Journal
JOURNAL OF HAZARDOUS MATERIALS
Volume 344, Issue -, Pages 333-342Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jhazmat.2017.10.033
Keywords
Waste PCBs; Oil phase product; Debromination; Critical water-alcohol composite medium
Categories
Funding
- National Natural Science Foundation of China [21605018, 21377104]
- Program for New Century Excellent Talents in Fujian Province University
- Natural Science Foundation of Fujian Province of China [2015J01034, 2017J01472]
- Science & Technology Pillar Program of Sichuan Province [2014ZZ0035]
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Critical water system used for decomposition and debromination of waste printed circuit board (PCBs) has two disadvantages: low value-added oil phase products and halfway debromination at low temperature condition. In this study, critical water-alcohol composite medium was found to be a promising method to surmount these disadvantages. Critical water-ethanol (CWE) and critical water-methanol (CWM) were selected as the composite medium. The temperature of CWE and CWM had a significant effect on the oil phase composition. At low temperature CWE/CWM of 300 degrees C, 4-(1-methylethyl)-phenol with high concentration could be recovered. CWM of 400 degrees C was beneficial to the generation of ether compounds and high level of anisole could be obtained, while 450 degrees C was beneficial to the generation of high level of multi-alkyl substituted phenol derivatives or benzene derivatives such as p-xylene. Br-free oil phase products could be obtained when the temperature of CWE/CWM >= 300 degrees C. Different oil phase products with high level of chemicals or chemical intermediates could be obtained by controlling the reaction conditions of CWE/CWM. It is believed that the additional value-of the oil phase products derived from waste PCBs can be greatly improved by this new process. (C) 2017 Elsevier B.V. All rights reserved.
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