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US 11,535,582 B2Granted
Levulinic acid purification
AssigneeTéCnicas Reunidas, S.A.
InventorsVicente López Fernández, Lourdes Arribas Martínez, Maria Frades Tapia, Álvaro Ruiz Pérez
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Abstract
The present invention refers to a process for the purification of levulinic acid, an aqueous solution comprising levulinic acid and a process for the production of levulinic acid.
Claims19
A process for the purification of levulinic acid, comprising:
- i) providing an aqueous solution comprising levulinic acid;
- ii) subjecting the aqueous solution of step i) to an organic extraction to yield an organic solution and an aqueous solution;
- iii) subjecting the organic solution obtained in step ii) to an aqueous extraction to yield an aqueous solution, comprising levulinic acid, and an organic solution;
- and
- iv) subjecting the aqueous solution comprising levulinic acid obtained in step iii) to a membrane separation to yield an aqueous solution comprising levulinic acid, and a residue.
2 more elements
Process for the production of levulinic acid from pulped lignocellulosic biomass comprising the following steps:
- (i) providing pulped lignocellulosic biomass;
- (ii) optionally subjecting the pulped lignocellulosic biomass of step (i) to a pre-hydrolysis to obtain a pre-hydrolyzed pulped lignocellulosic biomass;
- (iii) subjecting the pulped lignocellulosic biomass provided in step (i) or the pre-hydrolyzed pulped lignocellulosic biomass obtained in step (ii) to an hydrolysis in the presence of an acid and under conditions of temperature, time, and acid concentration to yield an aqueous slurry comprising levulinic acid;
- (iv) subjecting the aqueous slurry obtained in step (iii) comprising levulinic acid to a solid-liquid separation yielding to an aqueous solution comprising levulinic acid and a solid;
- (v) subjecting the aqueous solution obtained in step (iv) to an organic extraction to yield an organic solution and an aqueous solution;
- (vi) subjecting the organic solution obtained in the previous step to an aqueous extraction to yield an aqueous solution, comprising levulinic acid, and an organic solution;
- (vii) subjecting the aqueous solution comprising levulinic acid obtained in step (vi) to a membrane separation to yield an aqueous solution comprising levulinic acid, and a residue;
- and
- (viii) optionally, subjecting the aqueous solution comprising levulinic acid obtained in the previous step to at least one further purification to yield an aqueous solution comprising levulinic acid.
6 more elements
Dependencies are inferred from the claim text.