Method of recovering HF from mixtures containing C.sub.1 -C.sub.3 halocarbon compounds
AssigneeDow Chemical (Nederland) B.V.
InventorA. Theodorus van Eijl
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Abstract
Hydrogen fluoride can be separated from an organic mixture of fluorinated C.sub.1 -C.sub.3 compounds and recovered for reuse by selectively absorbing the HF in a glycol in which the HF is soluble, but the fluorinated organic compound is substantially insoluble. If desired, HF can be obtained in anhydrous form.
Claims9
A method of recovering the HF which is dissolved in the organic layer obtained after fluorinating a C.sub.1 -C.sub.3 chlorinated hydrocarbon and after separating HCl and cooling to form an HF rich layer and said organic layer, comprising commingling (a) the substantially HCl free organic C.sub.1 -C.sub.3 halocarbon layer containing chloro-, chlorofluoro-, and fluorocarbons with (b) a glycol lean in HF and which is liquid at the temperature employed and which has from 2 to 8 C atoms, forming a glycol layer having hydrogen fluoride selectively dissolved therein and a C.sub.1 -C.sub.3 halocarbon layer containing chloro-, chlorofluoro- and fluorocarbons, separating the C.sub.1 -C.sub.3 halocarbon layer from the glycol layer and recovering hydrogen fluoride from the glycol layer.
Dependencies are inferred from the claim text.