Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Processes of preparing a desired or intentional composition...
Reexamination Certificate
2008-05-06
2008-05-06
Witherspoon, Sikarl A. (Department: 1621)
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Processes of preparing a desired or intentional composition...
C556S174000
Reexamination Certificate
active
11314386
ABSTRACT:
A process to prepare substantially pure glycolonitrile in an aqueous medium is provided by reacting hydrogen cyanide and formaldehyde. The formaldehyde feed stream is heated prior to reacting with hydrogen cyanide, resulting in an aqueous glycolonitrile solution with fewer impurities, especially less unreacted formaldehyde, than is obtained by other methods. The process enables production of an aqueous glycolonitrile solution that requires less post-reaction purification (if any at all) prior to enzymatically converting the glycolonitrile into glycolic acid.
REFERENCES:
patent: 2175605 (1939-10-01), Jacobson
patent: 2175805 (1939-10-01), Jacobson
patent: 2890238 (1959-06-01), Sexton
patent: 5187301 (1993-02-01), Cullen et al.
patent: 5208363 (1993-05-01), Crump et al.
patent: 5508181 (1996-04-01), Hashimoto
patent: 5756306 (1998-05-01), Yamaguchi et al.
patent: 5817613 (1998-10-01), Athey et al.
patent: 6037155 (2000-03-01), Kobayashi et al.
patent: 6759549 (2004-07-01), Stern et al.
patent: 2003/0040085 (2003-02-01), Aoki et al.
patent: 1 575 475 (1969-07-01), None
patent: 2003192655 (2003-07-01), None
Foo Thomas
Panova Anna
E. I. du Pont de Nemours and Company
Lhulier Christine M.
Nwaonicha Chukwuma O.
Witherspoon Sikarl A.
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