Formation of octachloroacenaphthylene in the pyrolysis of decachlorobiphenyl

Bleise, A.; Kleist, E.; Günther, Klaus; Schwuger, M. J.

doi:10.1016/s0045-6535(97)00110-0

Cited by 4 publications

(2 citation statements)

References 19 publications

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“…The reaction medium, dichlorobenzene or trichlorobenzene, can form tetra-, penta-, and/or hexa- PCB congeners by a reaction with each other under heat through a free radical mechanism (the dashed arrow pathway in Figure 3 ) ( 24 , 25 ). The resulting PCB congeners may thermally degrade further into lower chlorinated congeners by the same mechanism ( 26 ). Mono- through tetra-chlorobiphenyls have been created through a free radical mechanism from pyrolysis and combustion of other chlorinated organics at temperatures ranging from 300 to 700 °C ( 27 ).…”

Section: Resultsmentioning

confidence: 99%

Inadvertent Polychlorinated Biphenyls in Commercial Paint Pigments

Hornbuckle

2009

Environ. Sci. Technol.

318

314

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A polychlorinated biphenyl (PCB) that was not produced as part of the Aroclor mixtures banned in the 1980s was recently reported in air samples collected in Chicago, Philadelphia, the Arctic, and several sites around the Great Lakes. In Chicago, the congener 3,3′-dichlorobiphenyl or PCB11 was found to be the fifth most concentrated congener and ubiquitous throughout the city. The congener exhibited strong seasonal concentration trends that suggest volatilization of this compound from common outdoor surfaces. Due to these findings and also the compound’s presence in waters that received waste from paint manufacturing facilities, we hypothesized that PCB11 may be present in current commercial paint. In this study we measured PCBs in paint sold on the current retail market. We tested 33 commercial paint pigments purchased from three local paint stores. The pigment samples were analyzed for all 209 PCB congeners using gas chromatography with tandem mass spectrometry (GC-MS/MS). More than 50 PCB congeners including several dioxin-like PCBs were detected, and the PCB profiles varied due to different types of pigments and different manufacturing processes. PCB congeners were detected in azo and phthalocyanine pigments which are commonly used in paint but also in inks, textiles, paper, cosmetics, leather, plastics, food and other materials. Our findings suggest several possible mechanisms for the inadvertent production of specific PCB congeners during the manufacturing of paint pigments.

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Section: Resultsmentioning

confidence: 99%

Inadvertent Polychlorinated Biphenyls in Commercial Paint Pigments

Hornbuckle

2009

Environ. Sci. Technol.

318

314

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“…Figure (middle curve) showed that the 10-CB had been hydrolyzed according to the C−H bond stretch at 3060 cm -1 and an O−H bond stretch at 3533 cm -1 . The bands from 2800 to 3700 cm -1 are for the Y−H (Y = C, O, N) stretch vibrations; characteristic stretch bands for aromatic C−H and O−H are at 3000−3100 and 3400−3700 cm -1 , respectively …”

Section: Resultsmentioning

confidence: 99%

Destruction of Decachlorobiphenyl Using Supercritical Water Oxidation

Fang

Butler

et al. 2004

Energy Fuels

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A microreactor (50-nL), batch reactors (6-mL), and a flow reactor (11.3-mL) were used to study the oxidation of decachlorobiphenyl (10-CB) in supercritical water. In the microreactor experiments, it was found that complete dissolution of 10-CB occurred at excess O2 (>93%) and that both hydrolysis and oxidation contributed to 10-CB destruction. In experiments performed with the batch reactors, at excess O2, 99.2% and 100% 10-CB could be destroyed in SCW without and with Na2CO3, respectively. Addition of the neutralization agent Na2CO3 promoted the destruction rate and reduced reactor corrosion significantly. A reaction mechanism for 10-CB destruction was proposed and this was examined further in flow experiments, where we found that 100% destruction could be achieved.

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