کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
4413294 | 1307672 | 2009 | 6 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Efficient dehalogenation of automobile shredder residue in NaOH/ethylene glycol using a ball mill Efficient dehalogenation of automobile shredder residue in NaOH/ethylene glycol using a ball mill](/preview/png/4413294.png)
We investigated the effectiveness of sodium hydroxide/ethylene glycol (NaOH/EG) for dehalogenation of automobile shredder residue (ASR) using a ball mill. Efficient dehalogenation was achieved at atmospheric pressure by combining the use of EG (196 °C b.p.) as a replacement solvent for NaOH with ball milling, which improved contact between ASR and OH− in solution. Moderate NaOH concentrations and increased ball mill rotation speeds produced high dechlorination that was not significantly affected by the weight ratio of ASR to EG. NaOH/EG dechlorination increased with temperature with an apparent activation energy of 50 kJ mol−1 confirming that the reaction proceeded under chemical reaction control. The modified shrinking-core model was appropriate to explain the dechlorination process. Low chloro levels in our NaOH/EG-treated ASR suggested that this material could be used for feedstock recycling and the wet process may be applicable for dehalogenation of other important waste streams.
Journal: Chemosphere - Volume 74, Issue 2, January 2009, Pages 287–292