针对传递模型抽象、工程实践性强、计算过程复杂的"化工原理"课程,采用传统的教学方式与学习形式已无法满足学生个性化学习与创新人才培养的要求.本研究基于网络教学平台构建了"化工原理"混合式翻转课堂教学模式.在创新教学设计与课程内容的基础上,从学习 目标、学习形式、学习统计和学习评价四个环节出发,设计并开展了教学全过程的研究与实践,各环节贯穿课前、课堂和课后三阶段且相互关联,以更优的循环状态重塑课堂角色,优化教与学全过程.

为了进一步提高学生自主学习能力、创新思维能力和工程实践能力,立足“互联网+教育”时代背景,构建了一种线上线下混合教学方法.从线上师生互动、线上线下学生自主学习、课程设计及项目化实验教学等方面阐述了教学改革的方案设计和具体实践过程.结果 表明,新的教学方法更加有利于学生学习效率和综合能力的提升.

通过对三种传递过程关系式的分析,获得了可以作为传递过程教学理论基础的通用传递现象基本方程.通过分析精馏单元操作中的传递现象,表明了传递过程在精馏单元操作过程中的理论基础和实践作用.同时对构建传递过程与单元操作相关联的新型教学模式进行了探讨.

The determination methods (including sample dissolving and instruments etc.) of heavy metals,such as Ca,Na,V,Fe,and Ni,in the FCC (fluid catalytic cracking) equilibrium catalyst were compared.Microwave digestion and wet acidolysis were adopted to dissolve samples,and flame atomic absorption spectrometry,ICP,and X ray fluorescence were employed to determine above-mentioned five elements.To find a testing method for heavy metals in equilibrium catalyst in FCC,the economical efficiency,convenience,safety,and accuracy of the method were considered.After test and discussion,the determined method was to use microwave digestion to dissolve sample,and using ICP for measurement.This method was simple,safe,high accurate,and economically feasible.

The band structures, density of states, formation energies and optical properties of different concentration Br and I doped BiOCl systems were investigated via first principles based on the density functional theory. The results show that the incorporation of Br 4p and I 5p orbitals can reduce the energy gap of BiOCl, and then broaden the photo-absorption range. The calculated formation energy indicates that Br-doped BiOCl system has higher stability than I-doped BiOCl at the same doping concentration. For B, C, N, Si, P, S doped BiOCl systems, the impurity energy levels are mainly contributed to the np states of doping elements, which can make the red-shift of photo-absorption band edge into visible light region. Especially, the impurity levels of S-doped BiOCl system located in the top of valence band are difficult to become recombination center of photon-generated carriers, which can result in the reduction of BiOCl band-gap and the red-shift of light-responding scope. The S-doped BiOCl system will be a preferable modification method to improve the photocatalytic activity of BiOCl.

Aliphatic pinacol (C-6) was prepared for the first time by photocatalytic C-C coupling of isopropanol in an aqueous solution at room temperature by using Pt/TiO2 catalyst. The phase and pore structure of TiO2 was modulated by calcination of the commercial TiO2 at 500-900 degrees C. High isopropanol conversion was achieved when the commercial P25 TiO2 was calcined at 600 degrees C for 20h, and the highest pinacol yield was of 14.7% at the photocatalytic reaction of 20 h. (C) 2013 Elsevier B.V. All rights reserved.

Liquid-phase epoxidation of styrene with atmospheric O2 was conducted over CoAPO-5 molecular sieves. The catalytic performance of CoAPO-5 can be significantly improved by alkali metal salt impregnated on it, and styrene conversion and selectivity to styrene oxide reached 85% and 69% respectively when CsCl was impregnated on it. The catalyst was recyclable and exhibited similar catalytic activity and selectivity even after three catalytic reaction cycles.

The existing problems of the washing and eluting crude benzene process in the coking industry was introduced.In order to increase the recovery rate of crude benzene,improve the product quality and production stability,and reduce steam consumption,six effective measures had been taken,which include: improving the cleaning process of the final cooling tower,using an efficient and new type of packing in the wash benzene tower and an efficient and new type of VST in the benzene removal tower,increasing the amount of circulation of the washing oil,changing the oil-rich regeneration to depleted oil regeneration,increasing the oil heat exchanging area.

The isocyanide ability of chloroaniline was quantum-chemical calculated.Based on the study of geometry optimization,thermodynamic analysis and charge distribution analysis,the isonyanate reaction degree of chloroaniline was theoretically determined.The isonyanate reaction degree of chloroaniline was:p-chloroaniline m-chloroaniline o-chloroaniline.The study of synthesis of chlorophenyl isocyanates shows that the yield of o-chlorophenyl isocyanate,m-chlorophenyl isocyanate and p-chloro-phenyl isocyanate could respectively be 85.6%,87.2% and 91.5%.The experimental results consistent with the results of theoretical calculation.

通过对传热和吸收过程速率的比较,阐述了相似性原则在《化工原理》教学中的具体应用。

Y,Beta,ZSM-5,MOR,and MCM-22 zeolites,with different structures and surface characteristics,were employed as supports.A series of zeolite supported Co catalysts were prepared by ion-exchange and characterized by XRD,UV-vis and elemental analysis.The catalytic performance of the prepared catalysts in liquid-phase oxidation of cyclohexane by molecular oxygen was investigated.The results showed that the properties of zeolite supports had great influence on catalytic performance of the prepared Co supported catalysts for liquid-phase oxidation of cyclohexane.Among the prepared five zeolite supported Co catalysts,Co/Y exhibited the highest selectivity for the mixture of cyclohexanol and cyclohexanone(KA oil) in cyclohexane oxidation under identical reaction conditions.About 15.9% conversion of cyclohexane and 79.0% selectivity of KA oil could be obtained in cyclohexane oxidation catalyzed by Co/Y catalyst at 130℃ under O2 pressure of 1.2 MPa after reaction of 6 h.Under the investigated reaction conditions,Co/Y was recyclable in cyclohexane oxidation and the conversion and selectivity changed slightly after five runs.

Solid phosgene becomes the ideal phosgene substitutes because of its characteristic of safety,convenience and so on.The physical and chemical properties of solid phosgene was presented.The application research of solid phosgene in the reaction with carbon,nitrogen and oxygen nucleophilic body and others was emphatically expounded.The widespread use of solid phosgene in pharmaceutical,pesticide,polymer etc was described.

Chlorotrimethylsilane is a very important silanization reagent.The physical and chemical properties of chlorotrimethylsilane were presented.The application research of chlorotrimethylsilane in chromatographic analysis,organic synthesis,protection of groups and others were emphatically expounded.

The optimized geometry configurations,thermodynamic,and charge distribution were analyzed.Academically degree of nitro-substitution aniline isocyaniding was in the sequence of m-nitrophenyl anilinep-nitrophenyl anilineo-nitrophenyl aniline.The synthetic process of triphosgene and o-nitrophenyl aniline,m-nitrophenyl aniline,p-nitrophenyl aniline as raw material to synthesize corresponding isocyanates was optimized.It as found that ethyl acetate was the best solvent,the optimum reaction time of synthesis of o-nitrophenyl isocyanate,m-nitrophenyl isocyanate,and p-nitrophenyl isocyanate was 6 h,6 h,5 h,respectively.The optimum molar ratio of o-chloroaniline,m-chloroaniline,p-chloroaniline,and triphosgene was 2∶1,2.2∶1,2∶1,respectively.Under the optimized conditions,the yield of o-nitrophenyl isocyanate,m-nitrophenyl isocyanate,and p-nitrophenyl isocyanate respectively was 75.5%,76.9%,and 77.1%.The purity of o-nitrophenyl isocyanate,m-nitrophenyl isocyanate and p-nitrophenyl isocyanate was 99.6%,99.16%,85.7%,respectively.The experimental results were consistent with the theoretical simulation.

Synthetic ammonia is a pillar industry of chemical industry.Ru-based catalyst is a supporting catalyst which has high reactivity under low pressure and low temperature,so substantial work has been done by researchers all over the world.This review deals with the study progress,catalytic mechanism and industrial application of the new type of Ru-based catalyst for ammonia synthesis,which emphases the impact of parent compound,carrier and promoter in the catalyst on the catalyst activity.

综述了各种聚合物纳米复合材料的制备方法,重点介绍了聚苯乙烯纳米复合材料的制备及研究进展.