Method for producing 4,4' dihalogendiphenylsulfone

C - Chemistry – Metallurgy – 07 – C

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C07C 317/14 (2006.01) B01J 21/16 (2006.01) B01J 23/28 (2006.01) B01J 23/30 (2006.01) B01J 23/888 (2006.01) B01J 23/889 (2006.01) C07C 315/00 (2006.01)

Patent

CA 2283894

The invention relates to a method for producing 4,4'-dihalogendiphenylsulfone by reacting halogenated benzene with 4-halogenphenylsulfonyl chloride in a liquid phase at high temperature, in the presence of a solid catalyst having acid centers. The method is characterized in that the reaction of 4- halogenphenylsulfonyl chloride with formula (I), in which X is chlorine, bromine or fluorine, with chlorobenzene, bromobenzene, or fluorobenzene, is carried out in the presence of a catalyst which is selected from one of the following groups: K1) catalysts consisting of essentially stratified silicates not having Lewis acids and having proton-saturated negative layer loads, or containing these as a basic component; K2) catalysts consisting of zeolites in the acid H form, or containing these as a basic component; and K3) catalysts consisting of mixed oxides having acidic centres, or containing these as basic components. The mixed oxides consist of a combination of (a) titanium, circonium, hafnium, tin, iron or Cr(III) oxides on the one hand, and (b) vanadium, chromium(VI), molybdenum, wolfram or scandium oxides on the other hand; or the mixed oxides are sulfatized or phosphatized oxides of the group (a), and said mixed oxides are calcined after combination, at temperatures of 450 to 800 ~C.

Procédé de fabrication de 4,4'-dihalogénodiphénylsulfone consistant à faire réagir un benzol halogéné avec un chlorure de 4-halogénophénylsulfonyle en phase liquide, en présence d'un catalyseur solide présentant des centres acides, à température élevée, caractérisé en ce qu'on fait réagir le chlorure de 4-halogénophénylsurlfonyle de formule (I), dans laquelle X désigne le chlore, le brome ou le fluor, avec un chlorobenzol, un bromobenzol ou un fluorobenzol, en présence d'un catalyseur choisi dans l'un des groupes ci-après: K¿1?) catalyseurs renfermant essentiellement des silicates stratifiés, non dotés d'acides de Lewis, présentant des charges en couche négatives saturées par des protons, ou renfermant ceux-ci comme constituants essentiels, K¿2?) catalyseurs renfermant des zéolites sous la forme H acide, ou renfermant ceux-ci comme constituants essentiels, ou K¿3?) catalyseurs renfermant des oxydes mixtes présentant des centres acides ou renfermant ceux-ci comme constituants essentiels, lesdits oxydes mixtes comprenant une combinaison (a) d'oxydes de titane, zirconium, hafnium, étain, fer ou Cr(III), d'une part, avec b) des oxydes de vanadium, chrome (VI), molybdène, tungstène ou scandium, d'autre part, ou bien les oxydes mixtes sont des oxydes sulfatés ou phosphatés du groupe (a), lesdits oxydes mixtes étant calcinés, selon leur teneur en impuretés, à des températures comprises entre 450 et 800 ·C.

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