The process for the purification of bis(2-hydroxyethyl)terephthalate obtained from the depolymerization of waste containing polyethylene terephthalate.

Abstract

DEPCT68 The process for purifying bis(2-hydroxyethyl) terephthalate (BHET) from... Crude solution, which is obtained by the depolymerization of polyethylene terephthalate waste. (PET) containing at least one polymer barrierd by glycolysis with ethylene glycol. (EG), in which water is added, which acts as a solvent inhibitor for the barrier polymer in an amount which The temperature was determined and controlled in a way that ensured a significant reduction in... In terms of the solubility of the polymer, it acts as a barrier without causing any adverse effects. To precipitate BHET and its specific oligomer, water is added to the BHET solution. Rough in at least two distinct phases with a decreasing weight ratio between EG and H2O and... Lowering the temperature in this manner makes the removal of the barrier polymer more efficient and does not... This leads to the precipitation of BHET and its oligomers; moreover, in this manner. It is possible to maintain the volume of liquid to be treated within a relatively reduced value, in order to... Avoid equipment obstructions associated with handling large volumes of liquids by suctioning and / or removing them. Or filtration, which would cause inconvenience in the process from an industrial perspective;

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