Organic compounds -- part of the class 532-570 series – Organic compounds – Halogen containing
Reexamination Certificate
2007-08-17
2008-08-05
Puttlitz, Karl J (Department: 1621)
Organic compounds -- part of the class 532-570 series
Organic compounds
Halogen containing
C570S190000, C570S182000
Reexamination Certificate
active
07408088
ABSTRACT:
Bromine is scrubbed from a gaseous mixture of bromine and hydrogen bromide by passing the mixture into a mixture formed from (i) diphenylethane and/or partially brominated diphenylethane with average bromine number less than about 2 and (ii) a catalytic quantity of iron and/or iron halide in which the halogen atoms are bromine atoms and/or chlorine atoms. Component (i) is brominated, and during such bromination, the mixture is kept hot enough to melt the organics to provide a liquid phase in the scrubber. Gaseous mixtures of bromine and hydrogen bromide are formed in processes of the invention in which decabromodiphenylethane products are produced using the partially brominated diphenylethane as feed to the bromination, which is conducted using an aluminum-based catalyst. Effective ways of removing iron catalyst residues from partially brominated diphenylethane or from decabromodiphenylethane product are also described.
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Yang, Ze-hui, et al., “Technological Progress in Catalytic Synthesis of Decabromodiphenyl Ether by Brominating Diphenyl Oxide with Bromine Chloride”, Fine Chemicals, vol. 19, Jan. 2002, pp. 42-44, abstract only translated.
Albemarle Corporation, XP002458574, Saytex 8010 Flame Retardant, Brochure, 2001, 2 pages.
Albemarle Corporation
Puttlitz Karl J
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