Parameters energy in the industrial production of tannins of Caesalpinia spinosa kuntze (Tara)

For the production of tannins from Caesalpinia spinosa, the optimal values were determined: Raw material / extractant ratio: 1: 3; extraction time of 45 min and a leaching temperature of 70oC; the tannin concentration being evaluated by the modified permanganate method. The optimization of the parameters was carried out using the Placket & Burman Design. The process consists of extraction, vacuum concentration, clarification for the mucilage precipitate using 95oGL ethanol; recovering the alcohol by distillation; Spray drying was carried out in batches at a temperature of 145oC, obtaining a tannin concentration of 0,840 mg / mL, with an average yield of dry product of 10,42% based on the raw material in the pod. The resulting biomass was dried, pelleted and densified to be used as fuel in a stationary grate boiler, determining a saturated steam generation index of 5,260 tonnes of steam ⁄ ton of dry biomass with 10% humidity