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This paper demonstrates that the two excess Gibbs free energy G E models with temperature-dependent parameters in the modified Huron—Vidal first-order (MHV1) mixing rule allow the Peng—Robinson equation of state modified by Stryjek and Vera (PRSV) to be used for calculation of vapor—liquid equilibria over wide ranges of temperature and pressure. Good results are obtained for strongly non-ideal...
The sieve plate electrochemical reactor is a unit for enabling electrochemical reaction of gaseous species in the liquid phase. The reaction can occur either directly at the surface of the electrodes or indirectly with electrochemical mediators generated in situ. A sieve plate absorber is used for the gas-to-liquid mass transfer and, on appropriate stages, stacks of electrodes are supported on the...
A general recycle compensator, applicable to multivariable plants, is derived. For the single-variable case, the internal model control method is used to design robust controllers for the compensated plant leading to an overall better system than for the case of the uncompensated plant while, for the multivariable case, diagonal proportional plus integral controllers ensuring performance robustness...
Protein refolding is a key operation in many bioprocesses utilizing Escherichia coli. Most laboratory studies into refolding are conducted in batch systems at “infinite” dilution to avoid the formation of aggregates. This policy will be grossly suboptimal if adopted for scale-up. The impact of refolding policy on dimensionless annual operating cost for a simplified kinetic scheme is therefore investigated...
l-carnitine is a fine chemical with pharmaceutical, nutritional and animal food applications. Thus, the product purification forms an essential part of the production process. Consequently, process optimization of biotransformation and downstream processing should be done in an integral way. There are several options for the process design of the biotransformation, e.g. chemostat with cell recycling,...
The inversion of sucrose solution was studied in a packed bed of strongly acidic cation exchange resins in order to determine the values of the reaction rate constant, effective diffusivity and distribution coefficients for 20, 30 and 40 wt.% solution concentration. Typical values of specific rate constant for 30 wt.% sucrose solution varied from 0.0115 to 0.7391 min −1 in the temperature...
Ash (S.N. Ash, P. Ray and B.V. Detta, AIChE J., 31 (1985) 821; S.N. Ash, Chem. Eng. J., 48 (1992) 183) has proposed a correlation for calculating the binary parameters of the Wilson g E model by using only pure-component parameters: solubility parameters, molar liquid volumes, relative van der Waals volumes and surfaces, critical properties, acentric factors and dipole moments. To evaluate...
A moving window neural network was applied for dynamic modelling and on-line estimation of consumed sugar, cell mass, and product concentration in l-lysine fed-batch culture. The organisms were auxotrophic mutants for l-homoserine and were resistant to S-(2-aminoethyl)-l-cysteine. The reducing sugar concentration was calculated on line by using the estimated consumed sugar concentration and was maintained...
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