The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 08, 2020
Filed:
Jan. 07, 2020
Far Eastern New Century Corporation, Taipei, TW;
FAR EASTERN NEW CENTURY CORPORATION, Taipei, TW;
Abstract
A method for purifying a crude 2,5-furandicarboxylic acid composition including 2,5-furandicarboxylic acid and 5-formylfuran-2-carboxylic acid is disclosed. The method includes the steps of: (a) subjecting the crude 2,5-furandicarboxylic acid composition to complete dissolution in a solvent solution to obtain a mixture, the solvent solution including an organic solvent and water; (b) subjecting 5-formylfuran-2-carboxylic acid in the mixture to an addition reaction with sodium hydrogen sulfite to obtain an addition product; and (c) subjecting 2,5-furandicarboxylic acid to precipitation after step (b) to obtain purified 2,5-furandicarboxylic acid.