Process for the synthesis of glycolonitrile

Details Process for the synthesis of glycolonitrile Process for the synthesis of glycolonitrile

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.

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