Investigation on thermal dechlorination and catalytic pyrolysis in a continuous process for liquid fuel recovery from mixed plastic wastes
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A continuous system (feeding rate >1 kg/h) consisting of thermal dechlorination pre-treatment and catalytic pyrolysis with Fe-restructured clay (Fe-RC) catalyst was developed for feedstock recycling of PVC-containing mixed plastic waste. The vented screw conveyor which was specially designed for continuous dechlorination was able to achieve dechlorination efficiency of over 90 % with a feedstock retention time longer than 35.5 min. The chlorine content of the pyrolytic oil obtained after dechlorination was in the range of 6.08–39.50 ppm, which meet the specification for reclamation pyrolytic oil in Japan. Fe-RC was found to significantly improve the yield of pyrolytic oil (achieved to 83.73 wt%) at the optimized pyrolysis temperature of 450 °C and catalyst dosage of 60 g. With the optimized parameters, Fe-RC showed high selectivity for the C9–C12 and C13–C19 oil fraction, which are the major constituents of kerosene and diesel fuel, demonstrating that this catalyst can be applied in the pyrolysis of mixed plastic wastes for the production of kerosene and diesel fuel. Overall, the continuous process exhibited high stability and consistently high-oil yield upon reaching steady state, indicating its potential up-scaling application in the industry.
KeywordsThermal dechlorination Catalytic pyrolysis Continuous process Mixed plastic wastes Restructured clay
This research is funded by the National Environment Agency of Singapore under the Environment Technology Research Program (ETRP Grant No.: 1202-109).
- 1.Plastics Europe (2009) The compelling facts about plastics: an analysis of European plastics production, demand and recovery for 2008. Plastics Europe, BrusselsGoogle Scholar
- 2.Plastics Europe (2015) Plastics—the Facts 2015: an analysis of European plastics production, demand and waste data. Plastics Europe, Brussels, Belgium. see http://issuu.com/plasticseuropeebook/docs/finalplasticsthefacts2015ebookwebve/1?e=14847134/31230241
- 3.NEA (2015) Waste statistics and overall recycling: waste statistics and recycling rate for 2014. National Environmental Agency (NEA), Singapore. see http://www.nea.gov.sg/energy-waste/waste-management/waste-statistics-and-overall-recycling
- 4.Anhui Oursun Resource Technology Co., Ltd. see http://www.oursunworld.com/gylc.html. Retrieved 07 April 2016
- 5.Plastic2Oil, Inc. see http://www.plastic2oil.com/site/p2o-technology. Retrieved 07 April 2016
- 6.Moriya S, Watanabe H, Yaginuma R, Matsumoto T, Nakajima M, Tsukada M, Isshiki N (2000) Studied of recycled fuel oil for diesel engine extracted from waste plastics disposals. Energy Conversion Engineering Conference and Exhibit, 35th Intersociety, vol 1, pp 510–515Google Scholar
- 7.Zmuda H (2004) US Patent No. 6,777581. Washington, DC: U.S. Patent and Trademark OfficeGoogle Scholar
- 11.Saito K, Narita H (2001) Studies on the dechlorination and oil-production technology of waste plastics. J Mater Cycles Waste Manag 3:93–98Google Scholar
- 14.Wang JY, Li K, Yang Y, Wee LS, Weerachanchai P, Guoan Y, Junxi L (2015) application of modified pillared clay with transition metals in catalytic pyrolysis (technical disclosure), accorded Singapore provisional application number 10201503425XGoogle Scholar
- 17.Japan Industrial Standard (2004) Pyrolytic oil from waste plastics—boiler fuel and diesel generator fuel. JIS TS Z 0025:2004Google Scholar