New PDF release: Adsorption-Dryers for Divided Solids

By Jean-Paul Duroudier

ISBN-10: 008101774X

ISBN-13: 9780081017746

ISBN-10: 1785481797

ISBN-13: 9781785481796

Adsorption-Dryers for Divided Solids, a part of the business gear for Chemical Engineering set, offers useful functions and exact wisdom on worldwide learn, offering an in-depth examine of quite a few facets in the box of chemical engineering.

This quantity discusses the main of adsorption of gaseous impurities, functional information on adsorption, ion alternate and chromatography, the speculation of drying, and the speculation of imbibition. the writer additionally presents equipment wanted for realizing the gear utilized in utilized thermodynamics within the wish of encouraging scholars and engineers to construct their very own courses. Chapters are complemented with appendices which offer additional info and linked references.

  • Provides key features of fluid-solid equilibriums
  • Includes a realistic use of adsorbents that may be utilized
  • Covers specific situations in chromatography
  • Presents basic tools for calculations on dryers

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Additional info for Adsorption-Dryers for Divided Solids

Sample text

4. Initial conditions and boundary conditions 1) Fluid At the input to the column (x = 0) ∂c = Pef ( c0 − c F ) ∂x x =0 cF: concentration of the feed; c0: concentration at the input. At the output from the column: ∂c =0 ∂x x =1 The initial condition is expressed by the concentration profile of the fluid along the column c = c ( 0, x ) τ=0 Adsorption and Ion-exchange Chromatography 37 2) Particles At the center of a spherical particle, symmetry dictates that: ∂cs =0 ∂ρ ρ=0 At the surface of the particle, the exchange equation is expressed by: ∂cs = Bi ( c * −c ) ∂ρ ρ = 1 ρ=1 The initial concentration in the particles is supposed to be uniform in each particle, but that concentration in each particle depends on the abscissa x and on the initial concentration of the fluid.

We know that: t R = (1 + k ') t 0 = (1 + k ') L u Hence we have the value of k’ (the capacity parameter). 2. s-1; t0: residence time of the fluid: s. 2. : dq = const. = a dc then the capacity parameter is the ratio: k '0 = mass of solute in the solid mass of solute in the fluid We often see the situation approach linear chromatography if the concentration of the sample introduced into the column is near to zero. In this case, k’ takes the value k '0 : dq #const. s-1. The residence time t0 is all the greater when the adsorption of the solute practically does not vary the fluid volume and thus the velocity u.

However, this analogy is misleading if we are looking at a chromatography column. Indeed, for a feed in the form of a Dirac pulse, we know that the concentration profile of the liquid at the output is a bell curve whose standard deviation σ is given by the following relation, which is the definition of the TPEH. σ2 = HZ σ2: variance of the concentration: m2; Z: height of the column: m; H: HETP (Height Equivalent to a Theoretical Plate): m. The existence of this type of concentration profile is due to the conjunction of three random phenomena which can each be characterized by a variance.

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Adsorption-Dryers for Divided Solids by Jean-Paul Duroudier


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