Impact of exogenous additives on hydrothermal dechlorination performance of polyvinyl chloride

doi:10.16085/j.issn.1000-6613.2021-0979

Abstract

Abstract:

Proper treatment of polyvinyl chloride (PVC) waste is challenge as it is not easily degraded and incineration can lead to environmental issue as it will produce toxic chemicals. In this study, a hydrothermal carbonization approach was applied to treat PVC waste. The influence of exogenous additives on dechlorination efficiency of PVC were evaluated. The results showed that, with exogenous additive, substitution, elimination, dehydration and aromatization reaction were enhanced during hydrothermal carbonization. The maximum dechlorination efficiency of 97.50% was achieved with the mass ratio of 1.4% between rice straw and PVC resin at hydrothermal carbonization temperature 240℃ for 120min. The calorific value of hydrothermal charcoal was relatively higher (39.57MJ/kg ± 0.40MJ/kg), indicating a good combustion process. This study presented a novel and sustainable approach, which could convert PVC-waste as a form of solid fuel.

Key words: hydrothermal carbonization, dechlorination, polyvinyl chloride (PVC), exogenous additives

摘要：

针对聚氯乙烯（PVC）垃圾难降解且焚烧处理会产生有毒物质造成环境污染等问题，本文提出了水热碳化技术处理的新途径。同时研究了不同外源添加物与PVC树脂协同水热碳化对提高脱氯效率的影响。结果显示生物质的添加可以促进PVC水热碳化反应中取代、消除、脱水和芳构化反应。当水稻秸秆与PVC树脂质量比为1.4、水热温度240℃、反应120min时，脱氯效率可达97.50% ± 1.40%，固相产物高位热值为39.57MJ/kg± 0.40MJ/kg，燃烧性能好。该技术为PVC垃圾转化成固体燃料、实现可持续利用提供了新思路，具有广阔的应用前景。

关键词: 水热碳化, 脱氯, 聚氯乙烯, 外源添加物

CLC Number:

LI Yeqing, YANG Xingru, LIANG Zhuo, JIANG Hao, XU Quan, ZHOU Hongjun, FENG Lu. Impact of exogenous additives on hydrothermal dechlorination performance of polyvinyl chloride[J]. Chemical Industry and Engineering Progress, 2022, 41(5): 2706-2712.

李叶青, 羊省儒, 梁卓, 江皓, 徐泉, 周红军, 冯璐. 外源添加物强化聚氯乙烯水热碳化脱氯[J]. 化工进展, 2022, 41(5): 2706-2712.

Figures/Tables 9

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试剂编号	水热试剂	试剂质量
1	5%的NaOH、KOH、NH₃·H₂O、NaHCO₃，2.5%的Na₂CO₃溶液	碱性试剂100g
2	0、2.5%、5%、7.5%的甲醇溶液	甲醇溶液100g
3	0、2.5%、5%、7.5%的乙醇溶液	乙醇溶液 100g
4	工业木质素粉末（木质素质量分数≥93.7%）	木质素1g、3g、5g、7g，去离子水100g
5	工业木质素粉末（木质素质量分数≥93.7%）2.5%、5%、7.5%乙醇溶液	木质素1g、3g、5g、7g，乙醇溶液100g
6	木质素、5%乙醇溶液以及碱性试剂	乙醇溶液100g、木质素5g、碱性试剂为5g的NaOH、KOH、NH₃·H₂O、NaHCO₃，2.5g 的Na₂CO₃
7	玉米秸秆、水稻秸秆、酒糟（秸秆类）、酒糟（谷物类）以及木屑	生物质3g、5g、7g、9g，去离子水100g

试剂编号	水热试剂	试剂质量
1	5%的NaOH、KOH、NH₃·H₂O、NaHCO₃，2.5%的Na₂CO₃溶液	碱性试剂100g
2	0、2.5%、5%、7.5%的甲醇溶液	甲醇溶液100g
3	0、2.5%、5%、7.5%的乙醇溶液	乙醇溶液 100g
4	工业木质素粉末（木质素质量分数≥93.7%）	木质素1g、3g、5g、7g，去离子水100g
5	工业木质素粉末（木质素质量分数≥93.7%）2.5%、5%、7.5%乙醇溶液	木质素1g、3g、5g、7g，乙醇溶液100g
6	木质素、5%乙醇溶液以及碱性试剂	乙醇溶液100g、木质素5g、碱性试剂为5g的NaOH、KOH、NH₃·H₂O、NaHCO₃，2.5g 的Na₂CO₃
7	玉米秸秆、水稻秸秆、酒糟（秸秆类）、酒糟（谷物类）以及木屑	生物质3g、5g、7g、9g，去离子水100g

样品	C/%	H/%	O/%	Cl/%	高位热值/ MJ·kg^–1
B240	53.26 ± 1.31	6.18 ± 1.37	11.54 ± 1.58	29.02 ± 2.00	24.05 ± 0.47
H240	61.06 ± 2.37	7.89 ± 1.37	17.00 ± 2.03	14.05 ± 1.20	28.50 ± 0.37
YM	68.37 ± 1.77	11.29 ± 2.32	16.17 ± 2.22	4.17 ± 1.40	35.22 ± 0.18
SD	70.06 ± 1.17	14.33 ± 1.75	13.07 ± 2.22	2.54 ± 1.80	39.57 ± 0.40
JG	71.92 ± 2.40	9.54 ± 1.76	12.37 ± 2.24	6.17 ± 1.70	34.90 ± 0.37
GW	68.61 ± 2.16	10.33 ± 2.37	15.80 ± 1.58	5.26 ± 1.60	34.25 ± 0.44
MX	65.92 ± 1.23	16.27 ± 2.37	14.19 ± 1.77	3.62 ± 1.70	40.09 ± 0.31
A-YM	67.20 ± 2.46	10.24 ± 2.35	18.36 ± 2.81	4.20 ± 0.80	33.39 ± 0.16
A-SD	69.03 ± 2.19	12.33 ± 2.73	16.04 ± 2.55	2.60 ± 0.83	36.66 ± 0.55
A-JG	70.22 ± 2.78	8.37 ± 1.84	15.11 ± 2.60	6.30 ± 0.70	32.70 ± 0.093
A-GW	65.45 ± 2.66	12.13 ± 1.93	17.12 ± 2.27	5.30 ± 1.00	34.97 ± 0.014
A-MX	66.72 ± 2.58	14.25 ± 2.82	15.33 ± 2.34	3.70 ± 1.00	38.01 ± 0.65

样品	C/%	H/%	O/%	Cl/%	高位热值/ MJ·kg^–1
B240	53.26 ± 1.31	6.18 ± 1.37	11.54 ± 1.58	29.02 ± 2.00	24.05 ± 0.47
H240	61.06 ± 2.37	7.89 ± 1.37	17.00 ± 2.03	14.05 ± 1.20	28.50 ± 0.37
YM	68.37 ± 1.77	11.29 ± 2.32	16.17 ± 2.22	4.17 ± 1.40	35.22 ± 0.18
SD	70.06 ± 1.17	14.33 ± 1.75	13.07 ± 2.22	2.54 ± 1.80	39.57 ± 0.40
JG	71.92 ± 2.40	9.54 ± 1.76	12.37 ± 2.24	6.17 ± 1.70	34.90 ± 0.37
GW	68.61 ± 2.16	10.33 ± 2.37	15.80 ± 1.58	5.26 ± 1.60	34.25 ± 0.44
MX	65.92 ± 1.23	16.27 ± 2.37	14.19 ± 1.77	3.62 ± 1.70	40.09 ± 0.31
A-YM	67.20 ± 2.46	10.24 ± 2.35	18.36 ± 2.81	4.20 ± 0.80	33.39 ± 0.16
A-SD	69.03 ± 2.19	12.33 ± 2.73	16.04 ± 2.55	2.60 ± 0.83	36.66 ± 0.55
A-JG	70.22 ± 2.78	8.37 ± 1.84	15.11 ± 2.60	6.30 ± 0.70	32.70 ± 0.093
A-GW	65.45 ± 2.66	12.13 ± 1.93	17.12 ± 2.27	5.30 ± 1.00	34.97 ± 0.014
A-MX	66.72 ± 2.58	14.25 ± 2.82	15.33 ± 2.34	3.70 ± 1.00	38.01 ± 0.65

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