Feasibility study of the separation of chlorinated films from plastic packaging wastes |
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| Authors: | Mallampati Srinivasa Reddy Takefumi Yamaguchi Tetsuji Okuda Tsung-Yueh Tsai Satoshi Nakai Wataru Nishijima Mitsumasa Okada |
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| Institution: | 1. Department of Chemical Engineering, Graduate School of Engineering, Hiroshima University, 1-4-1 Kagamiyama, Higashi-Hiroshima, Hiroshima-739-8527, Japan;2. Environmental Research and Management Center, Hiroshima University, 1-5-3 Kagamiyama, Higashi-Hiroshima, Hiroshima-739-8513, Japan;1. State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-environmental Sciences, Chinese Academy of Sciences, P.O. Box 2871, Beijing 100085, China;2. Ausenco LTD, Beijing 100027, China;1. Department of Physics, Shaoxing University, Shaoxing, Zhejiang 312000, China;2. College of Physics and Electronic Information, China West Normal University, Nanchong, Sichuan 637002, China;1. School of Chemical Engineering, Oklahoma State University, 423 Engineering North, Stillwater, OK 74078, United States;2. Department of Chemical and Biomolecular Engineering, Rice University, 6100 S. Main St., MS 362, Houston, TX 77005, United States;3. Chevron Energy Technology Company, 1400 Smith St., Houston, TX 77002, United States |
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| Abstract: | This study describes the possible separation of chlorinated plastic films (PVC and PVDC) from other heavy plastic packaging waste (PPW) by selective twist formation and gravity separation. Twists formation was mechanically induced in chlorinated plastic films, whereas twist formation did not occur in PS and PET films. After twist formation, all the films had the apparent density of less than 1.0 g/cm3 and floated in water even though the true density was more than 1.0 g/cm3. However, the apparent density of the PS and the PET films increased with agitation to more than 1.0 g/cm3, whereas that of chlorinated plastic films was kept less than 1.0 g/cm3. The main reason would be the air being held inside the chlorinated plastic films which was difficult to be removed by agitation. Simple gravity separation after twist formation was applied for artificial film with 10 wt.% of the chlorinated films and real PPW films with 9 wt.% of the chlorinated films. About 76 wt.% of the artificial PPW films and 75 wt.% of real PPW films after the removal of PP and PE were recovered as settling fraction with 4.7 wt.% and 3.0 wt.% of chlorinated plastic films, respectively. These results indicate that simple gravity separation process after twist formation can be used to reduce the chlorinated plastic concentration from mixed heavy PPW films. |
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