Method for depolymerizing polymethylmethacrylate
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United States of America Patent
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Oct 22, 2002
Grant Date -
N/A
app pub date -
Jun 21, 2001
filing date -
Sep 21, 1998
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The present invention relates to a process of recovering monomeric esters of substituted or unsubstituted acrylic acid from polymer material having corresponding structural units by depolymerization by means of a fine-grained heat-transfer medium which is maintained above the depolymerization temperature of the polymer material. In a reactor, the polymer material is brought in contact with hot, mechanically fluidized heat-transfer medium. The resulting vapors are withdrawn and condensed, where the hot heat-transfer medium is continuously supplied at one end of the reactor, and cooled heat-transfer medium is discharged at the other end.
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