Process and apparatus for continual melt hydrolysis of acetal copolymers
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United States of America Patent
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Jul 3, 1984
Issued Date -
N/A
app pub date -
Aug 19, 1983
filing date -
Feb 19, 1982
priority date (Note) -
Expired
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Abstract
The present invention is an improved method for stabilizing acetal copolymers by hydrolyzing the copolymer product in a low energy reaction process wherein undesirable side products are continuously and efficiently removed by melting and extruding the unhydrolyzed oxymethylene copolymer into a hydrolysis reaction zone in which the necessary reactants are intimately contacted with the copolymer, preferably by means of flow division and rearrangement mixing technique. Subsequently, the hydrolyzed copolymer product is devolatilized to remove the unwanted side products by passing it through a devolatilization zone preferably having more than one devolatilization port and a vacuum source from which negative pressure is available for application to the devolatilization ports so that the undesired products may be effectively removed.
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