新型膜吸收海水提溴过程研究  

Novel Membrane Absorption process for Extracting Bromine from Seawater

作　　者：郝福锦[1] 武春瑞[1] 吕晓龙[1] 王国强[2] 张慧峰[2] 

机构地区：[1]中空纤维膜材料与膜过程教育部重点实验室天津工业大学生物化工研究所,天津300160 [2]国家海洋局天津海水淡化与综合利用研究所海水化学资源利用研究室,天津300192

出　　处：《盐业与化工》2008年第6期1-4,共4页Jounral of Salt and Chemical Industry

基　　金："十一五"国家科技支撑计划项目(2006BAB03A06);863计划项目(2008AA06Z303)

摘　　要：利用新型疏水性聚偏氟乙烯(PVDF)中空纤维膜及组件,开展膜吸收浓海水提溴过程研究。首先通过对膜丝寿命的考察发现,浓海水浸泡28d后,膜的孔径和强度不会改变,透水压力不会降低。运用该膜系统研究了浓海水及吸收液的浓度、流速及温度等因素对过程传质系数、脱溴率的影响。结果表明:脱溴率η和传质系数k随吸收液浓度增加而增大;在低浓度吸收液时,η和k随流速增加而增加,在浓度达到0.01mol/L时,流速增加,η和k的变化不再明显;原料液浓度对η和k影响可以忽略。原料液的流速增加,η和k显著增大,但温度升高使η和k略有下降。Bromine extraction experiment was carried out through membrane absorption method with novel polyvinylidene fluoride （PVDF） hydrophobic hollow fiber membrane, using sodium formate as absorbent. The effect of operating parameters （ concentration, velocity, temperature etc. ） on the bromine romoving rate （ η ） and mass - transfer coefficient （k） was studied. The results showed that, both of η and k increased as the augment of absorbent concentration. η and k enhanced as the velociey of the absorbent increased, when the concentration of sodium formate was 0. 003mol/L. When the concentration of absorbent was 0. 01mol/L , the two were kept constant at the same time, and the feed concentration only threw little light on η and k. Both η and k increased as the velocity of the feed brine enhanced, but decreased as the feed temperature increased. The membranes showed good stability after immersing in brine for 28 days.

关 键 词：聚偏氟乙烯 中空纤维膜 膜吸收 提溴 

分 类 号：TQ051.8[化学工程]