| 摘要 |
1331648 Tri-iodides of anion-exchange resins KANSAS STATE UNIVERSITY RESEARCH FOUNDATION 23 Nov 1970 [3 Dec 1969 2 Nov 1970] 55644/70 Heading C3P [Also in Division C1] Strongly basic anion exchange resins such as those based on polystyrene and containing, for example, quaternary ammonium, alkyl pyridinium, tertiary sulphonium, quaternary phosphonium and quaternary alkyl groups, are treated with an aqueous solution containing triiodide ions I 3 <SP>-</SP>, and thus converted into a triiodide " salt " form which is hardly ionized in water. Alternatively the resin may be reacted with an iodide and then with elemental iodine by forming a slurry in water. The thus treated resins are characterized in that on passing distilled water through them, they liberate less iodine (in any of its oxidizing forms, such as I 2 , I 3 -, IO 3 - &c.), than will give a positive result on testing the passed water with a cadmium iodidelinear starch test reagent. In the examples the tri-iodide is produced by dissolving elemental iodine in KI solution, and passing the resulting solution through the various resins specified above, commercially available as Ionac (quart alkyl type), Stamex (tert. sulphonium type). Rexyn, "Amberlite"-Trade Mark (both quart ammonium types) and " Dowex " (Trade Mark). The resins are used for removing bacteria from water (see Division C1), the bacteria being destroyed by the tri-iodide ions. |
