Separation Processes

King, C. Judson; Lannus, Arvo

doi:10.1149/1.2404285

Cited by 44 publications

(53 citation statements)

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“…If we use K 0 S/W ~ 1.4 as a criterion for effective removal (King, 1980), a solvent-to-water mass flow ratio, S/W, ~ 0.39 would be required for removal of trihydric phenols with MIBK at low pH, while S/W ~ 0.14 would suffice for dihydric phenols. For DIPE, on the other hand, S/W ~ 1.4 would be required to remove dihydric phenols effectively, and S/W ~ 8 or more would be required for trihydric phenols.…”

Section: Effect Of Phmentioning

confidence: 99%

Solvent extraction of phenols from water

Greminger¹

1982

Ind. Eng. Chem. Proc. Des. Dev.

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118

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Methyl isobutyl ketone (MIBK) and diisopropyl ether (DIPE) have been evaluated as solvents for extraction of phenols, at high dilution, from water. Equilibrium distribution coefficients (KD) have been measured for phenol, dihydroxybenzenes and trihydroxybenzenes in both solvents as a function of pH. Particularly for the multihydric phenols, MIBK gives substantially higher values of KD than does DIPE. The effect of pH can be described quantitatively through a simple ionization model, using published values of dissociation constants for the various phenols.Some method for removal of residual dissolved solvent must ordinarily be included in any extraction process for phenols. Possibilities include atmospheric-steam or inert-gas stripping, vacuum-steam stripping, and extraction with a second solvent. Vacuum-steam stripping is a particularly attractive choice for removal of MIBK; this reinforces the utility of MIBK as a solvent. The optimal temperature for vacuum stripping is generally the temperature of the extraction operation, which in turn is related to the effect of temperature on KD. Values of KD for phenolwater-MIBK were determined at 30°, 50°, and 75°C, and were found to decrease with increasing temperature at all concentrations.

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Section: Effect Of Phmentioning

confidence: 99%

Solvent extraction of phenols from water

Greminger¹

1982

Ind. Eng. Chem. Proc. Des. Dev.

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118

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“…The Underwood roots, θ A and θ B are found from the feed equation (King, 1980). The break in the prefractionator curve in Fig.…”

Section: Energy Savings For Integrated Prefractionator Arrangementsmentioning

confidence: 99%

“…(1). The vapour flowrate in the second column is calculated from Kings equation (King, 1980) for binary mixtures. Note that the effect of pressure on the separation is not included in these formulas.…”

Section: Energy Savings For Integrated Prefractionator Arrangementsmentioning

confidence: 99%

Selecting appropriate control variables for a heat-integrated distillation system with prefractionator

Engelien

Skogestad

2004

Computers & Chemical Engineering

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A heat-integrated prefractionator arrangement is studied for a ternary separation of a propane-butane-pentane mixture. These types of integrated prefractionator arrangements have large energy savings compared with the best of the direct or indirect sequence with no heat integration. However, a heat-integrated distillation system can be more difficult to control than a non-integrated arrangement, so good control systems are essential. In this work, the focus is on selecting control variables that will ensure that the promised energy savings are achieved. The method of self-optimizing control (Skogestad, 2000) has been used to provide a systematic procedure for the selection of controlled variables, based on steady state economics. The results show that the integrated prefractionator arrangement can have large energy savings compared with non-integrated arrangements and that controlling the ratio of the distillate flow to the feed flow has good self-optimizing properties.

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“…In view of increasing energy costs, it is important to design distillation systems which consume less energy. Several authors have described intuitive schemes minimizing energy consumption in multicomponent distillation processes, for example, King [1], Petlyuk et al [2], Stupin and Lockhart [3]. In a recent paper, Rathore et al [4] described a strategy for synthesizing optimal separation systems with energy integration.…”

Section: Introductionmentioning

confidence: 99%

Fuzzy Analogical Gates Approach for Heat Integrated Distillation Systems

Hussein¹,

Gawad²

2016

IJCA

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In this paper a new systematic method for optimal synthesis of heat integrated distillation column has been developed, the proposed method which is fuzzy analogical gates consists of three sequential steps to select the best separation sequence: estimation of the normalized variables parameters, Fuzzy analogical gates and selection of the best split, Two analogical gates (symmetric and asymmetric) are employed. The symmetric gate (AND gate) inputs are the normalized heat load, normalized column temperature difference. The asymmetric gate (Invoke gate) inputs are the output of the AND gate and the normalized (Q.∆T). The method has been tested for three problems reported in the literature which have been solved previously using other approaches.

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Separation Processes

Abstract: not Available.

Cited by 44 publications

References 0 publications

Solvent extraction of phenols from water

Solvent extraction of phenols from water

Selecting appropriate control variables for a heat-integrated distillation system with prefractionator

Fuzzy Analogical Gates Approach for Heat Integrated Distillation Systems

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