Catalytic 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 This is preferably achieved by withdrawing part of the reaction mixture from the reactor, mixing the withdrawn part with chlorine or fluorine in order to regenerate the catalyst, and thereafter returning the withdrawn part to the reactor.
Claims19
A liquid-phase method for synthesizing partially halogenated, fluorine-containing organic compounds by halogen-fluorine exchange or addition of hydrogen fluoride using hydrogen fluoride in the presence of a catalyst, wherein used catalyst is regenerated by reacting the catalyst with elemental halogen, and wherein the regeneration is carried out such that elemental halogen does not come into contact with organic starting materials or intermediate products which react with elemental halogen to form undesired by-products by withdrawing a portion of the reaction mixture from the synthesis reactor, treating the withdrawn portion with elemental halogen to regenerate the catalyst therein, and thereafter returning the treated portion to the synthesis reactor.
Dependencies are inferred from the claim text.