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Title: Pyrolysis of polyolefins for increasing the yield of monomers' recovery

Abstract

Highlights: Black-Right-Pointing-Pointer Thermal and catalytic pyrolysis of mixed polyolefins in fluidized bed has been studied. Black-Right-Pointing-Pointer We tested applicability of a commercial Ziegler-Natta catalyst (Z-N: TiCl{sub 4}/MgCl{sub 2}). Black-Right-Pointing-Pointer The catalyst has a strong influence on product distribution, increasing gas fraction. Black-Right-Pointing-Pointer At 650 Degree-Sign C the monomer generation increased by 55% when the catalyst was used. Black-Right-Pointing-Pointer We showed the concept of treatment of mixed polyolefins without a need of separation. - Abstract: Pyrolysis of plastic waste is an alternative way of plastic recovery and could be a potential solution for the increasing stream of solid waste. The objective of this work was to increase the yield the gaseous olefins (monomers) as feedstock for polymerization process and to test the applicability of a commercial Ziegler-Natta (Z-N): TiCl{sub 4}/MgCl{sub 2} for cracking a mixture of polyolefins consisted of 46% wt. of low density polyethylene (LDPE), 30% wt. of high density polyethylene (HDPE) and 24% wt. of polypropylene (PP). Two sets of experiments have been carried out at 500 and 650 Degree-Sign C via catalytic pyrolysis (1% of Z-N catalyst) and at 650 and 730 Degree-Sign C via only-thermal pyrolysis. These experiments have been conducted in a lab-scale, fluidized quartz-bed reactormore » of a capacity of 1-3 kg/h at Hamburg University. The results revealed a strong influence of temperature and presence of catalyst on the product distribution. The ratios of gas/liquid/solid mass fractions via thermal pyrolysis were: 36.9/48.4/15.7% wt. and 42.4/44.7/13.9% wt. at 650 and 730 Degree-Sign C while via catalytic pyrolysis were: 6.5/89.0/4.5% wt. and 54.3/41.9/3.8% wt. at 500 and 650 Degree-Sign C, respectively. At 650 Degree-Sign C the monomer generation increased by 55% up to 23.6% wt. of total pyrolysis products distribution while the catalyst was added. Obtained yields of olefins were compared with the naphtha steam cracking process and other potentially attractive processes for feedstock generation. The concept of closed cycle material flow for polyolefins has been discussed, showing the potential benefits of feedstock recycling in a plastic waste management.« less

Authors:
 [1];  [2];  [3];  [1]
  1. Royal Institute of Technology, School of Industrial Engineering and Management, Division of Energy and Furnace Technology, Brinellvagen 23, 100-44 Stockholm (Sweden)
  2. University of Hamburg, Institute of Technical and Macromolecular Chemistry, Martin-Luther-King Platz 6, 20146 Hamburg (Germany)
  3. State University of Campinas - UNICAMP, College of Chemical Engineering, Department of Polymer Science - Av. Albert Einstein 13083-852 Campinas (Brazil)
Publication Date:
OSTI Identifier:
21612964
Resource Type:
Journal Article
Resource Relation:
Journal Name: Waste Management; Journal Volume: 32; Journal Issue: 5; Other Information: DOI: 10.1016/j.wasman.2011.10.009; PII: S0956-053X(11)00468-5; Copyright (c) 2011 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
38 RADIATION CHEMISTRY, RADIOCHEMISTRY, AND NUCLEAR CHEMISTRY; ALKENES; CATALYSTS; CRACKING; DENSITY; FLUIDIZED BEDS; MAGNESIUM CHLORIDES; MONOMERS; PLASTICS; POLYETHYLENES; POLYMERIZATION; POLYPROPYLENE; PYROLYSIS PRODUCTS; QUARTZ; RECYCLING; SOLID WASTES; SOLIDS; STEAM; TEMPERATURE DEPENDENCE; TITANIUM CHLORIDES; WASTE MANAGEMENT; ALKALINE EARTH METAL COMPOUNDS; CHEMICAL REACTIONS; CHLORIDES; CHLORINE COMPOUNDS; DECOMPOSITION; HALIDES; HALOGEN COMPOUNDS; HYDROCARBONS; MAGNESIUM COMPOUNDS; MAGNESIUM HALIDES; MANAGEMENT; MATERIALS; MINERALS; ORGANIC COMPOUNDS; ORGANIC POLYMERS; OXIDE MINERALS; PETROCHEMICALS; PETROLEUM PRODUCTS; PHYSICAL PROPERTIES; POLYMERS; POLYOLEFINS; PYROLYSIS; SYNTHETIC MATERIALS; THERMOCHEMICAL PROCESSES; TITANIUM COMPOUNDS; TITANIUM HALIDES; TRANSITION ELEMENT COMPOUNDS; WASTES

Citation Formats

Donaj, Pawel J., E-mail: pawel@mse.kth.se, Kaminsky, W., Buzeto, F., and Yang, W. Pyrolysis of polyolefins for increasing the yield of monomers' recovery. United States: N. p., 2012. Web. doi:10.1016/j.wasman.2011.10.009.
Donaj, Pawel J., E-mail: pawel@mse.kth.se, Kaminsky, W., Buzeto, F., & Yang, W. Pyrolysis of polyolefins for increasing the yield of monomers' recovery. United States. doi:10.1016/j.wasman.2011.10.009.
Donaj, Pawel J., E-mail: pawel@mse.kth.se, Kaminsky, W., Buzeto, F., and Yang, W. Tue . "Pyrolysis of polyolefins for increasing the yield of monomers' recovery". United States. doi:10.1016/j.wasman.2011.10.009.
@article{osti_21612964,
title = {Pyrolysis of polyolefins for increasing the yield of monomers' recovery},
author = {Donaj, Pawel J., E-mail: pawel@mse.kth.se and Kaminsky, W. and Buzeto, F. and Yang, W.},
abstractNote = {Highlights: Black-Right-Pointing-Pointer Thermal and catalytic pyrolysis of mixed polyolefins in fluidized bed has been studied. Black-Right-Pointing-Pointer We tested applicability of a commercial Ziegler-Natta catalyst (Z-N: TiCl{sub 4}/MgCl{sub 2}). Black-Right-Pointing-Pointer The catalyst has a strong influence on product distribution, increasing gas fraction. Black-Right-Pointing-Pointer At 650 Degree-Sign C the monomer generation increased by 55% when the catalyst was used. Black-Right-Pointing-Pointer We showed the concept of treatment of mixed polyolefins without a need of separation. - Abstract: Pyrolysis of plastic waste is an alternative way of plastic recovery and could be a potential solution for the increasing stream of solid waste. The objective of this work was to increase the yield the gaseous olefins (monomers) as feedstock for polymerization process and to test the applicability of a commercial Ziegler-Natta (Z-N): TiCl{sub 4}/MgCl{sub 2} for cracking a mixture of polyolefins consisted of 46% wt. of low density polyethylene (LDPE), 30% wt. of high density polyethylene (HDPE) and 24% wt. of polypropylene (PP). Two sets of experiments have been carried out at 500 and 650 Degree-Sign C via catalytic pyrolysis (1% of Z-N catalyst) and at 650 and 730 Degree-Sign C via only-thermal pyrolysis. These experiments have been conducted in a lab-scale, fluidized quartz-bed reactor of a capacity of 1-3 kg/h at Hamburg University. The results revealed a strong influence of temperature and presence of catalyst on the product distribution. The ratios of gas/liquid/solid mass fractions via thermal pyrolysis were: 36.9/48.4/15.7% wt. and 42.4/44.7/13.9% wt. at 650 and 730 Degree-Sign C while via catalytic pyrolysis were: 6.5/89.0/4.5% wt. and 54.3/41.9/3.8% wt. at 500 and 650 Degree-Sign C, respectively. At 650 Degree-Sign C the monomer generation increased by 55% up to 23.6% wt. of total pyrolysis products distribution while the catalyst was added. Obtained yields of olefins were compared with the naphtha steam cracking process and other potentially attractive processes for feedstock generation. The concept of closed cycle material flow for polyolefins has been discussed, showing the potential benefits of feedstock recycling in a plastic waste management.},
doi = {10.1016/j.wasman.2011.10.009},
journal = {Waste Management},
number = 5,
volume = 32,
place = {United States},
year = {Tue May 15 00:00:00 EDT 2012},
month = {Tue May 15 00:00:00 EDT 2012}
}