A kinetic study of the decross-linking of cross-linked polyethylene in supercritical methanol

Hong shik Lee, Ju Hyeong Jeong, Hang Kyu Cho, Chong Min Koo, Soon Man Hong, Hwayong Kim, Youn Woo Lee

Research output: Contribution to journalArticle

27 Citations (Scopus)

Abstract

The recycling of cross-linked polyethylene (XLPE) by a decross-linking reaction in supercritical methanol was studied using a batch reactor. XLPEs with initial gel contents of 45, 55 and 65% were employed and subjected to reaction temperatures between 320 and 360 °C. Complete decross-linking of XLPE was achieved in 10 min in supercritical methanol at 360 °C and 15 MPa. For the first time, chemical kinetics for the decross-linking reaction is proposed based on the gel concentration, and applicable to the reactor design. With respect to the gel concentration, the first-order reaction model agreed well with the experimental results. The evaluated kinetic constant was 0.0867 ± 0.0082 cm3/mg min at 350 °C, and the activation energy was 578 ± 25 kJ/mol.

Original languageEnglish
Pages (from-to)2084-2088
Number of pages5
JournalPolymer Degradation and Stability
Volume93
Issue number12
DOIs
Publication statusPublished - 2008 Dec 1
Externally publishedYes

Fingerprint

Polyethylene
Methanol
Polyethylenes
polyethylenes
Gels
methyl alcohol
Kinetics
kinetics
gels
Batch reactors
Reaction kinetics
reactor design
Recycling
Activation energy
recycling
reaction kinetics
reactors
activation energy
Temperature
temperature

Keywords

  • Cross-linked polyethylene
  • Decross-linking
  • Kinetics
  • Recycling
  • Supercritical methanol

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Mechanics of Materials
  • Polymers and Plastics
  • Materials Chemistry

Cite this

A kinetic study of the decross-linking of cross-linked polyethylene in supercritical methanol. / Lee, Hong shik; Jeong, Ju Hyeong; Cho, Hang Kyu; Koo, Chong Min; Hong, Soon Man; Kim, Hwayong; Lee, Youn Woo.

In: Polymer Degradation and Stability, Vol. 93, No. 12, 01.12.2008, p. 2084-2088.

Research output: Contribution to journalArticle

Lee, Hong shik ; Jeong, Ju Hyeong ; Cho, Hang Kyu ; Koo, Chong Min ; Hong, Soon Man ; Kim, Hwayong ; Lee, Youn Woo. / A kinetic study of the decross-linking of cross-linked polyethylene in supercritical methanol. In: Polymer Degradation and Stability. 2008 ; Vol. 93, No. 12. pp. 2084-2088.
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AU - Kim, Hwayong

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