The Influence of Ethanol Extraction in the High Temperature Steaming Induced Discoloration Process of Locust (Robinia pseudoacacia) Wood

Abstract:

The purpose of the experiment is to get more ideal color and raise the value of Locust wood after heat treatment. We chose ethanol as the solvent and heated locust wood in vapor environment at 120°C for 24 hours. Compare the infrared absorption spectrum of heat treated powder and heat treated powder after extracted. It turned out that: (1) extraction could wipe out the great mass of substance with ethenyl(C=C), ether bond(C-O-C), hydroxy (-OH) and aromatic ring; (2) The synthetic reaction and decomposition reaction of ethenyl(C=C), ether bond(C-O-C), hydroxy (-OH) and aromatic ring would lead to decrease of b* and rise of a*, but have no impact on L*;(3) Heat treatment would reduce the number of aromatic nucleus. Hydroxyl would be oxidized to carbonyl group. Instauration organic esters produced. Heat treated wood after extracted wouldn’t occur these reaction. Powder’s infrared absorption spectrum also shows that functional group in aromatic ring has decreased after extraction and heat treated.

• Periodical: Advanced Materials Research (Volumes 538-541)
• Pages: 2194-2198
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.538-541.2194
• Online since: June 2012
• Authors: Peng Zhang, Yong Ming Fan, Jian Min Gao
• Keywords: Ethanol Extract, Induced Discoloration, Structure of Extraction

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