Process for producing glycolide and glycolic acid oligomer...

Details Process for producing glycolide and glycolic acid oligomer... Process for producing glycolide and glycolic acid oligomer...

2007-06-13

2010-10-12

Gulakowski, Randy (Department: 1796)

Organic compounds -- part of the class 532-570 series

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

C524S765000, C524S766000, C525S450000, C560S185000

Reexamination Certificate

active

07812181

ABSTRACT:
Glycolide production through depolymerization of glycolic acid oligomer is stabilized by controlling impurities in the glycolic acid oligomer to allow economical and effective production of glycolide. More specifically, the depolymerization system is controlled to suppress an effective concentration (x+100y wt. %) of depolymerization-obstructing substances calculated as a total of a concentration calculated as diglycolic acid (of x wt. %) of hydroxyl group-free impurity carboxylic acids (A) and 100 times a concentration calculated as ammonia (of y wt. %) of nitrogen-containing substances (B), respectively with respect to the starting glycolic acid oligomer in the depolymerization system, to at most 15 wt. %.

REFERENCES:
patent: 7235673 (2007-06-01), Yamane et al.
DuPont product specification sheet—Glycolic Acid 70% Technical Solution.
DuPont product specification sheet—Glycolic Acid 70% Solution High Purity.

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