Process for the recovery of iodine from aqueous solutions
AssigneeBracco Imaging S.P.A.
InventorsLaura Galimberti, Andrea Banin, Sonia Gazzetto, Fernanda Di Giorgio, Roberta Fretta
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Abstract
The invention relates to a process for the recovery and recycling of the iodine from aqueous solutions comprising iodine-comprising aromatic compounds in which the iodine contained in said aromatic compounds is directly converted into molecular iodine at a pH lower than 1, in the absence of a catalyst.
Claims21
A process for recovering molecular iodine from an aqueous solution comprising a iodine-containing aromatic compound and a iodine-containing inorganic compound comprising an iodide ion, said process comprising the steps of:
- A) converting the iodine of said iodine-containing aromatic compound into molecular iodine by contacting the iodine of said iodine-containing aromatic compound with the iodide ion without an additional reactant and heating the aqueous solution at a temperature of from 80° C. to 300° C.;
- and
- B) collecting said molecular iodine
- wherein the pH of the aqueous solution comprising the iodine-containing aromatic compound undergoing the conversion of step A is 1 or lower and wherein the weight ratio between the iodide ion and the iodine contained in the aromatic compound in the aqueous solution is at least 0.5 or higher.
A process for recovering molecular iodine from an aqueous solution comprising a iodine-containing aromatic compound and a iodine-containing inorganic compound comprising an iodide ion, said process comprising:
- A) converting the iodine of said iodine-containing aromatic compound into molecular iodine by contacting the iodine of said iodine-containing aromatic compound with the iodide ion without an additional reactant at a pH lower than 1 and heating the aqueous solution at a temperature of from 80° C. to 300° C.;
- A′) oxidizing a possible residual iodide ion into molecular iodine by adding an oxidizing agent to the solution of step A;
- B) collecting the molecular iodine formed in steps A and/or A′;
- and
- C) recovering the possible residual iodine-containing aromatic compound and/or molecular iodine.
Dependencies are inferred from the claim text.