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Korean Journal of Chemical Engineering

, Volume 23, Issue 2, pp 209–215 | Cite as

A comparative study of liquid product on non-catalytic and catalytic degradation of waste plastics using spent FCC catalyst

  • Kyong-Hwan LeeEmail author
  • Dae-Hyun Shin
Article

Abstract

Non-catalytic and catalytic degradation of waste plastics (high-density polyethylene (HDPE), low-density polyethylene (LDPE), polypropylene (PP) and polystyrene (PS)) using spent fluid catalytic cracking (FCC) catalyst into liquid product were comparatively studied with a stirred semi-batch reactor at 400 ‡C, under nitrogen stream. Liquid product characteristics were described by cumulative distribution as a function of lapse time of reaction, paraffin, olefin, naphthene and aromatic (PONA) composition, and also carbon number distribution on plastic type of reactant. For degradation of waste PE with relatively high degradation temperature, the effect of adding spent FCC catalyst greatly appeared on cumulative distribution of liquid product with a reaction lapse time, whereas those for waste PP and PS with low degradation temperature showed a similar trend in both non-catalytic and catalytic degradation at 400 ‡C. In PONA and carbon number distribution of liquid product, the characteristics of waste PS that was mainly degraded by end chain scission mechanism were not much altered in presence of spent FCC catalyst. However, waste polyolefinic polymer that was degraded by a random chain scission mechanism significantly differed on PONA and carbon number distribution of liquid product with or without spent FCC catalyst. The addition of spent FCC catalyst in degradation of polyolefinic polymer, which economically has a benefit in utilization of waste catalyst, significantly improved the light olefin product by its high cracking ability and also the aromatic product by cyclization of olefin as shape selectivity in micropore of catalyst.

Key words

Non-catalytic Degradation Catalytic Degradation Spent FCC Catalyst Waste Plastic Type Characteristics of Liquid Product 

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References

  1. Aguado, J., Serrano, D. P., Escola, J. M. and Garagorri, E., “Catalytic conversion of low-density polyethylene using a continuous screw kilnreactor,”Catalysis Today,75, 257 (2002).CrossRefGoogle Scholar
  2. Cha, W. S., Kim, S. B. and McCoy, B. J., “Study of polystyrene degradation using continuous distribution kinetics in a bubbling reactor,”Korean J. Chem. Eng.,19, 239 (2002).CrossRefGoogle Scholar
  3. Demirbas, A., “Pyrolysis of municipal plastic wastes for recovery of gasoline-range hydrocarbon,”J. Anal. Appl. Pyrol.,72, 97 (2004).CrossRefGoogle Scholar
  4. Ding, W., Liang, J. and Anderson, L. L., “Thermal and catalytic degradation of high density polyethylene and commingled post-consumer plastic waste,”Fuel Processing Technology,51, 47 (1997).CrossRefGoogle Scholar
  5. Lee, K.-H. and Shin, D.-H., “Catalytic degradation of waste HDPE over acidic catalysts with different pore sizes,”J. Ind. Eng. Chem.,9(5), 584(2003).Google Scholar
  6. Lin, Y.-H., Yang, M.-H., Yeh, T.-F. and Ger, M.-D., “Catalytic degradation of high density polyethylene over mesoporous and microporous catalysts in a fluidized-bed reactor,”Polym. Degrad. Stab.,86, 121 (2004).CrossRefGoogle Scholar
  7. Marcilla, A., Gomez, A., Reyes-Labarta, J. A. and Giner, A., “Kinetic study of polypropylene pyrolysis using ZSM-5 and an equilibrium fluid catalytic cracking catalyst,”J. Anal. Appl. Pyrol.,68-69, 467 (2003).CrossRefGoogle Scholar
  8. Miskolczi, N., Bartha, L., Deak, G. and Jover, B., “Thermal degradation of municipal plastic waste for production of fuel-like hydrocarbons,”Polym. Degrad. Stab.,86, 357 (2004).CrossRefGoogle Scholar
  9. Seo, Y.-H., Lee, K.-H. and Shin, D.-H., “Investigation of catalytic degradation of high-density polyethylene by hydrocarbon group type analysis,”J. Anal. Appl. Pyrol.,70, 383 (2003).CrossRefGoogle Scholar
  10. Serrano, D. P., Aguado, J., Escola, J. M. and Garagorri, E., “Performance of a continuous screw kiln reactor for the thermal and catalytic conversion of polyethylene-lubricating oil base mixtures,”Appl. Catal. B,44, 95 (2003).CrossRefGoogle Scholar
  11. Vitolo, S., Bresci, B., Seggiani, M. and Gallo, M. G., “Catalytic upgrading of pyrolytic oils over HZSM-5 zeolite: behaviour of the catalyst when used in repeated upgrading-regenerating cycles,”Fuel,80, 17 (2001).CrossRefGoogle Scholar

Copyright information

© Korean Institute of Chemical Engineering 2006

Authors and Affiliations

  1. 1.Energy Conversion Research DepartmentKorea Institute of Energy ResearchDaejeonKorea

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