溴水的膜吸收性能研究
作者:唐娜12,曹莎12,熊清华3
单位: 1. 天津科技大学海洋科学与工程学院,3004572. 天津海洋资源与化学重点实验室,300457; 3. 江西省九江市安全生产监督管理局,332000
关键词: 膜吸收;溴水;PVDF;中空纤维膜
出版年,卷(期):页码: 2012,32(1):80-86

摘要:
溴素是重要的化工原料之一。本文以NaOH溶液作为吸收剂,采用PVDF中空纤维膜,研究了吸收时间、溴水温度、吸收液浓度及其流速等操作条件对溴水膜吸收性能的影响。研究标明:溴的吸收率随吸收时间的增加而增大,溴水膜吸收过程进料温度与传质系数之间符合阿伦尼斯关系。吸收液侧NaOH的浓度从0.003mol/L增加至0.01mol/L时,传质系数从4.75×10-4cm/s增至6.02×10-4cm/s,对应的膜通量从2.4×10-3kg/(m2•h)增至3×10-3kg/(m2•h)。吸收液的流体动力学条件对于溴水膜吸收过程通量无显著影响。本文采用回归正交试验确定了溴水膜吸收过程的回归方程,该方程可以预测、优化不同条件下的膜吸收传质性能参数,同时分析了影响因素的显著性。由回归正交实验设计确定PVDF膜溴水膜吸收最佳工艺为:吸收侧为NaOH溶液流量为2L/h、浓度为0.01mol/L时,进料侧温度为50℃、进料流速为22.24cm/s、进料浓度为220mg/L时膜通量达到最大值为6.17×10-3kg/(m2•h)。
 Bromine is one of an important chemical raw material. The effects of absorption time, aqueous bromine solution temperature, stripping solution concentration and flow and the other operating conditions on membrane absorption performances of aqueous bromine solution were studied, polyvinylidene fluoride (PVDF) hollow fiber membranes were used, and NaOH was a stripping solution. The results showed that absorption rate of bromine increased with increasing of absorption time, feed temperature and mass transfer coefficient was consistent with Arrhenius relationship for membrane absorption process. The concentration of stripping solution was increased from 0.003mol/L to 0.01mol/L, mass transfer coefficient increasing from 4.75×10-4cm/s to 6.02×10-4cm/s, and membrane flux increasing from 2.4×10-3kg/(m2.h) to 3×10-3kg/(m2.h) accordingly. The effect of fluid dynamic conditions of stripping side on membrane flux for membrane absorption was not obvious.
Regression orthogonal experiment was adopted to develop the regression equation of membrane absorption of aqueous bromine solution for the first time, through which mass transfer performances under other different hydromechanics conditions could be predicted and optimized, and significant factors of aqueous bromine solution membrane absorption was determined. When feed temperature was 50℃, feed flow rate was 22.24cm/s, feed concentration was 220mg/L, stripping flow rate was 2L/h and stripping concentration was 0.01mol/L, aqueous bromine solution mmembrane absorption flux 6.17×10-3kg/(m2•h)was obtained.
曹莎(1986-),女,天津市人,硕士研究生,研究方向:膜分离。*通讯作者:唐娜(1972-),女,辽宁海城市人,博士,教授,硕士研究生导师。主要研究方向:膜分离,海卤水资源综合利用。 Email: tjtangna@tust.edu.cn, Tel: 022-60601158。

参考文献:
[1] 许红英,张俊杰,李红霞. 溴系精细化学品发展现状综述.[J].河北理工学院学报, 2006, 28(3):     88~91.
[2] 张琳娜,刘有智,焦纬洲,等.卤水提溴技术的发展及研究现状.[J]. 盐湖研究,2009,17(1):68~72.
[3] Zhang Qi,Cussler E L.Bromine recovery with hollow fiber gas membranes.[J].Journal of Membrane Science,1985 ,24: 43~57.
[4] Zhang Qi, Cussler E L.Hollow Fiber Gas Membranes.[J]. AIChE J,1985,31(9):1548~1553.
[5] Yang Ming-Chen, Cussler E L. Designing Hollow- Fiber Contactors.[J].AIChE J,1986,32(11): 1910~1916.
[6] Zhang QI,E.L.CUSSLER. MICROPOROUS HOLLOW FIBERS FOR GAS ABSORPTION[J].Journal  of Membrane Science,1985,23:321-332.
[7] 仉琦,姚占力,王国强.中空纤维气态膜海水提溴.[J].水处理技术,1986,12(5): 261~266.
[8] 仉琪,于伯杉等.膜性能对气态膜迁移过程的影响.[J].水处理技术,1988,14(6):334~338.
[9] 王国强,张淑芬,王俐聪等.气态膜法海水提溴影响因素的研究.[J]. 海洋技术,2004,23(1):77~80.
[10] 王国强,张淑芬,王俐聪等.聚偏氟乙烯中空纤维气态膜法海水提溴.[J]. 海盐湖与化工,2004,33(2):17~19.
[11] 郝福锦,武春瑞,吕晓龙等.新型膜吸收海水提溴过程.[J]. 盐业与化工,2008,37(6):1~4.
[12] 郝福锦,吕晓龙,王国强等.膜法提溴过程的研究与对比.[J]. 化工进展,2009,28(6):972~932.
[13] 武春瑞,郝福锦,贾悦等.PVDF中空纤维疏水膜的鼓气吸收法海水提溴性能研究.[J].功能材料,      2009,40(9):1563~1569.
[14] 吴丹,武春瑞,赵恒等.鼓气膜吸收法海水提溴研究.[J]. 水处理技术,2010,36(2):76~79.
[15] 刘志达, 刘梅蓉. 工业溴成分含量的测定.[J].海湖盐与化工,1994,23(1):26~30.
[16] 张慧峰,王国强,张淑芬,等.温度对气态膜过程传质性能影响.[J].水处理技术,2007,33(1):16~19.
[17] 夏清,陈常贵.化工原理[M].天津:杨欢, 2005. 332~333..
[18] T K 修伍德,(美)R L 皮克福特,(美)C R 威尔基.传质学[M].时均,李盘生,译.北京:化学工业出版社,1988.
[19] 李云雁,胡传荣.试验设计与数据处理[M].北京:化学工业出版社,2005.
 

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