Santos, Luciene da SilvaSilva, Brendo Revoredo da2023-03-112023-03-112022-12-22SILVA, Brendo Revoredo da. Otimização da derivatização de celuloses advindas de biomassas residuais da agroindústria via design experimental e metodologia de superfície de resposta. 2022. 69f. Trabalho de Conclusão de Curso (Graduação em Química do Petróleo), Instituto de Química, Centro de Ciências Exatas e da Terra, Universidade Federal do Rio Grande do Norte, Natal, 2022.https://repositorio.ufrn.br/handle/123456789/51870Carboxymethylcellulose (CMC) is a polymer obtained from the cellulose derivatization process. This work aims to produce CMCs from pulps of residual origin, derived from sugarcane bagasse (SCB) and corn cob (IM). This process was based on a series of treatments of in natura biomasses, with the objective of extracting high quality celluloses (BCel and MCel) for the synthesis of CMC. The combined chemical treatment (BHL), followed by bleaching with sodium chlorite, was efficient for the extraction of high purity pulps. The pulps obtained were converted into CMC with variation of reaction conditions, determined by an experimental design of the D-Optimal type with twenty-eight experiments, where the factors Activation Time (TA), Reaction Time (RT), NaOH concentration (NaOH%) and Cellulose (BCel or MCel). The spectra obtained through spectroscopy analyzes in the infrared region with Fourier transform (FTIR) indicated the reduction of characteristic bands of the hemicellulose and lignin fractions and the increase of intensity of the bands related to cellulose in the bleached pulps, proving that the process of cellulose extraction occurred satisfactorily. Likewise, the characteristic bands of the carboxymethyl group are observed in the FTIR spectra of the carboxymethylation products, indicating the successful synthesis of the product of interest from sustainable celluloses. With the objective of optimizing the conditions of the synthesis process, the effect of the factors studied on the Mass Yield and Water Solubility responses was studied using analysis of variance (ANOVA) and response surface methodology (RSM). Through statistical analysis, it was possible to determine that the increase of NaOH% is the most relevant factor to generate CMCs with high yield and high solubility in water, and that shorter TA and TR times are necessary to produce high quality CMCs from biomass. waste, saving time and energy.Attribution-NonCommercial-NoDerivs 3.0 Brazilhttp://creativecommons.org/licenses/by-nc-nd/3.0/br/BiomassaCelulosePré-tratamentoDerivatizaçãoCarboximetilcelulosePlanejamento experimentalQuímica do PetróleobachelorThesisCNPQ::CIENCIAS EXATAS E DA TERRA