The molecular thermodynamic model for chain-like molecule fluids presented in the previouswork is extended to the calculation of liquid-liquid equilibria of polymer systems.the liquid-liquidequilibria of polymer blends with upper-critical-solution-temperature(UCST)and lower-critical-solution-temperature(LCST）can be satisfactorily correlated by using two interaction parameters k_12 and Good agreements can also be obtained between calculated and experimental liquid-liquid equilibri-um of polymer solutions with LCST．

The fluidization of cohesive particles of different sizes shows that the fluidization characteristics are greatly affected by the size of particles.The smaller the size of particles,the larger the interparticle forces,and the worse the fluidization behavior.The natural agglomerate number Ae_n and the fluidized agglomerate number Ae_f，which can be used to describe the fluidization behavior of particles,are proposed on the basis of balance of forces between the agglomerate and the outer-most cohered particles.The calculation of the fluidzed agglomerate number Ae_f shows that cohesive particles can be fluidized if the fluidized agglomerate number Ae_f≤40000．

Fe_3O_4,FeO and their mixture were Prepared by using high temperature fusion method with magnetite and reducing reagent as raw.The physicochemical properties and crystal structure and activity of the catalyst with iron oxides as precuesor were investigated.The activity order of ammonia synthesis on iron oxide was proposed and the order of activity is as follows:Fe_(1-x)O＞Fe_3O_4＞Fe_2O_3＞mixture of any two iron oxides.

A catalytic distillation process for the hydrolysis of methyl acetate was established,and its characteristics and applicability were discussed.A general mathematical model for catalytic distillation columns was proposed and the solution method was given.This model is applicable to the two types of catalytic distillation columns where reaction and distillation proceed simultaneously or alternatively.This model can also be used for the dynamic analysis of catalytic distillation columns．

A three- dimensional mixing-pool model of a distillation column containing structured packing was established,in which liquid flow distribution and mixing were considered.The closure of model equations was analyzed and the methods of computing the flow and mixing parameters in the model were given.As the solution of an exact model is time consuming,a simplified model and the method of solution were proposed．

The distillation experiment performed by Gorak was simulated with sufficient accuracy by using the simplified three-dimensional mixing-pool model.The effect of liquid distribution and mixing behavior on distillation column containing structured packing was studied by numerical method with the simplified three-dimensional mixing-pool model.It was found that the axial backmixing of liquid phase has a pronounced negative effect on separation.The three-dimensional model should be used for simulating the cases of serious wall flow and/or serious channeling flow.Lateral mixing is favorable to the separation,but for the corrugated sheet structured packing,the loss of separation efficiency due to nonunifom liquid distribution cannot be completely compensated,even with infinite lateral mixing along the extending direction of packing sheet.

A systematie testing of unsteady state oxidation of low content SO_2 by periodic flow reversa1 was carried out in a bench-scale reactor packed with 4.58 L domestic commercial vanadium supported catalyst,S108.The effects of SO_2 content in feed,superficial velocity of gas,preheated temperature of the catalyst bed and operation period on transient temperature profiles and its peak values,time-average conversions and the propagation velocities of the thermal wave were observed.It was shown that periodic flow reversal of fixed-bed catalytic reactor certainly had considerable advantage of conventional steadystate operation especially for reversible exothermic reaction with low content reactant.The results obtained in this investigation would be used to compare with those predicted by mathematical model and to identify the global kinetic parameters in the best-fit model.

The extraction and stripping of cadmium and zinc with di-（2-ethylhexyl)-dithiophosphoric acid（D2EHDTPA）in toluene and by D2EHDTPA-trioctylamine in toluene were investigated.The constant molar extraction,infrared spectrum analysis and nuclear magnetic resonance spectrum analysis confirmed that the probable structures of extracted complexes were CdA_2 and ZnA_2.Cadmium can be extracted very easily by D2EHDTPA.Cadmium is almost completely extracted,but stripping of cadmium from the organic phase is very difficult.With the newly developed synergistic extraction system of D2EHDTPA-TOA,high selectivity for the extraction of cadmium from zinc sulfate solution and easy stripping of cadmium from the organic phase can be obtained.Kinetic study showed that the interfacial reactions were the extraction rate determining steps of the extraction process.

In this paper,a Back Mapping Principlal Component Analysis method based on the analysis of the PCA is proposed.This method is compared with other modeling methods usually used in chemical processes in an example of pressure drop model for a hydrocracking reactor.

By using the principles of conservation of mass and momentum in both spout and annular regin,a model was developed for describing the characteristics of particle residence time in a continuous spout-fluid bed with a draft tube.The calculation based on this model agreed with the experimental data reported before.

A mathematical model for simulating the longitudinal distribution of pH in MFE（Multichannel Flow Electrophoresis) is proposed on the basis of mass transfer analysis of electrophoresis and electrolysis equilibrium of electrolytes.This model was used for selecting suitable operating conditions to establish an expected pH gradient with conventional electrolyte,which is of essential importance in achieving a high resolution in an electrophoresis process conducted in multicompartment electrolyzer.A numerical solution was developed on the basis of Gear method.The calculated results agreed well with the experimental data in a wide range of applied potential and protein concentration in solution.This model may also be applied to other ampholyte-free electrophoresis processes conducted in the multicompartment electrolyzer.

The tortuosity factors of the silver catalyst for ethylene oxide formation with hollow cylindrical shape were measured by classical steady state and dynamic state method (SPSRM).The experimental results of the two methods were almost the same.A new calculation method and an on- line analysis technique with computer were used in SPSRM.These improvements can make the SPSRM experiments more convenient,simple and reliable.A new method for measuring effective thermal conductivity of solid catalyst was developed.The method is simple,convenient and accurate and can be used to plate,cylinder and other shape solid catalysts without changing the shape and physical structure at any reaction temperature.The effective thermal conductivities of ethylene oxide synthesis catalyst with hollow cylindrical shape were measured with this method.Experimental results were used to calculate the distribution of components,temperature and selectivity within the silver catalyst.The calculation results agreed well with experimental data of global kinetics.

In this paper,the intrinsic kinetics of ethylene oxidation to ethylene oxide was studied in a constant temperature integral reactor under conditions similar to industrial production.The intrinsic rate equations were obtained.The two-dimension mathematical model of multiple reactions-mass transferheat transfer coupling process in hollow cylinder silver catalyst was set up.No assumption was made in this model.All parameters were obtained by experiments.

The two-dimensional mathematical model of the coupling process of multiple reactions-mass transfer-hear transfer in the hollow cylindrical silver catalyst was solved by the orthogonal collocation method on finite elements.The calculated results agreed well with experimental data.

The present paper is a review of the recent research work on the methodology for predicting the occurrence of failure events for process equipment at home and abroad.The focal point is the study progress and some effective cases in practice,which is based on the principles of approximate and plausible reasonings for uncertain parameters of fuzziness, quantitative metallographic technique and artificial neural networks method.The prediction involves failure probability, serious ness of failure events,damage of structural materials, remaining life and safety,etc．

VLE data for a ternary system（propylene - methanol - water）under30～60℃,0.3～0.9MPa with the mass ratio of methanol to water 9:1, 8:2,7:3 were determined with static equilibrium still,and correlated by using UNIQUAC-RK model.The results indicated that the models were suitable for the temary system and the data were reliable．

Based on the second law or the rmodynamics,the authors proposed the unit entropy generation analysis method for evaluation and analysis of the comprehensive thermal characteristics of different enhanced heat transfer methods.The optimum operation condition of the enhanced heat transfer methods,such as fin type and swirl flow,is obtained through thermal characteristic analysis.This work provides a theoretical basis for engineering design.

The coexisting densities of equilibrium liquid and vapor phases,density profile,interfacial thickness and surface tension of homonuclear diatomic molecular fluids were studied by using the isothermal-isochoric molecular dynamics（MD）simulation method.It was found that the equilibrium densities of liquid and vapor phases were in agreement with the results from Monte Carlo（MC）simulation.The thickness of Liquid-vapor interface increased as temperature went up,but surface tension showed the opposite tendency.The influence of temperature on interfacial thickness was stronger in the range of higher reduced temperature.In addition,the molecular anisotropy also had an effect on interfacial properties of homonuclear diatomic molecular fluids.