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Upgrading of bio-oil: Effect of light aldehydes on acetic acid removal via esterification

Paper ID Volume ID Publish Year Pages File Format Full-Text
51129 46831 2009 4 PDF Available
Title
Upgrading of bio-oil: Effect of light aldehydes on acetic acid removal via esterification
Abstract

Since fast pyrolysis derived bio-oils are not a simple hydrocarbon mixture, but rather contain a variety of oxygenated compounds including acids and aldehydes, upgrading is required in order to use bio-oils as transportation fuels. Esterification is one of the attractive routes to convert acids contained in bio-oil to more desirable esters. Although organic acid esterification is a simple reaction, no work has been reported as to whether the presence of other reactive oxygenated compounds such as aldehydes affect the reaction. In this study of bio-oil model compounds, the impact of acetaldehyde and propionaldehyde on acetic acid esterification was investigated on organic–inorganic mesoporous silica functionalized with propylsulfonic acid groups. No impact of these two aldehydes on acetic acid consumption was seen at 100 °C, regardless of the concentration of ethanol used. However, at 70 °C and 50 °C, the conversion of acetic acid was observed to be lowered during the reaction in the presence of the aldehydes. When either of the aldehydes were present, the acetic acid conversion was about 6% and 28% lower than that in its absence at 70 °C and 50 °C, respectively. It appears that the more significant aldehyde impact on acetic acid conversion seen at the lower reaction temperatures was due to the esterification rate being slow relative to the rapid competitive acetalization rate of the aldehydes with ethanol.

Keywords
Bio-oil upgrading; Fast pyrolysis; Esterification; Functionalized mesoporous silica; Bio-oil model compounds
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Upgrading of bio-oil: Effect of light aldehydes on acetic acid removal via esterification
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Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Communications - Volume 11, Issue 2, 30 October 2009, Pages 96–99
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