Extraction of anions from pyrolytic bio-oil by Liquid-Phase Polymer-Based Retention

The development of techniques that allow the separation of organic compounds present in the bio-oil of the pyrolysis of biomass is of great interest for using this technology to generate chemical products with added value.Thus, this work aimed to evaluate the extraction of the organic anions acetate and sulfonate from pyrolytic bio-oil of sugarcane bagasse (SCB) by means of Liquid-phase Polymer-based Retention (LPR).For this, the SCB was characterized using elementary analysis, thermogravimetric analysis, and differential thermal analysis.Subsequently, the pyrolysis of the SCB was performed, and the liquid fraction was analyzed by GC/MS.Finally, the synthesis and characterization of sodium p-toluenesulfonate (p-TsNa) was carried out, and retention and release tests of the acetate and sulfonate anions were carried out with the poly (diallyldimethylammonium chloride) (pDADMAC).The model solutions show the highest retention is obtained at pH 9.0 and the ionic strength of 0.01 molal of NaCl for the acetate anion.In contrast, for the sulfonate anion, the best retention was obtained at low ionic strength (without adding NaCl).In contrast, the lowest retentions were obtained at pH 4.0 with an ionic strength of 0.01 molal of NaCl for both cases.On the other hand, removing the p-TsNa anion in the bio-oil showed that it is possible to recover 237.3 mg of p-TsNa per gram of pDADMAC.It was concluded that the LPR technique using pDADMAC can be used to separate anions, acetate, and sulfonate in the pyrolytic bio-oil of SCB.