Separation of carboxylic acids on partially sulphonated cation-exchangers by ion-exclusion chromatography

✍ Scribed by E. Papp; K. Stitz; P. Hajós

• Publisher: Elsevier Science
• Year: 1992
• Weight: 78 KB
• Volume: 17
• Category: Article
• ISSN: 0923-1137
• DOI: 10.1016/0923-1137(92)90621-8

✦ Synopsis

70x 1200 cm) columns. A solution, obtained from the process rinsewater, containing silver as the anionic cyanide complex was passed through the resin column where silver adsorbed as [Ag(CN)2]-. The elution was made with 2 M KSCN solution. From the first 2.5 BV of eluate the silver was recovered electrically. The second 2.5 BV eluate and the electrically cleaned first part was used for a new elution. Using Varion ADPM (C1) ion-exchange resin makes it possible to concentrate dilute solutions economically so that eluate can be subjected to common refining procedures to recover the silver. The capacity depends on the concentration of silver in the rinsewater and flow rate. If the initial concentration of silver was 500 mg/dm 3, flow rate 3 BV/h, breakthrough occurred after 70 BV. Leakage from resin was less than 1 mg/dm 3. Over 9 cycles the capacity averaged 48.7 g Ag/dm 3 of resin.