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1. (WO1980002423) PROCEDE AMELIORE DE FABRICATION D"ACIDE ET D"ESTERS LEVULINIQUES
Note: Texte fondé sur des processus automatiques de reconnaissance optique de caractères. Seule la version PDF a une valeur juridique

CLAIMS
1. In the process for the manufacture of a levulinic acid ester which comprises the esterification of furfuryl alcohol with a different alcohol selected from the group consisting of an unsubstituted primary and secondary carbon-chain and carbon-ring alcohols in the presence of a strong acid catalyst, the improvement comprising purification of the crude levulinate ester by vacuum distillation of said levulinate in admixture wit at least 3 percent by volume of the levulinate of a solvent which a) has the boiling point of at least 20°C higher than the boiling point of the levulinate ester, b) dissolves the tar and c) is miscible with the levulinate ester.
2. A process of Claim 1 wherein the difference between the boiling point of the levulinate ester and the boiling point of the solvent is at least 50°C.
3. A process of Claim 1 wherein said solvent is selected from the group consisting of triacetin, dimethyl phthalate, di-n-butyl phthalate and diethyl phthalate.
4. A process of Claim 3 wherein furfuryl alcohol is esterified with an aliphatic alcohol.
5. A process of Claim 3 wherein the solvent is used in the amount of from 4 to 10% by volume of the crude levulinate ester.
6. A process of Claim 1 wherein furfuryl alcohol is esterified with n-butanol and the solvent is di-n-butyl phthalate.
7. A process of Claim 1 wherein the distilled levulinate ester is hydrolyzed to yield pure levulinic acid.
8. A process of Claim 5 wherein the distilled levulinate ester is hydrolyzed to yield pure levulinic acid.