Anion exchangers Amberlites

Eig. 5. Pressure drop as affected by resin type, flow rate, and temperature, where A, B, and C, correspond respectively to acryUc strong base anion exchanger (Amberlite IRA-458), styrenic strong base anion exchanger (Amberlite IRA-402), and styrenic strong acid cation exchanger (Amberlite IR-120), all at 4°C. D represents styrenic strong acid cation resin (Amberlite IR-120) at 50°C (14). To convert kg/(cm -m) to lb/(in. -ft), multiply by 4.33 to convert... 

Aliphatic amine-type weak base anion exchangers Amberlites IR-45 and IRA-67 Dowex 3-x4A Permutit E Permutit A 240A (Rohm and Haas, USA) (Dow Chemical Co, USA) (Permutit AG, Germany) (Phillips and Pain-Vermorel, France)... 

Polymers heparinized via the procedures involving anion-exchange Amberlite XE-255 resin > 480... 

Anion exchange Amberlite IRA 900 Polyvinylpyridinium polymer Layered double hydroxides Sulfonated porphyrins, phthalocyanines Sorokin and Meunier (112), Mirkhani et al. (113) Labat and Meunier (114) Chibwe and Pinnavaia (115)... 

Displacements. For the displacement ArCH2X ArCHjCN, a strongly basic anion exchanger (Amberlite IRA-400 or Dowex 21 K) was first converted into... 

Antimony was separated from Bi on a cation exchanger in a tartrate medium [31]. Mixtures of antimony and tin were separated as malonates on the anion exchanger, Amberlite IRA-400. The chloride complex of Sb(V) is retained on the strongly basic anion-exchanger. 

Traces of iodide can be separated as Agl by co-precipitation with silver chloride [3-5]. Trace amounts of iodide present in brines were retained on the anion-exchangers Amberlite IRA 458 [6] or Shodex 1-524 A [7]. 

Trace amounts of molybdenum have been separated from natural waters by retention of the anionic Mo-thiocyanate complex on the anion-exchanger Dowex 1. Mixtures of 2 A/ HCIO4 and 1 M HCl are used for the elution [24]. The Mo-thiocyanate complex has also been concentrated on the anion exchanger Amberlite XAD [25,26], with the use of acetone as the eluent [25]. Molybdenum has been retained on anion-exchange columns from an HCl medium prior to being determined by the thiocyanate method [27-30]. Mo has been sorbed selectively (pH 3.5) on the anion exchanger Sephadex G-25, from which it can be eluted withEDTA [31]. 

Minoia et al. (1983) used a liquid anion exchanger Amberlite LA 1 or LA 2 in isobutyl methyl ketone and 6 mol/L HCI mixture, which was added to the aqueous biological specimen (in casu urine). After extraction of the anions, centrifugation and separation of both phases, all Cr(VI) was bound to the organic phase, whereas Cr(lll) was present in the aqueous phase. 

Similar studies of application of anion exchangers Amberlite IRA-900 (macroporous, polystyrene, strongly basic anion exchanger of type 1, 16-50 mesh) [133-135] and Amberlite IRA-410 (gel, polystyrene, strongly basic of type 2,16-50 mesh) [135] for recovery and removal of trace amounts of Pd(II), Pt(II), Ru(III), Rh(III), Au(III) and Ir(IV) ions from chloride and radioactive nitrate waste waters were carried out by the Els et al. [133, 134] and El-Said et al. 

Selectivity of the anion exchanger TVmberlite IRA-900 for Pd(II) ions depends on the concentration of Cl ions in the solution. Quantitative sorption of palladium(II) ions from the chloride solutions is obtained at [Cl < 0.25 M. Sorption capacity of the anion exchanger Amberlite IRA-900 for Pd(II) ions in 0.2 M HCl solution was 0.0017 mmol/dm ([Pd ] 350 ppm)... 

The physical adsorption and tl-tl dispersion forces can arise horn the aromahc nature of the resins and the dyes. A similar phenomenon was observed for the sorphon of Acid Green 9 on the weak and strong base anion exchange resins [42], for the sorphon of Simset Yellow on the weakly basic anion exchanger Amberlite FPA 51 [43] and shongly basic /Vmberlite IRA 900 and IRA 910 [44] as well as for the sorption of Brilliant Yellow on Tkmberlite IRA 67, Amberlite IRA 458 and Amberlite IRA 958 [45]. 

Based on the values of the monolayer sorption capadties towards C.I. Acid Orange 7 (1370.4 mg/g), C.I. Reactive Black 5 (1655.2 mg/g) and C.I. Direct Blue 71 (1630.6 mg/g), it seems that the macroporous anion exchanger Amberlite IRA 958 can be a promising adsorbent for the textile wastewater treatment. 

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