Untersuchungen zur thermischen Zersetzung von Polyvinylchlorid unter dem Einfluss von Metallchloriden
Untersuchungen zur thermischen Zersetzung von Polyvinylchlorid unter dem Einfluss von Metallchloriden
During pyrolytic separation of aluminium from Al/plastics combinations at 600°C aluminium reacts in case of long gas residence times with HCI split off from PVC to form the catalytically active Lewis acid AlCl$_{3}$ with an almost stoichiometric yield. Pyrolysis experiments of different scales - mic...
| Personal Name(s): | Müller, Jürgen (Corresponding author) |
|---|---|
| Contributing Institute: |
Publikationen vor 2000; PRE-2000; Retrocat |
| Imprint: |
Jülich
Forschungszentrum Jülich GmbH Zentralbibliothek, Verlag
1997
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| Physical Description: |
140 p. |
| Document Type: |
Report Book |
| Research Program: |
Addenda |
| Series Title: |
Berichte des Forschungszentrums Jülich
3474 |
| Link: |
OpenAccess OpenAccess |
| Publikationsportal JuSER |
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During pyrolytic separation of aluminium from Al/plastics combinations at 600°C aluminium reacts in case of long gas residence times with HCI split off from PVC to form the catalytically active Lewis acid AlCl$_{3}$ with an almost stoichiometric yield. Pyrolysis experiments of different scales - micropyrolysis (Py-GC, EGA-FTIR ($\mu$g)), thermo analysis (mg), flow and batch reactors (g) - have been run using admixtures ofLewis acids with graded Lewis acidity, namely AlCl$_{3}$, GaCl$_{3}$, FeCl$_{3}$, BiCl$_{3}$, SbCl$_{3}$ und ZnCl$_{2}$, as well as CuCI to investigate systematically the effect of metal chlorides on the thermal decomposition of PVC, particularly on the formation of aromatics, PAH and chlorinated organics. Quantitative analyses of PAH in the condensate and the char were carried out with GC-FID andHPLC/Fluorescence. Methyl-PAH, mainly naphthalenes and at lower concentrations phenanthrenes and anthracenes, were determined with HPLC/UV. Chlorobenzenes and PCB were quantified with GC-EC, dioxins with GC-MS. The yield of char increases with the percentage of metal chlorides approaching fmally a maximum value increasing with Lewis acidity. The yield ofPAH and methyl-PAH, on the other hand, tends nearly exponentially to a minimum value decreasing practically to zero with increasing Lewis acidity. In addition to the thermodynamically stable perchlorinated products as there are hexachlorobenzene and decachlorobiphenyl also pentachlorobenzene and smaller amounts of PCB 206 and 208 as well as polychlorinated dioxins were identified. No significant dependence on the amount of metal chlorides was observed. |