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    • 16. 发明授权
    • Preparation of purified terephthalic acid from waste polyethylene
terephthalate
    • 从废聚对苯二甲酸乙二醇酯制备纯化的对苯二甲酸
    • US5095145A
    • 1992-03-10
    • US609202
    • 1990-11-05
    • Bruce I. Rosen
    • Bruce I. Rosen
    • C07C51/09
    • C07C51/09C08J11/14C08J2367/02Y02W30/704
    • A process is disclosed for producing fiber-grade terephthalic acid from waste polyethylene terephthalate film, fiber, bottles, manufacturing residues, and other manufactured articles. The process comprises depolymerizing waste polyethylene terephthalate in an aqueous mixture to obtain crude terephthalic acid having a b*-value less than 10.00 and an RFCVIS value of about 5000, or greater, which is thereupon hydrogenated in aqueous solution for a period of up to 8 hours. Organic and inorganic impurities are retained in the aqueous components. The purified terephthalic acid has a b*-value less than 2.00, a relative fluorescence concentration in visible light (RFCVIS) of less than 2500, metals content less than 100 ppmw and total organic impurities of less than 1000 ppmw.
    • 公开了一种从废聚对苯二甲酸乙二醇酯膜,纤维,瓶,制造残余物和其它制品制造纤维级对苯二甲酸的方法。 该方法包括将废聚对苯二甲酸乙二醇酯解聚在水性混合物中以获得具有小于10.00的ab *值的粗对苯二甲酸和约5000或更大的RFCVIS值,然后在水溶液中氢化至多8小时 。 有机和无机杂质保留在水性组分中。 纯化的对苯二甲酸具有小于2.00的b *值,可见光(RFCVIS)中的相对荧光浓度小于2500,金属含量小于100ppmw,总有机杂质小于1000ppmw。