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:
Oct. 31, 1989
Filed:
Sep. 06, 1988
Applicant:
Inventors:
Jean-Bernard Leleu, Lestrem, FR;
Patrick LeMay, Lestrem, FR;
Assignee:
Roquette Freres, Lestrem, FR;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C07D / ;
U.S. Cl.
CPC ...
549292 ;
Abstract
A gluconic acid syrup is introduced into a first crystallization zone 1a which it is brought to traverse under stirring and inside which it is maintained at a constant temperature, the mixture syrup and the gluconodeltalactone crystals emerging from this first zone being brought to traverse a second crystallization zone 1b within which it is subjected firstly to a temperature gradient decreasing globally, possibly modulated then to a substantially constant temperature, the mixture emerging from this second zone being in the form of a crystalline mass rich in gluconodeltalactone crystals from which the latter are recovered.