聚乙烯与焦油模型化合物共裂解协同反应机理研究

Plastic waste has caused an increasing number of serious environmental problems and social issues. How to achieve clean recycling disposal of plastic waste has become a very important and urgent task. Conventional plastics waste treatment methods may easily cause problems like secondary pollution and the disposal is not satisfactory. Now pyrolysis technology has become a hot topic in the field of waste disposal. With regard to the problems of plastic waste including low thermal conductivity and easily coking of thermal cracking process, this research proposes innovative ideas that co-cracking plastic waste with combustible solid waste tar, in order to achieve the goal--deal with waste with waste. Taking polyethylene which counts the largest proportion of waste plastic and the typical component of combustible solid waste tar as the object, the research systematically studies the co-cracking reaction process and promotion interaction between polyethylene and tar model compound, reveals the law of hydrogen transfer during co-cracking reaction, explores the synergistic reaction mechanism with the core of hydrogen transfer in co-cracking of polyethylene with tar model compound and further explores the directional preparation method of polyethylene and tar model compound to low carbon compound. These can provide important theoretical basis and technical support of large-scale and efficient resource utilization of plastic waste and combustible solid waste tar, while accelerating the clean recycling disposal process of plastic waste and combustible solid waste tar.

塑料废弃物日益增多已引起严重的环境问题和社会问题，如何实现塑料废弃物的清洁再利用处置已成为一项十分重要而紧迫的任务。塑料废弃物常规处理方法存在易造成二次污染等问题且处置效果不理想，热解技术已成为废弃物处置领域的研究热点。本项目针对塑料废弃物导热系数低、热裂解过程中易结焦等难题，创新地提出将塑料废弃物与可燃固废焦油进行共裂解，以实现“以废制废”。以塑料废弃物中比例最大的聚乙烯与依据可燃固废焦油组分特点构建的焦油模型化合物作为研究对象，系统研究聚乙烯与焦油模型化合物共裂解反应过程及其交互促进作用，揭示共裂解过程中氢转移规律，探究以氢转移为核心的聚乙烯与焦油模型化合物共裂解协同反应机理，并进一步探讨聚乙烯与焦油模型化合物定向制备低碳化合物方法，为塑料废弃物和可燃固废焦油大规模高效资源化利用提供重要的理论基础与技术支撑，同时加速塑料废弃物和可燃固废焦油的清洁再利用处置进程。

塑料废弃物日益增多已引起严重的环境问题和社会问题，如何实现塑料废弃物的清洁再利用处置已成为一项十分重要而紧迫的任务。塑料废弃物常规处理方法存在易造成二次污染等问题且处置效果不理想，热解技术已成为废弃物处置领域的研究热点。本项目针对塑料废弃物导热系数低、热裂解过程中易结焦等难题，提出将塑料废弃物高压热解转化制取燃料油和化工原料。以塑料废弃物中比例最大的聚乙烯作为研究对象，系统研究温度、压力对聚乙烯高压热解过程的影响，揭示高压热解过程中氢转移规律，探究以氢转移为核心的聚乙烯高压热解反应机理，并进一步探讨聚乙烯定向制备低碳化合物方法，为塑料废弃物大规模高效资源化利用提供重要的理论基础与技术支撑，同时加速塑料废弃物的清洁再利用处置进程。