Catalytic Pyrolysis Kinetics And Experimental Study Of Waste Tires Based On FCC Discharge Agent

Worldwide,how to solve the problem of waste tire disposal environmentally has attracted the attention of the government and researchers.Compared with the traditional treatment method,pyrolysis pyrolysis,a method to promote the decomposition of materials through high temperature heating,is considered to be a highly potential and environmentally friendly treatment method.However,due to the lack of theoretical support for the pyrolysis process,many industrial parameters need to be set through experience accumulation,which not only increases the investment of time and cost,but also is not conducive to optimizing the product structure.Therefore,it is necessary to provide theoretical basis for improving pyrolysis process parameters and optimizing product structure through kinetic analysis.As a special heterogeneous substance,waste tires contain complex components,and it is impossible to obtain accurate kinetic equations through a single kinetic analysis method.Therefore,by discussing the various kinetic analysis methods,a theoretically perfect analysis method suitable for the pyrolysis of waste tires was proposed and the corresponding mechanism was established.The main research contents of this article are as follows:(1)This paper proposes a multi-kinetics research method suitable for studying polymer materials with complex composition like waste tires.The main feature of this method is that the dynamics solving process does not involve model assumptions,and includes model testing and model parameter modification.(2)The multi-kinetic method was used to solve the three kinetic factors of different materials of waste tires based on the separated sub-reactions,and compared with the literature.(3)Based on the separated sub-reactions,a physical reaction mechanism that can describe the pyrolysis reaction of waste tire tread rubber was proposed: the tread rubber sub-reaction I and II are in accordance with the "nucleation mechanism" and "random nucleation and subsequent growth mechanism".(4)The effect of spent petroleum fluid catalytic cracking catalyst(FCC discharge agent)on the pyrolysis kinetics of waste tires was studied: when the dosage of the catalyst was 30 wt.% of waste tires,the activation energy of the pyrolysis of the tread rubber decreased 19.94%;the active pyrolysis energy of the inner liner was decreased 27.4%.Based on the above analysis,it is reasonable to divide the pyrolysis process of waste tires into two reaction stages based on separated sub-reactions,and different reaction stages present different reaction mechanisms.In addition,the kinetic analysis results show that from the perspective of reducing the pyrolysis reflection activation energy,the effect of FCC discharge agent on the inner liner adhesive was more prominent,because the inner liner was made by synthetic rubber.Through experimental research,it has been determined that the best use ratio of FCC discharge agent to waste tires was 1/4.5,the effective service life was 2 times,and the failure mode was mainly lattice damage.