添加正辛醇对溴化锂水溶液表面张力及吸收率的影响  

Effects of n-octanol Addition on Surface Tension and Absorption Rate of Lithium Bromide Aqueous Solution

作　　者：王鲁宁 孙晗[1] 刘忠宝[1] 张晓亮[1] WANG Luning;SUN Han;LIU Zhongbao;ZHANG Xiaoliang(Department of Refrigeration and Cryogenic Engineering,Faculty of Environment and Life,Beijing University of Technology,Beijing 100124,China)

机构地区：[1]北京工业大学环境与生命学部制冷与低温工程系,北京100124

出　　处：《制冷技术》2023年第1期23-29,共7页Chinese Journal of Refrigeration Technology

基　　金：北京市自然科学基金(No.3202008);国家自然科学基金(No.51776006)。

摘　　要：本文采用白金板法测定了正辛醇浓度及温度对不同溴化锂浓度水溶液表面张力的影响,使用静态池吸收实验系统测定了含正辛醇的溴化锂水溶液的吸收率。研究结果表明,随溴化锂浓度的增加,无添加剂时,溶液表面张力增加,有添加剂时,溶液表面张力降低;随温度升高,无添加剂时,溶液表面张力减小,有添加剂时,正辛醇添加浓度小于100 mg/kg时,溶液表面张力增加,添加浓度大于100 mg/kg时,溶液表面张力减小。随着正辛醇浓度的增加,小于临界胶束浓度(CMC)时,溴化锂水溶液的吸收率急剧增加,大于CMC时吸收率值变化很小。质量分数为55%的溴化锂水溶液,正辛醇的添加浓度为300 mg/kg时,水蒸气的吸收率比未添加正辛醇时提高了27.6%。临界胶束浓度CMC点和水蒸气平均吸收率峰值点都随溴化锂浓度的增加向正辛醇浓度减小的方向移动。In this study,effects of n-octanol concentration and temperature on surface tension of aqueous lithium bromide solutions of different LiBr concentrations are measured by the Wilhelmy Plate method,and the absorption rates of aqueous lithium bromide solutions containing n-octanol are measured using a stagnant pool absorption experimental system.The results show that,surface tension of solution without additives is increased with LiBr concentration.Surface tension of solution with additives is decreased with LiBr concentration.Surface tension of solution without additives is decreased with temperature.Surface tension of solution with additives is increased when n-octanol concentration is smaller than 100 mg/kg and decreased when n-octanol concentration is greater than 100 mg/kg with temperature.The absorption rate of lithium bromide aqueous solution increases sharply with n-octanol concentration before critical micelle concentration(CMC)and changes a little after CMC.Water vapor absorption rate of 55%LiBr solution with 300 mg/kg n-octanol is increased 27.6%than that without n-octanol.CMC point and the peak point of water vapor absorption rate moves in direction of decreasing concentration of n-octanol.

关 键 词：表面张力 溴化锂水溶液 吸收率 临界胶束浓度 

分 类 号：TB611[一般工业技术—制冷工程] TK172[动力工程及工程热物理—热能工程]