Measurement of infinite dilution activity coefficients of selected environmentally important volatile organic compounds in polydimethylsiloxane using gas - liquid chromatography

Muzenda, Edison; Belaid, Mohamed; Ntuli, Freeman

doi:10.1007/s11814-010-0262-z

Cited by 2 publications

(5 citation statements)

References 5 publications

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“…The choice of the optimum temperature for the absorption process requires knowledge of temperature dependence of the activity coefficient. The derived Infinite dilution activity coefficients [2], [9] - [11] calculated from the specific retention volumes reported in this study show that the higher the temperature the higher the activity coefficients. This tendency is very favorable for desorption, because higher values at higher temperature would ease regeneration.…”

Section: A Variation Of Specific Retention Volumes From Literature Fmentioning

confidence: 83%

“…The materials used have been described previously [1], [2], [9] - [11]. The thirteen solutes used in this work were coded numerically as in TABLE II for simplicity.…”

Section: Methodsmentioning

confidence: 99%

“…The successful comparison gives an indication of the GLC as a rapid, simple and accurate method for studying the thermodynamics of the interaction of a volatile solute with a nonvolatile solvent. (11) where φ is the phase volume ratio and R is the gas constant.…”

Section: A Variation Of Specific Retention Volumes From Literature Fmentioning

confidence: 99%

“…The GLC is suitable for measuring specific retention volumes because of the small vapour pressure of PDMS. The procedure of the measurement in particular, the effect of flow rate of carrier gas, effect of sample size, and liquid loading were previously investigated [1,2].…”

Section: Introductionmentioning

confidence: 99%

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Temperature Effect on Volatile Organic Compounds –Polydimethylsiloxane Interactions

Muzenda¹,

Ntuli²

2011

IJCEA

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Temperature dependence of specific retention volumes (o g V) of 13 volatile organic compounds (VOCs) of environmental importance between the gas and liquid stationary phase (polydimethysiloxane) (PDMS) were studied using the gas liquid chromatographic technique (GLC). Temperature was varied from 303.15K to 423.15K to allow transport calculations for different seasons. Four PDMS polymers with average molecular weight ranging from 760 to 13 000 were used as solvents. The results of this work confirm that PDMS is well suited for VOCs scrubbing from waste gas streams. Linear plots of log g V against T 1 were obtained in all cases permitting predictions and interpolations to temperatures not studied here. Also dependable enthalpies and entropies of solute transfer from the mobile phase to the stationary phase can be calculated. The specific retention volumes reported in this work are in agreement with literature for similar systems. Efforts were taken to ensure the best possible accuracy and trace the possible sources of error. A gas liquid chromatographic system which secured a simple retention mechanism and showed reproducible solute retention over a long period of time was devised.

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Section: A Variation Of Specific Retention Volumes From Literature Fmentioning

confidence: 83%

“…The materials used have been described previously [1], [2], [9] - [11]. The thirteen solutes used in this work were coded numerically as in TABLE II for simplicity.…”

Section: Methodsmentioning

confidence: 99%

Section: A Variation Of Specific Retention Volumes From Literature Fmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Temperature Effect on Volatile Organic Compounds –Polydimethylsiloxane Interactions

Muzenda¹,

Ntuli²

2011

IJCEA

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“…Recent phase equilibrium measurements using gas -liquid chromatographic techniques for polymeric systems have been discussed [3], [4], [11].…”

Section: Introductionmentioning

confidence: 99%

Solubility of Organics in Triethylene Glycol: Phase Equilibrium Modelling Using the Dortmund and LYNGBY Modified UNIFAC Models

Muzenda¹,

Belaid²,

Mateescu³

2015

JOCET

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Abstract-This work is an attempt to predict the solubility of 60 volatile organic compounds (VOCs) in triethylene glycol aimed at thermodynamically testing the suitability of this solvent as an absorbent for the selected organics. The VOC main groups studied were alkanes, alkenes, alkynes, aldehydes, carboxylic acids and alcohols. The Modified UNIFAC Dortmund and Lyngby models were to study the required phase equilibrium as a function of temperature and composition. Triethylene glycol was found to be suitable for the absorption of low molecular weight aldehydes, alcohols and carboxylic acids. Generally, the infinite dilution activity coefficients computed in this study were low (below 100) indicating that the polymeric solvent studied in this work gave favourable phase equilibrium compared to water, the common industrial solvent. The solubility of VOCs was also found to decrease with increase in solute molecular weight. Compared with literature findings, the Dortmund performed better than the Lyngby procedure. However both models failed to accurately predict phase equilibrium behaviour. The authors therefore agree with literature findings that a specialised group interaction needs to be created for this solvent in the UNIFAC models in order to satisfactorily predict activity coefficients for the studied binary interactions.Index Terms-Absorbent, phase equilibria, solubility, volatile organic compounds.

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Measurement of infinite dilution activity coefficients of selected environmentally important volatile organic compounds in polydimethylsiloxane using gas - liquid chromatography

Cited by 2 publications

References 5 publications

Temperature Effect on Volatile Organic Compounds –Polydimethylsiloxane Interactions

Temperature Effect on Volatile Organic Compounds –Polydimethylsiloxane Interactions

Solubility of Organics in Triethylene Glycol: Phase Equilibrium Modelling Using the Dortmund and LYNGBY Modified UNIFAC Models

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