Vacuum pyrolysis of commingled plastics containing PVC - I. Kinetic study

Citation
R. Miranda et al., Vacuum pyrolysis of commingled plastics containing PVC - I. Kinetic study, POLYM DEGR, 72(3), 2001, pp. 469-491
Citations number
73
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Organic Chemistry/Polymer Science
Journal title
POLYMER DEGRADATION AND STABILITY
ISSN journal
0141-3910 → ACNP
Volume
72
Issue
3
Year of publication
2001
Pages
469 - 491
Database
ISI
SICI code
0141-3910(2001)72:3<469:VPOCPC>2.0.ZU;2-4
Abstract
Thermal decomposition of commingled plastics comprising high and low densit y polyethylene, polystyrene, polypropylene and poly(vinyl chloride) was inv estigated under vacuum conditions by dynamic thermogravimetric analysis in the temperature range of 25-600 degreesC. The mixtures were representative of the major polymeric materials found in a municipal plastic waste (MPW) s tream. The study focused on the role of each polymer in the stabilization o r destabilization of other interacting plastics, as well as the fate of chl orine produced from PVC. First, the decomposition of each single plastic wa s investigated. Then the binary combination of all above polymers and final ly the multicomponent mixture similar to a MPW sample were studied. Two app roaches have been applied to study the interaction between components in th e commingled plastics. The first approach involved a comparison of the expe rimental curve of the decomposition of the mixture with a calculated non-in teracting component decomposition curve based on the behavior of the indivi dual polymers. The second approach involved a comparison of the kinetic par ameters of each plastic in the mixture as determined by two different metho ds: (1) fitting the single polymer decomposition curve and (2) fitting the peak corresponding to the pyrolysis of one particular polymer on the mixtur e pyrolysis curve. The results obtained indicate that some interactions occ urred during MPW pyrolysis, mainly at high temperatures (> 375 degreesC), P S and PVC appear to be the plastics responsible for the interactions throug h their intermediate pyrolysis products. The chlorine from PVC in the mixtu re is released almost completely before 375 degreesC, when the conversion o f the MPW to pyrolysis products has reached ca. 13%. (C) 2001 Elsevier Scie nce Ltd. All rights reserved.