Pyrolysis Kinetics and Products of Tetra Packs in Nitrogen

• Main Authors: Chang, Hua-Shan, 張華珊
• Other Authors: Chang Ching-Yuan
• Format: Others
• Language: zh-TW
• Published: 1998
• Online Access: http://ndltd.ncl.edu.tw/handle/71474446148179389352

碩士 === 國立臺灣大學 === 環境工程學研究所 === 86 === The object of this research is to investigate the pyrolysis kinetics and products of tetra packs in nitrogen. The tetra packs, kraft papers and LDPE ( low-density polyethylene ), the main components of tetra pack, were pyrolyzed in nitrogen at the heating rates of 5.2, 12.8, 21.8 K/min, and the pyrolysis kinetic model of tetra packs was built up. For the product analysis, tetra packs were pyrolyzed at the heating rate of 5.2 K/min, and the solid residues and gaseous products were collected and analyzed. The results indicate that the variation of residual mass fraction of tetra pack pyrolysis consisted of three distinct stages. The first stage was contributed by the primary reaction of kraft paper. Pyrolysis reaction of LDPE and the secondary reaction of kraft paper were significant in the second stage. The third stage was only contributed by the secondary reaction of kraft paper. The one-reaction model and two-reaction model could describe the pyrolysis behavior of LDPE and kraft paper, respectively. T In the part of product analysis, the aluminum foil in the final residues was analyzed by XRPD ( X-ray powdered diffraction ), and the results indicate that the aluminum foil in the final residues was pure aluminum. The results evaluate the recovery value of aluminum foil. The main gaseous products were CO2 and HCx, and the HCx consisted of low molecular paraffin and olefin ( C1~5 ), which were higher heating value gases. The temperature range corresponding to the maximum CO2 concentration was during 575