By R. Zarzycki, A. Chacuk and J.M. Coulson (Auth.)
This e-book provides a pragmatic account of the trendy thought of calculation of absorbers for binary and multicomponent actual absorption and absorption with simultaneous chemical response. The publication contains elements: the idea of absorption and the calculation of absorbers. half I covers simple wisdom on diffusion and the speculation of mass move in binary and multicomponent platforms. major rigidity is laid on diffusion thought simply because this kinds the root for the absorption procedure. within the subsequent chapters the basics of simultaneous mass move and chemical response, the idea of the desorption of gases from beverages and the formula of differential mass balances are mentioned. half II is dedicated to the calculation of absorbers and the class of absorbers. The chapters current calculation tools for the fundamental varieties of absorber with a close research of the calculation equipment for packed, plate and bubble columns. The authors illustrate the provided fabric with a number of examples, beginning with basic ones for binary structures and finishing with column calculation for multicomponent systems.
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3-2. 2 Κ b) ammonia (polar) - oxygen (nonpolar) at temperature Τ = 2 9 3 . 2 Κ. In both cases diffusion occurred under atmospheric pressure. 681 Χ 10" + 4 . 418X10" ε Ik = 230 Κ A σΑΏ B 10 Β m 10 £ A ß / k = V(fi A /k)(e B /k) = V 9 1 . 5 X 10" m /kmol dA From Table 3-3: V 3 xioAB 11 Ρ (V 3 τ · 5 J '/ 3++ 1 3J 2 dB ' 1 r j _ 7 5 YV "' )) d A M ί j _ ) + i n M A B J 1 7 5 ^ + i M ï ï 7 L 5 J. 013 χ 1 0 [ ( 1 8 . 5 x 1 0 ' ) 5 1/2 ·\ r 5 9 . 41 x l O " 3 = ( 2 x 1 5 . 9 + 6 x 2 . 4 Κ, Τ sA A B S A s ( SA SB) T T +V v) V !
The theory of diffusion in liquids, although very advanced, does not provide results which can be used directly in practice. That is why in calculations some similarity between diffusion in gases and liquids is assumed. Agreement of this approach with reality is obtained when a semi-empirical character is given to constitutive relationships and formulae for diffusion coefficients. 1. Molecular Diffusion in the Kinetic Theory of Gases The Model of Rigid Spheres. A surprisingly accurate description of transport properties of gases can be obtained using a fairly unrealistic model of a gas: a) molecules are rigid, non-attracting spheres of diameter mass m (molecular weight of gas is M ) d^ and DIFFUSION b) all molecules move at the same velocity ω c) all molecules move parallel to one of the coordinate system.
8 6 x 10" (370 ) 5 1 1 17 . 013x1 0 [ ( 2 0 . 01 + (18 . 25xl0" m /s 5 2 9 . 013X10 1 1 17. 7xl0" ) 5 3 1 / 3 + 1 32 . 00 1/2 ( 1 6. 31xl0" m /s 5 2 9 . 5xl0" ) 5 3 1 28 . 96xl0" m /s 5 2 According to the Enskog-Chapman theory, changes in Φ.. 11xl0" il = « 125 Χ 1 0" ο ρ 1 0 1 3 X 10 (3-Β2) 3 thus, they would not depend on the mixture composition. 11χ10" Φ 3 $ (3-B3) The correction can be calculated by Takahashi's method Φ = A(l-Br )(l-DT^ ) C E (3-B4) where coefficients A, B, C, D and Ε depend on reduced pressure.
Absorption. Fundamentals & Applications by R. Zarzycki, A. Chacuk and J.M. Coulson (Auth.)