Experimental studies on the enrichment of carboxylic acids with tri-n-octylphosphine oxide as extractant in a supported liquid membrane

✍ Scribed by Yin Shen; Lena Grönberg; Jan Åke Jönsson

• Publisher: Elsevier Science
• Year: 1994
• Tongue: English
• Weight: 737 KB
• Volume: 292
• Category: Article
• ISSN: 0003-2670
• DOI: 10.1016/0003-2670(94)00041-7

✦ Synopsis

The enrichment of carboxylic acids using a supported liquid membrane was experimentally studied. A supported PTFE membrane was impregnated with a solution of tri-n-octylphosphine oxide (TOP01 dissolved in di-n-hexyl ether (DHE). TOP0 was found to he an effective extractant, especially for highly polar acids. The extraction efficiency and the memory effects of the acids were investigated under various conditions of TOP0 content and pH of the acceptor phase. It was observed that the pH of the acceptor phase had a great influence on the memory effect and extraction efficiency when using the TOPO-containing membrane; these effects were more pronounced for highly polar acids. The mechanisms of the extraction and the memory effects of carboxylic acids and also the influence of the co-diffusion of carbonic acid on the extraction are discussed.