By R. Zarzycki, A. Chacuk and J.M. Coulson (Auth.)
This e-book provides a pragmatic account of the trendy conception of calculation of absorbers for binary and multicomponent actual absorption and absorption with simultaneous chemical response. The e-book comprises elements: the speculation of absorption and the calculation of absorbers. half I covers uncomplicated wisdom on diffusion and the idea of mass move in binary and multicomponent structures. major tension is laid on diffusion idea 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 drinks and the formula of differential mass balances are mentioned. half II is dedicated to the calculation of absorbers and the type of absorbers. The chapters current calculation tools for the elemental different types of absorber with a close research of the calculation equipment for packed, plate and bubble columns. The authors illustrate the provided fabric with various examples, beginning with basic ones for binary structures and finishing with column calculation for multicomponent systems.
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Extra info for Absorption. Fundamentals & Applications
3-1) av is Avogadro's number, av A multicomponent solution consists of molecules that differ in shape, size, mass, electric and magnetic properties, etc. For this reason molecules of individual components have different distribution functions Φ . , and, as a result, on the basis of 1 equation (3-1), various macroscopic velocities u. are obtained. The result of the macroscopic motion of the components is the flow of the entire solution at some macroscopic velocity ω . There are three basic methods for the determination of the macroscopic velocities of the fluid.
Volumetric fractions defined by equation (3-5) are ^ therefore transformed into mole fractions and velocities u and u become identical. Similarly, when the density ρ of a liquid solution depends slightly on the composition, the partial mass volumes v. are approximately equal to l/p. Hence, the equality of volume and mass fractions as well as of velocities u and u follows. 4· CONSTITUTIVE RELATIONS FOR DIFFUSION FLUX If the concentrations of compounds are not equal throughout the entire fluid volume then a spontaneous mass transfer due to molecular diffusion occurs.
6 Nitrogen, bound xlO 31. 2 23 . 8 Chlorine, C l 2 Bromine, Iodine, Br I 48. 2 71.. 7 S 25.. 7 Ethanol 62,. ,6 Br 27 .. ,0 All calculation methods discussed so far fail in the case of dense gases, that is at high pressures or low temperatures. In DIFFUSION 45 dense gases collisions of more than two molecules play an important role, and the sizes of gas molecules can be compared with their mean free path. The solution of diffusion problems in dense gases by means of a method analogous to the Enskog-Chapman method, although theoretically possible, encoiinters serious mathematical obstacles.