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热解是实现铝塑包装废物中有机物和金属铝分离的有效方法。利用外热式固定床系统研究了铝塑热解时最主要的影响因素——温度(673~873 K)对热解产物(固体残渣、热解油与气体)分布和性质的影响。结果表明,铝塑热解主要发生在723 K之前,并且固体残渣在超过773 K时出现AlN,回收Al的纯度降低,因此铝塑热解要将温度控制在723~773 K之间。并且产物中热解气体产率最大,在温度较高时,CH4与C2H4含量较高;热解油是以C5—C35正构烯烃为主的宽沸点油。
Pyrolysis is an effective method to separate organic matter from aluminum in aluminum-plastic packaging waste. The influence of temperature (673 ~ 873 K) on the distribution and properties of pyrolysis products (solid residue, pyrolysis oil and gas) was studied by using an externally heated fixed bed system. The results show that the aluminum-plastic pyrolysis occurs mainly before 723 K, and AlN appears when the solid residue exceeds 773 K. The purity of the recovered Al decreases. Therefore, the pyrolysis temperature should be between 723 K and 773 K. And the yield of pyrolysis gas in the product is the largest. At higher temperature, CH4 and C2H4 contents are higher. The pyrolysis oil is a wide boiling oil mainly composed of C5-C35 normal olefins.