含氯有机废料资源化处理基础研究II.热重法研究PVC热解脱氯过程

Treatment and Recovery as Resources of Chlorine-containing Organic Waste II. PVC Pyrolysis Dechlorination by Using Thermogravimetric Technique

对不同升温速率下 PVC热失重曲线 ( TG)以及热解产物的元素组成进行了分析 ,结果表明 PVC热解分为两阶段。第一阶段为主要的脱氯阶段 ,主要产物为 HCl,并伴随有缩聚反应 ,反应为一级反应 ,反应活化能为 1 30 k J/mol。第二阶段为初步脱 HCl的残留物进一步裂解 ,生成线型和环状结构的低分子烃类混合物。不同升温速率条件下得到的 TG曲线形状类似 ,随着加热速率的增大 。

The weight loss curves of PVC pyrolysis process and the elemental analysis of product were investigated by using thermogravimetric technique. The results show that the PVC pyrolysis is a two step process. The first step, the main dechlorination process accompanied with polymerization, is a first order reaction, activation energy of which is 130kJ/mol. The second step is the further cracking process of the residue which produces the low molecular hydrocarbon species mixture. TG curves obtained under different heating rate are similar and drift rightwards as a whole with the increasing of heating rate.