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. 21, 2008
Filed:
Oct. 11, 2007
Applicants:
F. Glenn Gallagher, Wilmington, DE (US);
Rod K. Hackman, Charleston, WV (US);
Daniel Albert Green, Moylan, PA (US);
Inventors:
F. Glenn Gallagher, Wilmington, DE (US);
Rod K. Hackman, Charleston, WV (US);
Daniel Albert Green, Moylan, PA (US);
Assignee:
E.I. du Pont de Nemours and Company, Wilmington, DE (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C07C 51/43 (2006.01);
U.S. Cl.
CPC ...
Abstract
The present invention relates to a high yield process to prepare high purity crystalline glycolic acid using a multi-loop crystallization process characterized by high liquid and/or solid recycle, said process suitable for large scale purification and producing high purity glycolic acid with low diglycolic acid content.