Patent Number: 
Section: claims

1. A process for recovering at least one platinoid element contained in an acidic aqueous solution comprising chemical elements other than said platinoid element, said process comprising the following steps:bringing said acidic aqueous solution into contact with a reducing amount of a reducing agent which is a non-sulphurous and non-glucidic alcoholic compound chosen from monocyclic aromatic compounds, the ring of which bears at least one, linear or branched, saturated or unsaturated hydrocarbon group, bearing at least one hydroxyl group and the ring of which also optionally bears one or more groups other than the hydrocarbon group, which reducing agent reduces said platinoid element to its 0 oxidation state; andseparating the reduced platinoid element from said acidic aqueous solution. 2. Process according to claim 1, wherein said compounds are phenylic compounds, the phenyl group of which bears at least one, linear or branched, saturated or unsaturated hydrocarbon group comprising from 1 to 4 carbon atoms, which hydrocarbon group bears at least one hydroxyl group, which phenyl group may also bear one or more groups other than the hydrocarbon group. 3. Process according to claim 2, wherein said compounds are phenylic compounds, the phenyl group of which bears a —CH2—OH group and optionally at least one group chosen from alkoxy or —OH groups. 4. Process according to claim 3, wherein such a compound corresponds to the benzylic alcohol of following formula: 5. Process according to claim 3, wherein such a compound corresponds to a benzylic alcohol derivative of following formula:in which R1 is an alkoxy group or a hydroxyl group. 6. Process according to claim 5, wherein R1 is situated in ortho, meta or para position with respect to the —CH2—OH group. 7. Process according to claim 5, wherein R1 is situated in para position with respect to the —CH2—OH group, in which case the compound meets the following formula:R1 being an alkoxy group or a hydroxyl group. 8. Process according to claim 7, wherein such a compound is chosen from 4-methoxybenzylic alcohol or 4-hydroxybenzylic alcohol, which correspond respectively to the following formulas: 9. Process according to claim 2, wherein said compounds are phenylic compounds, the phenyl group of which bears a —CH(OH)—CH3 group and optionally at least one group chosen from alkoxy or —OH groups. 10. Process according to claim 9, wherein such a compound corresponds to a compound of following formula: 11. Process according to claim 2, wherein such compounds are phenylic compounds, the phenyl group of which bears at least one, linear or branched, unsaturated hydrocarbon group comprising from 2 to 4 carbon atoms. 12. Process according to claim 11, wherein such compounds are phenylic compounds, the phenyl group of which bears a —CH═CH—CH2—OH group. 13. Process according to claim 12, wherein such a compound is the cinnamyl alcohol of following formula: 14. Process according to claim 1, wherein the platinoid element is palladium. 15. Process according to claim 1, wherein the acidic aqueous solution is a nitric solution. 16. Process according to claim 15, wherein the nitric solution is a raffinate from processes of treating irradiated nuclear fuels. 17. Process according to claim 1, wherein the group other than the hydrocarbon group is an alkoxy or —OH group. 18. A process for recovering at least one platinoid element contained in an acidic aqueous solution comprising chemical elements other than said platinoid element, said process comprising the following steps:bringing said acidic aqueous solution into contact with a reducing amount of a reducing agent which is cyclohexanol, reducing said platinoid element to its 0 oxidation state; andseparating the reduced platinoid element from said acidic aqueous solution. 19. Process according to claim 18, wherein the platinoid element is palladium. 20. Process according to claim 18, wherein the acidic aqueous solution is a nitric solution. 21. Process according to claim 20, wherein the nitric solution is a raffinate from processes of treating irradiated nuclear fuels.