Development of a catalytic cracking process for converting waste plastics to petrochemicals |
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Authors: | Junya Nishino Masaaki Itoh Tadashi Ishinomori Nobuhiko Kubota Yoshio Uemichi |
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Affiliation: | (1) Ishikawajima-Harima Heavy Industries Co. Ltd., 1 Shinnakahara-cho, Isogo-ku, Yokohama, 235-8501, Japan;(2) Muroran Institute of Technology, Muroran, Japan |
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Abstract: | The catalytic degradation of polyolefin using H-gallosilicates was examined using a bench-scale reactor (0.8kg/h) with semicontinuous feeding and the following plastics: (1) low-density polyethylene (LDPE) pellets; (2) linear low-density polyethylene (L-LDPE) pellets; (3) high-density polyethylene (HDPE) pellets; (4) polypropylene (PP) pellets; (5) polyolefin obtained from pulverized industrial waste plastics. The yields of liquid compounds from these materials, which were aromatics in most cases, ranged from 55wt% to 68wt%. With an increase in the ratio of total reactant to catalyst, the liquid yield remained the same. Yields of benzene, toluene, and xylenes (BTXs) decreased rapidly to below 50wt% at a ratio of more than 30. Differences in this ratio for BTXs were always small and were independent of the material. Only about half of the gas product was propane with a fresh catalyst. When the experiments were repeated, propylene, isobutane, and isobutene were found to increase. |
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Keywords: | Waste plastics Polyolefin Catalytic cracking Feedstock recycling Aromatics |
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