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关键词： 生物工程   膜分离  

摘要： 生物工程中的分离过程是一个重要的后处理操作单元。近几年来,膜技术以其独特的性能在这个操作单元中的应用迅速增加。本文就生物工程中经常涉及的反渗透膜、超滤膜、微滤膜、电渗析膜、气体分离膜和液膜六种膜分离过程,分别从工程原理、膜结构及性能、膜制备方法、应用中存在的问题以及主要的应用领域诸方面作了较详细的阐述。

ISBN: (纸本)7502502947

关键词： CHROMATOGRAPHY   PROTEIN PURIFICATION   ION EXCHANGE   GEL FILTRATION  

摘要： The engineering considerations common to large scale chromatographic purification of proteins are reviewed. A discussion of the industrial chromatography fundamentals is followed by aspects which affect the scale of separation. The separation column geometry, the effect of the main operational parameters on separation performance, and the physical characteristics of column packing are treated. Throughout, the emphasis is on ion exchange and size exclusion techniques which together constitute the major portion of commercial chromatographic protein purifications. In all cases, the state of current technology is examined and areas in need of further development are noted. The physico-chemical advances now underway in chromatographic separation of biopolymers would ensure a substantially enhanced role for these techniques in industrial production of products of new biotechnology.

关键词： 油气分离器   柴油机   油耗   测量  

摘要： 作业燃油消耗量是评定工程机械性能的主要经济指标,在工程机械测试中,一般采用容积式油耗计测量。对于回油量较大的柴油机,特别是装有PT泵供油系统的柴油机(如寇明斯发动机,其回油量大约占供油的80%),由于回油中含大量汽泡,因而给油耗的准确测量带来较大的困难。

关键词： 化学工程   手册   气溶胶   分离   颗粒   化学工程   手册  

关键词： 膜分离   膜分离  

摘要： 一、前言现代高分子膜分离技术的发展历史约有40年。近20年来,膜分离技术成为各国科研人员研究的热门课题,这是因为分离工程是许多工业过程极为重要的组成部分,其开发难度大,占有工程投资和生产费用多,因而积极开发新的分离技术,始终是工程技术界的迫切任务。此外,新科学技术的发展,新产业部门的兴起,也需要新的分离技术。例如微电子工业要求提供纯净的工艺用水;

关键词： 液液传质分离   数学模型   计算  

摘要： 本文将扩散模型与多级返流模型用于描述液液两相逆流传质分离过程.采用两相稳态浓度剖面法或传递组分动态响应法拟合求取模型参数.计算方法可分别采用三参数方法或单参数法(理想浓度剖面方法).两种模型和不同的模型参数估值方法可适用于不同的过程特点及需要.对模型参数估值方法的稳定性进行了分析和讨论.

关键词： Mixtures  

摘要： Multistage equilibrium separation processes involving binary homogeneous mixtures are analyzed. For several sets of specifications, it is shown that these process models admit a unique steady-state solution without the need for a constant molar overflow assumption or other energy balance or phase equilibria simplifications. The steady-state model equations are analyzed directly, and the role of homogeneity in determining solution uniqueness is clearly identified. The analysis is constructive and gives insight into the behavior and development of algorithms for solving multistage separation process model equations in both the binary and multicomponent cases. To illustrate this, convergence results are established for direct substitution and certain Newton-like accelerated direct substitution methods. Also, a new generalized Broyden acceleration technique is developed and used in the context of a sum-rates algorithm to solve several example problems. Numerical results show that the proposed acceleration method is comparable to Newton acceleration and clearly outperforms traditional Broyden acceleration. Other properties predicted by the analysis are also illustrated. © 1989, American Chemical Society. All rights reserved.