| Summary: | 碩士 === 明志科技大學 === 化工與材料工程研究所 === 96 === In this work, the products and residues of thermal and catalytic degradation of PBT by the different conditions such as temperature, reaction time, the flow rate of carrier gas, particle size, adding different kinds of catalyst and mixing methods of PBT and catalyst were studied by GC/MS, FTIR and EA.
The result shows the weight-loss percentage of PBT for catalytic degradation by adding the copper chloride at 360℃ and the reaction time 30min, the weight ratio of catalyst to PBT is 0.1, is higher than that of thermal degradation at the same condition. As increasing the particle size of PBT and the flow rate of carrier gas decreases the weight-loss percentage of PBT. Effects of temperature and reaction time are obvious than that of particle size of PBT and the flow rate of carrier gas. The mixing method of catalyst and PBT with incipient wetness of impregnation increases the percentage of weight-loss of PBT than by physical mixing. The gas products of thermal degradation of PBT are CO、CO2、Ethane、Ethylene、Propene、Cyclobutane、1-butene、2-butene、1,3-butadiene and butadiene dimer. Comparing the products distribution of thermal degradation and catalytic degradation, the addition of catalyst changes the relative amount of products an keeps the distribution unchanged. The production of derivatives of benzene and naphthalene will also be found to inhibit when PBT was also be found to degrad over metal chlorides.
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