课程名称︰分离程序 课程性质︰化工系大三必修 课程教师︰刘怀胜 开课学院：工学院 开课系所︰化工系 考试日期（年月日）︰2020.06.18 考试时限（分钟）：100 min 试题 : Closed Book: 1.(30%) Explain following terms briefly. 1) Asymmetric membrane 2) Molecular weight cut off and rejection coefficient 3) Psychometric ratio 4) Concentration polarization 5) Percentage relative humidity and percentage humidity 6) Cation exchange membrane 7) Polymorhism in crystallization 8) Enantiotropic and monotropic in crystallization 9) Critical moisture in drying 10) Reynold analogy 2.(10%) Please derive the so-called Langmuir isotherm with clear assumptions. 3.(10%) What are the possible mechanisms of membrane fouling? And what are the ways to eliminate or reduce fouling? 4.(10%) Please discuss the difference between primary nucleation and secondary nucleation from the point of solubility, rate, size distribution, and controllability. Open book: 1.(24%) The attach chromatographic results indicated the effect of different injected sample volumes. Please explain (1) what causes the distortion of the peaks and (2) why the distortion almost invisible for small volume of samples and (3) what type of isotherm that you expect. 2.(26%) A mixture containing 50% acetone and 50% water is to be contacted with an equal amount of MIK, (a) what fraction of the acetone can be extracted in a single-stage process? (b) what fraction of the acetone could be extracted if the fresh solvent were devided into two parts and two successive extraction used. --

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