Chemical and Environmental Engineering Department, School of Engineering of Bilbao, Alda Urquijo, 48013 Bilbao, Spain.
Waste Manag. 2011 Sep-Oct;31(9-10):1973-83. doi: 10.1016/j.wasman.2011.05.021.
In this work, the results obtained in catalytic pyrolysis of three plastic waste streams which are the rejects of an industrial packing wastes sorting plant are presented. The samples have been pyrolysed in a 3.5 dm(3) reactor under semi-batch conditions at 440 °C for 30 min in nitrogen atmosphere. Commercial ZSM-5 zeolite has been used as catalyst in liquid phase contact. In every case, high HHV gases and liquids which can be useful as fuels or source of chemicals are obtained. A solid fraction composed of the inorganic material contained in the raw materials and some char formed in the pyrolysis process is also obtained. The zeolite has shown to be very effective to produce liquids with great aromatics content and C3-C4 fraction rich gases, even though the raw material was mainly composed of polyolefins. The characteristics of the pyrolysis products as well as the effect of the catalyst vary depending on the composition of the raw material. When paper rich samples are pyrolysed, ZSM-5 zeolite increases water production and reduces CO and CO(2) generation. If stepwise pyrolysis is applied to such sample, the aqueous liquid phase can be separated from the organic liquid fraction in a first low temperature step.
本工作介绍了在工业包装废物分拣厂废料中选择的三种塑料废物流的催化热解中获得的结果。在氮气气氛下，在 3.5 dm(3)反应器中于 440°C 下以半分批条件进行 30 分钟的热解。商业 ZSM-5 沸石用作液相接触的催化剂。在每种情况下，都获得了高热值的气体和液体，它们可用作燃料或化学品的来源。还获得了由原料中所含的无机材料和在热解过程中形成的一些焦炭组成的固体部分。尽管原料主要由聚烯烃组成，但沸石已被证明非常有效地生产具有高芳烃含量和富含 C3-C4 馏分的液体和气体。热解产物的特性以及催化剂的作用取决于原料的组成。当富含纸的样品进行热解时，ZSM-5 沸石会增加水的产量并减少 CO 和 CO(2)的生成。如果对这样的样品进行分步热解，则可以在第一步低温下将水相从有机液相中分离出来。
