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Polyethylene terephthalate recovery from waste - using hydrocyclones and pref. aq. ethylene glycol as separating liq., extruding and polycondensing
Polyethylene terephthalate recovery from waste - using hydrocyclones and pref. aq. ethylene glycol as separating liq., extruding and polycondensing
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机译:使用旋液分离器和废料从废物中回收聚对苯二甲酸乙二酯。水乙二醇作为分离液,挤出和缩聚
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摘要
Ethylene glycol is used as separating liq. in polyethylene terephthalate recovery from mixts., using at least one hydrocyclone and a separating liq. The glycol pref. contains up to 50 wt.% water, w.r.t. glycol and water mixt. The ethylene glycol-contg. recovered polyethylene terephthalate particles are extruded, polycondensed and processed to fibres or filaments. Ethylene glycol residues adhering to the polyethylene terephthalate do not disturb further processing. The ethylene glycol is released in subsequent condensn. and also takes up dissolved impurities. Polyethylene terephthalate waste, e.g. from polyethylene terephthalate bottles contg. also polyethylene and paper, is recovered and used as fibre raw material.
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