Liquefaction of lignocellulose: process parameter study to minimize heavy ends

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

Research output: Contribution to journalArticleAcademicpeer-review

21 Citations (Scopus)
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Abstract

Lignocellulosic feedstock can be converted to bio-oil by direct liquefaction in a phenolic solvent such as guaiacol with an oil yield of >90 C% at 300–350 °C without the assistance of catalyst or reactive atmosphere. Despite good initial performance, the liquefaction was rapidly hindered by the formation of heavy components (molecular weight > 1000 Da), which increased the viscosity of the bio-oil upon recycling the bio-oil or a fraction of it as a liquefaction solvent. This paper explores the possibility to minimize the production of this undesirably heavy fraction by optimizing the process parameters such as temperature, heating rate, reaction time, and concentration of water. This study allowed us to find a compromise between maximizing the bio-oil yield and minimizing its heavy fraction. It also provides insight onto the reaction network of the liquefaction reaction, showing for instance that all product fractions, including the heaviest products and the char, are mainly direct liquefaction products rather than secondary reaction products, e.g. from bio-oil recondensation. However, the resulting heavy fraction is still too high to allow effective recycling of the bio-oil. Complementary approaches need to be investigated
Original languageEnglish
Pages (from-to)11668-116676
Number of pages9
JournalIndustrial and engineering chemistry research
Volume53
Issue number29
DOIs
Publication statusPublished - 2014

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Liquefaction
Oils
Recycling
Guaiacol
lignocellulose
Heating rate
Reaction products
Feedstocks
Molecular weight
Viscosity
Catalysts
Water

Keywords

  • IR-94919
  • METIS-305357

Cite this

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title = "Liquefaction of lignocellulose: process parameter study to minimize heavy ends",
abstract = "Lignocellulosic feedstock can be converted to bio-oil by direct liquefaction in a phenolic solvent such as guaiacol with an oil yield of >90 C{\%} at 300–350 °C without the assistance of catalyst or reactive atmosphere. Despite good initial performance, the liquefaction was rapidly hindered by the formation of heavy components (molecular weight > 1000 Da), which increased the viscosity of the bio-oil upon recycling the bio-oil or a fraction of it as a liquefaction solvent. This paper explores the possibility to minimize the production of this undesirably heavy fraction by optimizing the process parameters such as temperature, heating rate, reaction time, and concentration of water. This study allowed us to find a compromise between maximizing the bio-oil yield and minimizing its heavy fraction. It also provides insight onto the reaction network of the liquefaction reaction, showing for instance that all product fractions, including the heaviest products and the char, are mainly direct liquefaction products rather than secondary reaction products, e.g. from bio-oil recondensation. However, the resulting heavy fraction is still too high to allow effective recycling of the bio-oil. Complementary approaches need to be investigated",
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Liquefaction of lignocellulose: process parameter study to minimize heavy ends. / Kumar, S.; Lange, Jean Paul; van Rossum, G.; Kersten, Sascha R.A.

In: Industrial and engineering chemistry research, Vol. 53, No. 29, 2014, p. 11668-116676.

Research output: Contribution to journalArticleAcademicpeer-review

TY - JOUR

T1 - Liquefaction of lignocellulose: process parameter study to minimize heavy ends

AU - Kumar, S.

AU - Lange, Jean Paul

AU - van Rossum, G.

AU - Kersten, Sascha R.A.

PY - 2014

Y1 - 2014

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AB - Lignocellulosic feedstock can be converted to bio-oil by direct liquefaction in a phenolic solvent such as guaiacol with an oil yield of >90 C% at 300–350 °C without the assistance of catalyst or reactive atmosphere. Despite good initial performance, the liquefaction was rapidly hindered by the formation of heavy components (molecular weight > 1000 Da), which increased the viscosity of the bio-oil upon recycling the bio-oil or a fraction of it as a liquefaction solvent. This paper explores the possibility to minimize the production of this undesirably heavy fraction by optimizing the process parameters such as temperature, heating rate, reaction time, and concentration of water. This study allowed us to find a compromise between maximizing the bio-oil yield and minimizing its heavy fraction. It also provides insight onto the reaction network of the liquefaction reaction, showing for instance that all product fractions, including the heaviest products and the char, are mainly direct liquefaction products rather than secondary reaction products, e.g. from bio-oil recondensation. However, the resulting heavy fraction is still too high to allow effective recycling of the bio-oil. Complementary approaches need to be investigated

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