Two-stage alkaline hydrothermal liquefaction of wood to biocrude in a continuous bench-scale system

Iulia-Maria Sintamarean, Ionela Grigoras, Claus Uhrenholt Jensen, Saqib Sohail Toor, Thomas Helmer Pedersen, Lasse Aistrup Rosendahl

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16 Citations (Scopus)
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Abstract

Feedstock pumpability is one of the main obstacles for continuous processing of biomass through hydrothermal liquefaction (HTL), due to their tendency to form heterogeneous slurries. In this work, a novel strategy is proposed to ensure lignocellulosic feed pumpability in HTL processing, even while applying elevated biomass loadings. In the first stage, a pumpable feed is prepared by an alkaline treatment of coarse wood chips at 180 °C, 120-min reaction time, and 0.35 NaOH-to-wood ratio. In a subsequent stage, the treated feedstock is converted into a biocrude in a continuously operated 20 kg/h scale unit. In total, 100 kg of wood paste with 25% dry matter is processed at 400 °C and 30 MPa, demonstrating the usefulness of this two-stage liquefaction strategy. An additional advantage liquefaction of such pretreated wood shows increased biocrude yields with approximately 10% compared to the case where non-pretreated wood is liquefied.
Original languageEnglish
JournalBiomass Conversion and Biorefinery
Volume7
Issue number4
Pages (from-to)425-435
Number of pages11
ISSN2190-6815
DOIs
Publication statusPublished - Nov 2017

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Liquefaction
Wood
Feedstocks
Biomass
Slurries
Processing

Keywords

  • Lignocellulosic
  • Feedstock pumpability
  • Alkaline pretreatment
  • Biocrude

Cite this

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title = "Two-stage alkaline hydrothermal liquefaction of wood to biocrude in a continuous bench-scale system",
abstract = "Feedstock pumpability is one of the main obstacles for continuous processing of biomass through hydrothermal liquefaction (HTL), due to their tendency to form heterogeneous slurries. In this work, a novel strategy is proposed to ensure lignocellulosic feed pumpability in HTL processing, even while applying elevated biomass loadings. In the first stage, a pumpable feed is prepared by an alkaline treatment of coarse wood chips at 180 °C, 120-min reaction time, and 0.35 NaOH-to-wood ratio. In a subsequent stage, the treated feedstock is converted into a biocrude in a continuously operated 20 kg/h scale unit. In total, 100 kg of wood paste with 25{\%} dry matter is processed at 400 °C and 30 MPa, demonstrating the usefulness of this two-stage liquefaction strategy. An additional advantage liquefaction of such pretreated wood shows increased biocrude yields with approximately 10{\%} compared to the case where non-pretreated wood is liquefied.",
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author = "Iulia-Maria Sintamarean and Ionela Grigoras and Jensen, {Claus Uhrenholt} and Toor, {Saqib Sohail} and Pedersen, {Thomas Helmer} and Rosendahl, {Lasse Aistrup}",
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journal = "Biomass Conversion and Biorefinery",
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Two-stage alkaline hydrothermal liquefaction of wood to biocrude in a continuous bench-scale system. / Sintamarean, Iulia-Maria; Grigoras, Ionela; Jensen, Claus Uhrenholt; Toor, Saqib Sohail; Pedersen, Thomas Helmer; Rosendahl, Lasse Aistrup.

In: Biomass Conversion and Biorefinery, Vol. 7, No. 4, 11.2017, p. 425-435.

Research output: Contribution to journalJournal articleResearchpeer-review

TY - JOUR

T1 - Two-stage alkaline hydrothermal liquefaction of wood to biocrude in a continuous bench-scale system

AU - Sintamarean, Iulia-Maria

AU - Grigoras, Ionela

AU - Jensen, Claus Uhrenholt

AU - Toor, Saqib Sohail

AU - Pedersen, Thomas Helmer

AU - Rosendahl, Lasse Aistrup

PY - 2017/11

Y1 - 2017/11

N2 - Feedstock pumpability is one of the main obstacles for continuous processing of biomass through hydrothermal liquefaction (HTL), due to their tendency to form heterogeneous slurries. In this work, a novel strategy is proposed to ensure lignocellulosic feed pumpability in HTL processing, even while applying elevated biomass loadings. In the first stage, a pumpable feed is prepared by an alkaline treatment of coarse wood chips at 180 °C, 120-min reaction time, and 0.35 NaOH-to-wood ratio. In a subsequent stage, the treated feedstock is converted into a biocrude in a continuously operated 20 kg/h scale unit. In total, 100 kg of wood paste with 25% dry matter is processed at 400 °C and 30 MPa, demonstrating the usefulness of this two-stage liquefaction strategy. An additional advantage liquefaction of such pretreated wood shows increased biocrude yields with approximately 10% compared to the case where non-pretreated wood is liquefied.

AB - Feedstock pumpability is one of the main obstacles for continuous processing of biomass through hydrothermal liquefaction (HTL), due to their tendency to form heterogeneous slurries. In this work, a novel strategy is proposed to ensure lignocellulosic feed pumpability in HTL processing, even while applying elevated biomass loadings. In the first stage, a pumpable feed is prepared by an alkaline treatment of coarse wood chips at 180 °C, 120-min reaction time, and 0.35 NaOH-to-wood ratio. In a subsequent stage, the treated feedstock is converted into a biocrude in a continuously operated 20 kg/h scale unit. In total, 100 kg of wood paste with 25% dry matter is processed at 400 °C and 30 MPa, demonstrating the usefulness of this two-stage liquefaction strategy. An additional advantage liquefaction of such pretreated wood shows increased biocrude yields with approximately 10% compared to the case where non-pretreated wood is liquefied.

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