Imidazole

Prospect Solvent for Lignocellulosic Biomass Fractionation and Delignification

A R C Morais, J V Pinto, D Nunes, Luísa B. Roseiro, M C Oliveira, E Fortunato, Rafał Bogel-Łukasik

Research output: Contribution to journalArticle

41 Citations (Scopus)

Abstract

The future widespread production of biomass-derived fuels, chemicals, and materials requires cost-effective processing of sustainable feedstock. The use of imidazole as a solvent for biomass creates a novel approach that helps to accomplish this idea in a green fashion. This work proposes imidazole as a novel solvent for wheat straw pretreatment, which allowed the production of cellulose- and hemicellulose-rich fractions and added-value products from depolymerization of lignin. Various temperatures (110, 140, and 170 °C) and processing times (1, 2, and 4 h) of pretreatment were investigated. Both cellulose and hemicellulose recovery were highly dependent on reaction temperature. The best result for the recovery of cellulose-rich material was obtained at 170 °C for 2 h, achieving 62.4% w·w-1, whereas native wheat straw is composed by only 38.8% w·w-1 cellulose. For the same conditions, optimal results were also obtained regarding the enzymatic hydrolysis yield (99.3% w·w-1 glucan to glucose yield) in cellulose-rich material. This result was possible to be obtained due to morphological and structural changes in cellulose-rich materials accompanied by extensive delignification (up to 92%). The presence of added-value phenolic compounds in recovered imidazole was analyzed by capillary electrophoresis and HPLC-MS. Vanillin and other lignin-based products were identified. Finally, the high purity of recovered imidazole was demonstrated by 1H and 13C NMR.

Original languageEnglish
Pages (from-to)1643-1652
Number of pages10
JournalACS SUSTAINABLE CHEMISTRY & ENGINEERING
Volume4
Issue number3
DOIs
Publication statusPublished - 7 Mar 2016

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Delignification
Fractionation
Cellulose
cellulose
Biomass
fractionation
biomass
Lignin
Straw
straw
lignin
wheat
Recovery
Capillary electrophoresis
Depolymerization
Enzymatic hydrolysis
Glucans
phenolic compound
Processing
structural change

Keywords

  • Biorefinery
  • Crystallinity
  • Delignification
  • Enzymatic hydrolysis
  • Green solvent
  • Imidazole
  • Lignocellulose
  • Pretreatment

Cite this

Morais, A R C ; Pinto, J V ; Nunes, D ; Roseiro, Luísa B. ; Oliveira, M C ; Fortunato, E ; Bogel-Łukasik, Rafał. / Imidazole : Prospect Solvent for Lignocellulosic Biomass Fractionation and Delignification. In: ACS SUSTAINABLE CHEMISTRY & ENGINEERING. 2016 ; Vol. 4, No. 3. pp. 1643-1652.
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abstract = "The future widespread production of biomass-derived fuels, chemicals, and materials requires cost-effective processing of sustainable feedstock. The use of imidazole as a solvent for biomass creates a novel approach that helps to accomplish this idea in a green fashion. This work proposes imidazole as a novel solvent for wheat straw pretreatment, which allowed the production of cellulose- and hemicellulose-rich fractions and added-value products from depolymerization of lignin. Various temperatures (110, 140, and 170 °C) and processing times (1, 2, and 4 h) of pretreatment were investigated. Both cellulose and hemicellulose recovery were highly dependent on reaction temperature. The best result for the recovery of cellulose-rich material was obtained at 170 °C for 2 h, achieving 62.4{\%} w·w-1, whereas native wheat straw is composed by only 38.8{\%} w·w-1 cellulose. For the same conditions, optimal results were also obtained regarding the enzymatic hydrolysis yield (99.3{\%} w·w-1 glucan to glucose yield) in cellulose-rich material. This result was possible to be obtained due to morphological and structural changes in cellulose-rich materials accompanied by extensive delignification (up to 92{\%}). The presence of added-value phenolic compounds in recovered imidazole was analyzed by capillary electrophoresis and HPLC-MS. Vanillin and other lignin-based products were identified. Finally, the high purity of recovered imidazole was demonstrated by 1H and 13C NMR.",
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note = "Sem PDF. This work was supported by the Fundacao para a Ciencia e Tecnologia (FCT, Portugal) through the Bilateral Cooperation project FCT/CAPES 2014/2015 (FCT/1909/27/2/2014/S), strategic projects UID/CTM/50025/2013, UId/QUI/5006/2013, UId/QUI/00100/2013, and REM2013 and RECI/QEQ-MED/0330/2012, and grants SFRH/BD/94297/2013 (ARCM) and IF/00424/2013 (RBL). The NMR spectrometers are part of The National NMR Facility, supported by Fundacao para a Ciencia e a Tecnologia (RECI/BBB-BQB/0230/2012). The work was also supported by CAPES (Brazil) through the Pesquisador Visitante Especial 155/2012 project. The work presented in this paper was carried out in the frame of the EUBis COST Action TD1203 Food Waste Valorisation for Sustainable Chemicals, Materials and Fuels.",
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Imidazole : Prospect Solvent for Lignocellulosic Biomass Fractionation and Delignification. / Morais, A R C; Pinto, J V; Nunes, D; Roseiro, Luísa B.; Oliveira, M C; Fortunato, E; Bogel-Łukasik, Rafał.

In: ACS SUSTAINABLE CHEMISTRY & ENGINEERING, Vol. 4, No. 3, 07.03.2016, p. 1643-1652.

Research output: Contribution to journalArticle

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T2 - Prospect Solvent for Lignocellulosic Biomass Fractionation and Delignification

AU - Morais, A R C

AU - Pinto, J V

AU - Nunes, D

AU - Roseiro, Luísa B.

AU - Oliveira, M C

AU - Fortunato, E

AU - Bogel-Łukasik, Rafał

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PY - 2016/3/7

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N2 - The future widespread production of biomass-derived fuels, chemicals, and materials requires cost-effective processing of sustainable feedstock. The use of imidazole as a solvent for biomass creates a novel approach that helps to accomplish this idea in a green fashion. This work proposes imidazole as a novel solvent for wheat straw pretreatment, which allowed the production of cellulose- and hemicellulose-rich fractions and added-value products from depolymerization of lignin. Various temperatures (110, 140, and 170 °C) and processing times (1, 2, and 4 h) of pretreatment were investigated. Both cellulose and hemicellulose recovery were highly dependent on reaction temperature. The best result for the recovery of cellulose-rich material was obtained at 170 °C for 2 h, achieving 62.4% w·w-1, whereas native wheat straw is composed by only 38.8% w·w-1 cellulose. For the same conditions, optimal results were also obtained regarding the enzymatic hydrolysis yield (99.3% w·w-1 glucan to glucose yield) in cellulose-rich material. This result was possible to be obtained due to morphological and structural changes in cellulose-rich materials accompanied by extensive delignification (up to 92%). The presence of added-value phenolic compounds in recovered imidazole was analyzed by capillary electrophoresis and HPLC-MS. Vanillin and other lignin-based products were identified. Finally, the high purity of recovered imidazole was demonstrated by 1H and 13C NMR.

AB - The future widespread production of biomass-derived fuels, chemicals, and materials requires cost-effective processing of sustainable feedstock. The use of imidazole as a solvent for biomass creates a novel approach that helps to accomplish this idea in a green fashion. This work proposes imidazole as a novel solvent for wheat straw pretreatment, which allowed the production of cellulose- and hemicellulose-rich fractions and added-value products from depolymerization of lignin. Various temperatures (110, 140, and 170 °C) and processing times (1, 2, and 4 h) of pretreatment were investigated. Both cellulose and hemicellulose recovery were highly dependent on reaction temperature. The best result for the recovery of cellulose-rich material was obtained at 170 °C for 2 h, achieving 62.4% w·w-1, whereas native wheat straw is composed by only 38.8% w·w-1 cellulose. For the same conditions, optimal results were also obtained regarding the enzymatic hydrolysis yield (99.3% w·w-1 glucan to glucose yield) in cellulose-rich material. This result was possible to be obtained due to morphological and structural changes in cellulose-rich materials accompanied by extensive delignification (up to 92%). The presence of added-value phenolic compounds in recovered imidazole was analyzed by capillary electrophoresis and HPLC-MS. Vanillin and other lignin-based products were identified. Finally, the high purity of recovered imidazole was demonstrated by 1H and 13C NMR.

KW - Biorefinery

KW - Crystallinity

KW - Delignification

KW - Enzymatic hydrolysis

KW - Green solvent

KW - Imidazole

KW - Lignocellulose

KW - Pretreatment

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M3 - Article

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JO - ACS SUSTAINABLE CHEMISTRY & ENGINEERING

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