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Effect of alkaline and autohydrolysis processes on the purity of obtained hemicelluloses from corn stalks.

Abstract：

:A study of the potential of autohydrolysis and alkaline extraction processes from corn stalks was performed for high purity hemicellulose extraction. The influence of process parameters on the purity of obtained hemicelluloses was analyzed. An experimental design was developed for the autohydrolysis treatments to determine the optimal conditions to solubilize the hemicelluloses with lowest content in contaminants. On the other hand, alkaline extraction, including raw material pretreatment (dewaxing and delignification step) was carried out analyzing the effectiveness of this processes for maximum pure hemicellulose recovery. The maximum yield (54% of the raw material hemicelluloses) and the best physicochemical properties (highest hemicellulose content free of lignin) were obtained with these pretreatments in alkaline extraction. Moreover, the effect of lignin removal by sulfuric acid from the autohydrolysis liquors before hemicellulose precipitation was studied. This purification step has allowed to obtain lignin-free autohydrolysis hemicellulose but with the presence of sulfur as predominant contaminant.

journal_name

Bioresour Technol

journal_title

Bioresource technology

authors

Egüés I,Sanchez C,Mondragon I,Labidi J

doi

10.1016/j.biortech.2011.09.139

subject

Has Abstract

pub_date

2012-01-01 00:00:00

pages

239-48

issue

1

eissn

0960-8524

issn

1873-2976

pii

S0960-8524(11)01427-1

journal_volume

103

pub_type

杂志文章

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