Methods for storing chelating resins

Store at 5 - 40 degrees. This post was last edited by limingshuguang on 2007-12-11 15:52.]

Do not let the temperature drop below 5 degrees, nor exceed 50 degrees

Is the temperature of 5-40 an empirical temperature? I just checked the technical specifications, and it says -20 to 40. Although that’s what the instructions state, I don’t really believe those temperatures, because -20 seems too low.

Product information on resin TP 208 for brine purification in the ion-exchange membrane caustic soda industry: Lewatit TP 208 is a weak-acid-type macroporous cation exchange resin with iminodiacetic acid groups chelated therein, used for the selective removal of alkaline earth metal and heavy metal cations. Its standard particle size distribution and excellent mechanical stability make it particularly suitable for the following applications: ●1) Final purification of brine feed in the ion-exchange membrane caustic soda industry ； Further removal of trace alkaline earth metal ions after precipitation with carbonates in a pH range of 7–11 ●2) Removal of heavy metal ions from the neutralized wastewater at a flow rate of 40 m/h or less and an operating temperature of 80°C or less, without the involvement of calcium. The operating capability of Lewatit TP 208 depends on the pH value of the saline solution. The capacity at PH 11 is approximately three times that at PH 7. When PH is 9 and the calcium content is 2–20 ppm, the operating capacity is 0.6 Lewatit TP 208 equivalents (in terms of volume as hydrogen). At a flow rate of 20 BV/h, the calcium residue in the treated electrolytic brine is less than 0.02 ppm. Better results can be achieved by using 2 sets of resin devices of the same size in sequence (see our technical information OC/I 20802). The order in which heavy metal ions are removed from neutralized wastewater using Lewatit TP 208 is as follows: copper > vanadium > (VO) > tungsten (UO2) > lead > nickel > zinc > cadmium > iron(II) > beryllium > manganese > calcium > magnesium > strontium > barium > sodium. This selective extraction can also be achieved in the presence of the following chelating agents: ● nitrogen-containing compounds, such as ammonia, aliphatic and aromatic amines. ●Polyvalent carboxylic acids, such as citric acid, gluconic acid, glucuronic acid, oxalic acid, tartaric acid. ●Phosphates, such as tetrasodium diphosphate, sodium polyphosphate. Lewatit TP 208 cannot remove heavy metal ions from solutions containing EDTA or NTA respectively. Only calcium can be removed from solutions containing cyanide. To remove the heavy metal ions that come after the tungsten dioxide ions in the sequence list above, Lewatit TP 208 must be treated with a caustic soda solution after each regeneration cycle or before each consumption cycle. After treatment, it will be in partial salt form, such as the monosodium form. However, for the ultimate purification of the chlor-alkali brine feed, the disodium form of Lewatit TP 208 must be used. Before using the Lewatit TP 208 unit on our behalf, please refer to our technical data sheet OC/I 20343e for laboratory testing. The full capabilities of this product can only be realized when it is used in accordance with the technologies and procedures corresponding to the current level of technology. More suggestions related to this can be obtained from Bayer AG, Professional Products Group, Ion Exchange Resins Division. General description: Ionic form (shipping): Na+. Functional group: Iminodiacetic acid. Matrix: Cross-linked polystyrene. Structure: Macroporous. Apparent color: Light brown, opaque. Physical and chemical properties: Particle size* – >90% at 0.4–1.25 mm. Effective size*: 0.55 (+/-0.05) mm. Uniformity coefficient* – maximum value of 1.8. Volume density (+/-5%): 790 g/l. Density: approximately 1.17 g/ml. Water content: 55–60%. Total capacity in H-form: minimum value of 2.9 eq/l. Volume change upon Na+ → H+: approximately -40%. Stability: within a pH range of 0–14. Storage properties: Minimum storage period for the product: 2 years. Storage temperature: °C –20 to +40. *These values are standard values; further measurements are ongoing. Recommended operating conditions* Operating temperature: Maximum °C – 80. Operating pH range: 2–12. Bed thickness: Minimum value in mm – 1000. Specific pressure drop (at 15°C): Approximately kPa·h/m² – 1.1. Maximum pressure drop: kPa – 250. Linear flow rate for consumption: Maximum value in m/h – 40. Linear flow rate for backflow (at 20°C): Approximately m/h – 10. Regenerant: HCl. Level during parallel flow regeneration: Approximately g/l – 140. Concentration during parallel flow regeneration: % – 4–10. Linear flow rate during regeneration: Approximately m/h – 5. Linear flow rate during washing: Approximately m/h – 5. Requirements for wash water: Approximately BV – 5. Bed expansion (at 20°C, per m/h): Approximately % – 5. Empty space: Equivalent to % of resin volume; Approximately % – 80. *The recommended operating conditions refer to the use of the product under normal operating conditions. It is based on the results of experiments conducted in experimental workshops, with data coming from factory applications. However, other data are still needed to calculate the volume of resin required for the ion exchange system. These can be found in our technical information sheet. **Strong regeneration *** Purification at 100 m/h. Safety precautions: Strong oxidizers such as nitric acid can cause violent reactions when in contact with ion exchange resins. Toxicity: Be sure to follow the safety data sheet. The table contains additional data on product description, transportation, storage, handling, safety, and ecology. Processing: We do not yet have specialized technology for the recycling of resin that has been used. In the European Community, the following possible treatment methods can be used: Resins used in water treatment and the sugar industry can be treated in accordance with Rule 190 905. We tend to recommend burning it in an industrial incinerator. The above information may be helpful to you