Process for producing high-molecular polyacetals
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United States of America Patent
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Jul 20, 1982
Grant Date -
N/A
app pub date -
Jul 30, 1981
filing date -
Jul 30, 1981
priority date (Note) -
Expired
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Abstract
A process for producing high-molecular polyacetals, comprising polymerization of gaseous formaldehyde or copolymerization thereof with cyclic formals or cyclic oxides; formaldehyde is admitted into the reaction zone in a gas mixture which is the product of catalytic oxidative dehydrogenation of methanol, wherefrom H.sub.2 O, CH.sub.3 OH and H COOH contaminants have been preliminarily removed. The process of polymerization or copolymerization is carried out in an inert hydrocarbon solvent in the presence of an ionic-type catalyst at a temperature within the range of from -50.degree. to +120.degree. C. with the formation of a vapor phase which is removed from the reaction zone.
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