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US 11,814,790 B2Granted
Multi-step process for the isolation of components from Miscanthus
AssigneeExegi IP Management B.V.
InventorMarcel Van De Peppel
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Abstract
The invention relates to a process for the isolation of components from plant material of Miscanthus. The process comprises three subsequent extractions. The first extraction yields an extract comprising one or more compounds selected from the group of antioxidants, polyphenols, proteins, sterols, acids, alcohols, ketones, aldehydes and aromatic compounds. Thereafter, the plant material is subjected to two extractions with a metal hydroxide (e.g. NaOH), the first performed at a lower pH than the second. These steps yield a sugar fraction and a Iignin fraction, respectively. Finally, from the residue after the third extraction, cellulose is isolated.
Claims25
A process for the isolation of components from plant material of Miscanthus, the process comprising:
- (i) providing plant material of Miscanthus;
- then
- (ii) subjecting the plant material to an extraction with a first extraction solvent to yield a first residue and a first extract, wherein
- (iia) the first extraction solvent is a solvent mixture of water with at least 30 wt. % of at least one alcohol dissolved in the water, and
- (iib) the first extract comprises one or more compounds selected from the group consisting of antioxidants, polyphenols, proteins, sterols, acids, alcohols, ketones, aldehydes and aromatic compounds;
- then
- (iii) subjecting the first residue to an extraction with a second extraction solvent to yield a second residue and a second extract, wherein
- (iiia) the second extraction solvent comprises an aqueous solution of at least one metal hydroxide selected from the group consisting of LiOH, NaOH and KOH, wherein the at least one metal hydroxide is present in the second extraction solvent in a total concentration of 0.15-1.50 M;
- and
- (iiib) the second extract comprises a plurality of sugars;
- then
- (iv) subjecting the second residue to an extraction with a third extraction solvent to yield a third residue and a third extract, wherein
- (iva) the third extraction solvent comprises an aqueous solution of at least one metal hydroxide selected from the group consisting of LiOH, NaOH and KOH, wherein the at least one metal hydroxide is present in the third extraction solvent in a total concentration of at least 2.5 M;
- (ivb) the third extract comprises lignin;
- and
- (ivc) the third residue comprises cellulose.
13 more elements
A process for the isolation of components from plant material of Miscanthus, the process comprising:
- (i) providing plant material of Miscanthus;
- then
- (ii) subjecting the plant material to an extraction with a first extraction solvent to yield a first residue and a first extract, wherein
- (iia) the first extraction solvent is a solvent mixture of water with at least 30 wt. % of at least one alcohol dissolved in the water, and
- (iib) the first extract comprises one or more compounds selected from the group consisting of antioxidants, polyphenols, proteins, sterols, acids, alcohols, ketones, aldehydes and aromatic compounds;
- then
- (iii) subjecting the first residue to an extraction with a second extraction solvent to yield a second residue and a second extract, wherein
- (iiia) the second extraction solvent comprises an aqueous solution of at least one metal hydroxide selected from the group consisting of LiOH, NaOH and KOH, wherein the at least one metal hydroxide is present in the second extraction solvent in a total concentration of 0.15-1.50 M;
- and
- (iiib) the second extract comprises a plurality of sugars;
- then
- (iv) subjecting the second residue to an extraction with a third extraction solvent to yield a third residue and a third extract, wherein
- (iva) the third extraction solvent comprises an aqueous solution of at least one metal hydroxide selected from the group consisting of LiOH, NaOH and KOH, wherein the at least one metal hydroxide is present in the third extraction solvent in a total concentration of at least 2.5 M;
- (ivb) the third extract comprises lignin;
- and
- (ivc) the third residue comprises cellulose, and
- (v) the process further comprises subjecting the second extract to a treatment to regenerate the second extraction solvent therefrom by the sequential steps of:
- a) adding CO2 to the second extract to reach a pH in the range of 6-11;
- b) separating the composition resulting from step a) into a first fraction containing sugars and a second fraction containing an aqueous metal carbonate solution;
- c) adding CaO and/or Ca(OH)2 to the second fraction to generate precipitated CaCO3 and thereby regenerate the second extraction solvent;
- d) burning the precipitated CaCO3 to regenerate CO2 and CaO;
- and
- then e) using the regenerated CO2 in step a) and/or using the regenerated CaO in step c).
20 more elements
A process for the isolation of components from plant material of Miscanthus, the process comprising:
- (i) providing plant material of Miscanthus;
- then
- (ii) subjecting the plant material to an extraction with a first extraction solvent to yield a first residue and a first extract, wherein
- (iia) the first extraction solvent is a solvent mixture of water with at least 30 wt. % of at least one alcohol dissolved in the water, and
- (iib) the first extract comprises one or more compounds selected from the group consisting of antioxidants, polyphenols, proteins, sterols, acids, alcohols, ketones, aldehydes and aromatic compounds;
- then
- (iii) subjecting the first residue to an extraction with a second extraction solvent to yield a second residue and a second extract, wherein
- (iiia) the second extraction solvent comprises an aqueous solution of at least one metal hydroxide selected from the group consisting of LiOH, NaOH and KOH, wherein the at least one metal hydroxide is present in the second extraction solvent in a total concentration of 0.15-1.50 M;
- and
- (iiib) the second extract comprises a plurality of sugars;
- then
- (iv) subjecting the second residue to an extraction with a third extraction solvent to yield a third residue and a third extract, wherein
- (iva) the third extraction solvent comprises an aqueous solution of at least one metal hydroxide selected from the group consisting of LiOH, NaOH and KOH, wherein the at least one metal hydroxide is present in the third extraction solvent in a total concentration of at least 2.5 M;
- (ivb) the third extract comprises lignin;
- and
- (ivc) the third residue comprises cellulose, and
- (v) the process further comprises subjecting the third extract to a treatment to regenerate the third extraction solvent therefrom by the sequential steps of:
- a) adding CO2 to the third extract to precipitate the lignin therefrom and create a supernatant containing an aqueous metal carbonate solution;
- b) separating the lignin from the supernatant;
- c) adding CaO and/or Ca(OH)2 to the supernatant to generate precipitated CaCO3 and thereby regenerate the third extraction solvent;
- d) burning the precipitated CaCO3 to generate CO2 and CaO;
- and then
- e) using the regenerated CO2 in step a) and/or using the regenerated CaO in step c).
20 more elements
Dependencies are inferred from the claim text.