- COMPOSITION CONTAINING C8F17Br AND METHOD FOR PRODUCING C8F17Br
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This invention provides a composition that contains PFOB with a PFOA content lower than that of known PFOB, and that is less likely to have an adverse effect on the environment; and provides a method for producing PFOB. The composition contains C8F17Brand further contains C7F15COOH, wherein C7F15COOH is present in a concentration of 25 ppb or less based on the total weight of C8F17Br. The method for producing C8F17Br comprises reacting C8F17I and a brominating agent to obtain C8F17Br, and alkali-washing the obtained C8F17Br to reduce the C7F15COOH content to 25 ppb or less based on the total weight of C8F17Br.
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Paragraph 0054-0057
(2020/06/08)
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- Process for preparing perfluoroalkyl bromides
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The present invention provides a process for preparing a perfluoroalkyl bromide characterized by reacting a perfluoroalkyl iodide represented by the formula Cn F2n+1 I wherein n is an integer of 6 to 10 with bromine in a light-transmitting reactor with exposure to light and heating at 120° to 180° C. while simultaneously removing IBr resulting as a by-product by separation of a layer.
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- Viscoelastic compositions containing concentrated fluorinated compounds their method of preparation and their uses
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Compositions for topical application in gel form comprising a fluorocarbon or perfluorocarbon compound or mixtures thereof at a concentration of at least about 75% v/v, a minor quantity of a surface active agent and an aqueous phase. The compositions provide a storage-stable high concentration fluorocarbon gel that is prepared without the use of thickeners or additional stabilizing agents. The gels are useful in formulations for pharmaceutical, cosmetic purposes and for other products as well.
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- Reactivite par voie thermique de RFH
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Hydroperfluoroalkanes are well known as being rather inert chemically.Hydroperfluoroalkanes react at high temperature with carbon tetrabromide and carbon tetrachloride to yield bromoperfluoroalkanes and chloroperfluoroalkanes. - Keywords: Hydroperfluoroalkanes; High-temperature reaction; Carbon tetrabromide; Carbon tetrachloride; Bromoperfluoroalkanes; Chloroperfluoroalkanes
- Signe, E.,Blancou, H.,Commeyras, A.
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p. 197 - 200
(2007/10/02)
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- Process for the preparation of substantially fluorinated alkyl bromides
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According to the process according to the invention, substantially fluorinated alkyl bromides, preferably perfluoroalkyl bromides, are prepared by reaction of substantially fluorinated alkyl iodides, with phase transfer catalysts in the bromide form.
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- Process for the preparation of substantially fluorinated alkyl bromides
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According to the process according to the invention, substantially fluorinated alkyl bromides, preferably perfluoroalkyl bromides, are prepared by reaction of substantially fluorinated alkyl iodides with organic bromine compounds in which the bromine atom is bound covalently to a carbon atom or a nitrogen atom.
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- Process for removing impurities from perfluorinated alkyl bromides or alkylene dibromides
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Mixtures of perfluorinated alkyl bromides or alkylene dibromides containing perfluorinated iodine compounds are irradiated with electromagnetic radiation in the wavelength range from 230 to 500 nm and brought into contact, either during the irradiation or directly thereafter, with at least one of the following agents: active charcoal, certain finely divided metals, lower aliphatic alcohols, chlorine, bromine, oxygen, hydrogen peroxide, aqueous or alcoholic solutions of alkali metal compounds with certain inorganic anions or lower aliphatic alcohols. After removal of the agent and if appropriate distillation, products which contain less than 0.0005% by weight of iodine compounds and can be employed, for example, in the medical sector can be obtained.
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- Process for the preparation of extensively fluorinated alkyl bromides
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A process for the preparation of extensively fluorinated alkyl bromides from the corresponding iodides is described in which, in a dipolar aprotic solvent, a bromide which is present as a salt of an alkali metal, alkaline earth metal, copper or substituted or unsubstituted amonium is reacted with an extensively fluorinated alkyl iodide at 120° to 200° C. The reaction can be carried out at -10° to +120° C., in some cases with improved yields if it is carried out in the presence of an alkali metal salt of at least one hydroxyalkanesulfinic acid having 1 to 5 carbon atoms. The novel process enables uncomplicated apparatuses to be used without particular safety measures and presents no corrosion problems.
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