Controlling the phase stability of biomass fast pyrolysis bio-oils

Anja Oasmaa (Corresponding Author), Tom Sundqvist, Eeva Kuoppala, Manuel Garcia-Perez, Yrjö Solantausta, Christian Lindfors, Ville Paasikallio

Research output: Contribution to journalArticleScientificpeer-review

49 Citations (Scopus)

Abstract

Fast pyrolysis bio-oil oil is a promising alternative to fossil fuels and is currently entering the heating oil market. However, there is a lack of available information about the phase stability of bio-oil. The water-soluble and water-insoluble compounds in bio-oil can either be in one homogeneous phase or form two individual phases, to which we refer to as phase separation. Phase separation can occur immediately after condensation of the pyrolysis vapors to bio-oil because of certain pyrolysis conditions or type of raw material or after years of aging because of changes in composition caused by repolymerization reactions. We present how the phase separation of bio-oils is related to the chemical composition and show that the probability of phase separation can be predicted with a numerical stability index based on the chemical composition. The chemical composition of the bio-oils studied was characterized using a solvent extraction scheme that describes the composition of bio-oil as a blend of three macro fractions: C1-C6 oxygenated molecules (named co-solvents), water-insoluble molecules, and water-soluble polar molecules (including water but excluding the co-solvents), e.g., anhydrosugars. The results show that the required amount of co-solvent to dissolve both fractions and keep the bio-oil homogeneous varies depending upon the chemical composition. The minimum amount of co-solvent for homogeneous bio-oils was observed to be from 15 to 30 wt %. The correlation between the chemical composition and homogeneity of fresh and aged bio-oils is shown in ternary-phase diagrams. Addition experiments were made with model compounds to cover a larger part of the phase diagram.
Original languageEnglish
Pages (from-to)4373-4381
JournalEnergy & Fuels
Volume29
Issue number7
DOIs
Publication statusPublished - 2015
MoE publication typeA1 Journal article-refereed

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Phase stability
Oils
Biomass
Pyrolysis
Phase separation
Chemical analysis
Water
Molecules
Phase diagrams
Convergence of numerical methods
Solvent extraction
Fossil fuels
Macros
Condensation
Raw materials
Aging of materials
Vapors

Cite this

Oasmaa, A., Sundqvist, T., Kuoppala, E., Garcia-Perez, M., Solantausta, Y., Lindfors, C., & Paasikallio, V. (2015). Controlling the phase stability of biomass fast pyrolysis bio-oils. Energy & Fuels, 29(7), 4373-4381. https://doi.org/10.1021/acs.energyfuels.5b00607
Oasmaa, Anja ; Sundqvist, Tom ; Kuoppala, Eeva ; Garcia-Perez, Manuel ; Solantausta, Yrjö ; Lindfors, Christian ; Paasikallio, Ville. / Controlling the phase stability of biomass fast pyrolysis bio-oils. In: Energy & Fuels. 2015 ; Vol. 29, No. 7. pp. 4373-4381.
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abstract = "Fast pyrolysis bio-oil oil is a promising alternative to fossil fuels and is currently entering the heating oil market. However, there is a lack of available information about the phase stability of bio-oil. The water-soluble and water-insoluble compounds in bio-oil can either be in one homogeneous phase or form two individual phases, to which we refer to as phase separation. Phase separation can occur immediately after condensation of the pyrolysis vapors to bio-oil because of certain pyrolysis conditions or type of raw material or after years of aging because of changes in composition caused by repolymerization reactions. We present how the phase separation of bio-oils is related to the chemical composition and show that the probability of phase separation can be predicted with a numerical stability index based on the chemical composition. The chemical composition of the bio-oils studied was characterized using a solvent extraction scheme that describes the composition of bio-oil as a blend of three macro fractions: C1-C6 oxygenated molecules (named co-solvents), water-insoluble molecules, and water-soluble polar molecules (including water but excluding the co-solvents), e.g., anhydrosugars. The results show that the required amount of co-solvent to dissolve both fractions and keep the bio-oil homogeneous varies depending upon the chemical composition. The minimum amount of co-solvent for homogeneous bio-oils was observed to be from 15 to 30 wt {\%}. The correlation between the chemical composition and homogeneity of fresh and aged bio-oils is shown in ternary-phase diagrams. Addition experiments were made with model compounds to cover a larger part of the phase diagram.",
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Oasmaa, A, Sundqvist, T, Kuoppala, E, Garcia-Perez, M, Solantausta, Y, Lindfors, C & Paasikallio, V 2015, 'Controlling the phase stability of biomass fast pyrolysis bio-oils', Energy & Fuels, vol. 29, no. 7, pp. 4373-4381. https://doi.org/10.1021/acs.energyfuels.5b00607

Controlling the phase stability of biomass fast pyrolysis bio-oils. / Oasmaa, Anja (Corresponding Author); Sundqvist, Tom; Kuoppala, Eeva; Garcia-Perez, Manuel; Solantausta, Yrjö; Lindfors, Christian; Paasikallio, Ville.

In: Energy & Fuels, Vol. 29, No. 7, 2015, p. 4373-4381.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - Controlling the phase stability of biomass fast pyrolysis bio-oils

AU - Oasmaa, Anja

AU - Sundqvist, Tom

AU - Kuoppala, Eeva

AU - Garcia-Perez, Manuel

AU - Solantausta, Yrjö

AU - Lindfors, Christian

AU - Paasikallio, Ville

PY - 2015

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N2 - Fast pyrolysis bio-oil oil is a promising alternative to fossil fuels and is currently entering the heating oil market. However, there is a lack of available information about the phase stability of bio-oil. The water-soluble and water-insoluble compounds in bio-oil can either be in one homogeneous phase or form two individual phases, to which we refer to as phase separation. Phase separation can occur immediately after condensation of the pyrolysis vapors to bio-oil because of certain pyrolysis conditions or type of raw material or after years of aging because of changes in composition caused by repolymerization reactions. We present how the phase separation of bio-oils is related to the chemical composition and show that the probability of phase separation can be predicted with a numerical stability index based on the chemical composition. The chemical composition of the bio-oils studied was characterized using a solvent extraction scheme that describes the composition of bio-oil as a blend of three macro fractions: C1-C6 oxygenated molecules (named co-solvents), water-insoluble molecules, and water-soluble polar molecules (including water but excluding the co-solvents), e.g., anhydrosugars. The results show that the required amount of co-solvent to dissolve both fractions and keep the bio-oil homogeneous varies depending upon the chemical composition. The minimum amount of co-solvent for homogeneous bio-oils was observed to be from 15 to 30 wt %. The correlation between the chemical composition and homogeneity of fresh and aged bio-oils is shown in ternary-phase diagrams. Addition experiments were made with model compounds to cover a larger part of the phase diagram.

AB - Fast pyrolysis bio-oil oil is a promising alternative to fossil fuels and is currently entering the heating oil market. However, there is a lack of available information about the phase stability of bio-oil. The water-soluble and water-insoluble compounds in bio-oil can either be in one homogeneous phase or form two individual phases, to which we refer to as phase separation. Phase separation can occur immediately after condensation of the pyrolysis vapors to bio-oil because of certain pyrolysis conditions or type of raw material or after years of aging because of changes in composition caused by repolymerization reactions. We present how the phase separation of bio-oils is related to the chemical composition and show that the probability of phase separation can be predicted with a numerical stability index based on the chemical composition. The chemical composition of the bio-oils studied was characterized using a solvent extraction scheme that describes the composition of bio-oil as a blend of three macro fractions: C1-C6 oxygenated molecules (named co-solvents), water-insoluble molecules, and water-soluble polar molecules (including water but excluding the co-solvents), e.g., anhydrosugars. The results show that the required amount of co-solvent to dissolve both fractions and keep the bio-oil homogeneous varies depending upon the chemical composition. The minimum amount of co-solvent for homogeneous bio-oils was observed to be from 15 to 30 wt %. The correlation between the chemical composition and homogeneity of fresh and aged bio-oils is shown in ternary-phase diagrams. Addition experiments were made with model compounds to cover a larger part of the phase diagram.

U2 - 10.1021/acs.energyfuels.5b00607

DO - 10.1021/acs.energyfuels.5b00607

M3 - Article

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EP - 4381

JO - Energy & Fuels

JF - Energy & Fuels

SN - 0887-0624

IS - 7

ER -