The invention relates to a method and a device for producing diluted hydrofluoric acid using an electrode arrangement (1), which has an anode chamber (2) with an anode (4) and a cathode chamber (6) with a cathode (8), which are separated from one another by an anion exchange membrane (10), wherein in the method—pure water is guided through the anode chamber (2), —pure water, which includes at least one electrolyte which forms fluoride ions (F−), is guided through the cathode chamber (6), —and an electrical voltage is applied between the anode (4) and the cathode (8) such that the fluoride ions (F−) are moved through the anion exchange membrane (10) into the anode chamber (2), and an electrical current flows.

A method of preparing aqueous hydrogen fluoride is provided. The method includes providing a composition including a cross-linked polymer with absorbed hydrogen fluoride. The cross-linked copolymer includes acrylamide units and acrylic acid salt units. The method further includes contacting the composition with water to release at least a portion of the hydrogen fluoride from the composition to the water to form the aqueous hydrogen fluoride.

The invention relates to a method and a device for producing diluted hydrofluoric acid using an electrode arrangement (1), which has an anode chamber (2) with an anode (4) and a cathode chamber (6) with a cathode (8), which are separated from one another by an anion exchange membrane (10), wherein in the methodpure water is guided through the anode chamber (2), pure water, which includes at least one electrolyte which forms fluoride ions (F), is guided through the cathode chamber (6), and an electrical voltage is applied between the anode (4) and the cathode (8) such that the fluoride ions (F) are moved through the anion exchange membrane (10) into the anode chamber (2), and an electrical current flows.

A composition is provided including aqueous hydrogen fluoride; and a cross-linked copolymer comprising acrylamide units cross-linked with an acrylic acid salt. The cross-linked polymer has an average liquid aqueous hydrogen fluoride absorption capacity of less than 40 grams aqueous hydrogen fluoride per gram of cross-linked polymer.

A method of preparing aqueous hydrogen fluoride is provided. The method includes providing a composition including a cross-linked polymer with absorbed hydrogen fluoride. The cross-linked copolymer includes acrylamide units and acrylic acid salt units. The method further includes contacting the composition with water to release at least a portion of the hydrogen fluoride from the composition to the water to form the aqueous hydrogen fluoride.