Abstract
The reactive extraction of salicylic acid from xylene, in which it exists as a free monomer and a dimer, was carried out with aqueous extract phases. Depending on the pH value of the aqueous phase, pure physical extraction (pH ≤ 1) or reactive extraction (pH ⪢ 1) takes place. The selected reaction was neutralization of salicylic acid by sodium hydroxide. Under pH 12 conditions the mass-transfer resistance of the aqueous phase was completely eliminated. Furthermore, the mass transfer with LA-2 loaded xylene phases was investigated. In this case, the salicylic acid exists as a free monomer, as a dimer and is also arranged as amine complexes. These measurements with and without the secondary amine allowed the determination of the fractional mass-transfer coefficients of the free monomer, dimer and complex formation in the organic phase, as well as those of the acid and acid anion in the aqueous phase and their dependence on the most important process variables.
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