In this research, a solvent thermal dechlorination method was adopted to remove chlorine from polyvinyl chloride (PVC) material, using ethylene glycol (EG) as solvent and adding alkaline additives, so as to improve the dechlorination efficiency and reduce the reaction temperature. KOH, NaOH and K₂CO₃ were selected as additives and their dechlorination activity was found to decrease in the following order: K₂CO₃ >KOH>NaOH. Afterward, the effect of K₂CO₃ concentration, reaction temperature and reaction time on the dechlorination of PVC was studied and a novel dechlorination mechanism was investigated. The results showed that solvothermal dechlorination may accomplish efficient dechlorination at low temperatures. The reaction temperature can be reduced to 180 ℃ in 0.5 M K₂CO₃/EG system with a solid-liquid ratio of 1:40(g:ml) and more than 97% dichlorination, which is 10 ℃ lower than the lowest temperature reported in published literature. Through the characterization and analysis of solid products, the dechlorination mechanism of PVC in K₂CO₃/EG system was proposed. Glycolate ion and OH^- may be formed in the reaction and they both work to dechlorinate PVC by removing the Cl through two distinct substitution reactions.

本研究采用溶剂热脱氯法对聚氯乙烯（PVC）材料进行脱氯，以乙二醇（EG）为溶剂，添加碱性助剂，提高脱氯效率，降低反应温度。KOH、NaOH和K₂CO₃作为添加剂，发现它们的脱氯活性按如下顺序降低：K₂CO₃>KOH>NaOH。随后研究了K₂CO₃浓度、反应温度和反应时间对PVC脱氯的影响，探讨了一种新的脱氯机理。结果表明，溶剂热脱氯可以在低温下实现高效脱氯。₂CO₃中，反应温度可降低至180℃，二氯化率达到97%以上，比报道的最低温度低10℃在出版的文献中。通过对固体产物的表征和分析，提出了₂CO₃反应中可能会形成乙醇酸根离子和 OH^-