Ionic liquid pretreatment of lignocellulosic biomass with ionic liquid–water mixtures

Ground lignocellulosic biomass (Miscanthus giganteus, pine (Pinus sylvestris) and willow (Salix viminalis)) was pretreated with ionic liquid–water mixtures of 1-butyl-3-methylimidazolium methyl sulfate and 1-butyl-3-methylimidazolium hydrogen sulfate. A solid fraction enriched in cellulose was recovered, which was subjected to enzymatic hydrolysis. Up to 90% of the glucose and 25% of the hemicellulose contained in the original biomass were released by the combined ionic liquid pretreatment and the enzymatic hydrolysis. After the pretreatment, the ionic liquid liquor contained the majority of the lignin and the hemicellulose. The lignin portion was partially precipitated from the liquor upon dilution with water. The amount of hemicellulose monomers in the ionic liquid liquor and their conversion into furfurals was also examined. The performance of ionic liquid–water mixtures containing 1,3-dialkylimidazolium ionic liquids with acetate, methanesulfonate, trifluoromethanesulfonate and chloride anions was investigated. The applicability of the ionic liquid 1-butylimidazolium hydrogensulfate for lignocellulose pretreatment was also examined. It was found that ionic liquid liquors containing methyl sulfate, hydrogen sulfate and methanesulfonate anions were most effective in terms of lignin/cellulose fractionation and enhancement of cellulose digestibility.

• Publication year

  2011

• Venue

  Green Chemistry

• Publication date

  2011-08-30

• Fields of study

  Materials Science, Chemistry, Environmental Science

• Identifiers
  DOI 10.1039/C1GC15374A
• External record

  Open on Semantic Scholar

• Source metadata

  Semantic Scholar

• Ionic liquid liquors with methyl sulfate, hydrogen sulfate, and methanesulfonate anions were the most effective for lignin/cellulose fractionation and cellulose digestibility enhancement.

  Confidence 0.92

  박진우 (dztg5apj7m) extraction뀨 (7c402c1b98) reviewAK (4715169a40) reviewB (s683577b42) reviewq (76h6bfydm6) reviewKiller Whale (322360f1c1) reviewAnonymous (12632b8b5f) review
• Most of the lignin and hemicellulose partitioned into the ionic liquid liquor after pretreatment, and some of the lignin precipitated when the liquor was diluted with water.

  Confidence 0.95

  박진우 (dztg5apj7m) extraction뀨 (7c402c1b98) reviewAK (4715169a40) reviewB (s683577b42) reviewq (76h6bfydm6) reviewKiller Whale (322360f1c1) reviewAnonymous (12632b8b5f) review
• Ionic liquid pretreatment followed by enzymatic hydrolysis released up to 90% of the glucose and 25% of the hemicellulose in the original biomass.

  Confidence 0.98

  박진우 (dztg5apj7m) extraction뀨 (7c402c1b98) reviewAK (4715169a40) reviewB (s683577b42) reviewq (76h6bfydm6) reviewKiller Whale (322360f1c1) reviewAnonymous (12632b8b5f) review

• cellulose digestibility

  property

  The ease with which the pretreated cellulose-rich solid fraction can be converted by enzymes.

  Aliases: digestibility of cellulose

  박진우 (dztg5apj7m) extraction뀨 (7c402c1b98) reviewAK (4715169a40) reviewB (s683577b42) reviewq (76h6bfydm6) reviewKiller Whale (322360f1c1) reviewAnonymous (12632b8b5f) review
• enzymatic hydrolysis

  process

  An enzyme-driven step used to convert the cellulose-rich solid fraction into soluble sugars.

  Aliases: enzyme hydrolysis

  박진우 (dztg5apj7m) extraction뀨 (7c402c1b98) reviewAK (4715169a40) reviewB (s683577b42) reviewq (76h6bfydm6) reviewKiller Whale (322360f1c1) reviewAnonymous (12632b8b5f) review
• glucose

  molecule

  The six-carbon sugar measured as a product released from the cellulose-rich solid fraction.

  박진우 (dztg5apj7m) extraction뀨 (7c402c1b98) reviewAK (4715169a40) reviewB (s683577b42) reviewq (76h6bfydm6) reviewKiller Whale (322360f1c1) reviewAnonymous (12632b8b5f) review
• hemicellulose

  biopolymer

  The heteropolysaccharide fraction of lignocellulosic biomass present in the feedstocks and pretreatment fractions.

  박진우 (dztg5apj7m) extraction뀨 (7c402c1b98) reviewAK (4715169a40) reviewB (s683577b42) reviewq (76h6bfydm6) reviewKiller Whale (322360f1c1) reviewAnonymous (12632b8b5f) review
• ionic liquid anion

  chemical component

  The anionic component of the ionic liquids tested in the pretreatment mixtures.

  Aliases: anion

  박진우 (dztg5apj7m) extraction뀨 (7c402c1b98) reviewAK (4715169a40) reviewB (s683577b42) reviewq (76h6bfydm6) reviewKiller Whale (322360f1c1) reviewAnonymous (12632b8b5f) review
• ionic liquid liquor

  material

  The liquid phase remaining after pretreatment that contains dissolved biomass components.

  Aliases: pretreatment liquor, IL liquor

  박진우 (dztg5apj7m) extraction뀨 (7c402c1b98) reviewAK (4715169a40) reviewB (s683577b42) reviewq (76h6bfydm6) reviewKiller Whale (322360f1c1) reviewAnonymous (12632b8b5f) review
• ionic liquid pretreatment

  process

  A biomass processing step that treats ground lignocellulosic feedstock with ionic liquid–water mixtures before separation.

  Aliases: IL pretreatment, ionic liquid–water pretreatment

  박진우 (dztg5apj7m) extraction뀨 (7c402c1b98) reviewAK (4715169a40) reviewB (s683577b42) reviewq (76h6bfydm6) reviewKiller Whale (322360f1c1) reviewAnonymous (12632b8b5f) review
• lignin

  biopolymer

  The aromatic polymer component of lignocellulosic biomass that is part of the pretreatment fractions discussed here.

  박진우 (dztg5apj7m) extraction뀨 (7c402c1b98) reviewAK (4715169a40) reviewB (s683577b42) reviewq (76h6bfydm6) reviewKiller Whale (322360f1c1) reviewAnonymous (12632b8b5f) review

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