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Study on Salt-Bath Pyrolysis of Waste Tires

Author: WangXueTong
Tutor: ZhangMinQing
School: Hebei University of Technology
Course: Chemical processes
Keywords: Waste tires Pyrolysis Salt bath Mechanism Lumping kinetic
CLC: X705
Type: Master's thesis
Year: 2008
Downloads: 196
Quote: 1
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Abstract


One hand , the development of the rubber industry to promote industrial development and the improvement of people's living standards , the other hand it causes the black pollution problems have become increasingly prominent , serious damage to the environment . Using pyrolysis liquefaction way to deal with discarded tires , not only to eliminate the black pollution , protect the environment and its pyrolysis products can be recycled , to meet the requirements of the recycling economy . Proposed new technology of molten zinc chloride salt bath heat carrier pyrolysis waste tire recycling fuel oil , tire grain as raw materials , systematic studies of the normal high temperature pyrolysis , the salt bath pyrolysis tire pyrolysis characteristics the obtained the salt bath pyrolysis reaction optimum temperature range of 480 to 520 ° C , the salt ratio of 1:1 , the tire 16 mesh particles , the carrier gas flow rate of 80ml/min . Established a complete set of gas chromatography using an internal standard for the salt bath pyrolysis gas, liquid product , color - qualitative analysis method . Highest methane content in the gaseous product , and up to 49.25% ; high content of aromatics and aliphatic hydrocarbons in the liquid product , wherein the light oil aromatic hydrocarbons of benzene, toluene , xylene and the high content of aliphatic hydrocarbons , olefins accounts for more than 70% ; coke in particle size and dispersibility in the solid phase product produced by the different reaction temperatures there are significant differences. Low temperatures reunion coalescence is more serious , the larger particle size . As the reaction temperature increases , the thermal cracking for a more thorough dispersion of gradually increasing the particle diameter becomes smaller . The salt bath pyrolysis process , the presence of free radicals and carbonium ion mechanism of two reactions . Reasonable simplifying assumptions , including tire particles , gas products , liquid products , oil , coke and intermediate reaction network and lumped kinetic model for the pyrolysis of tires salt bath model parameters analytical and numerical solutions . Through the comparison of the experimental data with the model calculated , to verify the reliability and accuracy of the model . Meanwhile, the application prospect of pyrolysis oil fractions make a simple analysis and discussion , to enterprises to improve the economic value of the pyrolysis products .

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CLC: > Environmental science, safety science > Processing and comprehensive utilization of waste > General issues > Solid waste disposal and utilization
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