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1. (WO2018104257) REMOVAL OF ARSENIC FROM FLUE-GAS
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Claims

1 . Process for the removal of AS2O3 and/or AS2O5 in process exhaust gases, comprising the step of passing the exhaust gases through a supported ionic liquid phase bed, characterized in that the ionic liquid comprises one or more cations from the list consisting of substituted phosphonium, ammonium, imidazolium, pyrrolidinium, and pyridinium, and one or more anions from the list consisting of chloride, bromide, and carboxylate.

2. Process according to claim 1 , wherein the substituted phosphonium cation is according to formula [Pm n o ]+, and the substituted ammonium cation is according to formula [Nm n o ]+, wherein the substituents are hydrocarbon chains containing m, n, o, and p carbon atoms each, with the proviso that m+n+o+p > 10 when the anion is a halide, and m+n+o+p < 30 when the anion is a carboxylate.

3. Process according to claims 1 or 2, characterized in that the carboxylate is an unbranched, unsaturated monocarboxylate, containing 1 to 8 carbon atoms.

4. Process according to any one of claims 1 to 3, wherein the supported ionic liquid phase comprises a support phase from the list consisting of alumina, silica, and activated carbon.

5. Process according to claim 4, whereby the support phase has a BET of more than 50 m2/g.

6. Process according to any one of claims 1 to 5, whereby the weight ratio of support phase to ionic liquid weight ratio is between 3 : 1 and 50 : 1 .

7. Process according to claim 6, wherein the process exhaust are off-gases from a metallurgical smelting process, characterized in that the supported ionic liquid phase is recycled to that process.