Research progress in high value-added utilization technology of waste plastics

doi:10.16085/j.issn.1000-6613.2022-0677

Abstract

Abstract:

The low degradability of waste plastics will continue to pollute the environment, and the spread of the COVID-19 has exacerbated the use and accumulation of plastics, and thus the efficient treatment of waste plastic resources has become an urgent technical problem to be solved. By analyzing several mainstream waste plastics treatment technologies, it was clear that resourceful and high value-added utilization technology was the most competitive and environmentally friendly waste plastics treatment route in the market. The research progress of high value-added utilization technology of waste plastics at home and abroad in recent years were reviewed. The development and variation of conventional thermal cracking technology were discussed. Through this route, the highest yield of waste plastics into fuel products can reach 97%—98%. It was pointed out that the conversion of waste plastics into jet fuel, high value-added chemicals and functional materials for special applications through chemical, catalytic and biological technologies was the mainstream research direction and development trend in this field. Among them, the yield of conversion to high value-added monomer could reach more than 97%, so as to realize the upgrading of plastic waste from the primary treatment stage of "waste clearance" to "turning waste into use" and "turning waste into treasure", and help China achieve the goal of "double carbon"。

Key words: waste plastic, high value-added utilization, fuels, chemicals, functional materials

摘要：

废塑料的低降解性会对环境造成持续污染，新冠疫情的扩散更加剧了塑料的使用与累积，因此废塑料资源的高效处理成为了亟待解决的技术问题。本文分析了当前主流的几种废塑料处理技术路线，认为资源化高附加值利用技术是最具有市场竞争力与绿色环保性的废塑料处理路线。综述了近年来国内外对于废塑料资源化高附加值利用技术的研究进展，讨论了传统热裂解技术的发展与变型，通过该路线废塑料转化为燃料产品的最高收率可达97%~98%（质量分数）。重点介绍了催化转化、化学处理、生物酶化、电催化、催化碳化以及电池能源化等新型技术手段，指出通过化学、催化、生物等多种技术手段实现将废塑料转化为喷气燃料、高附加值化学品与特殊用途的功能材料是该领域未来主流的研究方向与发展趋势，其中转化为高附加值单体的收率可达97%（质量分数）以上，从而实现将塑料垃圾从“清零”的初级处理阶段升级至“变废为用”、“变废为宝”，助力中国完成“双碳”目标。

关键词: 废塑料, 高附加值利用, 燃料, 化学品, 功能材料

CLC Number:

X705

FAN Siqiang, PENG Shaozhong, PENG Chong, HU Yongkang. Research progress in high value-added utilization technology of waste plastics[J]. Chemical Industry and Engineering Progress, 2023, 42(2): 1020-1027.

范思强, 彭绍忠, 彭冲, 胡永康. 废塑料高附加值利用技术研究进展[J]. 化工进展, 2023, 42(2): 1020-1027.

Figures/Tables 5

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原料	主要工艺条件	处理方式	研究亮点	参考文献
高密度聚乙烯（HDPE）	500~800℃（最佳550℃）、N₂气氛	热裂解	热解油550℃时收率达到70%（质量分数），主要是C₈~C₁₂的轻油馏分	[21]
高密度聚乙烯（HDPE）	430~490℃、 15~60min	热裂解	430℃下处理15min，裂解油收率可达90.3%（质量分数），性质与CGO相似 460℃下处理60min，裂解油性质与LCO相似	[22]
低密度聚乙烯（LDPE）、高密度聚乙烯（HDPE）、聚丙烯（PP）混合塑料	300~400℃	热裂解	液体产品收率达到82%（质量分数），具有高辛烷值（约92）、高热值和低黏度等优质燃料特性	[23]
聚丙烯（PP）	450~600℃	热裂解	液体产品收率为81%~93%（质量分数），常压下处理得到汽油馏分产品收率高而真空条件下得到柴油馏分产品收率高，升温速率的快慢会影响液体产物分布	[24]
低密度聚乙烯（LDPE）	450~650℃、加热速率1~30℃/S	热裂解/催化热解（HZSM-5）	在热裂解中，较高的加热速率，即20℃/s有利于提高液态油的生成，在550℃时获得最大产油量93.42%（质量分数）；催化热解中HZSM-5 的引入大大提高液体产品质量	[25]
聚丙烯（PP）、聚苯乙烯（PS）	500~600℃、加热速率10~100℃/min	催化裂解（HZSM-5）	稻草和甘蔗渣与聚丙烯和聚苯乙烯进行了共裂解，催化剂的引入提高生成油品的质量，黏度、密度和闪点与轻质燃料油相似同时氧含量大大降低	[26]
聚丙烯（PP）	7.0MPa、350℃	催化裂解（Ni-Au/MOR）	生成的液体产品主要由正构烷烃、异构烷烃与芳烃组成，与石化来源的柴油相似度达90%	[27]
混合塑料：低密度聚乙烯（LDPE）、高密度聚乙烯（HDPE）、聚丙烯（PP）、聚苯乙烯（PS）	2.0MPa、 375~425℃	催化裂解（Al-SBA-15/Al-SBA-16）	高温下催化剂差别不影响反应效果，低温下Al-SBA-15显示出良好的活性，液体产品收率更高	[28]

原料	主要工艺条件	处理方式	研究亮点	参考文献
高密度聚乙烯（HDPE）	500~800℃（最佳550℃）、N₂气氛	热裂解	热解油550℃时收率达到70%（质量分数），主要是C₈~C₁₂的轻油馏分	[21]
高密度聚乙烯（HDPE）	430~490℃、 15~60min	热裂解	430℃下处理15min，裂解油收率可达90.3%（质量分数），性质与CGO相似 460℃下处理60min，裂解油性质与LCO相似	[22]
低密度聚乙烯（LDPE）、高密度聚乙烯（HDPE）、聚丙烯（PP）混合塑料	300~400℃	热裂解	液体产品收率达到82%（质量分数），具有高辛烷值（约92）、高热值和低黏度等优质燃料特性	[23]
聚丙烯（PP）	450~600℃	热裂解	液体产品收率为81%~93%（质量分数），常压下处理得到汽油馏分产品收率高而真空条件下得到柴油馏分产品收率高，升温速率的快慢会影响液体产物分布	[24]
低密度聚乙烯（LDPE）	450~650℃、加热速率1~30℃/S	热裂解/催化热解（HZSM-5）	在热裂解中，较高的加热速率，即20℃/s有利于提高液态油的生成，在550℃时获得最大产油量93.42%（质量分数）；催化热解中HZSM-5 的引入大大提高液体产品质量	[25]
聚丙烯（PP）、聚苯乙烯（PS）	500~600℃、加热速率10~100℃/min	催化裂解（HZSM-5）	稻草和甘蔗渣与聚丙烯和聚苯乙烯进行了共裂解，催化剂的引入提高生成油品的质量，黏度、密度和闪点与轻质燃料油相似同时氧含量大大降低	[26]
聚丙烯（PP）	7.0MPa、350℃	催化裂解（Ni-Au/MOR）	生成的液体产品主要由正构烷烃、异构烷烃与芳烃组成，与石化来源的柴油相似度达90%	[27]
混合塑料：低密度聚乙烯（LDPE）、高密度聚乙烯（HDPE）、聚丙烯（PP）、聚苯乙烯（PS）	2.0MPa、 375~425℃	催化裂解（Al-SBA-15/Al-SBA-16）	高温下催化剂差别不影响反应效果，低温下Al-SBA-15显示出良好的活性，液体产品收率更高	[28]

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