Pyrolysis oil multiphase behavior and phase stability: A review

Anja Oasmaa, Isabel Fonts, Manuel Raul Pelaez-Samaniego, Martha Estrella Garcia-Perez, Manuel Garcia-Perez (Corresponding Author)

Research output: Contribution to journalReview ArticleScientificpeer-review

46 Citations (Scopus)

Abstract

This paper reviews the literature related to the complex chemical composition and multiphase nature of bio-oils and their practical implications. Over time, bio-oil forms separated phases due to purely physical phenomena (phase stability) or chemical composition changes in storage (aging reactions). Bio-oil multiphase behavior and the formation of separated phases are controlled by the complex chemical composition of these oils. Fast pyrolysis oils from woody biomass are typically observed in a single phase. However, feedstocks with high extractives content and/or high ash content commonly produce oils with more than one phase (an aqueous phase, an upper layer, and a decanted heavy oily phase). The first part of this Review focuses on the effects of feedstock composition, particle size, type of pyrolysis reactor, and condensation systems on bio-oil chemical composition and their impact on stable oils production. The second section reviews our current understanding of fresh bio-oil multiphase behavior and the effect of aging reactions. The use of phase diagrams as a tool to predict bio-oil phase stability is discussed. The third section focuses on bio-oil upgrading strategies based on the use of solvents and the production of emulsions. In this section we discuss the factors affecting phase equilibrium. This review highlights the importance of developing systematic studies to better understand bio-oil liquid-liquid phase equilibrium and the advantages of using phase diagrams. This understanding could have significant impact on the development of new bio-oil separation processes, on the development of new tools to produce stable bio-oils, as well as on the production of bio-oil-derived fuels. Understanding the complex nature of bio-oil multiphase behavior has been progressing over the years; however, more work is still needed to control these phenomena.
Original languageEnglish
Pages (from-to)6179-6200
JournalEnergy & Fuels
Volume30
Issue number8
DOIs
Publication statusPublished - 2016
MoE publication typeA2 Review article in a scientific journal

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Phase stability
Oils
Pyrolysis
Chemical analysis
Ashes
Phase equilibria
Feedstocks
Phase diagrams
Aging of materials
Liquids
Emulsions

Cite this

Oasmaa, A., Fonts, I., Pelaez-Samaniego, M. R., Garcia-Perez, M. E., & Garcia-Perez, M. (2016). Pyrolysis oil multiphase behavior and phase stability: A review. Energy & Fuels, 30(8), 6179-6200. https://doi.org/10.1021/acs.energyfuels.6b01287
Oasmaa, Anja ; Fonts, Isabel ; Pelaez-Samaniego, Manuel Raul ; Garcia-Perez, Martha Estrella ; Garcia-Perez, Manuel. / Pyrolysis oil multiphase behavior and phase stability: A review. In: Energy & Fuels. 2016 ; Vol. 30, No. 8. pp. 6179-6200.
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Oasmaa, A, Fonts, I, Pelaez-Samaniego, MR, Garcia-Perez, ME & Garcia-Perez, M 2016, 'Pyrolysis oil multiphase behavior and phase stability: A review', Energy & Fuels, vol. 30, no. 8, pp. 6179-6200. https://doi.org/10.1021/acs.energyfuels.6b01287

Pyrolysis oil multiphase behavior and phase stability: A review. / Oasmaa, Anja; Fonts, Isabel; Pelaez-Samaniego, Manuel Raul; Garcia-Perez, Martha Estrella; Garcia-Perez, Manuel (Corresponding Author).

In: Energy & Fuels, Vol. 30, No. 8, 2016, p. 6179-6200.

Research output: Contribution to journalReview ArticleScientificpeer-review

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AU - Oasmaa, Anja

AU - Fonts, Isabel

AU - Pelaez-Samaniego, Manuel Raul

AU - Garcia-Perez, Martha Estrella

AU - Garcia-Perez, Manuel

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N2 - This paper reviews the literature related to the complex chemical composition and multiphase nature of bio-oils and their practical implications. Over time, bio-oil forms separated phases due to purely physical phenomena (phase stability) or chemical composition changes in storage (aging reactions). Bio-oil multiphase behavior and the formation of separated phases are controlled by the complex chemical composition of these oils. Fast pyrolysis oils from woody biomass are typically observed in a single phase. However, feedstocks with high extractives content and/or high ash content commonly produce oils with more than one phase (an aqueous phase, an upper layer, and a decanted heavy oily phase). The first part of this Review focuses on the effects of feedstock composition, particle size, type of pyrolysis reactor, and condensation systems on bio-oil chemical composition and their impact on stable oils production. The second section reviews our current understanding of fresh bio-oil multiphase behavior and the effect of aging reactions. The use of phase diagrams as a tool to predict bio-oil phase stability is discussed. The third section focuses on bio-oil upgrading strategies based on the use of solvents and the production of emulsions. In this section we discuss the factors affecting phase equilibrium. This review highlights the importance of developing systematic studies to better understand bio-oil liquid-liquid phase equilibrium and the advantages of using phase diagrams. This understanding could have significant impact on the development of new bio-oil separation processes, on the development of new tools to produce stable bio-oils, as well as on the production of bio-oil-derived fuels. Understanding the complex nature of bio-oil multiphase behavior has been progressing over the years; however, more work is still needed to control these phenomena.

AB - This paper reviews the literature related to the complex chemical composition and multiphase nature of bio-oils and their practical implications. Over time, bio-oil forms separated phases due to purely physical phenomena (phase stability) or chemical composition changes in storage (aging reactions). Bio-oil multiphase behavior and the formation of separated phases are controlled by the complex chemical composition of these oils. Fast pyrolysis oils from woody biomass are typically observed in a single phase. However, feedstocks with high extractives content and/or high ash content commonly produce oils with more than one phase (an aqueous phase, an upper layer, and a decanted heavy oily phase). The first part of this Review focuses on the effects of feedstock composition, particle size, type of pyrolysis reactor, and condensation systems on bio-oil chemical composition and their impact on stable oils production. The second section reviews our current understanding of fresh bio-oil multiphase behavior and the effect of aging reactions. The use of phase diagrams as a tool to predict bio-oil phase stability is discussed. The third section focuses on bio-oil upgrading strategies based on the use of solvents and the production of emulsions. In this section we discuss the factors affecting phase equilibrium. This review highlights the importance of developing systematic studies to better understand bio-oil liquid-liquid phase equilibrium and the advantages of using phase diagrams. This understanding could have significant impact on the development of new bio-oil separation processes, on the development of new tools to produce stable bio-oils, as well as on the production of bio-oil-derived fuels. Understanding the complex nature of bio-oil multiphase behavior has been progressing over the years; however, more work is still needed to control these phenomena.

U2 - 10.1021/acs.energyfuels.6b01287

DO - 10.1021/acs.energyfuels.6b01287

M3 - Review Article

VL - 30

SP - 6179

EP - 6200

JO - Energy & Fuels

JF - Energy & Fuels

SN - 0887-0624

IS - 8

ER -

Oasmaa A, Fonts I, Pelaez-Samaniego MR, Garcia-Perez ME, Garcia-Perez M. Pyrolysis oil multiphase behavior and phase stability: A review. Energy & Fuels. 2016;30(8):6179-6200. https://doi.org/10.1021/acs.energyfuels.6b01287