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:
Aug. 30, 2011
Filed:
Aug. 12, 2008
Robert Dicosimo, Chadds Ford, PA (US);
Anna Panova, Hockessin, DE (US);
Jeffery Scott Thompson, West Chester, PA (US);
Robert D. Fallon, Elkton, MD (US);
F. Glenn Gallagher, Wilmington, DE (US);
Thomas Foo, Wilmington, DE (US);
Xu LI, Newark, DE (US);
George C. Fox, Wilmington, DE (US);
Joseph J. Zaher, Newark, DE (US);
Mark S. Payne, Wilmington, DE (US);
Daniel P. O'keefe, Ridley Park, PA (US);
Robert DiCosimo, Chadds Ford, PA (US);
Anna Panova, Hockessin, DE (US);
Jeffery Scott Thompson, West Chester, PA (US);
Robert D. Fallon, Elkton, MD (US);
F. Glenn Gallagher, Wilmington, DE (US);
Thomas Foo, Wilmington, DE (US);
Xu Li, Newark, DE (US);
George C. Fox, Wilmington, DE (US);
Joseph J. Zaher, Newark, DE (US);
Mark S. Payne, Wilmington, DE (US);
Daniel P. O'Keefe, Ridley Park, PA (US);
E.I. du Pont de Nemours and Company, Wilmington, DE (US);
Abstract
A process is provided for producing glycolic acid from formaldehyde and hydrogen cyanide. More specifically, heat-treated formaldehyde and hydrogen cyanide are reacted to produce glycolonitrile having low concentrations of impurities. The glycolonitrile is subsequently converted to an aqueous solution of ammonium glycolate using an enzyme catalyst having nitrilase activity derived from72W (ATCC 57746). Glycolic acid is recovered in the form of the acid or salt from the aqueous ammonium glycolate solution using a variety of methods described herein.