胶质液泡传质特性和机理研究
文献类型：学位论文
| 作者 | 何艺 |
| 学位类别 | 博士 |
| 答辩日期 | 2008-09-04 |
| 授予单位 | 中国科学院过程工程研究所 |
| 授予地点 | 过程工程研究所 |
| 导师 | 毛在砂 |
| 关键词 | 胶质液泡 表面活性剂 稳定性 电导法 传质 |
| 其他题名 | Mass transfer performance and mechanism of colloidal liquid aphrons |
| 学位专业 | 化学工程 |
| 中文摘要 | 本论文对介观尺度含表面活性剂液－液体系（胶质液泡）的传质特性和机理进行了实验考察和计算机模拟研究。主要内容可分为以下四个部分： （a） 稳定的含溶质胶质液泡的筛选 实验考察了有机溶剂极性、表面活性剂的种类和组合、有机溶剂核心中溶质的加入及其性质等对含溶质胶质液泡稳定性的影响。筛选得到的含溶质稳定胶质液泡（可用于传质实验）为：有机溶剂为环己烷，溶质为苯甲酸，表面活性剂组合为SDS+Tween-20、SDBS+Tween-20、SDS+ Span-20、SDBS+Span-20。 （b） 提出胶质液泡稳定性模型 应用电导法监测静置分层实验，考察了有机溶剂极性和电解质浓度对分散态胶质液泡稳定性的影响。根据实验结果并结合胶质液泡体系的不稳定因素，提出了分散态胶质液泡稳定性模型，该模型的预测与实验数据符合一致。 （c） 胶质液泡体系传质实验 应用筛选得到的含溶质的稳定胶质液泡，实验考察了搅拌速率、温度、溶质浓度、表面活性剂的种类和浓度等对胶质液泡体系传质过程的影响，同时分析讨论了胶质液泡体系能否发生Marangoni效应。 （d） 胶质液泡体系传质模型的提出及验证 提出了胶质液泡体系传质数学模型，在表面活性剂浓度小于临界胶束浓度时，主要的传质阻力来自于表面活性剂界面吸附层，而在大于临界胶束浓度时，界面阻力将保持不变，但形成的胶束（或反胶束）将会影响溶质传递过程，增加传质阻力。根据提出的传质模型，对溶质传递过程进行最优化数值模拟，发现模型预测值与实验数据的一致性很好。 |
| 英文摘要 | In this study, the mass transfer mechanism of meso-scale droplet colloidal liquid aphrons (CLAs) is investigated experimentally and the mass transfer process in CLA system is simulated numerically. The work consists of four parts: (a) Screening the stable solute-containing CLAs The influence of organic solvent polarity, type and compounding of surfactants and addition of solute into organic solvent core on CLAs stability was investigated. The CLAs selected for mass transfer experiments are formulated by: cyclohexane as organic solvent, benzoic acid as solute, and surfactant pairs are SDS+Tween-20, SDBS+ Tween-20, SDS+Span-20 and SDBS+Span-20. (b) Proposing the model of CLAs stability The effect of organic solvent polarity and electrolyte concentration on stability of dispersed CLAs has been investigated by electrical conductivity. In view of the experimental results and the CLAs distabilizing factors, the stability model of dispersed CLAs is proposed. The model correlates very well the experimental data in aqueous solution with different electrolyte concentration. (c) Mass transfer experiment in CLA system With the screened stable solute-containing CLAs, the CLAs mass transfer mechanism has been analyzed and evaluated based on experimental data. The effect of stirring speed, temperature, solute concentration, types and concentration of surfactants on the mass transfer processes are investigated. And the possibility of occurrence of the Marangoni effect in CLA systems has been discussed. (d) Proposing the mass transfer model and its validation A mathematical model of solute transfer in the CLA systems has been proposed. When surfactant concentration below its CMC, the resistance is mainly caused by the surfactant adsorbed on interface. And when surfactant concentration above its CMC, the interfacial resistance becomes almost a constant, the increase of system resistance may be further contributed by the formation of micelles or reserve micelles. The solute transfer process in CLA systems is simulated in terms of the proposed mathematical model. The optimal model parameters are resulted from numerical simulation and the least square data fitting, and also the mass transfer model is validated. |
| 语种 | 中文 |
| 公开日期 | 2013-09-13 |
| 页码 | 129 |
| 源URL | [http://ir.ipe.ac.cn/handle/122111/1246]  |
| 专题 | 过程工程研究所_研究所（批量导入） |
| 推荐引用方式 GB/T 7714 | 何艺. 胶质液泡传质特性和机理研究[D]. 过程工程研究所. 中国科学院过程工程研究所. 2008. |
入库方式： OAI收割
来源：过程工程研究所
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