By Erdogan Alper
ISBN-10: 902472872X
ISBN-13: 9789024728725
Read or Download Mass transfer with chemical reaction in multiphase systems (NATO ASI series) Volume I: Two-Phase Systems PDF
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Additional info for Mass transfer with chemical reaction in multiphase systems (NATO ASI series) Volume I: Two-Phase Systems
Example text
If the diffusivities of all species are equal), the rate of mass transfer will be governed by a driving force measured in terms of the total concentration of the transferring component, rather than in terms of the concen tration of its physically dissolved form : 21 N = kO (a* L i - a ) (7) 0 The quantity a is the value of a in the bulk of the liquid. 7 represents an upper bound for the rate of mass transfer. , the value of 1 when ~700) is calculated from Eq's 3 and 7 : a. 100= Cl. 0 1- a. 8 can be very large indeed, and are typically of the order 10 2 to 10 4 .
From such a model; the enhancement factor I can be calculated as a function of t~mp~rature and composition of bcth gas and liquid phases. This function should form the basis for design procedures. When a set of rate data is obtained, the ~first step in the analysis is to ascertain which regime of mass transfer applies to the d~ta. The quantity which is measured is the total mass transfer rate V; the chemical mass transfer coeificient kL can be extracted from the data provided the driving force and the interface area are known.
In this case selective removal of H2S may be utilized in two modes: either as a first step"of the basic gas process, yielding a high-H2S content stripp~d gas to be fed to the Claus plant, and followed by a C02-removal step; or alternately, a conventional process stripping both gases simultaneously followed by selective removal of H2S from the acid gas stream. 47 Se~ectivity for H2S has been demonstrated experimentally and explained theoretically , since the late sixties for some special chemical solvents which are not in common industrial use.
Mass transfer with chemical reaction in multiphase systems (NATO ASI series) Volume I: Two-Phase Systems by Erdogan Alper
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