84852-53-9 Usage
Chemical Properties
Decabromodiphenyl ethane is a powder with a high molecular weight, very low water solubility, and low lipophilicity (as indicated by log Kow). The particles are <15 μm in diameter, and thus, this substance is expected to be respirable after inhalation exposure.
Physical properties
White or pale yellow powder. Slightly soluble in alcohol, ether, almost insoluble in water.
Uses
Decabromodiphenyl ethane (DBDPE) is a brominated flame retardant used as an additive in a variety of polymer and textile applications. In polymeric applications, such as high impact polystyrene,DBDPE is compounded or blended into the resin. The resulting DBDPE containing plastics are then converted to finished products by, for example, injection molding. For textile applications, DBDPE is blended with various latices and applied as a back coating to the textile.
Preparation
Diphenyl ethane (DPE) was synthesized by using benzene and dichloroethane as raw materials and AlC3 as catalyst, and then DPE was brominated and aged to obtain decabromodiphenyl ethane.
Application
Decabromodiphenyl ethane, a widely used new brominated flame retardant, is added into flammable materials to achieve fire retardation. It used in thermoplastics, thermosets, textiles and coatings that inhibit or resist the spread of fire.
Environmental Fate
Decabromodiphenyl ethane’s physicochemical properties suggest that it will partition predominantly in sediment and soil through binding to the organic fraction of particulate matter. In the EA environmental risk assessment, it concluded that DBDPEthane is unlikely to rapidly undergo photodegradation in the presence of hydroxyl radicals, it is not readily biodegradable in the aquatic environment under aerobic conditions, and it is not hydrolysable (no hydrolysable groups) (Dungey and Akintoye, 2007). No data were available to assess the biodegradation under anaerobic conditions [e.g., wastewater treatment plants (WWTPs) or in sediments]; the EA noted the possibility of reductive debromination under these conditions.
The potential for DBDPEthane to bioconcentrate was evaluated in an 8-week fish bioconcentration study (Dungey and Akintoye, 2007). When fish were exposed to DBDPEthane at concentrations of 0.5 and 0.05mg/l, the respective fish bioconcentration factors (BCFs) were <2.5 and <25 l/kg wet weight (ww), respectively. Since the water concentrations used exceeded DBDPEthane’s water solubility, the dissolved concentration was unknown. The EA appropriately considered this study invalid. No additional BCF studies are available; however, based on the physicochemical properties, lowtoxicity in acute and repeated dose mammalian, aquatic, and terrestrial studies, it is unlikely that DBDPEthane will bioaccumulate.
Check Digit Verification of cas no
The CAS Registry Mumber 84852-53-9 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 8,4,8,5 and 2 respectively; the second part has 2 digits, 5 and 3 respectively.
Calculate Digit Verification of CAS Registry Number 84852-53:
(7*8)+(6*4)+(5*8)+(4*5)+(3*2)+(2*5)+(1*3)=159
159 % 10 = 9
So 84852-53-9 is a valid CAS Registry Number.
InChI:InChI=1/C14H4Br10/c15-5-3(6(16)10(20)13(23)9(5)19)1-2-4-7(17)11(21)14(24)12(22)8(4)18/h1-2H2
84852-53-9Relevant articles and documents
PREPARATION OF HIGH ASSAY DECABROMODIPHENYLALKANE PRODUCT WITH LOW OCCLUDED FREE BROMINE CONTENT
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Page/Page column 7; 8, (2011/02/24)
A high assay decabromodiphenylalkane product in which the alkylene group contains in the range of about 1-10 carbon atoms and has an occluded free bromine content of a liquid phase reaction mixture, at least one α,ω-diphenylalkane having an alkylene group of 1-10 carbon atoms, with a limited excess of bromine, in the presence of an aluminum, aluminum halide or a ferric halide catalyst in which the original halogen atoms of such halides are chlorine atoms, bromine atoms, or both. The limited excess of bromine is such that the maximum excess amount of bromine used in conducting the reaction is about 20 mole % relative to the stoichiometric amount required to convert the amount of α,ω-diphenylalkane used to decabromodiphenylalkane. Crude high assay decabromodiphenylalkane product is prepared without use of heat treatment, oven ageing, or grinding or other forms of pulverization.
PREPARATION AND PROVISION OF HIGH ASSAY DECABROMODIPHENYLETHANE
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Page/Page column 6-7, (2008/12/07)
High assay, reaction-derived decabromodiphenylethane product is prepared by feeding (i) diphenylethane or (ii) partially brominated diphenylethane having an average bromine number less than about two, or (iii) both of (i) and (ii), into the liquid confines of a reaction mixture. Such reaction mixture is (a) formed from components comprised of excess liquid bromine and aluminum-based Lewis acid bromination catalyst, and (b) maintained at one or more elevated reaction temperatures of from about 45°-90° C., and at least when elevated pressure is needed to keep a liquid state in the reaction mixture at the temperature(s) used, the reaction mixture is at such an elevated pressure, whereby ar-bromination occurs. The feeding is conducted at a rate slow enough to form high assay reaction-derived decabromodiphenylethane product, which is an effective flame retardant.
PROCESSING OF SOLID BROMINATED AROMATIC ORGANIC COMPOUNDS CONTAINING OCCLUDED BROMINE
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Page/Page column 9, (2008/12/05)
Solid-state highly brominated compounds such as solid brominated flame retardants with bromine contents of at least about 60 wt % often contain occluded bromine. Because of their high bromine contents, such compounds have relatively low solubility in common organic solvents. Despite this low solubility, the content of occluded bromine in such solid brominated compounds is effectively reduced by agitating a concentrated agitated slurry of the compound in an inert solvent at a suitable temperature for at least about 1 hour. Thereafter, solids with reduced content of occluded bromine are isolated or recovered from the slurry. Novel products having substantially reduced or eliminated occluded bromine contents and other very desirable characteristics are also provided.