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Etherification of glycerol by isobutylene: Tuning the product composition

Paper ID Volume ID Publish Year Pages File Format Full-Text
41546 45892 2010 10 PDF Available
Title
Etherification of glycerol by isobutylene: Tuning the product composition
Abstract

Etherification of glycerol by isobutylene was conducted in a batch mode using acidic and partially neutralized Amberlyst-15 ionic resin, p-toluenesulfonic acid, silicotungstic acid, cesium salt of silicotungstic acid, and ionic liquid containing sulfonic acid groups. All the catalysts are comparable in terms of the initial rate of glycerol conversion into mono-ether (except cesium salt of heteropolyacid), but differ substantially with respect to the yields of higher ethers of glycerol.Ionic liquid and heteropolyacid are immiscible/insoluble in higher ethers of glycerol. As a result they have unique capability of suppressing the formation of tri-ether during the initial stage of glycerol conversion.Acidic Amberlyst-15 in the form of fine powder has the highest activity per unit weight for glycerol etherification and relatively high activity in isobutene oligomerization. Partial exchange of acidic protons with cations Na+, Ag+, Mg2+, and Al3+ decreases the rates of all the processes, but isobutylene oligomerization is suppressed more efficiently. Ag+- and Al3+-modified Amberlyst demonstrates higher yields of tri-ether and has specific pattern of interaction with gaseous isobutene distinctive to other metal-substituted Amberlysts.

Graphical abstractFigure optionsDownload full-size imageDownload high-quality image (86 K)Download as PowerPoint slideResearch highlights▶ Glycerol etherification is characterized by slow equilibration of higher ethers. ▶ Product distribution does not follow simplified kinetic model. ▶ Ionic liquid with Brønsted acid sites and heteropolyacid suppress tri-ether formation. ▶ Partial neutralization of Amberlyst 15 suppresses isobutene oligomerization.

Keywords
IB, isobutylene; HSiW, silicotungstic acid H4SiW12O40; G, glycerol; Cs2.5SiW, cesium salt Cs2.5H1.5SiW12O40; DIB, diisobutylene (mixture of 2,4,4-trimethyl-1- and 2,4,4-trimethyl-2-pentenes); IL-6, 1-(4-sulfobutyl)-3-hexylimidazolium trifluoromethanesulfo
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Etherification of glycerol by isobutylene: Tuning the product composition
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 390, Issues 1–2, 20 December 2010, Pages 235–244
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
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Price after discount Only $4.95
100% Money Back Guarantee
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Online Support
Any Questions? feel free to contact us