PRODUCTION METHOD AND PRODUCTION DEVICE FOR POLYVINYL ALCOHOL
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United States of America Patent
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Issued Date -
Jan 3, 2013
app pub date -
Dec 6, 2010
filing date -
Mar 18, 2010
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Abandoned
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Abstract
Provided are a method and an apparatus for producing a polyvinyl alcohol that can remove unreacted monomers from the polymerization solution efficiently and reduce the amount of methanol injected. A polymerization solution obtained by polymerization of one or more vinyl esters or copolymerization of a vinyl ester with other monomers copolymerizable therewith is adjusted to a particular concentration by addition of liquid methanol and then brought into contact with methanol vapor in counter-current flow for separation into a monomer-free polymer solution and a monomer/methanol mixture. The monomer-free polymer solution is then saponified in the presence of a catalyst to give a polyvinyl alcohol.
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