75627-02-0

Basic information

• Product Name: 1,2,4,6,7,9-HXCDF
• Synonyms: 1,2,4,6,7,9-HXCDF;1,2,4,6,7,9-HEXACHLORODIPHENYLENEOXIDE;1,2,4,6,7,9-Hexachlorodibenzofuran
• CAS NO: 75627-02-0
• Molecular Formula: C12H2 Cl6 O
• Molecular Weight: 374.86
• Mol File: 75627-02-0.mol

Chemical Properties

• Boiling Point: 469.8°C at 760 mmHg
• Flash Point: 237.9°C
• Appearance: /
• Density: 1.766g/cm³
• Vapor Pressure: 1.51E-08mmHg at 25°C
• Refractive Index: 1.717
• CAS DataBase Reference: 1,2,4,6,7,9-HXCDF(CAS DataBase Reference)
• NIST Chemistry Reference: 1,2,4,6,7,9-HXCDF(75627-02-0)
• EPA Substance Registry System: 1,2,4,6,7,9-HXCDF(75627-02-0)

Safety Data

• Hazardous Substances Data: 75627-02-0(Hazardous Substances Data)

Usage

Family

Polychlorinated dibenzofurans (PCDFs)

Formation

Byproduct of industrial processes (waste incineration, chemical manufacturing)

Toxicity

Highly toxic

Persistence

Environmental pollutant

Health effects

Carcinogenic, reproductive and developmental disorders, immune system disruption, thyroid dysfunction

Bioaccumulation

Bioaccumulates in the food chain

Harmful to

Aquatic and terrestrial organisms

Regulation

Production and release are heavily regulated worldwide

InChI:InChI=1/C12H2Cl6O/c13-3-1-5(15)10(18)12-7(3)8-9(17)4(14)2-6(16)11(8)19-12/h1-2H

Relevant articles and documents

Role of copper chloride in the formation of polychlorinated dibenzo-p-dioxins and dibenzofurans during incineration

Combustion experiments in a laboratory-scale fluidized-bed reactor were performed to elucidate the role of copper chloride in formation of polychlorinated dibenzo-p-dioxins (PCDDs) and dibenzofurans (PCDFs) during model waste incineration. The amounts of PCDDs and PCDFs formed, the homologue profiles, and the isomer distributions were measured in the flue gas from incineration of model wastes containing various levels of copper. A correlation was found between the Cu content of the waste and the proportion of each congener. An increase in copper enhanced the formation of certain congeners, showing that copper acts as a catalyst for formation of PCDDs and PCDFs. An increase in the copper content of the waste decreased the CO concentration in the flue gas and reduced the formation of PCDDs and PCDFs during incineration. This indicates that copper also works as an oxidation catalyst to promote combustion, leading to lower concentrations of products of incomplete combustion. It is indispensable to consider both roles of the catalyst, i.e., enhancement and suppression, in the formation of PCDDs and PCDFs during waste incineration, which are estimated separately from the isomer distributions and the amounts of PCDDs and PCDFs formed.

Isomer distributions of polychlorinated dibenzo-p-dioxins/dibenzofurans formed during de novo synthesis on incinerator fly ash

Polychlorinated dibenzo-p-dioxins (PCDD) and dibenzofurans (PCDF) emitted from municipal waste incinerators appear to have a chlorination pattern that is quite constant across various samples and conditions. This suggested that these patterns may be controlled by thermodynamic properties of the individual PCDD/F congeners, such as the free Gibbs energy of formation (Δg°(f,T)). This would make prediction of the isomer composition of a particular sample (and hence its TEQ value) possible, based on values of ΔG°(f,T). A laboratory scale study was carried out with activated carbon on fly ash as the source of PCDD/F formation. Although it was found that the isomer distributions within homologues were independent of the reaction time (proof of thermodynamic control), other observations (lack of equilibrium/isomerization between isomers and lack of similarity between isomer distributions measured and predicted by ΔG°(f,T)) contradicted the possibility of thermodynamic control. Hence, this study could not confirm that de novo formation of PCDD/F could explain thermodynamically controlled isomer distributions in incinerators. Some recommendations for further work- time-based studies with precursors, isomerization studies with single congeners, and more data on ΔG°(f,T) values of PCDD/F-were made. Polychlorinated dibenzo-p-dioxins (PCDD) and dibenzofurans (PCDF) emitted from municipal waste incinerators appear to have a chlorination pattern that is quite constant across various samples and conditions. This suggested that these patterns may be controlled by thermodynamic properties of the individual PCDD/F congeners, such as the free Gibbs energy of formation (ΔG°f,T). This would make prediction of the isomer composition of a particular sample (and hence its TEQ value) possible, based on values of ΔG°f,T. A laboratory scale study was carried out with activated carbon on fly ash as the source of PCDD/F formation. Although it was found that the isomer distributions within homologues were independent of the reaction time (proof of thermodynamic control), other observations (lack of equilibrium/isomerization between isomers and lack of similarity between isomer distributions measured and predicted by ΔG°f,T) contradicted the possibility of thermodynamic control. Hence, this study could not confirm that de novo formation of PCDD/F could explain thermodynamically controlled isomer distributions in incinerators. Some recommendations for further work - time-based studies with precursors, isomerization studies with single congeners, and more data on ΔG°f,T values of PCDD/F - were made.