A new approach to evaluate kinetic parameters and mass transfer coefficients in continuous stirred tank reactors. Application to antibiotic separation
✍ Scribed by Sunil Nath; Vivek Shukla
- Publisher
- Elsevier Science
- Year
- 1997
- Tongue
- English
- Weight
- 544 KB
- Volume
- 65
- Category
- Article
- ISSN
- 0923-0467
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✦ Synopsis
A new method is proposed to evaluate kinetic parameters and mass transfer coefficients for adsorption processes camed out m continuous stirred tank reactors. This method, employing a biphasic model, does not hnearize nonlinear solute concentration versus time data, nor does It assume the existence of equihbrmm in a typ~cai nonequilibrium situation as is currently done. For a nonhnear adsorption isotherm, the coupled differential equations need to be solved numerically, but using an elegant analytical solution it is possable to determine rate constants and mass transfer coefficients in the case of nonhnear kinetics with a linear adsorptmn isotherm. This solution (biphaslc model, linear isotherm) is obtained and compared with solutions incorporating (i) a hnear model (linear isotherm) and (i1) a numerical solution (nonlinear isotherm) for recovery of the antibiotic novobaocln m stirred tank reactors. For novobiocm adsorptmn versus time data, use of the blphasic model results in a lower mean percentage error than either the linear model or the numerical simulation, further, it prowdes a far superior fit of short-time adsorption behavior. Hence, we strongly advocate that the biphasic model be routinely employed along with linear models and numencai simulations of Langmulr/Freundhch Isotherms for interpretation of adsorption data Keywords.