Hydrogen fluoride recovery process
AssigneeIneos Fluor Holdings Limited
InventorsPaul Nicholas Ewing, Charles John Shields, Robert Elliott Low
Life of this patent
Estimating the term…
Abstract
Processes for separating and recovering hydrogen fluoride from a gaseous mixture of an organic compound and hydrogen fluoride are disclosed. The processes include contacting the gaseous mixture with a solution of an alkali metal fluoride in hydrogen fluoride, separating a gas phase depleted in hydrogen fluoride and containing the organic compound from a liquid phase, and recovering hydrogen fluoride from the liquid phase.
Claims17
A process for separating and recovering hydrogen fluoride from a gaseous mixture of an organic compound and hydrogen fluoride which comprises contacting the gaseous mixture with a solution of an alkali metal fluoride in hydrogen fluoride, separating a gas phase depleted in hydrogen fluoride and containing the organic compound from a liquid phase enriched in hydrogen fluoride and recovering hydrogen fluoride from the liquid phase enriched in hydrogen fluoride.
A process for separating and recovering hydrogen fluoride from a gaseous mixture of an organic compound and hydrogen fluoride which comprises contacting the gaseous mixture with an essentially anhydrous solution of an alkali metal fluoride in hydrogen fluoride, separating a gas phase depleted in hydrogen fluoride and containing the organic compound from a liquid phase enriched in hydrogen fluoride and recovering hydrogen fluoride from the liquid phase enriched in hydrogen fluoride.
A process for separating and recovering hydrogen fluoride from a gaseous mixture of an organic compound and hydrogen fluoride which comprises contacting the gaseous mixture with a solution of an alkali metal fluoride in aqueous hydrogen fluoride, separating a gas phase depleted in hydrogen fluoride and containing the organic compound from a liquid phase enriched in hydrogen fluoride and recovering hydrogen fluoride from the liquid phase enriched in hydrogen fluoride.
A process as claimed in any preceding claim wherein the alkali metal fluoride comprises potassium fluoride and/or caesium fluoride.
A process for the production of a fluorine-containing organic compound by reacting an organic starting material with hydrogen fluoride in the gaseous phase or in the liquid phase optionally in the presence of a fluorination catalyst to produce a gaseous product stream comprising the fluorine-containing organic compound and unreacted hydrogen fluoride, contacting the product stream with a solution of an alkali metal fluoride in hydrogen fluoride, separating a gas phase depleted in hydrogen fluoride and containing the organic compound from a liquid phase enriched in hydrogen fluoride and recovering hydrogen fluoride from the liquid phase enriched in hydrogen fluoride.
Dependencies are inferred from the claim text.