Hydrogen fluoride recovery process
AssigneeIneca Fluor Holdings Limited
InventorsPaul Nicholas Ewing, Charles John Shields, Christopher Roberts
Life of this patent
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Abstract
A process for separating and recovering hydrogen fluoride from a mixture with an organic compound especially a fluorine-containing compound by extraction with a solution of an alkali metal fluoride in hydrogen fluoride, phase separation and recovery. A process for producing a fluorine-containing organic compound by fluorinating a starting material with hydrogen fluoride and similarly recovering hydrogen fluoride from the product stream. The solution may be anhydrous or aqueous.
Claims6
A process for the production of a fluorine-containing organic compound by reacting an organic starting material with hydrogen fluoride in the liquid phase or the gaseous phase in the presence of a fluorination catalyst to produce a product stream comprising an azeotropic or near azeotropic mixture of the fluorine-containing organic compound and unreacted hydrogen fluoride, contacting the product stream with a solution of alkali metal fluoride of from about 20% to about 80% by weight in hydrogen fluoride, effecting phase separation of an upper phase comprising the fluorine-containing organic compound and a lower hydrogen fluoride phase containing alkali metal fluoride and recovering hydrogen fluoride from the lower hydrogen fluoride phase.
Dependencies are inferred from the claim text.