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:
Apr. 13, 2021
Filed:
Jan. 24, 2019
Applicant:
T. Hasegawa Co., Ltd., Tokyo, JP;
Inventors:
Assignee:
T. Hasegawa Co., Ltd, Tokyo, JP;
Primary Examiner:
Int. Cl.
CPC ...
C07C 45/83 (2006.01); C07C 47/58 (2006.01);
U.S. Cl.
CPC ...
C07C 47/58 (2013.01); C07C 45/83 (2013.01);
Abstract
The present invention relates to a method for producing vanillin, including the steps of: (A) distilling a solution containing crude vanillin and an aliphatic dicarboxylic acid dialkyl ester to obtain a vanillin solution; and (B) subjecting the vanillin solution to anti-solvent crystallization. The method for producing vanillin according to the present invention enables production of high-purity vanillin with industrially sufficient efficiency without use of a special apparatus.