Gas–liquid partitioning of halogenated volatile organic compounds in aqueous cyclodextrin solutions

Ondo, Daniel; Baránková, Eva; Dohnal, Vladimı́r

doi:10.1016/j.jct.2011.03.017

Cited by 6 publications

(10 citation statements)

References 34 publications

(66 reference statements)

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“…The K value can be calculated using Equation and describes mathematically how much additive is necessary to decrease K AW.

{VOC}_{(normalaq)} + {CD}_{(normalaq)} ⇌ normalVOC ‐ {CD}_{(normalaq)}

\frac{{normalK}_{AW, 0}}{{normalK}_{normalAW}} = 1 + normalK . \frac{{normalC}_{normalCD}}{{normalC}^{normalst}}

…”

Section: Resultsmentioning

confidence: 99%

“…However, studies focusing on partitioning are limited and only focus on a limited set of target VOCs compounds. Static headspace or related methods were applied to evaluate K AW values . It was shown in our previous work that large differences between different literature data can occur.…”

Section: Introductionmentioning

confidence: 99%

“…Partitioning data of halogenated VOCs were determined using α‐CD, β‐CD and γ‐CD solutions at temperatures between 0.2 and 53 °C by Ondo et al . Uptake of halogenated VOC in water was increased by CD addition, however, this was very CD dependent . Another type of water soluble additive is surfactants.…”

Section: Introductionmentioning

confidence: 99%

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Increasing mass transfer of volatile organic compounds in air scrubbers: a fundamental study for different gas–liquid systems

Bruneel

Walgraeve

Dumortier

et al. 2018

J of Chemical Tech & Biotech

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BACKGROUND Air scrubbers are commonly used as treatment techniques for industrial waste gases containing volatile organic compounds (VOCs). Mass transfer of hydrophobic compounds to liquid can be increased using water soluble additives in the scrubbing liquid or applying water‐miscible or immiscible solvents. The design of air scrubbers requires reliable partition data, which are limited in the literature. This manuscript provides partitioning data of new scrubber liquids and subsequent research will link the partitioning data with mass transfer characteristics in a pilot‐scale scrubber. RESULTS The DynAb method was applied for the first time to a broad set of gas–liquid systems to study the partitioning behaviour of volatile organic sulphides and aldehydes. Cyclodextrins (CD) were chosen as water soluble additives. Silicone oil (SO) and isopropylmyristate (IPM) were used as water immiscible solvents, whereas dipropylene glycol methyl ether was applied as a water‐miscible solvent. The inclusion of VOCs into the CD structure is very compound specific. Binding constants were calculated to quantify the CD‐VOC affinity and the partitioning behaviour of the VOCs with oils and solvents was quantified. The air‐to‐water partition coefficient of hexanal could be reduced more than 50 times with a concentration of 72 g L‐1 α‐CD. IPM (100% v/v) could reduce the air‐to‐IPM partitioning coefficient by a factor of 120 for dimethyl disulphide. CONCLUSION The determined partition coefficients can be used for suitability evaluation for the design and modelling of air treatment systems. A broad range of evaluated gas–liquid systems provides quantitative knowledge about VOC behaviour. © 2017 Society of Chemical Industry

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“…The K value can be calculated using Equation and describes mathematically how much additive is necessary to decrease K AW.

{VOC}_{(normalaq)} + {CD}_{(normalaq)} ⇌ normalVOC ‐ {CD}_{(normalaq)}

\frac{{normalK}_{AW, 0}}{{normalK}_{normalAW}} = 1 + normalK . \frac{{normalC}_{normalCD}}{{normalC}^{normalst}}

…”

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Increasing mass transfer of volatile organic compounds in air scrubbers: a fundamental study for different gas–liquid systems

Bruneel

Walgraeve

Dumortier

et al. 2018

J of Chemical Tech & Biotech

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show abstract

“…As the inclusion complex formation decreases the concentration of free solute molecules in the solution and thus also their concentration in the vapor phase, K GL well senses this binding. Assuming 1:1 complex formation and experiments conducted under an excess of cyclodextrin, the following equation for the variation of K GL with CD concentration can be derived [9] K 0…”

Section: Dependence Of Gas-liquid Partition Coefficient On Modifier Cmentioning

confidence: 99%

“…The selected volatile organic compounds are important representatives of the fruit aroma and occur naturally as well as in artificial flavors and fragrances. Experimental methodology for the study uses headspace gas chromatography and has been developed in this laboratory recently [9]. The effects of the additives on air-water partition coefficient of the aroma substances are correlated by Setschenow equation and for cyclodextrins also analyzed in terms of a complex formation model.…”

Section: Introductionmentioning

confidence: 99%

Effect of additives on volatility of aroma compounds from dilute aqueous solutions

Baránková

Dohnal

2016

Fluid Phase Equilibria

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Increasing mass transfer of volatile organic compounds in air scrubbers: relation between partition coefficient and mass transfer coefficient in a pilot‐scale scrubber

Bruneel

Walgraeve

Demeyer³

et al. 2018

J of Chemical Tech & Biotech

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BACKGROUNDThe mass transfer of volatile organic compounds (VOCs) from waste gas streams to liquid in scrubbers is determined by the overall volumetric mass transfer coefficient (Kga), which is dependent on the air‐to‐water partition coefficient (KAW, dimensionless). The application of additives in the water phase can alter this KAW to lower values thus increasing the Kga. Previous research provided partitioning data of new scrubber liquids and this study will link the partitioning data with mass transfer characteristics in a pilot‐scale scrubber.RESULTSThe Kga was experimentally determined using a VOC pulse addition response (PAR) method in a pilot‐scale scrubber with randomised or structured packing (1.6 m height, diameter 0.1 m). VOCs were injected at the inlet of the scrubber. SIFT‐MS was used for the online measurement of the VOC concentration. An advection–absorption model was used to calculate the Kga values for a set of VOCs and different scrubber liquid properties. Scrubber liquids and VOCs were applied to evaluate the Kga values in a KAW range from 2.6 × 10‐3 to 4.0 × 10, a gas velocity between 0.34 and 1.17 m s‐1 and liquid flow of 0.4 m3 h‐1. The obtained Kga ranged from 0 to 2.27 s‐1.CONCLUSIONA relationship between the Kga, gas velocity and KAW was established. Based on this mathematical model, the economical/technical suitability of applying an additive to the scrubbing liquid of industrial installations can be evaluated. β‐cyclodextrin was applied as additive in the scrubber and Kga values were significantly higher than with pure water. © 2018 Society of Chemical Industry

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Gas–liquid partitioning of halogenated volatile organic compounds in aqueous cyclodextrin solutions

Cited by 6 publications

References 34 publications

Increasing mass transfer of volatile organic compounds in air scrubbers: a fundamental study for different gas–liquid systems

Increasing mass transfer of volatile organic compounds in air scrubbers: a fundamental study for different gas–liquid systems

Effect of additives on volatility of aroma compounds from dilute aqueous solutions

Increasing mass transfer of volatile organic compounds in air scrubbers: relation between partition coefficient and mass transfer coefficient in a pilot‐scale scrubber

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