| abstract |
A method for extraction of a polyester polymer composed of a complex mixture of interesterified, long-chain ω-hydroxy acid with typically a 16- or 18-carbon skeleton from the waste of tomato peels. The method provides a thermal treatment of the tomatoes peels, in which tomato peels are immerged in an alkaline solution; a filtration phase, for separating solid residue by liquid; then the liquid is kept for a step of acidification adding an inorganic acid until the solution changes its color so that the pH of the solution after the color changing is comprises in the interval 5-6. Follow a centrifugation phase, in which the solution is centrifuged at a range of 10000-14000 rpm for 15-20 minutes; after the centrifugation the supernatant is discarded or reintroduced in the process for another extraction, while the solid residue is kept and centrifuged with water DDW from 1 to 3 times in the same conditions; these further steps having the scope of washed/cleaned the solid residue. |