Interphase transport and multistage separations. Final report, September 1, 1984--August 31, 1994

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This report gives a summary of the research accomplished under this project which included: Collocation analysis of multistage separation systems; Heat and mass transport fundamentals; Fractionation tray modeling; and Computational and statistical methods. The large equation sets encountered in tray-by-tray modeling of distillation systems are a major obstacle in computer-aided process engineering. The authors addressed this difficulty by approximating the multistage equations with much smaller sets, obtained by orthogonal polynomial interpolation over the stages. A new approach to column design was initiated when they discovered how to extend their collocation formulas to modules containing non-integer numbers of stages. This extension ... continued below

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6 p.

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Stewart, W. E. August 4, 1994.

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Description

This report gives a summary of the research accomplished under this project which included: Collocation analysis of multistage separation systems; Heat and mass transport fundamentals; Fractionation tray modeling; and Computational and statistical methods. The large equation sets encountered in tray-by-tray modeling of distillation systems are a major obstacle in computer-aided process engineering. The authors addressed this difficulty by approximating the multistage equations with much smaller sets, obtained by orthogonal polynomial interpolation over the stages. A new approach to column design was initiated when they discovered how to extend their collocation formulas to modules containing non-integer numbers of stages. This extension proved equally useful for column simulations in the presence of more than one liquid phase. They also investigated strategies to handle locally steep concentration profiles and high-purity separations. As a basis for realistic modeling of fractionating trays, a comprehensive comparison of various computation methods for multicomponent mass transfer was undertaken. A theoretical study was carried out for asymptotic forms for heat and mass transfer rates in boundary layers. Newton`s method was used in several of the computational algorithms for equation solving, parametric sensitivity analysis and nonlinear parameter estimation. The authors investigated modifications of the Newton method designed to achieve convergence over a wider range of initial guesses. Other computer codes have been enhanced as a result of this project.

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6 p.

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OSTI as DE95011594

Medium: P; Size: 6 p.

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  • Other Information: PBD: 4 Aug 1994

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  • Other: DE95011594
  • Report No.: DOE/ER/13291--T1
  • Grant Number: FG02-84ER13291
  • DOI: 10.2172/71289 | External Link
  • Office of Scientific & Technical Information Report Number: 71289
  • Archival Resource Key: ark:/67531/metadc703382

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Office of Scientific & Technical Information Technical Reports

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Creation Date

  • August 4, 1994

Start & End Dates

  • September 1, 1984 - August 31, 1994

Added to The UNT Digital Library

  • Sept. 12, 2015, 6:31 a.m.

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  • April 13, 2017, 12:41 p.m.

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Stewart, W. E. Interphase transport and multistage separations. Final report, September 1, 1984--August 31, 1994, report, August 4, 1994; Madison, Wisconsin. (digital.library.unt.edu/ark:/67531/metadc703382/: accessed December 18, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.