Continuous Hydrothermal Co-liquefaction of Aspen Wood and Glycerol with Water Phase Recirculation

Thomas Helmer Pedersen, Ionela Grigoras, Jessica Hoffmann, Saqib Sohail Toor, Iulia Maria Daraban, Claus Uhrenholt Jensen, Steen Iversen, René Madsen, Marianne Glacius, Katarzyna Ratajczyk Arturi, Rudi Pankratz Nielsen, Erik Gydesen Søgaard, Lasse Aistrup Rosendahl

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Abstract

Hydrothermal liquefaction is a promising technology for the conversion of a wide range of bio-feedstock into a biocrude; a mixture of chemical compounds that holds the potential for a renewable production of chemicals and fuels. Most research in hydrothermal liquefaction is performed in batch type reactors, although a continuous and energy-efficient operation is paramount for such process to be feasible. In this work an experimental campaign in a continuous bench scale unit is presented. The campaign is based on glycerol-assisted hydrothermal liquefaction of aspen wood carried out with the presence of a homogeneous catalyst at supercritical water conditions, 400 °°C and 300 bar. Furthermore, in the experimental campaign a water phase recirculation step is incorporated to evaluate the technical feasibility of such procedure. In total, four batches of approximately 100 kg of feed each were processed successfully at steady state conditions without any observation of system malfunctioning. The biocrude obtained was characterized using several analytical methods to evaluate the feasibility of the process and the quality of the product. Results showed that a high quality biocrude was obtained having a higher heating value of 34.3 MJ/kg. The volatile fraction of the biocrude consisted mostly of compounds having number of carbon atoms in the C6–C12 range similar to gasoline. In terms of process feasibility, it was revealed that total organic carbon (TOC) and ash significantly accumulated in the water phase when such is recirculated for the proceeding batch. After four batches the TOC and the ash mass fraction of the water phase were 136.2 [g/L] and 12.6 [%], respectively. Water phase recirculation showed a slight increase in the biocrude quality in terms on an effective hydrogen-to-carbon ratio, but it showed no effects on the product gas composition or the pH of the water phase. The successful operation demonstrated the technical feasibility of a continuous production of high quality biocrude.
Original languageEnglish
JournalApplied Energy
Volume162
Pages (from-to)1034–1041
Number of pages8
ISSN0306-2619
DOIs
Publication statusPublished - Jan 2016

Fingerprint

Liquefaction
Glycerol
liquefaction
Wood
Ashes
Water
Organic carbon
water
total organic carbon
ash
Chemical compounds
Carbon
chemical compound
carbon
Feedstocks
Gasoline
analytical method
catalyst
hydrogen
heating

Keywords

  • Biofuel
  • Continuous processing
  • Biocrude
  • Biomass
  • Hydrothermal liquefaction
  • Sustainability

Cite this

Pedersen, Thomas Helmer ; Grigoras, Ionela ; Hoffmann, Jessica ; Toor, Saqib Sohail ; Daraban, Iulia Maria ; Jensen, Claus Uhrenholt ; Iversen, Steen ; Madsen, René ; Glacius, Marianne ; Arturi, Katarzyna Ratajczyk ; Nielsen, Rudi Pankratz ; Søgaard, Erik Gydesen ; Rosendahl, Lasse Aistrup. / Continuous Hydrothermal Co-liquefaction of Aspen Wood and Glycerol with Water Phase Recirculation. In: Applied Energy. 2016 ; Vol. 162. pp. 1034–1041.
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abstract = "Hydrothermal liquefaction is a promising technology for the conversion of a wide range of bio-feedstock into a biocrude; a mixture of chemical compounds that holds the potential for a renewable production of chemicals and fuels. Most research in hydrothermal liquefaction is performed in batch type reactors, although a continuous and energy-efficient operation is paramount for such process to be feasible. In this work an experimental campaign in a continuous bench scale unit is presented. The campaign is based on glycerol-assisted hydrothermal liquefaction of aspen wood carried out with the presence of a homogeneous catalyst at supercritical water conditions, 400 °°C and 300 bar. Furthermore, in the experimental campaign a water phase recirculation step is incorporated to evaluate the technical feasibility of such procedure. In total, four batches of approximately 100 kg of feed each were processed successfully at steady state conditions without any observation of system malfunctioning. The biocrude obtained was characterized using several analytical methods to evaluate the feasibility of the process and the quality of the product. Results showed that a high quality biocrude was obtained having a higher heating value of 34.3 MJ/kg. The volatile fraction of the biocrude consisted mostly of compounds having number of carbon atoms in the C6–C12 range similar to gasoline. In terms of process feasibility, it was revealed that total organic carbon (TOC) and ash significantly accumulated in the water phase when such is recirculated for the proceeding batch. After four batches the TOC and the ash mass fraction of the water phase were 136.2 [g/L] and 12.6 [{\%}], respectively. Water phase recirculation showed a slight increase in the biocrude quality in terms on an effective hydrogen-to-carbon ratio, but it showed no effects on the product gas composition or the pH of the water phase. The successful operation demonstrated the technical feasibility of a continuous production of high quality biocrude.",
keywords = "Biofuel, Continuous processing, Biocrude, Biomass, Hydrothermal liquefaction, Sustainability",
author = "Pedersen, {Thomas Helmer} and Ionela Grigoras and Jessica Hoffmann and Toor, {Saqib Sohail} and Daraban, {Iulia Maria} and Jensen, {Claus Uhrenholt} and Steen Iversen and Ren{\'e} Madsen and Marianne Glacius and Arturi, {Katarzyna Ratajczyk} and Nielsen, {Rudi Pankratz} and S{\o}gaard, {Erik Gydesen} and Rosendahl, {Lasse Aistrup}",
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Continuous Hydrothermal Co-liquefaction of Aspen Wood and Glycerol with Water Phase Recirculation. / Pedersen, Thomas Helmer; Grigoras, Ionela; Hoffmann, Jessica; Toor, Saqib Sohail; Daraban, Iulia Maria; Jensen, Claus Uhrenholt; Iversen, Steen; Madsen, René; Glacius, Marianne; Arturi, Katarzyna Ratajczyk; Nielsen, Rudi Pankratz; Søgaard, Erik Gydesen; Rosendahl, Lasse Aistrup.

In: Applied Energy, Vol. 162, 01.2016, p. 1034–1041.

Research output: Contribution to journalJournal articleResearchpeer-review

TY - JOUR

T1 - Continuous Hydrothermal Co-liquefaction of Aspen Wood and Glycerol with Water Phase Recirculation

AU - Pedersen, Thomas Helmer

AU - Grigoras, Ionela

AU - Hoffmann, Jessica

AU - Toor, Saqib Sohail

AU - Daraban, Iulia Maria

AU - Jensen, Claus Uhrenholt

AU - Iversen, Steen

AU - Madsen, René

AU - Glacius, Marianne

AU - Arturi, Katarzyna Ratajczyk

AU - Nielsen, Rudi Pankratz

AU - Søgaard, Erik Gydesen

AU - Rosendahl, Lasse Aistrup

PY - 2016/1

Y1 - 2016/1

N2 - Hydrothermal liquefaction is a promising technology for the conversion of a wide range of bio-feedstock into a biocrude; a mixture of chemical compounds that holds the potential for a renewable production of chemicals and fuels. Most research in hydrothermal liquefaction is performed in batch type reactors, although a continuous and energy-efficient operation is paramount for such process to be feasible. In this work an experimental campaign in a continuous bench scale unit is presented. The campaign is based on glycerol-assisted hydrothermal liquefaction of aspen wood carried out with the presence of a homogeneous catalyst at supercritical water conditions, 400 °°C and 300 bar. Furthermore, in the experimental campaign a water phase recirculation step is incorporated to evaluate the technical feasibility of such procedure. In total, four batches of approximately 100 kg of feed each were processed successfully at steady state conditions without any observation of system malfunctioning. The biocrude obtained was characterized using several analytical methods to evaluate the feasibility of the process and the quality of the product. Results showed that a high quality biocrude was obtained having a higher heating value of 34.3 MJ/kg. The volatile fraction of the biocrude consisted mostly of compounds having number of carbon atoms in the C6–C12 range similar to gasoline. In terms of process feasibility, it was revealed that total organic carbon (TOC) and ash significantly accumulated in the water phase when such is recirculated for the proceeding batch. After four batches the TOC and the ash mass fraction of the water phase were 136.2 [g/L] and 12.6 [%], respectively. Water phase recirculation showed a slight increase in the biocrude quality in terms on an effective hydrogen-to-carbon ratio, but it showed no effects on the product gas composition or the pH of the water phase. The successful operation demonstrated the technical feasibility of a continuous production of high quality biocrude.

AB - Hydrothermal liquefaction is a promising technology for the conversion of a wide range of bio-feedstock into a biocrude; a mixture of chemical compounds that holds the potential for a renewable production of chemicals and fuels. Most research in hydrothermal liquefaction is performed in batch type reactors, although a continuous and energy-efficient operation is paramount for such process to be feasible. In this work an experimental campaign in a continuous bench scale unit is presented. The campaign is based on glycerol-assisted hydrothermal liquefaction of aspen wood carried out with the presence of a homogeneous catalyst at supercritical water conditions, 400 °°C and 300 bar. Furthermore, in the experimental campaign a water phase recirculation step is incorporated to evaluate the technical feasibility of such procedure. In total, four batches of approximately 100 kg of feed each were processed successfully at steady state conditions without any observation of system malfunctioning. The biocrude obtained was characterized using several analytical methods to evaluate the feasibility of the process and the quality of the product. Results showed that a high quality biocrude was obtained having a higher heating value of 34.3 MJ/kg. The volatile fraction of the biocrude consisted mostly of compounds having number of carbon atoms in the C6–C12 range similar to gasoline. In terms of process feasibility, it was revealed that total organic carbon (TOC) and ash significantly accumulated in the water phase when such is recirculated for the proceeding batch. After four batches the TOC and the ash mass fraction of the water phase were 136.2 [g/L] and 12.6 [%], respectively. Water phase recirculation showed a slight increase in the biocrude quality in terms on an effective hydrogen-to-carbon ratio, but it showed no effects on the product gas composition or the pH of the water phase. The successful operation demonstrated the technical feasibility of a continuous production of high quality biocrude.

KW - Biofuel

KW - Continuous processing

KW - Biocrude

KW - Biomass

KW - Hydrothermal liquefaction

KW - Sustainability

U2 - 10.1016/j.apenergy.2015.10.165

DO - 10.1016/j.apenergy.2015.10.165

M3 - Journal article

VL - 162

SP - 1034

EP - 1041

JO - Applied Energy

JF - Applied Energy

SN - 0306-2619

ER -