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Use of hemicellulose hydrolate in the production of fatty acids. Udnyttelse af hemicellulosehydrolysat til fremstilling af fede syrer

Abstract

Cellulose fibers can be produced from straw by an organosolve process or similar week acid hydrolysis. The hydrolysate sugars can further be converted to volatile fatty acids by fermentation. The composition of the hydrolysate was analyzed. Xylose was predominant, but in a lower contration than expected from the overall COD-content. This study has shown that if the fermentation is carried out in a fixed film reactor, composition of the acid mixture in the broth yield and conversion speed are strongly dependent on pH and retention time. The production of the more valuable acids, such as lactic acid and butyric acid is favored by a pH around 6,0. Lactid acid should be produced at low retention times of app. 4 hours or less, whereas butyric acid requires retention times of 40 - 60 hours. Attempt to recover the acids by extraction with a solvent compose of tertiary amines and nonylphenol did not prove to be succesful. Other ways of recovering the acids reported in the litterature have been studied and are going to be tested out in the second phase of the project.
Publication Date:
Jun 15, 1988
Product Type:
Technical Report
Report Number:
NEI-DK-166
Reference Number:
DK-89-001175; EDB-89-086841
Resource Relation:
Other Information: EFP-87
Subject:
59 BASIC BIOLOGICAL SCIENCES; FERMENTATION; HEMICELLULOSE; STRAW; ORGANIC ACIDS; BIOCONVERSION; CARBOHYDRATES; ORGANIC COMPOUNDS; POLYSACCHARIDES; SACCHARIDES; 550200* - Biochemistry
OSTI ID:
7782961
Research Organizations:
Teknologisk Inst., Taastrup (Denmark). Bioteknik
Country of Origin:
Denmark
Language:
Danish
Other Identifying Numbers:
Other: ON: DE89766868
Availability:
NTIS (US Sales Only), PC A04/MF A01; 1.
Submitting Site:
DK
Size:
Pages: 65
Announcement Date:
Oct 01, 1988

Citation Formats

Hamann Spendler, F. Use of hemicellulose hydrolate in the production of fatty acids. Udnyttelse af hemicellulosehydrolysat til fremstilling af fede syrer. Denmark: N. p., 1988. Web.
Hamann Spendler, F. Use of hemicellulose hydrolate in the production of fatty acids. Udnyttelse af hemicellulosehydrolysat til fremstilling af fede syrer. Denmark.
Hamann Spendler, F. 1988. "Use of hemicellulose hydrolate in the production of fatty acids. Udnyttelse af hemicellulosehydrolysat til fremstilling af fede syrer." Denmark.
@misc{etde_7782961,
title = {Use of hemicellulose hydrolate in the production of fatty acids. Udnyttelse af hemicellulosehydrolysat til fremstilling af fede syrer}
author = {Hamann Spendler, F.}
abstractNote = {Cellulose fibers can be produced from straw by an organosolve process or similar week acid hydrolysis. The hydrolysate sugars can further be converted to volatile fatty acids by fermentation. The composition of the hydrolysate was analyzed. Xylose was predominant, but in a lower contration than expected from the overall COD-content. This study has shown that if the fermentation is carried out in a fixed film reactor, composition of the acid mixture in the broth yield and conversion speed are strongly dependent on pH and retention time. The production of the more valuable acids, such as lactic acid and butyric acid is favored by a pH around 6,0. Lactid acid should be produced at low retention times of app. 4 hours or less, whereas butyric acid requires retention times of 40 - 60 hours. Attempt to recover the acids by extraction with a solvent compose of tertiary amines and nonylphenol did not prove to be succesful. Other ways of recovering the acids reported in the litterature have been studied and are going to be tested out in the second phase of the project.}
place = {Denmark}
year = {1988}
month = {Jun}
}