Supercritical Fluid Technologies: Preparation of Silica Aerogel and Adsorption of 2-Phenylethyl Alcohol

SiO2气凝胶是指由SiO2纳米粒子相互聚结构成纳米多孔网状结构，并在孔隙中充满气态分散介质的一种固态材料，也属于纳米材料的一种。因为其独特的三维网络结构以及高孔隙率、高孔容、高比表面积等物理性质，SiO2气凝胶可广泛应用于催化剂载体、传感器、气体分离等。超临界流体（SupercriticalFluid，SCF）技术为一项新型的绿色技术，在许多领域中获得了重要的进展。本研究主要采用SCF技术制备SiO2气凝胶粉体，并研究超临界CO2中香料2-苯乙醇在SiO2上的吸附行为。 采用水玻璃为原料，分别用硫酸催化法、柠檬酸催化法、离子交换法、碳化法制备SiO2湿凝胶。采用超临界干燥（Supercri...Silica aerogels are solid-materials with nano-porous network structure which are filled with gas dispersing medium in the pores. They also belong to nano-materials. Because of its unique three-dimensional network structure and high porosity, high pore volume and high surface area, silica aerogels can be widely used in catalyst supports, sensors, gas separations and so on. Supercritical fluid (SCF)...学位：工学硕士院系专业：化学化工学院化学工程与生物工程系_工业催化学号：2062008115162

Vapor-liquid-equilibrium and volume expansion calculations of CO_2/acetone,CO_2/ethanol and CO_2/ethanol/water at high pressure by using t-mPR equation of state

作者简介:蒋茂星(1983－),女,助教,主要研究方向:超临界流体技术 通信联系人:李军,教授,主要研究方向:超临界流体技术,[email protected][中文文摘]采用t-mPR状态方程(EoS)对CO2/丙酮、CO2/乙醇二元体系和CO2/乙醇/水三元体系的高压汽液平衡(VLE)、液相体积膨胀率进行计算,并与文献报道的实验数据,以及采用PR EoS得到的结果进行比较。结果表明,与PR EoS相比较,t-mPR EoS可以对上述二元体系的VLE取得较好的关联效果,对三元体系取得较好的预测效果。基于VLE的计算,进一步对上述体系的液相体积膨胀率进行预测。与PREoS相比较,t-mPREoS对二元体系的预测结果的精度有所提高,对三元体系在7.8MPa左右有最大体积膨胀率,模型预测较好。[英文文摘]The vapor-liquid equilibirum (VLE) and volume expansion of the liquid phases for the CO2/acetone and CO2/ethanol binary systems and the CO2/ethanol/water ternary system have been investigated using the t-mPR equation of state (t-mPR EoS). Calcualted results have been compared with published experimental data and those obtained from the PR equation of state (PR EoS). The correlations for the published VLE data of the above binary systems and the prediction for the ternary system showed that both the t-mPR EoS and the PR EoS can provide fairly good VLE calculations, but t-mPR EoS gives slightly better results. The volume expansion prediction for the above systems and the comparison with the published data showed that the t-mPR EoS gives better results to PR-EoS for the binary systems and provides more reasonable results around 7.8 MPa (there exists a maximum volume expansion) for the ternay system.高等学校博士学科点专项科研基金资助项目(20100121110009