METHOD FOR PRODUCING A PURIFIED AND DECOLOURISED DIESTER MONOMER, BYMEANS OF DEPOLYMERISATION OF A POLYESTER FEEDSTOCK
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United States of America Patent
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Issued Date -
Aug 29, 2024
app pub date -
Jun 7, 2022
filing date -
Jun 17, 2021
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Abstract
The present invention relates to a process for depolymerization of a polyester feedstock comprising PET, comprising:
- a) a step for conditioning the polyester feedstock, to produce a conditioned feedstock stream;b) a step of depolymerization of the conditioned feedstock stream, at a temperature of between 150 and 300° C., in the presence of diol with a ratio by weight between the diol and the diester in the feedstock of between 0.3 and 8.0, to produce a reaction effluent;c) a step of separation of the diol from the reaction effluent, to produce at least a liquid monomers effluent;d) a step of separation of the liquid monomers effluent into a heavy impurities effluent and a prepurified monomers effluent; ande) a step of purification of the prepurified monomers effluent, comprising a substep e1) of adsorption at a temperature of between 50 and 200° C. and a crystallization substep e2), and producing at least one decolourized purified diester monomer effluent.
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