Methods for removing catalyst residue from a depolymerization process stream
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United States of America Patent
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Jun 8, 2010
Grant Date -
Oct 19, 2006
app pub date -
Mar 24, 2006
filing date -
Mar 25, 2005
priority date (Note) -
Expired
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Abstract
The invention relates to methods and systems for selective removal of catalyst residue from a depolymerization product stream without a water quench, as well as methods and systems for subsequent recovery of residual linear oligomer. The substantially metal-free and substantially water-free residual oligomer byproduct can then be advantageously used as recyclate in a process for preparing MPO. For example, the residual oligomer recyclate can be used as a reactant in the polymerization and subsequent depolymerization (cyclization) of low-acid polyester to form MPO.
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