Levulinic acid compositions
A levulinic acid composition A having: a. at least 95 wt. % of levulinic acid; b. between 5 wppm and 5000 wppm of formic acid; and c. less than 1000 wppm of angelica lactone, based on the total weight of the composition. A process for the isolation of a levulinic acid composition, having the following steps: a. performing acid catalyzed hydrolysis of a C6 carbohydrate-containing feedstock to obtain reaction product X, b. subjecting of reaction product X to solid-liquid separation to provide a composition 1, c. feeding composition 1 to at least two purification steps to treat composition 1 to obtain a levulinic acid composition, wherein a second or a further purification step is a melt crystallization step.
1. A levulinic acid composition A, comprising:
at least 98 wt. % of levulinic acid;
between 5 wppm and 5000 wppm of formic acid; and
less than 1000 wppm of angelica lactone, based on the total weight of the composition, and
when the amounts of levulinic acid, formic acid and angelica lactone in the composition are less than 98.6 wt. %, based on the total weight of the composition, the balance of the composition is solvent; and
wherein the levulinic acid composition A is obtained by purification through melt crystallization.
2. The composition according to claim 1 , wherein the amount of levulinic acid is at least 99 wt. %, based on the total weight of the composition.
3. The composition according to claim 1 , wherein the amount of formic acid is between 10 wppm and 1000 wppm, based on the total weight of the composition.
4. The composition according to claim 1 , wherein the amount of formic acid is between 20 wppm and 500 wppm, based on the total weight of the composition.
5. The composition according to claim 1 , wherein the amount of angelica lactone is 100 wppm.
6. The composition according to claim 1 , wherein the amount of angelica lactone is 10 wppm.
7. The composition according to claim 1 , wherein at least 90 wt. % of the formic acid that is present in the composition was not added from an external source.
8. A process for the isolation of the levulinic acid composition of claim 1 , comprising the following steps:
performing acid catalyzed hydrolysis of a C6 carbohydrate-containing feedstock to obtain reaction product X,
subjecting of reaction product X to solid-liquid separation to provide a composition 1,
feeding composition 1 to at least two purification steps to treat composition 1 to obtain a levulinic acid composition, wherein a second or a further purification step is a melt crystallization step.
9. The process according to claim 8 , wherein the process comprises 2-8 purification steps.
10. The process according to claim 8 , wherein a first purification step is chosen from a distillation step, an extraction step and/or an evaporation step.
11. The process according to claim 8 , wherein a first purification step is an evaporation step.
12. The process according to claim 8 , wherein the purification step comprises 1-3 evaporation steps in series followed by at least one melt crystallization step.
13. Use of a levulinic acid composition according to claim 1 , as a feedstock for a process for the production of methyltetrathydrofuran (MeTHF).
14. The composition according to claim 2 , wherein the amount of formic acid is between 10 wppm and 1000 wppm, based on the total weight of the composition, and wherein the amount of formic acid is between 20 wppm and 500 wppm, based on the total weight of the composition.
15. The composition according to claim 14 , wherein the amount of angelica lactone is 100 wppm, and wherein at least 90 wt. % of the formic acid that is present in the composition was not added from an external source.
16. The process according to claim 10 , wherein a first purification step is an evaporation step.
17. The process according to claim 16 , wherein the purification step comprises 1-3 evaporation steps in series followed by at least one melt crystallization step.