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Selective pertraction of carboxylic acids obtained by citric fermentation

Domenii publicaţii > Stiinte ingineresti + Tipuri publicaţii > Articol în revistã ştiinţificã

Autori: Dan Cascaval, Anca-Irina Galaction, Corneliu Oniscu

Editorial: Separation Science and Technology, 39, p.1907-1925, 2004.

Rezumat:

Pertraction through liquid membranes is one of the most recent liquid-liquid extraction techniques that could be applied for separation of biosynthetic products. In this paper, the facilitated pertraction has been used for selective separation of citric, malic and succinic acids from a mixture. The separation equipment includes a U-shaped cell containing 1,2-dichloroethane as liquid membrane and Amberlite LA-2 as carrier. The experimental data indicated that malic and succinic acids can be initially selective separated from citric acid at an equimolecular ratio between the carrier and these acids. Then, for a selective separation of malic acid from succinic acid a carrier molar concentration inside the liquid membrane equal to that of malic acid in the feed phase is required. The favorable effect of carrier concentration on separation selectivity is enhanced by the modification of aqueous phases pH and mixing intensification.

Cuvinte cheie: Pertraction, Liquid membranes, Reactive extraction, Bioseparation