VACUUM SORPTION PUMPING STUDIES WITH PURE GASES ON MOLECULAR SIEVES.

被引：0

作者：

Crabb, K.S. ^{[1
]}

Perona, J.J. ^{[1
]}

Byers, C.H. ^{[1
]}

Watson, J.S. ^{[1
]}

机构：

[1] Oak Ridge Natl Lab, Oak Ridge, TN,, USA, Oak Ridge Natl Lab, Oak Ridge, TN, USA

来源：

Reactive polymers. Ion exchangers, sorbents | 1985年 / 5卷 / 03期

关键词：

CARBON DIOXIDE - Adsorption - MASS TRANSFER - Mathematical Models - MATHEMATICAL TECHNIQUES - Numerical Methods - MOLECULAR SIEVES - Surface Properties - NITROGEN - Adsorption;

D O I：

10.1016/0167-6989(87)90240-6

中图分类号：

学科分类号：

摘要：

Low-pressure, low-temperature adsorption of N//2 and CO//2 was studied in beds of 4A molecular sieves. System parameters were estimated by a comparison of experimental results and a molecular-flow theoretical model. The general objective of the work was to develop a mathematical model to describe quantitatively the mass transfer in a deep-bed cryosorption pump. A set of equations describing these processes was derived from theory, and a numerical solution of the set was developed. Major assumptions in the theoretical model were: isothermal conditions, parabolic concentration profile within the sorbent particles, equilibrium adsorption isotherms represented in a Langmuir form, and concentration-independent solid diffusion controlled by either the intracrystalline or the macropore structure.

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