Viorel VOICU, Dorin BOMBOS, Ion BOLOCAN, Chol Ryong JANG, Dragos CIUPARU<br>The Influence of the Character of Emulsifiers on the <br>Performance of H4SiW12O40 . 30H2O Heteropolyacid Catalyst <br>in Glycerol Etherification with Isobutene

Viorel VOICU, Dorin BOMBOS, Ion BOLOCAN, Chol Ryong JANG, Dragos CIUPARU
The Influence of the Character of Emulsifiers on the
Performance of H4SiW12O40 . 30H2O Heteropolyacid Catalyst
in Glycerol Etherification with Isobutene

Abstract:

The heteropolyacid H4SiW12O40.30H2O proves to be a performant catalyst for glycerol etherification with isobutene, showing good conversion for both reagents and high yields to ethers. To improve the performance of the process different types of emulsifiers were used for a more intense mass transfer between the two liquid phases formed by the reactants. The experimental study on glycerol etherification with isobutene was conducted over heteropolyacid H4SiW12O40.30H2O catalyst in the presence of three types of emulsifiers: amphoteric ammonium quaternary salt C19, non-ionic ethoxylated alcohol C12-C14, and cationic Dinoram S. All emulsifiers used form direct emulsions. An increase in the concentration of the cationic emulsifier leads to a steady decrease in the yields and selectivity to desired products in spite of the higher conversion of both reagents. The non-ionic emulsifier forms a stable emulsion, independent on the pH of the reaction mixture leading to higher yields in desired products at lower concentrations. Glycerol and isobutene conversions had higher values with the amphoteric ammonium quaternary salt C19 and non-ionic ethoxylated alcohol C12-C14 emulsifiers. The distribution of the reaction products is significantly modified by the increase of the concentration of ammonium quaternary salt C19 and ethoxylated alcohol C12-C14 emulsifiers, towards the increase of the yields to di- and tri-ethers. Keywords: glycerol etherification, ethoxylated alcohol C12-C14, ammonium quaternary salt, cationic emulsifier, direct emulsion.

Issue: 2012, Volume 63, Issue 2

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