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Environ Sci Pollut Res Int

Title:		"Characteristics of exhaust gas, liquid products, and residues of printed circuit boards using the pyrolysis process"
Author(s):		Chiang HL; Lo CC; Ma SY;
Address:		"Department of Health Risk Management, China Medical University, Taichung, 40402, Taiwan. hlchiang@mail.cmu.edu.tw"
Journal Title:		Environ Sci Pollut Res Int
Year:		2010
Volume:		20091006
Issue:		3
Page Number:		624 - 633
DOI:		10.1007/s11356-009-0245-y
ISSN/ISBN:		1614-7499 (Electronic) 0944-1344 (Linking)
Abstract:		"INTRODUCTION: The pyrolytic method was employed to recycle metals and brominated compounds blended into printed circuit boards (PCBs). METHODS: PCBs were crushed into pieces 4.0-4.8 mm in size, and the crushed pieces were pyrolyzed at temperatures ranging from 200 to 500 degrees C. The compositions of pyrolytic residues, liquid products, and exhaust were analyzed by inductively coupled plasma atomic emission spectrometer, inductively coupled plasma mass spectrometry, and gas chromatography-mass spectrometry. Pyrolytic exhaust was collected by an impinger system in an ice bath cooler to analyze the composition fraction of the liquid product, and uncondensable exhaust was collected for gas constituent analysis. RESULTS: Phenol, methyl-phenol, and bromo-phenol were attributed mainly to the liquid product. Metal content was low in the liquid product. In addition, CO, CO(2), CH(4), and H(2) were the major components of pyrolytic exhaust. CONCLUSIONS: Brominated and chlorinated compounds-i.e., dichloromethane, trans-1,2 dichloroethylene, cis-1,2 dichloroethylene, 1,1,1-trichloroethane, tetrachloromethane, bromophenol, and bromoform-could be high, up to the several parts per million (ppm) level. Low molecular weight volatile organic compounds (VOCs)-i.e., methanol, acetone, ethyl acetate, acrylonitrile, 1-butene, propene, propane, and n-butane-contributed a large fraction of VOCs. The concentrations of toluene, benzene, xylene, ethylbenzene, and styrene were in the ppm range"
Keywords:		Atmosphere/chemistry *Electrical Equipment and Supplies Environmental Pollutants/analysis/*chemistry Incineration/*methods Industrial Waste/*analysis Kinetics Volatile Organic Compounds/analysis/*chemistry;
Notes:		"MedlineChiang, Hung-Lung Lo, Cho-Ching Ma, Sen-Yi eng Germany 2009/10/07 Environ Sci Pollut Res Int. 2010 Mar; 17(3):624-33. doi: 10.1007/s11356-009-0245-y. Epub 2009 Oct 6"