Comparison of static with gas-chromatographic solute infinite-dilution activity coefficients with poly(dimethylsiloxane) solvent

Ashworth, Anthony J.; Chien, C. F.; Furio, D. L.; Hooker, David M.; Kopečni, M. M.; Laub, R. J.; Price, Gareth J.

doi:10.1021/ma00135a020

Cited by 47 publications

(20 citation statements)

References 2 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The γ i ∞ for n-pentane, n-hexane, n-heptane, cyclohexane, toluene and chloroform measured at 303.15 K in this work are in agreement with those of Summers at al. [9] and Ashworth et al [10]. The close agreement means that our results for the rest of the compounds studied here are con-…”

Section: Infinite Dilution Activity Coefficientssupporting

confidence: 88%

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

Muzenda

Belaid

Ntuli

2010

Korean J. Chem. Eng.

View full text Add to dashboard Cite

Silicon oil, chemically known as polydimethylsiloxane (PDMS), is a high boiling point solvent highly suitable for volatile organic compounds (VOCs) absorption. To use PDMS as an absorption solvent for a specific waste gas problem, it is important to determine the infinite dilution activity coefficients of the VOCs to be separated with PDMS. This work reports activity coefficients at infinite dilution of 13 VOCs in polydimethysiloxane determined by the dynamic gas liquid chromatographic technique. The measurements were carried out at various temperatures (303.15, 313.15, 323.15., 333.15, 353.15, 373.15, 393.15 and 423.15 K). Four PDMS polymers with average molecular weight ranging from 760 to 13,000 were used as solvents. A control column packed by Perkin Elmer to our specifications was used to validate the coating and packing methods. Flow rate dependence of the elution peaks was also investigated by varying it from 10-50 ml/min. Precision was improved by reproducing the results using columns with different liquid loading, thus also studying the retention mechanism. The results compare well with the data from previous work using simple headspace and UNIFAC predictions and literature values. 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.

show abstract

Section: Infinite Dilution Activity Coefficientssupporting

confidence: 88%

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

Muzenda

Belaid

Ntuli

2010

Korean J. Chem. Eng.

View full text Add to dashboard Cite

show abstract

“…We have also shown elsewhere, by comparison of static with gas-chromatographic activity coefficients [2], that the data are accurate to+ 1 Yo. As a result, and in addition to their utility both in analytical and physicochernical applications of GLC, they can be employed with confidence to calculate from probe-solute capacity factors the volume of stationary liquid present in opentubular columns (be this coated, polymerized in situ, or chemically bonded) [3].…”

supporting

confidence: 58%

Specific retention volumes and retention indices of selected hydrocarbon solutes with OV‐101 and SP‐2100 polydimethylsiloxane solvents

Chien

Furio

Kopečni

et al. 1983

J. High Resol. Chromatogr.

Self Cite

View full text Add to dashboard Cite

As part of our work in defining a standard set of stationary phases for gas chromatography, we reported the specific retention volumes and retention indices I of upwards of thirty hydrocarbon solutes with OV-1 and SE-30 polydimethylsiloxane solvents at 30° to 8OoC [l]. Only minor differences in absolute retentions were found between the two, while there were virtually no differences in relative retentions. However, we have pointed out elsewhere [2,3] that retentions with these gums may in fact be slightly different from those with the less viscous phases OV-101 and SP-2100. The mechanism of retention in the former case appears in fact to amount in part to swelling of the polymer surface, while that with the latter phases evidently corresponds to homogeneous solution. As a result, 4 increases slightly on passing from OV-101 to OV-1 for solutes which solvate the polymer well, while a slight decrease is found for solutes which solubilize the gum only poorly.In order to provide a basis for assessment of these effects, we report here the retentions, Table 1, and the retention indices, As before, we of course invite and encourage comparison of these results with those of others and in addition, offer the data as standards of precise and accurate absolute retentions and retention indices for the systems listed.

show abstract

“…Separations are due to different times solutes spend in the stationary phase. The adjusted retention volume is given by (6).…”

Section: Calculationsmentioning

confidence: 99%

“…Experimental temperature and flow rate were varied from 298 -343K and 70 to 120ml/min respectively. Reference [6] reported replicate gas -liquid chromatographic based specific retention volumes, activity coefficients and interaction parameters of ten solutes with polydimethylsiloxane at 303K.…”

Section: Introductionmentioning

confidence: 99%

Temperature Effect on Volatile Organic Compounds –Polydimethylsiloxane Interactions

Muzenda¹,

Ntuli²

2011

IJCEA

View full text Add to dashboard Cite

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.

show abstract

Comparison of static with gas-chromatographic solute infinite-dilution activity coefficients with poly(dimethylsiloxane) solvent

Cited by 47 publications

References 2 publications

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

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

Specific retention volumes and retention indices of selected hydrocarbon solutes with OV‐101 and SP‐2100 polydimethylsiloxane solvents

Temperature Effect on Volatile Organic Compounds –Polydimethylsiloxane Interactions

Contact Info

Product

Resources

About