The solubilities of benzoic acid in supercritical CO2 with pure and mixed cosolvent were measured at pressures from 8.0 to 23.0MPa and 328. 15Kfor pure cosolvent, and 308. 15, 318. 15 and 328. 15Kfor mixed cosolvent. The experiments were carried out by using a flow-type phase equilibrium apparatus. The effect of cosolvents, ethyl acetate, ethanol and ethyl acetate + ethanol (molar ratio 1:1) was studied at the concentration of 2.0 mol%. The results showthat the solubility enhancement follows the order: ethanol > ethyl acetate + ethanol > ethyl acetate. The measured solubilities were correlated using a modified Chrastil equation, and the calculated results are in good agreement with the experimental data.

Five kinds of expanded polytetrafluoroethylene (ePTFE) flat membranes with different porosity and micro-pore size were chosen to carry out the unsteady state gas absorption experiments. The influence of the membrane porosity and micro-pore size on the membrane absorption process was investigated. Experimental results showed that the membrane porosity had an impact on the membrane absorption process, and the degree of this impact depended on the absorption system and the membrane pore size. For a rapid mass transfer process, the porosity affected the mass transfer more significantly, while for the slow mass transfer process the porosity almost did not affect the mass transfer. The modeling analysis showed that the porosity affected the concentration profile of the solute near the membrane surface on the liquid side, which led to the reduction of the mass transfer area of the membrane. Hence, the apparent effect on the mass transfer of the membrane absorption process.

Based on the membrane-based absorption experiment of CO2 into water, shell-side flow distribution and mass transfer in a randomly packed hollow fiber module have been analyzed using subchannel model and unsteady penetration mass transfer theory. The cross section of module is subdivided into many small ceils which contains only one hollow-fiber. The cross sectional area distribution of these cells is presented by the normal probability density distribution function. It has been obtained that there was a most serious non-ideal flow in shell side at moderate mean packing density, and the large amount of fluid flowed and transferred mass through a small number of large voids. Thus mass transfer process is dominated by the fluid through the larger void area.. The mass transfer process in each cell is described by the unsteady penetration theory. The overall mass transfer coefficient equals to the probability addition of the mean mass transfer coefficient in each cell. The comparisons of the values calculated by the model established with the empirical correlations and the experimental data of this work have been done. The predicted overall mass transfer coefficients are in good agreement with experimental data.

采用光学纹影摄影方法观察了多组分蒸发、吸收和解吸过程中相界面处的对流现象。自然蒸发过程所研究的物系为苯／甲苯二元混合物和乙酸亿酸乙酯亿二醇三组分混合物，气液传质过程包括甲醇、异丁醇等分别吸收二氧化碳的吸收过程和二氧化磺从有机溶剂中解吸的过程。结果发现，在多组分有机液体混合物蒸发和气液传质过程中存在规则有序滚桶形或多边形细胞状对流，这说明有序对流运动的产生是相际传质过程中普遍存在的现象，其结构特点取决于实验条件和体系的性质。

推导和建立了描述超临界流体填料萃取塔两相流体力学特性的数学模型。在25mm内径的连续逆流填料萃取塔中，应用超临界二氧化碳-异丙醇-水、超临界二氧化碳-乙醇-水2种实验体系和金属扳渡、金属丝阿日θ环2种填料对流体力学模型进行了实验验证，计算结果与宴验数据符合较好。