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    • 5. 发明授权
    • Method and apparatus for pyrolytically decomposing waste plastic
    • 热塑性分解废塑料的方法和装置
    • US5608136A
    • 1997-03-04
    • US262185
    • 1994-06-20
    • Yukishige MaezawaTerunobu HayataHideki ShimadaIsao ItoKazuo SuzukiMasahiro TadauchiFuminobu TezukaJiro Kano
    • Yukishige MaezawaTerunobu HayataHideki ShimadaIsao ItoKazuo SuzukiMasahiro TadauchiFuminobu TezukaJiro Kano
    • C10B53/07C10G1/00C10G1/02C10G1/10C10B57/00A62D3/00
    • C10G1/10C10B53/07C10G1/00C10G1/006C10G1/02Y02P20/143
    • Disclosed is a method and an apparatus for pyrolytically decomposing waste plastic, e.g. PVC, to recover light fuel oil. The invention enables to prevent the product from contamination by halogen compounds. The plastic is first thermally decomposed in an atmosphere of a normal or reduced pressure to produce a primary decomposition product in the form of gas and a decomposition residue. The primary decomposition product is cooled at a first cooling temperature to separate the primary decomposition product into a relatively light fraction containing a desired light constituent and a relatively heavy fraction by condensation of the relatively heavy fraction, and the relatively heavy fraction is then thermally decomposed in an atmosphere pressurized at a predetermined pressure to produce a secondary decomposition product containing the desired light constituent in the form of gas. The relatively light fraction and the secondary decomposition product are cooled at a second cooling temperature to condense a fraction containing the desired light constituent. This method may be changed so that the first and second thermal decomposition steps are performed at the same high pressure in one vessel and the heavy fraction is circulated. Additionally, alkali treatment of time plastic to be decomposed or the decomposition gas, thermal pretreatment of the plastic and addition of water or catalyst to the plastic can be used. The decomposition apparatus which is so systematized that the decomposition can be continuously performed is shown.
    • 公开了一种用于热解分解废塑料的方法和装置,例如, PVC,回收轻油。 本发明能够防止产物被卤素化合物污染。 该塑料首先在正常或减压的气氛中热分解,以产生气体和分解残渣形式的初级分解产物。 初级分解产物在第一冷却温度下冷却,以通过相对重馏分的冷凝将初级分解产物分离成含有所需光成分和相当重馏分的较轻馏分,然后相对较重的馏分在 以预定压力加压的气氛,以产生含有气体形式的所需光成分的二次分解产物。 相对较轻的馏分和二次分解产物在第二冷却温度下冷却以冷凝含有所需的轻组分的馏分。 该方法可以改变,使得第一和第二热分解步骤在一个容器中以相同的高压进行,并且重馏分循环。 此外,可以使用待分解的时间塑料或分解气体,塑料的热预处理和向塑料中添加水或催化剂的碱处理。 示出了能够连续进行分解的分解装置。