Transient characteristics of continuous extraction with agitation

Staffin, H. K.; Chu, Ju Chin

doi:10.1002/aic.690100129

Cited by 9 publications

(3 citation statements)

References 11 publications

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“…where FRRl and FRRz are the fractions of the total sample weights, WTMI and WTM2, in the raffinate phase of the original unequilibrated profile samples, and EC and RC refer to the column concentrations. ( 6 ) From the solubility curve relations, EA and RA can be evaluated if EC and RC are known. Therefore, Equations (3) to and from ( 6 ) :…”

Section: Transient Profile Methodsmentioning

confidence: 99%

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The dynamics of extraction processes: Part III. The determination of steady state and transient concentration profiles

Pollock

Johnson

1970

Can J Chem Eng

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Techniques for determining concentration profiles during the transient and final steady state operation of a eountercurrent extraction column are described and evaluated. The column is mechanically agitated and the stages are separated using Teflon sieve trays. The paper discusses numerical procedures for analyzing the behaviour of such columns, and the errors introduced by the measurement techniques studied. Mass transfer coefficients for the column under study are reported, and there is a discussion of the effect of concentration (or position along the column) on their value.

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Section: Transient Profile Methodsmentioning

confidence: 99%

“…Similarly for component A ( 6 ) From the solubility curve relations, EA and RA can be evaluated if EC and RC are known. Therefore, Equations (3) to These four equations can be solved by direct iteration in the following manner:…”

Section: Mc1mentioning

confidence: 99%

The dynamics of extraction processes: Part III. The determination of steady state and transient concentration profiles

Pollock

Johnson

1970

Can J Chem Eng

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“…Different investigators have suggested different types of sampler which were reviewed by Bonnet (1982). The continuous phase sampling technique used in this investigation was basically similar to that developed by Bonnet (1982) and by Staffin (1959), in which the sampling probe behaves as a drop filter. It was constructed of stainless steel, which was wetted by the continuous phase, with several layers of stainless steel micro mesh cloth positioned inside it.…”

Section: Sampling and Analysis Techniquementioning

confidence: 99%

Mathematical modeling and steady‐state analysis of a scheibel extraction column

et al. 1995

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The steady-state behavior of a nine-stage Scheibel extraction column was modeled and simulated using a back flow stagewise model. Steady-state experiments were conducted, using the system water-acetone-toluene, for three phase ratios and three agitator speeds. The mathematical model was validated with the experimental concentration profiles by a single parameter fitting technique with an unconstrained optimization algorithm.Steady-stage analysis of the experiments was performed for a further control study. The calculated steady-state gain matrices were used for interaction analysis using different steady-state analysis methods, e.g. Bristol numbers, Condition numbers, Morari Indexes of Integral Controllability, and Niederlinski Indexes. The results indicate that both agitator speed and phase ratio have a substantial influence on the control structure. Dynamic analysis should therefore be performed to verify the optimum control method for this process.On a simult le comportement en rtgime permanent d'une colonne d'extraction Scheibel de 9 ktages, en utilisant un modkle ?i reflux. Des expkriences en rtgime permanent ont Ctt men&s, avec le syst&me eau-ac6tone-tolukne, pour trois rapports de phase et trois vitesses d'agitateur. Le modtle mathtmatique a 6t6 valid6 avec les profils de concentration expkrimentaux par une technique de calage ?i un seul paramttre bask sur un algorithme d'optimisation non contraint.On a analyst les expkriences en rtgime permanent en vue d'une ttude de rtgulation plus poussk. Les matrices de gain en rdgime permanent calculks ont tt6 utilishs pour I'analyse des interactions au moyen de diffkrentes mtthodes d'analyse en rtgime permanent, tels les nombres de Bristol, les nombres de condition, les indices de contrdlabilitt inttgrale de Morari et les indices de Niederlinski. Les rtsultats indiquent que la vitesse de l'agitateur et le rapport de phase exercent une influence considtrable sur la structure du contrdle. Une analyse dynamique devrait donc &re men& pour verifier la mtthode de regulation optimale pour ce prockdt.

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The dynamics of extraction processes: Part I. Introduction and critical review of previous work

Pollock

Johnson

1969

Can J Chem Eng

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A critical review and comparison of published work in the field of extraction dynamics is made. These studies of the transient behavior of liquid‐liquid extraction processes are summarized and evaluated. From these evaluations it is concluded that much work remains to be done for systems other than those involving simple extraction columns with terminal feeds and products, and also that pulse testing and frequency response analysis have become important tools for the determination of extraction dynamics. It was also concluded that staged models as opposed to differential contact models offer the most hope for realistic control and simulation studies.

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Transient characteristics of continuous extraction with agitation

Cited by 9 publications

References 11 publications

The dynamics of extraction processes: Part III. The determination of steady state and transient concentration profiles

The dynamics of extraction processes: Part III. The determination of steady state and transient concentration profiles

Mathematical modeling and steady‐state analysis of a scheibel extraction column

The dynamics of extraction processes: Part I. Introduction and critical review of previous work

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