼓气
膜吸收
聚偏氟乙烯
中空纤维疏水膜
连续脱溴
membrane air-blowing
membrane absorption
polyvinylidene fluoride
hollow-fiber hydrophobicmembrane
continuous bromine extraction