Citric acid is one of the organic acids of which world market is growing every year. This paper proposes reactive extraction of citric acid with trioctylamine as an alternative to the classical method [1]. An experimental setup with solvent recycling is presented. As organic solvents were used: octanol, cyclohexanol, iso-butyl alcohol and paraf®n oil. The removal ef®ciency is enhanced when the reactive extraction is accompanied by back-extraction using sodium carbonate as stripping agent.

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The research by modelling has been particularized at the case of removal of carbon dioxide from hot burning gases. The gases washing with specific solution in mobile packed bed expresses the basic of proposed removal procedure of carbon dioxide. A large assembly of differential equations give the mathematical model of the considered procedure. The given simulations show that the carbon dioxide and sulphur dioxide removal occurs with high intensities depending of the concentration level of the liquid active species.

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