Measurement and correlation of isobaric vapour-liquid equilibria for binary systems of 1-(methoxymethoxy)-2-methyl-propane with 1-butanol and isobutanol at 101.33 kPa
Introduction
1-(Methoxymethoxy)-2-methyl-propane is a type of oxygenated compound which can be synthesized from formaldehyde, isobutanol and methanol. The compound serves as a diesel oil additive, can reduce soot formation and increase the combustion efficiency during combustion [1], [2], [3]. However, before developing the separation technology of 1-(methoxymethoxy)-2-methyl-propane, these vapour-liquid equilibra (VLE) and the azeotropic state with alcohols (as the raw material) mixture remain unclarified. The data of VLE and the azeotropic state are always required for engineering use such as in design of distillation process. Here, we measured the isobaric VLE measurements about binary mixtures composed of 1-(methoxymethoxy)-2-methyl-propane with 1-butanol and isobutanol at 101.33 kPa and the vapour pressure measurements of 1-(methoxymethoxy)-2-methyl-propane in this study to provide a reference for the development of distillation technology in the process of purifying the 1-(methoxymethoxy)-2-methyl-propane.
In addition, the thermodynamic consistency for the VLE measurements was checked using traditional area test and direct test methods. The VLE measurements have been compared with the result correlated by the van Laar [4], Wilson [5] and NRTL [6] models.
Section snippets
Chemicals, sample and analysis method
Methanol and isobutanol were supplied with the help of Sinopharm Chemical Reagent. The 1-(methoxymethoxy)-2-methyl-propane (molecular structure in Fig. 1) was prepared using methanol, isobutanol and formaldehyde [7] and purified by the complicated separation technology.
The purified process of 1-(methoxymethoxy)-2-methyl-propane is similar to the methods of 1-(ethoxymethoxy)-propane that had been described in our previous paper [8]. Because methanol is excessive in the synthesis process,
Experimental results
The isobaric VLE measurements for two binary mixtures composed of 1-(methoxymethoxy)-2-methyl-propane with 1-butanol and isobutanol at 101.33 kPa are listed in Table 3. The measurements of vapour pressure for pure component 1-(methoxymethoxy)-2-methyl-propane and 1-butanol compared to these literature values [20], [21], [22], [23] are listed in Table 4. The graphical comparison for these experimental and literature data for vapour pressure of 1-butanol are depicted in Fig. 4.
The processing
Conclusions
In this work, the VLE measurements for two binary mixtures composed of 1-(methoxymethoxy)-2-methyl-propane with 1-butanol and isobutanol at 101.33 kPa were obtained and the saturated vapour pressure of pure component 1-(methoxymethoxy)-2-methyl-propane was measured by a dynamic modified Rose still. The t–x–y diagram for every binary mixture studied shows a minimum boiling azeotrope at 101.33 kPa, respectively. The azeotropic state occurs at 381.19 K and 26.72 mol% (1-butanol) for the
Acknowledgements
This study was supported by the Project of Natural Science Research of Higher Education Institutions of Jiangsu Province (No. 15KJD530001) and the Taizhou University Research project (No. TZXY2015QDXM025).
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