The Copyrolysis Process Study Of Waste Tire With Coal Tar For Fuel Oil And Carbon Black

In the background of constructing environment-friendly and resource-saving harmonious society, waste tires as one of solid wastes attract more and more people’s attention, the pyrolysis process of waste tire own a broad prospect in the number of waste tire treatment. However, pure waste tire pyrolysis own the issuses of low heat transfer efficiency and insufficient pyrolysis, so there was more and more scholars hope to improve the quality of pyrolysis by studying copyrolysis process of waste tire with other substances. This paper mainly researched the co-pyrolysis process of the coal tar and waste tire for fuel oil, and also researched the acid pickling process to improve the quality of carbon black by lowering of sulfur and ash.To identify co-pyrolysis of waste tires with coal tar optimum conditions of temperature, the ratio of waste tires with coal tar and the degree of swelling factor of waste tires. Research shows that:(1) coal tar of tires with a strong swelling effect, temperature, surface area and type of tire and other factors have a significant impact, temperature and surface area can be increased to accelerate the swelling process;(2) pure waste tires pyrolysis and co-pyrolysis of waste tires swelling after pretreatment of coal tar, fuel oil yield is increased as the pyrolysis temperature increases, increased 550 ℃ can be identified complete pyrolysis;(3) pure waste tires pyrolysis yield 53.60% of fuel oil and 35.21% of carbon black, when waste tires: coal tar mass ratio is 1:1 without swelling pretreatment directly mixed co-pyrolysis yield 71.65% of fuel oil and 18.63% of carbon black, coal tar swelling pretreatment co-pyrolysis of waste tires up to swelling blance, the fuel oil yield up to 76.18%, the carbon black just 18.63%. By distillation range, chroma, FT-IR and GC-MS analysis fuel oil found that mainly contain the component of benzene, toluene, xylene, naphthalene, etal. At the same time get a total of porous pyrolytic carbon black which is easy smash.Carbon black contain more ash and sulfur components, explore different methods of acid by single factor experiment, the impact of acid concentration, temperature, liquid-solid ratio, stirring speed and stirring time on the lowering of sulfur and ash, and using Orthogonal experiment methods to find the optimal parameters for co-pyrolysis carbon black, temperature 60 ℃, the concentration of hydrochloric acid 2.0mol / L, stirring time 120 min, liquid to solid mass ratio of 10:1. By processing through optimal parameters, the content of ash decreased from 9.25% to 1.88%, the sulfur content also reduced to 0.96% from 2.13%. By microscopy and scanning electron microscopy to observe the surface morphology of carbon black, carbon black particles showed more ellipsoidal and scaly, also owned the rough and porous surface.By "like dissolves" theory to analyze the mechanism of coal tar swelling of tires through computer simulation software to calculate the solubility parameters of coal tar solvent molecule of benzene was 18.5 which is very close to the experimental value 18.7. Meanwhile calculate the diffusion coefficient of coal tar solvent molecules in the rubber molecules. The use of TG / DTG analysis pure waste tires pyrolysis and coal tar swelling pretreatment waste tires co-pyrolysis kinetic parameters, and found that the activation energy respectly was 186 k J/mol and 146 k J/mol, compare the average apparent activation energy of coal tar derived swelling pretreatment total waste tires pyrolysis reactions carried out more easily.