Sustainable Process for the Recycling of Polyethylene Phthalate
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United States of America Patent
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Issued Date -
Sep 7, 2017
app pub date -
Nov 29, 2016
filing date -
Mar 4, 2016
priority date (Note) -
Abandoned
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Abstract
A method of processing one or more streams in a phthalate-containing polymer recycling system, the method comprising receiving an extract stream and a raffinat4e stream from a liquid chromatography unit, which is part of the polymer recycling system, wherein the extract stream comprises a bis(hydroxyalkyl) phthalate monomer, C2-5 alkylene diol, and solvent, and wherein the raffinate stream comprises first impurities, C2-5 alkylene diol, and solvent; vacuum distilling the extract stream to produce a first solvent stream and a monomer and diol stream comprising the bis(hydroxyalkyl) phthalate monomer and C2-5 alkylene diol; subjecting the monomer and diol stream to steam separation to produce a monomer stream comprising the bis(hydroxyalkyl) phthalate monomer and water, and a diol stream comprising C2-5 alkylene diol and water; and vacuum distilling the raffinate stream to produce a second solvent stream and a first impurities stream comprising first impurities and C2-5 alkylene diol.
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