Phase equilibria properties of binary and ternary systems containing di-isopropyl ether + isobutanol + benzene at 313.15 K
Introduction
Ethers and alcohols have been traditionally used as blending agents in the formulation of new gasolines for enhancing the octane number. To better understand and model these unleaded gasolines we started many years ago a research program on the thermodynamic characterization of ternary mixtures, as the simplest multicomponent system, containing oxygenated additives (ethers and alcohols) and different type of hydrocarbons (paraffins, cycloparaffins, aromatics, oleffins). Methyl tert-butyl ether (MTBE), tert-amylmethyl ether (TAME) and di-isopropyl ether (DIPE) were chosen as representative ethers; methanol, isopropanol, 1-propanol and tert-amyl alcohol as alcohol additives.
Now, we continued studying ternary mixtures containing DIPE, benzene and different butanol isomers. Here, we report vapour–liquid equilibrium data concerning the ternary mixture DIPE + isobutanol + benzene at 313.15 K. The experimental technique used is a static type of high accuracy.
These highest quality of vapour–liquid equilibrium data are required to improve the interaction parameters of the predictive models which are used in process simulation packages. The accuracy of a process simulation depends strongly on the thermodynamic models used to describe the physical behaviour of the involved components. This purpose could be carried out with these measurements.
Section snippets
Experimental
Di-isopropyl ether and benzene used were purchased from Fluka Chemie AG and were of the highest purity available, chromatography quality reagents (of the series puriss. p.a.) with a purity >0.99 and >0.995 (GC), respectively. Isobutanol used was anhydrous Aldrich product with a purity >0.999 (GC). All liquids degassed prior to measurements using a modified distillation method based on the technique of Van Ness and Abbott [1], under vacuum. The purities of the chemicals were checked by gas
Results and discussion
In this work, experimental isothermal p–x–y data for the ternary system di-isopropyl ether (DIPE) + isobutanol + benzene and two of the binary systems involved DIPE + isobutanol and benzene + isobutanol at 313.15 K are reported. The other binary system has been measured and published before [4].
Data reduction for the binary and ternary mixtures was done by Barker's method according to well established procedures [5], [6]. The non-ideality of the vapour phase was taken into account with the virial
Acknowledgement
Support for this work came from the Spanish Ministry of Science and Technology, project PPQ2002-04414-C02-02.
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