Solubility of organics in water and silicon oil: A comparative study

Research output: Contribution to journalArticle

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Abstract

The aim of this study was to compare the solubility of selected volatile organic compounds in water and silicon oil using the simple static headspace method. The experimental design allowed equilibrium achievement within 30 - 60 minutes. Infinite dilution activity coefficients and Henry's law constants for various organics representing esters, ketones, alkanes, aromatics, cycloalkanes and amines were measured at 303K. The measurements were reproducible with a relative standard deviation and coefficient of variation of 1.3×10 -3 and 1.3 respectively. The static determined activity coefficients using shaker flasks were reasonably comparable to those obtained using the gas liquid - chromatographic technique and those predicted using the group contribution methods mainly the UNIFAC. Silicon oil chemically known as polydimethysiloxane was found to be better absorbent for VOCs than water which quickly becomes saturated. For example the infinite dilution mole fraction based activity coefficients of hexane is 0.503 and 277 000 in silicon oil and water respectively. Thus silicon oil gives a superior factor of 550 696. Henry's law constants and activity coefficients at infinite dilution play a significant role in the design of scrubbers for abatement of volatile organic compounds from contaminated air streams. This paper presents the phase equilibrium of volatile organic compounds in very dilute aqueous and polymeric solutions indicating the movement and fate of chemical in air and solvent. The successful comparison of the results obtained here and those obtained using other methods by the same authors and in literature, means that the results obtained here are reliable.

Original languageEnglish
Pages (from-to)208-211
Number of pages4
JournalWorld Academy of Science, Engineering and Technology
Volume79
Publication statusPublished - Jul 2011

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Activity coefficients
Volatile organic compounds
Solubility
Dilution
Silicon
Water
Scrubbers
Air
Hexane
Ketones
Phase equilibria
Design of experiments
Paraffins
Amines
Esters
Oils
Liquids
Gases

All Science Journal Classification (ASJC) codes

  • Engineering(all)

Cite this

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Solubility of organics in water and silicon oil : A comparative study. / Muzenda, Edison.

In: World Academy of Science, Engineering and Technology, Vol. 79, 07.2011, p. 208-211.

Research output: Contribution to journalArticle

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