Kinetic model of the chemical recycling of waste polyethylene into fuels

N. Miskolczi, L. Bartha, Gy Deák, B. Jóver, D. Kalló

Research output: Contribution to journalArticle

13 Citations (Scopus)

Abstract

Tertiary recycling methods offer potential possibilities for the utilization of waste plastics. Thermal and catalytic degradation of low-density polyethylene wastes were studied in a batch reactor under mild cracking conditions to derive liquid cracking products of olefins and paraffins. Zeolite catalysts with different activities were studied: a commercial equilibrium FCC catalyst, an H form ZSM-5 catalyst, and a natural clinoptilolite containing rhyolite tuff. The catalytic processes could convert waste polymers into valuable hydrocarbons. The properties of products could be modified by the use of catalysts. The olefin content and the position of the olefinic double bonds were investigated with IR spectrometry. In the presence of catalysts the olefin content increased, and the terminal bonds migrated into internal positions. Furthermore the liquid products had lower average molecular weights than those obtained without catalysts. The activation energies of the cracking reactions with or without catalysts were determined. The apparent activation energy was lower in catalytic than that in thermal degradation. The cracking reaction rates were modelled and the reaction rate constant of each hydrocarbon type was calculated. The model gives a good approximation of the experimental results obtained from the degradation of LDPE waste in the presence and absence of catalysts. Under the studied parameters, liquids were formed with suitable properties for further uses (e.g. low sulphur content, low pour point).

Original languageEnglish
Pages (from-to)223-229
Number of pages7
JournalProcess Safety and Environmental Protection
Volume82
Issue number3 B
DOIs
Publication statusPublished - May 2004

Fingerprint

Polyethylene
recycling
Polyethylenes
Recycling
catalyst
kinetics
Catalysts
Kinetics
activation
Alkenes
Olefins
energy
Low density polyethylenes
Hydrocarbons
activation energy
reaction rate
degradation
liquid
Reaction rates
Liquids

Keywords

  • Activation energy
  • Cracking
  • Double bond isomerization
  • Kinetic model
  • Polyethylene waste
  • Reaction rate coefficient

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Safety, Risk, Reliability and Quality
  • Environmental Engineering
  • Safety Research
  • Environmental Chemistry

Cite this

Kinetic model of the chemical recycling of waste polyethylene into fuels. / Miskolczi, N.; Bartha, L.; Deák, Gy; Jóver, B.; Kalló, D.

In: Process Safety and Environmental Protection, Vol. 82, No. 3 B, 05.2004, p. 223-229.

Research output: Contribution to journalArticle

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