Counter-Current Extraction. An Introduction to the Design by Stanley Hartland

By Stanley Hartland

Counter-Current Extraction: An creation to the layout and Operation of Counter-Current Extractors offer priceless conclusions and effects bearing on counter-current extraction. This ebook goals to offer illustrations of many of the mathematical thoughts as instruments in addition to capability to an finish.
Organized into 8 chapters, this ebook starts with an outline of a number of the elements of the move of a unmarried solute among immiscible levels in counter-current circulate. this article then describes all attainable elements and obtains their courting to the extraction issue and variety of levels or move devices. different chapters reflect on the flows and concentrations in counter-current ahead and again extraction. This publication discusses in addition the optimization of ahead and again extraction utilizing counter-current circulate in differential and stagewise extractors. the ultimate bankruptcy offers with extra functions of counter-current extractions.
Undergraduates and researchers considering the layout and operation of counter-current extractors will locate this ebook worthy.

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Additional info for Counter-Current Extraction. An Introduction to the Design and Operation of Counter-Current Extractors

Example text

26 COUNTER-CURRENT EXTRACTION solute balance round a typical stage η leads to (1 + J)yn — Jyn-t where j ( x i n) Alc(l) / = mG\L j(*in) = and = m + *\n c is the y concentration in equilibrium with the cross-current solvent feed. This finite difference equation has solution yn = ^ λ η + @ where Alc(2) / A — 1 + / and stf and £8 are constants which may be determined from the boundary conditions. These are η = 0 when y n = y i a Alc(3) and η = Nc when yn = y0Xlt Alc(4) η= 1 y „ = y i a -f j ( x l n ) Ale(5) when which may be obtained from a balance around the first stage.

13. , pp. 14-60, McGraw-Hill Book Company Incorporated, New York, 1963. T. K . SHERWOOD and R . L. PIGFORD, Absorption and Extraction, p. 135, McGrawHill Book Company Incorporated, New York, 1952. , p. 555, McGrawHill Book Company Incorporated, New York, 1950. VERMEULEN, Longitudinal dispersion in two-phase continuous flow operations, Ind. Eng. Chem. (Fundamentals) 2 (2), 113 (1963). W . M . K A Y S and A . L . , McGrawHill Book Company Incorporated, New York, 1964. TREYBAL, Mass Transfer Operations, p.

Variation of ß 3 J4 (or ß 4 ; 3 ) with / (or / * ) for different values of Ns. region / less than one is shown; when / is greater than one, its inverse l/J and the inverse separation factor g 4 / 3 should be used. Plots of Ν versus In Q at constant values of / are also linear. The formulae involving ö 3 / 4 does have the disadvantage that Ν is indeterminate when J = 1. This is because Q3/4 is always one when / = 1, and is not affected by the length of the operating line. However, this disadvantage also applies to log mean concentration and temperature FORMULAE R E L A T I N G Ν, / A N D Q 37 differences which are widely used.

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