Health & Environmental Research Online (HERO)


Print Feedback Export to File
3579327 
Journal Article 
Analysis of pyrolysis products during thermal decomposition of organic components in ceramic green bodies 
Eusterbrock, L; Lehmann, J; Ziegler, G 
2003 
0 
Ceramic Forum International
ISSN: 0173-9913 
80 
10 
E33-E39 
English 
WOS:000186139900005 
For improved quality and machinability of ceramic green bodies the use of organic additives is necessary. During the debinding process the polymers are thermally decomposed and partially emitted as ecotoxicologically relevant components. The aim of this study was to determine and to quantify these compounds during pyrolysis with the ultimate goal of reducing the emission of undesirable pyrolysis products. Four organic polymers frequently used in ceramics industry were investigated: polyacrylic acid (PAA), polyvinyl alcohol (PVA), polyethylene glycol (PEG) and latex. The decomposition experiments were carried out using a tube furnace. Cylindrical green bodies, mainly Al2O3 but also SiC, containing a common amount of 5 mass % of organic additives were pressed and heated. To gather the different volatile decomposition products, a branched sampling system with different adsorbents was developed. After elution of these adsorbents separation and quantification of the pyrolysis products were performed using GC/MS and HPLC. The main pyrolysis products of the three aliphatic organic additives are low molecular mass aldehydes in particular the potentially carcinogenic. form-, acet-, and crotonaldehyde in the range of mg/g. According to the used polymer, the concentration of aromatic compounds varies over a wide range from mug/g to mg/g. While the pyrolysis of PEG results in nearly undetectable concentrations of aromatics, mono-, di-, and trimers of ethylene glycol, 2-methyl-1,3-dioxolan and 1,4-dioxan are formed in concentrations in the range of mg/g. The formation of the potentially carcinogenic 1,4-dioxan could be of toxicological relevance. 
organic additives; debindering; pyrolysis; flue gas; analysis; environment 
OPPT REs
• OPPT_1,4-Dioxane_C. Engineering
     Data screening total
          Screening: Excluded
• OPPT_1,4-Dioxane_D. Exposure
     Total – title/abstract screening
          Off topic
          Supplemental Search
               Consumer Use
• OPPT_1,4-Dioxane_E. Fate
     Total – title/abstract screening
          Off topic