Hydrogen fluoride recovery process
AssigneeImperial Chemical Industries PLC
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.
Claims16
A process for separating and recovering hydrogen fluoride from an azeotropic or near azeotropic mixture of an organic compound and hydrogen fluoride which comprises contacting the azeotropic or near azeotropic mixture in the liquid phase with a solution of an alkali metal fluoride of from about 20% to about 80% by weight in hydrogen fluoride, effecting phase separation of an upper organic phase and a lower hydrogen fluoride phase containing alkali metal fluoride and recovering hydrogen fluoride from the lower hydrogen fluoride phase.
A process for separating and recovering hydrogen fluoride from an azeotropic or near azeotropic mixture of an organic compound and hydrogen fluoride which comprises contacting the azeotropic or near azeotropic mixture in the liquid phase with an essentially anhydrous solution of an alkali metal fluoride of from about 20% to about 80% by weight in hydrogen fluoride, effecting phase separation of an upper organic phase and a lower hydrogen fluoride phase containing alkali metal fluoride and recovering hydrogen fluoride from the lower hydrogen fluoride phase.
A process for separating and recovering hydrogen fluoride from an azeotropic or near azeotropic mixture of an organic compound and hydrogen fluoride which comprises contacting the azeotropic or near azeotropic mixture in the liquid phase with a solution of an alkali metal fluoride of from about 20% to about 80% by weight in aqueous hydrogen fluoride, effecting phase separation of an upper organic phase and a lower hydrogen fluoride phase containing alkali metal fluoride and recovering hydrogen fluoride from the lower hydrogen fluoride phase.
A process for separating and recovering hydrogen fluoride from a mixture of an organic compound and hydrogen fluoride comprising:
- a) providing a first liquid stream comprising an organic compound and hydrogen fluoride;
- b) combining said first liquid stream with a second liquid stream comprising a solution of an alkali metal fluoride of from about 20% to about 80% by weight in hydrogen fluoride;
- c) effecting phase separation of an upper organic phase and a lower hydrogen fluoride phase containing alkali metal fluoride;
- and
- d) recovering hydrogen fluoride from the lower hydrogen fluoride phase.
Dependencies are inferred from the claim text.