Catalyst synthesis of halogenated compounds with catalyst regeneration with elemental halogen
AssigneeSolvay Fluor und Derivate GmbH
InventorsMax Braun, Carsten Brosch
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Abstract
Catalysts such as antimony halides, which are useful in fluorination reactions involving hydrogen fluoride, may be reduced during the reaction and require regeneration. Regenerative oxidation is usually carried out by introducing elemental halogen, preferably fluorine or chlorine, into the reaction mixture. In accordance with the invention elemental halogen is prevented from coming into contact with starting materials or intermediate products which are reactive therewith. This is preferably achieved by withdrawing part of the reaction mixture from the reactor, mixing the withdrawn part with chlorine or fluorine in order to regenerate the catalyst, and thereafter returning the withdrawn part to the reactor.
Claims16
A liquid-phase method for synthesizing partially halogenated, fluorine-containing organic compounds from saturated starting material or starting material having unsaturated bonds by halogen-fluorine exchange or addition of hydrogen fluoride using hydrogen fluoride in the presence of an Sb(V) catalyst, wherein used catalyst which is reduced to Sb(III) is regenerated by oxidation by reacting the catalyst with elemental halogen, comprising the step of providing a reaction mixture comprising used catalyst, partially halogenated, fluorine-containing organic compounds synthesized from the starting material and optionally starting material or unsaturated intermediates, wherein the regeneration is carried out such that elemental halogen does not come into contact with organic starting materials or intermediate products so that at most 10% by weight of the starting material is converted to undesired side products, and wherein the regeneration is carried out by introducing the elemental halogen into said reaction mixture after starting material or unsaturated intermediates are permitted to react.
Dependencies are inferred from the claim text.