Liquefaction of lignocellulose: Do basic and acidic additives help out?

S. Kumar, Jean Paul Lange, G. van Rossum, Sascha R.A. Kersten

Research output: Contribution to journalArticleAcademicpeer-review

12 Citations (Scopus)

Abstract

Lignocellulosic feedstock can be converted to bio-oil by direct liquefaction in a phenolic solvent such as guaiacol. The bio-oil could then be further upgraded to transportation fuel using conventional oil refining process. The production of heavy components (molecular weight >1000 Da) was found to be a major hurdle in this process as it hinders the efficiency of recycling the bio-oil as liquefaction medium. This paper studies the effect of bases and acids on the liquefaction of biomass and their effectiveness in reducing the formation of heavy components. Acid was found to have a negative effect while all the bases showed a positive effect in reducing the formation of heavy components. Production of heavy components was found to depend on the pH of the medium; it decreases with increasing pH of the product measured after the reaction. Both acid and base additives got partly neutralized during the reaction and, therefore, do not operate as true catalysts. Further refill runs with KHCO3 were carried out to check the possibility to recycle the additive and the bio-oil as liquefaction medium. The additive appeared to perform poorly under recycle conditions. The base got neutralized and addition of fresh base catalyzed the degradation of the solvent (guaiacol) and the bio-oil upon oil recycling. This behavior may explain the recycling challenge faced in the PERC process. This study shows that single run experiments are insufficient to evaluate additives as they do not unravel acid/base deactivation and oil degradation. Refill runs are necessary for that
Original languageEnglish
Pages (from-to)99-104
JournalChemical Engineering Journal
Volume278
DOIs
Publication statusPublished - 18 Dec 2015

Fingerprint

Liquefaction
liquefaction
Oils
oil
Guaiacol
recycling
Recycling
acid
Acids
degradation
Degradation
lignocellulose
additive
Feedstocks
Refining
catalyst
Biomass
Molecular weight
biomass
Catalysts

Keywords

  • METIS-310659
  • IR-96036

Cite this

@article{e271b3a2b1fc4437ba5cd1c77cf7adae,
title = "Liquefaction of lignocellulose: Do basic and acidic additives help out?",
abstract = "Lignocellulosic feedstock can be converted to bio-oil by direct liquefaction in a phenolic solvent such as guaiacol. The bio-oil could then be further upgraded to transportation fuel using conventional oil refining process. The production of heavy components (molecular weight >1000 Da) was found to be a major hurdle in this process as it hinders the efficiency of recycling the bio-oil as liquefaction medium. This paper studies the effect of bases and acids on the liquefaction of biomass and their effectiveness in reducing the formation of heavy components. Acid was found to have a negative effect while all the bases showed a positive effect in reducing the formation of heavy components. Production of heavy components was found to depend on the pH of the medium; it decreases with increasing pH of the product measured after the reaction. Both acid and base additives got partly neutralized during the reaction and, therefore, do not operate as true catalysts. Further refill runs with KHCO3 were carried out to check the possibility to recycle the additive and the bio-oil as liquefaction medium. The additive appeared to perform poorly under recycle conditions. The base got neutralized and addition of fresh base catalyzed the degradation of the solvent (guaiacol) and the bio-oil upon oil recycling. This behavior may explain the recycling challenge faced in the PERC process. This study shows that single run experiments are insufficient to evaluate additives as they do not unravel acid/base deactivation and oil degradation. Refill runs are necessary for that",
keywords = "METIS-310659, IR-96036",
author = "S. Kumar and Lange, {Jean Paul} and {van Rossum}, G. and Kersten, {Sascha R.A.}",
year = "2015",
month = "12",
day = "18",
doi = "10.1016/j.cej.2014.12.026",
language = "English",
volume = "278",
pages = "99--104",
journal = "Chemical Engineering Journal",
issn = "1385-8947",
publisher = "Elsevier",

}

Liquefaction of lignocellulose: Do basic and acidic additives help out? / Kumar, S.; Lange, Jean Paul; van Rossum, G.; Kersten, Sascha R.A.

In: Chemical Engineering Journal, Vol. 278, 18.12.2015, p. 99-104.

Research output: Contribution to journalArticleAcademicpeer-review

TY - JOUR

T1 - Liquefaction of lignocellulose: Do basic and acidic additives help out?

AU - Kumar, S.

AU - Lange, Jean Paul

AU - van Rossum, G.

AU - Kersten, Sascha R.A.

PY - 2015/12/18

Y1 - 2015/12/18

N2 - Lignocellulosic feedstock can be converted to bio-oil by direct liquefaction in a phenolic solvent such as guaiacol. The bio-oil could then be further upgraded to transportation fuel using conventional oil refining process. The production of heavy components (molecular weight >1000 Da) was found to be a major hurdle in this process as it hinders the efficiency of recycling the bio-oil as liquefaction medium. This paper studies the effect of bases and acids on the liquefaction of biomass and their effectiveness in reducing the formation of heavy components. Acid was found to have a negative effect while all the bases showed a positive effect in reducing the formation of heavy components. Production of heavy components was found to depend on the pH of the medium; it decreases with increasing pH of the product measured after the reaction. Both acid and base additives got partly neutralized during the reaction and, therefore, do not operate as true catalysts. Further refill runs with KHCO3 were carried out to check the possibility to recycle the additive and the bio-oil as liquefaction medium. The additive appeared to perform poorly under recycle conditions. The base got neutralized and addition of fresh base catalyzed the degradation of the solvent (guaiacol) and the bio-oil upon oil recycling. This behavior may explain the recycling challenge faced in the PERC process. This study shows that single run experiments are insufficient to evaluate additives as they do not unravel acid/base deactivation and oil degradation. Refill runs are necessary for that

AB - Lignocellulosic feedstock can be converted to bio-oil by direct liquefaction in a phenolic solvent such as guaiacol. The bio-oil could then be further upgraded to transportation fuel using conventional oil refining process. The production of heavy components (molecular weight >1000 Da) was found to be a major hurdle in this process as it hinders the efficiency of recycling the bio-oil as liquefaction medium. This paper studies the effect of bases and acids on the liquefaction of biomass and their effectiveness in reducing the formation of heavy components. Acid was found to have a negative effect while all the bases showed a positive effect in reducing the formation of heavy components. Production of heavy components was found to depend on the pH of the medium; it decreases with increasing pH of the product measured after the reaction. Both acid and base additives got partly neutralized during the reaction and, therefore, do not operate as true catalysts. Further refill runs with KHCO3 were carried out to check the possibility to recycle the additive and the bio-oil as liquefaction medium. The additive appeared to perform poorly under recycle conditions. The base got neutralized and addition of fresh base catalyzed the degradation of the solvent (guaiacol) and the bio-oil upon oil recycling. This behavior may explain the recycling challenge faced in the PERC process. This study shows that single run experiments are insufficient to evaluate additives as they do not unravel acid/base deactivation and oil degradation. Refill runs are necessary for that

KW - METIS-310659

KW - IR-96036

U2 - 10.1016/j.cej.2014.12.026

DO - 10.1016/j.cej.2014.12.026

M3 - Article

VL - 278

SP - 99

EP - 104

JO - Chemical Engineering Journal

JF - Chemical Engineering Journal

SN - 1385-8947

ER -