废旧轮胎催化裂解研究进展

Huge amounts of waste tires are difficult to degrade and they pollute the environment. Therefore, waste tires are thought as a kind of black pollution. Catalytic cracking is an important means for the treatment of waste tires, which can not only achieve efficient conversion and resource utilization but also obtain high value-added chemical products, such as monocyclic aromatic hydrocarbons, light olefins and limonene. In this paper, the distribution characteristics of catalytic cracking products of waste tires are discussed from the aspects of physical structure and chemical composition, catalytic cracking process and characteristics of cracking products, reactor types and characteristics, catalyst types and functions, and process conditions. By comparing the effects of reactors, catalysts and process conditions on the product distribution, the existing problems for the industrialization of catalytic cracking of waste tires are further analyzed. According to the current research situation of catalytic cracking of waste tires, it is proposed that reactors and supporting processes suitable for large-scale treatment should be designed, and catalysts with high stability and high selectivity for specific products should be developed at the same time. The resource utilization of waste tires characterized by low energy consumption, high conversion and high added value is then realized.