文献类型：期刊文献

英文题名：Co-pyrolysis of polyvinyl chloride and waste rubber: Interaction mechanism during staged pyrolysis

作者：Sheng, Yue[1,2];Tang, Longfei[1,2];Zhang, Chang[1,2];Pan, Weitong[1,2];Ding, Lu[1,2];Chen, Xueli[1,2];Wang, Fuchen[1,2]

机构：[1]Minist Educ, Engn Res Ctr Resource Utilizat Carbon Containing W, Shanghai 200237, Peoples R China;[2]East China Univ Sci & Technol, Shanghai Engn Res Ctr Coal Gasificat, Shanghai 200237, Peoples R China

年份：2025

卷号：13

期号：6

外文期刊名：JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING

收录：;EI(收录号：20254719550354);WOS:【SCI-EXPANDED(收录号:WOS:001607174000002)】；

基金：This work was supported by the project of the National Key Research and Development Program of China (2024YFB4006701).

语种：英文

外文关键词：Co-pyrolysis; Polyvinyl chloride; Waste rubber; Synergistic effect; Sulfur and chlorine migration

摘要：Pyrolysis is a clean and efficient resource recovery pathway of waste polymers. However, the interaction mechanism between typical components is unclear during pyrolysis process. In this work, reciprocal effects of staged co-pyrolysis process of polyvinyl chloride (PVC) and waste rubber (WR) were investigated by a fixed-bed reaction device. Results showed that the thermal decomposition was promoted when the temperature was < 340 degrees C, while it was inhibited when the temperature was > 340 degrees C, especially at 400 degrees C. The synergistic effect was enhanced by the increasing of PVC during first stage co-pyrolysis (300 degrees C). Gas yield decreased by 12.7-72.4 %, mainly due to the adsorption of chlorine (21.9-51.0 %) into char. Tar yields (7.5-9.5 wt%) were improved by 38.5-63.6 %. The content of aliphatic carbon in char (22.88 % PVC) increased by 62.1 %. In addition, the distribution of sulfur in the char was reduced from 86.6 % to 43.1 %. This was mainly due to the free radicals from PVC, which promoted the breaking of C-S in WR and increased hydrogen sulfide. For the second stage of co-pyrolysis (400 degrees C), the inhibitory effect was similarly enhanced with PVC proportion. Tar yields (37.9-41.4 wt%) were decreased by 0.4-20.1 %. Char yields (28.1-61.5 wt%) increased by 0.4-14.5 %. The aromatic carbon content in char increased from 18.6 % (300 degrees C) to 70.3 %. This was mainly due to polycondensation and melt-coating of the PVC. Therefore, the co-pyrolysis process of PVC and WR showed a synergistic and then inhibitory change with temperature.