Brems, Anke, Baeyens, Jan, Vandecasteele, Carlo and Dewil, Raf (2011) Polymeric cracking of waste polyethylene terephthalate to chemicals and energy. Journal of the Air & Waste Management Association, Vol.61 (No.7). pp. 721-731. ISSN 1096-2247

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Abstract

Polyethylene terephthalate (PET) is a widely used thermoplastic. PET residues represent on average 7.6 wt% of the different polymer wastes in Europe. Pyrolysis of these wastes is attracting increasing interest, and PET is a potential candidate for this thermal process. The paper measures and discusses the kinetics of the pyrolysis reaction in terms of the reaction rate constants as determined by dynamic thermogravimetric analysis, with special emphasis on the required heating rate to obtain relevant results. The product yields and compositions are also determined. Gaseous products represent 16-18 wt%. The amounts of condensables and carbonaceous residue are a function of the operating mode, with slow pyrolysis producing up to 24 wt% of carbonaceous residue. Major condensable components are benzoic acid, monovinyl terephthalate, divinyl terephthalate, vinyl benzoate, and benzene. The present paper complements previous literature findings by (1) the study of the influence of the heating rate on the reaction kinetics in dynamic pyrolysis tests, (2) the isothermal investigation in a fluidized bed reactor to pyrolyze PET, and (3) the assessment of upgrading and recovery of the products. The paper concludes with a proposed reactor recommendation for PET pyrolysis, in either the bubbling or circulating fluidized bed operating mode.

Item Type:	Journal Item
Subjects:	T Technology > TD Environmental technology. Sanitary engineering T Technology > TP Chemical technology
Divisions:	Faculty of Science > Engineering
Library of Congress Subject Headings (LCSH):	Polyethylene terephthalate, Glycolysis
Journal or Publication Title:	Journal of the Air & Waste Management Association
Publisher:	Air & Waste Management Association
ISSN:	1096-2247
Official Date:	July 2011
Volume:	Vol.61
Number:	No.7
Page Range:	pp. 721-731
Identification Number:	10.3155/1047-3289.61.7.721
Status:	Peer Reviewed
Publication Status:	Published
Access rights to Published version:	Restricted or Subscription Access
URI:	http://wrap.warwick.ac.uk/id/eprint/39058

Data sourced from Thomson Reuters' Web of Knowledge

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