教学课程资源库 更多>>

关键词： 课程教学   化工分离工程   Aspen   Plus软件  

摘要： 探讨了Aspen Plus软件在《化工分离工程》课程教学中的应用,并选取典型化工流程为模拟实例简要介绍了Aspen Plus的应用,提高了学生的学习兴趣,加深了学生对化工知识的理解,使学习紧密贴近实际化工过程。有助于提高学生的综合素质,实现"应用型化工人才"的培养目标。

关键词： Methods in magnetism   Quantum control   Quantum entanglement   Quantum phase transitions   XY model   1-dimensional spin chains   Exact solutions for many-body systems  

摘要： We discuss ground-state factorization schemes in spin S arrays with general quadratic couplings under general magnetic fields, not necessarily uniform or transverse. It is shown that, given arbitrary spin alignment directions at each site, nonzero XYZ couplings between any pair and fields at each site always exist such that the ensuing Hamiltonian has an exactly separable eigenstate with the spins pointing along the specified directions. Furthermore, by suitable tuning of the fields this eigenstate can always be cooled down to a nondegenerate ground state. It is also shown that in open one-dimensional systems with fixed arbitrary first-neighbor couplings at least one separable eigenstate compatible with an arbitrarily chosen spin direction at one site is always feasible if the fields at each site can be tuned. We demonstrate as well that in the vicinity of factorization, i.e., for small perturbations in the fields or couplings, pairwise entanglement reaches full range. Some noticeable examples of factorized eigenstates are unveiled. The present results open the way for separable ground-state engineering. A notation to quantify the complexity of a given type of solution according to the required control on the system couplings and fields is introduced.

关键词： Gas separations   Ladder-structured polysilsesquioxanes   Membranes   Substituent effects  

摘要： A comprehensive and fundamental gas transport study of ladder-structured polysilsesquioxanes(LPSQs) was systematically performed by investigating the effects of various alkyl substituents, different copolymer ratios, and UV-irradiation induced photo-crosslinking on gas separations. Overall, LPSQ membranes are more suitable for CO2/N-2 and CO2/H-2 separations due to are latively high affinity towards CO2 as well as rubbery polymer properties. The gas transportin LPSQ membranes was well interpreted by two important parameters, the inter-chain distance and the side chain mobility. A combination of larger inter-chain distance and higher side chain rigidity tends to increase the fractional free volume, resulting in higher gas permeability. Also, it was successfully demonstrated that the separation performance of LPSQ membranes can be predicted by using alogarithmic permeability relationship based on the transport characterization for a series of ladder-structured poly(phenyl-co-methacryloxypropyl)silsesquioxanes. Lastly, the UV-curing process reduced the permeability of LPSQ membranes, increasing the selectivity due to the restricted chain mobility. (C) 2016 Elsevier B.V. All rights reserved.

关键词： 甲醇制烯烃   分离技术   工程   产品回收率   自主知识产权   EPC总承包   稳定运行   性能考核  

摘要： 惠生工程（中国）有限公司（简称惠生工程）宣布由其EPC总承包并采用具有自主知识产权的烯烃分离技术的山东阳煤恒通化工股份有限公司（简称阳煤恒通）300kt/a甲醇制烯烃（MTO）项目,在经过十个月的稳定运行后,以优异的运行效果通过考核和验收,乙烯、丙烯产品回收率创下目前全球同行业最髙水平.在历时72h的性能考核期中,该烯烃分离单元实现满负荷稳定运行,产出的乙烯和丙烯产品质量均满足聚合级产品规格要求.

关键词： 膜分离技术   环境工程   应用  

摘要： 膜分离技术的应用对于环境工程起着重大作用,本文通过介绍膜分离技术的特点以及其与环境工程的关系,并且介绍了主要的几种膜分离技术在环境工程中的具体应用和存在的主要问题,希望通过这些方面的论述给我国今后膜分离技术在环境工程中的应用提供一些指导性意义。

关键词： 分离工程   教学法   教学实践  

摘要： 《分离工程》课程是高等教育工科专业重要的专业课之一,根据教学实践中存在的问题,提出了课程教学改革的一些新尝试。从课堂教学、实验教学、考核方式等教学环节的改革进行了探讨。教学过程中以学生为主体,教师为引导,调动学生的学习兴趣和能动思维,在教学过程中引入科研和实践教学环节的内容。实践证明,教学效率显著提高,教学效果良好。

关键词： Oil absorbent   Superhydrophobic   Superoleophilic   Separation   Interfacial modification  

摘要： In this study, the surface modified TiO2 nanoparticles have been synthesized with oleic acid and trifiuoroacetic acid (TFAA) as surfactants. The as-prepared TiO2 nanoparticles reveal small particle size with narrow distribution, excellent dispersibility and high hydrophobicity. By interfacial modifying the melamine sponge with the hydrophobic TiO2 nanoparticle, the wettability of the modified sponge can be tailored to be superhydrophobic to water while superoleophilic to oils. Combining with the porous structure of melamine sponge and the excellent hydrophobicity of the coated TiO2, the modified sponge exhibits large absorption capacity (up to 88.1 g/g for chloroform), good selectivity and high recyclability for a wide range of oils and organic solvents. The results indicate that the TiO2 modified sponges may potentially be useful as next-generation oil adsorbent materials. (C) 2016 Taiwan Institute of Chemical Engineers. Published by Elsevier B.V. All rights reserved.

关键词： 膜分离技术   环境工程   应用  

摘要： 膜分离技术的原理是,在液体混合物中,对不同组成成分的液体或者液体膜的选择通透性也是不相同的,膜的分离技术是指利用膜的选择选择渗透性的不同发挥其工作,借助外界能量、化学位差,对不同成分组成的气体和液体,进行分离提纯,在污水处理、食品、能源和化工生产中得到了广泛的应用,并且得到快速的发展,膜分离技术是一种新型的分离方法和传统的分离技术相比,其主要优点是工艺简单、消耗的能源比较小,不会造成二次污染,能够取得很好的分离净化效果。

关键词： 化工分离工程   Aspen   Plus   教学方法  

摘要： 化工分离工程是化学工程与工艺专业的一门专业技术课程,具有很强的应用性和工程性.在培养应用型人才的目标下,从化工分离工程课程内容中的相平衡方程、分离单元、分离流程和操作条件等几方面做了一些探索,将Aspen Plus应用于化工分离工程教学中,提高了学生学习的积极性和化工分离工程的教学效果.