Abstract
In this study, the solubility data of two-phase systems for tripotassium citrate and potassium sodium tartrate with PEG4000, 3000, 2000, 1000, and 400 g/mol were experimentally obtained. These data were fitted using empirical equations with MATLAB software. Also, the tie-lines were obtained and fitted by the Othmer–Tobias and Bancroft equations. The results were confirmed by UNIQUAC modeling. Tripotassium citrate resulted as the best salt according to the salting-out ability. The 16 experiments were done based on the Taguchi design of experiment (DOE) to extract the tetracycline from an aqueous solution; the results were analyzed with Minitab 18 software. Acetone was used as an adjuvant in this process. Polymer molecular weight and acetone concentration had the greatest effects on tetracycline extraction efficiency. The maximum extraction (99.78%) was obtained at the concentration of 5 ppm of tetracycline and 8 (% w/w) of acetone with PEG400.
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