Acetilação de compostos lignocelulósicos oriundos do reaproveitamento de resíduo da olivicultura

Abstract

The present work aimed to obtain and characterize a new acetylated material, which was developed from the reuse of lignocellulosic compounds from the olive stone from olive pomace. The experimental methodology was based on the separation of the olive stones (OS) contained in the olive pomace, followed by the obtaining of the purified stone (PS) through delignification, and subsequent acetylation reaction of the acetylated material (ACM). Characterization analyzes of the materials were carried out through tests of lignin content, ash, granulometric analysis, thermogravimetric analysis and solubility test. It was observed that about 80% of the OS particles had a diameter of fewer than 50 μm, with a lignin content corresponding to 46.92% and 0.48% ash. The delignification reaction, carried out using the organosolve methodology, promoted a reduction in the lignin content, present in the OS, by about 76%. The TGA analysis indicated an increase in the degradation temperature of the OS after its delignification, this result can be associated with an increase in the thermal stability of the cellulose, due to the increase in its purity. The thermal analysis of the ACM indicated that the synthesized material has a high degradation temperature. ACM solubility testes were performed using different organic solvents and the results indicated that the acetylation reaction did not result in the formation of soluble compounds in organochlorine solvents, as expected for cellulose di and triacetate. Therefore, the results suggested the need for a deeper study regarding the purification processes of the precursor material, as well as regarding the ideal conditions for the acetylation reaction of the PS.