The effect of selected solvents on the relative volatility of the binary system: 1–octene �?2–hexanone with the aim of separating the azeotropic mixture

[摘要] The removal of oxygenates from olefins has tremendous industrialsignificance. This study dealt specifically with potentialazeotropic and extractive distillation processes for thepurification of higher alpha olefins.An Othmer type vapour liquid equilibrium still was used to studythe influence of selected solvents on the l-octene I 2-hexanonesystem. These screening tests were performed under conditions ofa fixed solvent concentration of 66% with the azeotropic ratioof l-octene to 2-hexanone.The resulting data was used to identify solvent properties andtheoretical models which correlate well with actual performance.It is evident that specific available solvent properties andprinciples can indeed be successfully utilized to predict theeffect of a solvent. Although many of these guidelines are notstrictly quantitative, they agree well with theoreticalunderstandings of sol vent action and can save much time in futuresolvent searches.The large difference in polarity between the two components.appears to be the main factor on which the sol vents discriminate.Differences in molar volume and complex forming ability are alsomeaningful. Related sol vent properties are consequently importantwhen selecting a solvent for similar systems. Effective solvents(such as dimethyl formamide and methanol) all have high valuesfor properties {such as the dielectric constant and polarsolubility parameter) which are associated with the strength ofsolvent solute interaction.Binary vapour liquid equilibrium data was also measured for somesol vents. The data was regressed and used to simulate actualdistillation schemes. This verified that chosen solvents areindeed able to efficiently effect a high separation between thetwo components.

[发布机构] North-West University