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Title: Characterization of coffee (Coffea arabica) husk lignin and degradation products obtained after oxygen and alkali addition

Abstract

The full use of biomass in future biorefineries has stimulated studies on utilization of lignin from agricultural crops, such as coffee husk, a major residue from coffee processing. This study focuses on characterizing the lignin obtained from coffee husk and its further wet oxidation products as a function of alkali loading, temperature and residence time. The lignin fraction after diluted acid and alkali pretreatments is composed primarily of p-hydroxylphenyl units (≥ 49%), with fewer guaiacyl and syringyl units. Linkages appear to be mainly β-O-4 ether linkages. Thermal degradation of pretreated lignin occurred in two stages. Carboxylic acids were the main degradation product. Due to the condensed structure of this lignin, relatively low yields of aromatic aldehydes were achieved, except from conditions with temperatures over 210 °C, 5 min residence time and 11.7wt% NaOH. Optimization of the pretreatment and oxidation parameters are important to maximizing yield of higher-value bioproducts from lignin.

Authors:
; ; ; ; ; ;
Publication Date:
Research Org.:
Pacific Northwest National Laboratory (PNNL), Richland, WA (US), Environmental Molecular Sciences Laboratory (EMSL)
Sponsoring Org.:
USDOE
OSTI Identifier:
1439010
Report Number(s):
PNNL-SA-131064
Journal ID: ISSN 0960-8524; 33391; KP1704020
DOE Contract Number:  
AC05-76RL01830
Resource Type:
Journal Article
Resource Relation:
Journal Name: Bioresource Technology; Journal Volume: 257; Journal Issue: C
Country of Publication:
United States
Language:
English
Subject:
Environmental Molecular Sciences Laboratory

Citation Formats

de Carvalho Oliveira, Fernanda, Srinivas, Keerthi, Helms, Gregory L., Isern, Nancy G., Cort, John R., Gonçalves, Adilson Roberto, and Ahring, Birgitte Kiær. Characterization of coffee (Coffea arabica) husk lignin and degradation products obtained after oxygen and alkali addition. United States: N. p., 2018. Web. doi:10.1016/j.biortech.2018.01.041.
de Carvalho Oliveira, Fernanda, Srinivas, Keerthi, Helms, Gregory L., Isern, Nancy G., Cort, John R., Gonçalves, Adilson Roberto, & Ahring, Birgitte Kiær. Characterization of coffee (Coffea arabica) husk lignin and degradation products obtained after oxygen and alkali addition. United States. doi:10.1016/j.biortech.2018.01.041.
de Carvalho Oliveira, Fernanda, Srinivas, Keerthi, Helms, Gregory L., Isern, Nancy G., Cort, John R., Gonçalves, Adilson Roberto, and Ahring, Birgitte Kiær. Fri . "Characterization of coffee (Coffea arabica) husk lignin and degradation products obtained after oxygen and alkali addition". United States. doi:10.1016/j.biortech.2018.01.041.
@article{osti_1439010,
title = {Characterization of coffee (Coffea arabica) husk lignin and degradation products obtained after oxygen and alkali addition},
author = {de Carvalho Oliveira, Fernanda and Srinivas, Keerthi and Helms, Gregory L. and Isern, Nancy G. and Cort, John R. and Gonçalves, Adilson Roberto and Ahring, Birgitte Kiær},
abstractNote = {The full use of biomass in future biorefineries has stimulated studies on utilization of lignin from agricultural crops, such as coffee husk, a major residue from coffee processing. This study focuses on characterizing the lignin obtained from coffee husk and its further wet oxidation products as a function of alkali loading, temperature and residence time. The lignin fraction after diluted acid and alkali pretreatments is composed primarily of p-hydroxylphenyl units (≥ 49%), with fewer guaiacyl and syringyl units. Linkages appear to be mainly β-O-4 ether linkages. Thermal degradation of pretreated lignin occurred in two stages. Carboxylic acids were the main degradation product. Due to the condensed structure of this lignin, relatively low yields of aromatic aldehydes were achieved, except from conditions with temperatures over 210 °C, 5 min residence time and 11.7wt% NaOH. Optimization of the pretreatment and oxidation parameters are important to maximizing yield of higher-value bioproducts from lignin.},
doi = {10.1016/j.biortech.2018.01.041},
journal = {Bioresource Technology},
number = C,
volume = 257,
place = {United States},
year = {Fri Jun 01 00:00:00 EDT 2018},
month = {Fri Jun 01 00:00:00 EDT 2018}
}