Controlling Hydrothermal Reaction Pathways To Improve Acetic Acid Production from Carbohydrate Biomass

A two-step hydrothermal process to improve the production of acetic acid was discussed. The first step was to accelerate the formation of 5-hydroxymethyl-2-furaldehyde (HMF), 2-furaldehyde (2-FA), and lactic acid (LA), and the second step was to further convert the furans (HMF, 2-FA) and LA produced...

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Bibliographic Details
Published in:Environmental science & technology 2005-03, Vol.39 (6), p.1893-1902
Main Authors: Jin, Fangming, Zhou, Zhouyu, Moriya, Takehiko, Kishida, Hisanori, Higashijima, Hisao, Enomoto, Heiji
Format: Article
Language:English
Subjects:
Acetic Acid - analysis
Acids
Agriculture, rearing and food industries wastes
Applied sciences
Biomass
Bioreactors
Carbohydrate Metabolism
Carbohydrates
Chemical reactions
Exact sciences and technology
Furans - metabolism
Indicators and Reagents - analysis
Lactic Acid - metabolism
Oxidation
Oxidation-Reduction
Pollution
Wastes
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Summary:A two-step hydrothermal process to improve the production of acetic acid was discussed. The first step was to accelerate the formation of 5-hydroxymethyl-2-furaldehyde (HMF), 2-furaldehyde (2-FA), and lactic acid (LA), and the second step was to further convert the furans (HMF, 2-FA) and LA produced in the first step to acetic acid by oxidation with newly supplied oxygen. The acetic acid obtained by the two-step process had not only a high yield but also better purity. The contribution of two pathways via furans and LA in the two-step process to convert carbohydrates into acetic acid was roughly estimated as 85−90%, and the ratio of the contributions of furans and LA to yield acetic acid was estimated as 2:1. The fact that WO of carbohydrates is not capable of producing a large amount of acetic acid, while the two-step process can enhance the acetic acid yield, can be explained because formic acid is a basic product of direct oxidation of carbohydrate, and acetic acid in WO of carbohydrates may come from the oxidation of dehydration products of aldose.
ISSN:0013-936X
1520-5851
DOI:10.1021/es048867a