The pyrolysis behavior of mixtures of commodity plastics with polyvinyl chloride in a thermogravimetric analyzer

• Autorzy: Heinzel A. , Keener T.C. , Khang S.-J.
• Języki publikacji: EN

Abstrakty

EN

Waste plastics make up approximately 20% of the volume of landifill material and almost, chlorine from the thermal degradation of polyvinyl chloride (PVC) can contaminate 10% of the weight. These products contain substantial energy recovery value, and also represent a potentially valuable source of feedstock raw material for additional plastics production. Controlled pyrolysis offers a method of converting raw, mixed waste plastics back into feedstock grade liquids by the application of heat in the absence of oxygen. However the reclamed liquids making them more difficult and expensive for processing and also produce a corrosive atmosphere which makes processing more expressive. This paper reports on a study of the impact of PVC on the thermal degradation rates other plastics including polypropylene (PP), polystyrene (PS), low-density polyethylene (LDPE), high-density polyethylene (HDPE) and polyethylene terephthalate (PET) in a thermogravimetric analyzer (TGA). Commodity plastics were mixed at various rations with PVC and analyzed by means of their degradation rates to determine the kinetic rate constants which were compared to the rates obtained for the pure plastics. The values of the kinetic parameters for the pure compounds were all very close to, or within the ranges obtained from the literature. The results indicated that the decomposition behavior of the mixtures differend from those of the pure polymers. These deviations were greatest for mixtures of PVC with polyethylene terephthalate where it was determined that the dehydrochlorination step of PVC catalyzes the decomposition of PET. Pyrolysis of mixtures of PVC and polysteryne at temperatures between 2000C and 3500C result in incomplete dehydrochlorination. This results in more chlorinated compounds being released at higher temperatures.

Słowa kluczowe

EN

pyrolysis; waste plastics; thermal degradation

PL

piroliza; rozkład termiczny; odpady mas plastycznych

• Wydawca: Institute of Environmental Engineering, Polish Academy of Sciences
• Czasopismo: Archiwum Ochrony Środowiska
• Rocznik: 2001
• Tom: Vol. 27, no. 3
• Strony: 11--33
• Opis fizyczny: tab., wykr., bibliogr. 19 poz.

Twórcy

autor

Heinzel A.

autor

Keener T.C.

autor

Khang S.-J.

• Bergakademie Freiberg, Institut für Energieverfahrenstechnik und Chemieingenieurwesen, Reiche Zeche , 09-599 Freiberg, Germany