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Bifunctional temperature-sensitive amphiphilic acidic ionic liquids for preparation of biodiesel

Paper ID Volume ID Publish Year Pages File Format Full-Text
55259 47045 2013 6 PDF Available
Title
Bifunctional temperature-sensitive amphiphilic acidic ionic liquids for preparation of biodiesel
Abstract

Several water-stable bifunctional temperature-sensitive amphiphilic Bronsted-acidic ionic liquids with an alkane sulfonic acid group and a polyether group were synthesized through polyethylene glycol monomethylether as raw material. The properties and structures of the ionic liquids were experimentally characterized. Esterification of oleic acid with methanol to biodiesel was investigated in various bifunctional temperature-sensitive amphiphilic acidic ionic liquids. The amphiphilicity, temperature-sensitive, polymerization degree, acidity and activity correlation for the ionic liquids were studied. It was found that their structures were consistent with the designed structure and their purities were high. Among all these ionic liquids, the ionic liquid – MPEG-350-ILs showed the best catalytic activity that is near to that of concentrated sulfuric acid, which is ascribed to its strong Brønsted acidity and amphiphilicity. The catalytic activity of each ILs is dependent on the polymerization degree of polyether cation. The catalytic activity decreased with lengthening polyether chain of ionic liquids. These ionic liquids exhibited temperature-sensitive property. The produced biodiesel could be separated via simple decantation and the ionic liquids could be reused.

Graphical abstractConversion of oleic acid versus reaction time in the different ionic liquids or concentrated sulfuric acid.Figure optionsDownload full-size imageDownload high-quality image (107 K)Download as PowerPoint slideHighlights► Bifunctional temperature-sensitive amphiphilic acidic ionic liquids were synthesized. ► The polyether group possesses homogeneous reaction at high temperature and biophase at room temperature. ► The MPEG-350-ILs showed the best catalytic activity that is near to that of H2SO4. ► The catalytic activity of ILs is dependent on the polymerization degree of polyether. ► The biodiesel could be separated via decantation and ionic liquids could be reused.

Keywords
Ionic liquids; Biodiesel; Acid catalysis; Polyether; Temperature-sensitivity
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Bifunctional temperature-sensitive amphiphilic acidic ionic liquids for preparation of biodiesel
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Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Today - Volume 200, 1 February 2013, Pages 74–79
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
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us