NDLI: Extended Short Cycle Time Analysis of Pressure Swing Adsorption with Nonlinear Adsorption Isotherm

Content Provider	Springer Nature Link
Author	Nakamura, Takuya Kodama, Akio Goto, Motobu Hirose, Tsutomu
Copyright Year	2005
Abstract	A set of differential equations of material balance for a twin column, two-step PSA (Pressure Swing Adsorption) was expanded into a power series of small value of half cycle time tc. The effect of finite value of cycle time on the time average product concentration CA1 started with the second order term and was interpreted by an additional resistance of mass transfer due to the difference in adsorbed amount between adsorption and desorption steps. Finally the column height L or NTU(NA = KA amL/u) required to obtain a given concentration of product gas CA1 was given by the following closed form equation for both linear and nonlinear isotherms $$\bigg\{{\frac{1}{N_A} + \frac{u_A}{u_D}\frac{1}{N_D} + \frac{1}{\nu _\Delta}} \bigg\}^{- 1} = \int_{C_{A1}}^{_ 1} {\frac{dC_A}{G(C_A) - G(C_D)},}\quad \hbox{with}\quad C_D = \frac{p_D}{p_A}C_{A1} + \frac{u_D}{u_A}(C_A - C_{A1})$$ in which parameters Ka, L, m, p and u are overall volumetric mass transfer coefficient, column length, adsorption coefficient, pressure and superficial gas velocity, respectively. Subscript A and D refer to adsorption and desorption steps. The function G(C) is a dimensionless adsorption isotherm and the term 1/νΔ is the above mentioned additional mass transfer resistance proportional to square of tc. The performance prediction by the equation agreed well with more rigorous numerical solutions over a wide range of cycle time by introducing the additional resistance 1/νΔ. The concentration swing Δ CA1, i.e. concentration difference during a half cycle time, was also discussed in a frame of the same concept.
Starting Page	609
Ending Page	614
Page Count	6
File Format	PDF
ISSN	09295607
Journal	Adsorption
Volume Number	11
Issue Number	1
e-ISSN	15728757
Language	English
Publisher	Kluwer Academic Publishers
Publisher Date	2005-01-01
Publisher Place	Boston
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	adsorption pressure swing adsorption short cycle time approximation analytical solution Industrial Chemistry/Chemical Engineering Engineering Thermodynamics, Transport Phenomena Surfaces and Interfaces, Thin Films
Content Type	Text
Resource Type	Article
Subject	Chemistry Chemical Engineering Surfaces and Interfaces

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