https://repositorio.ufpb.br/jspui/handle/123456789/11127 2026-04-08T13:41:40Z https://repositorio.ufpb.br/jspui/handle/123456789/36258 Título: INFLUÊNCIA DA GRANULOMETRIA NA SACARIFICAÇÃO E FERMENTAÇÃO NA PRODUÇÃO DE ETANOL DE MILHO Autor(es): SIQUEIRA SEGUNDO, PEDRO ANDRÉ DE Orientador: VASCONCELOS, SOLANGE MARIA DE Abstract: This study aimed to evaluate the influence of corn particle size on ethanol production, considering the liquefaction, saccharification, and alcoholic fermentation stages. Ground corn samples with sieved granulometry (20 Mesh) and unsieved granulometry were used, subjected to the addition of 0.32 mL of αamylase at 90°C and 0.32 mL of glucoamylase at 60°C, followed by fermentation with Saccharomyces cerevisiae (FT858L) at 30°C, 150 rpm, in a shaker incubator for 24 hours. The experiments were carried out on a laboratory scale, monitoring parameters such as starch content, soluble solids (°Brix), and alcohol content. The results showed that particle size variation did not promote significant differences in saccharification or fermentation, since both samples presented very similar soluble solids (°Brix) during saccharification, as well as close alcoholic content (°GL) and productivity, with mean values between 1.33 and 1.55 g/L for the sieved sample and 1.91 and 1.98 g/L for the unsieved sample. The average efficiency of the processes, regarding ethanol production based on processed starch dry mass, ranged from 43.97 to 47.27%. Under the conditions evaluated in this work, the use of standardized or heterogeneous corn particle size was not a limiting factor for ethanol production, reinforcing the importance of commercial enzymes and fermentation process standardization as key determinants for yield. Editor: Universidade Federal da Paraíba Tipo: TCC 2025-09-29T00:00:00Z https://repositorio.ufpb.br/jspui/handle/123456789/36215 Título: SIMULAÇÃO DA DESTILAÇÃO EXTRATIVA PARA PRODUÇÃO DE ETANOL ANIDRO: INFLUÊNCIA DO TEOR DE LÍQUIDO IÔNICO [EMIN][Ac] EM MISTURA COM ETILENOGLICOL SOBRE O DESEMPENHO ENERGÉTICO DO PROCESSO Autor(es): SILVA, AMANDA VITORIA EVANGELISTA DA Orientador: VASCONCELOS, ANGELA LUCÍNIA URTIGA Abstract: A destilação extrativa é uma técnica amplamente utilizada para superar as limitações impostas pelos azeótropos, como no caso do sistema etanol-água, cuja mistura apresenta comportamento azeotrópico que impede a obtenção de etanol anidro apenas por destilação simples. Tradicionalmente, o etilenoglicol tem sido empregado como agente de arraste (entrainer) nesse processo, devido à sua alta seletividade e capacidade de alterar a volatilidade relativa entre etanol e água. No entanto, o uso do etilenoglicol apresenta desvantagens significativas, incluindo alto ponto de ebulição, maior consumo energético para recuperação do solvente, potencial toxicidade ambiental e dificuldades de manuseio e descarte. Os líquidos iônicos se enquadram como alternativas promissoras para a destilação extrativa. Esses compostos apresentam baixa pressão de vapor, alta estabilidade térmica e podem ser projetados para oferecer seletividade adequada, reduzindo emissões e impactos ambientais. Assim, este trabalho tem como objetivo na metodologia, foi desenvolvido um modelo de simulação no Aspen Plus, adotando o modelo termodinâmico NRTL para representar o comportamento de sistemas não ideais. A partir dele, foram analisados diferentes cenários, alterando-se a proporção entre etilenoglicol e o líquido iônico [EMIM][Ac]. Os resultados indicaram que a concentração de 20% de [EMIM][Ac] e 80% de etilenoglicol apresentaram um melhor desempenho representado no caso 3 ou seja, quantidades moderadas do líquido iônico proporcionaram maior pureza do etanol e menor consumo específico de energia (SEC). Editor: Universidade Federal da Paraíba Tipo: TCC 2025-01-29T00:00:00Z https://repositorio.ufpb.br/jspui/handle/123456789/36214 Título: SIMULAÇÃO DA DESTILAÇÃO EXTRATIVA PARA PRODUÇÃO DE ETANOL ANIDRO: INFLUÊNCIA DO TEOR DO LÍQUIDO IÔNICO [EMIM][BF₄] EM MISTURA COM ETILENOGLICOL SOBRE O DESEMPENHO ENERGÉTICO DO PROCESSO Autor(es): SILVA, ANA BEATRIZ DA Orientador: VASCONCELOS, ANGELA LUCÍNIA URTIGA Abstract: Anhydrous ethanol is a strategic product for the energy and chemical sectors, but obtaining it in high purity is hampered by the presence of the ethanol-water azeotrope, which makes separation by conventional distillation impossible. Among the alternatives employed, extractive distillation stands out, particularly due to the use of solvents that modify the vaporliquid equilibrium. In this context, ionic liquids have been studied as more sustainable replacements for traditional solvents, such as ethylene glycol (EG). This work aimed to simulate and evaluate the extractive distillation of the ethanol-water system using ethylene glycol (EG) and the ionic liquid 1-ethyl-3-methylimidazolium tetrafluoroborate ([EMIM][BF₄]) as solvents. To this end, a flowchart representing the industrial process was developed in Aspen Plus, adopting the NRTL thermodynamic model to calculate vapor-liquid equilibrium. Different proportions of [EMIM][BF₄] and EG were analyzed, evaluating their influence on anhydrous ethanol purity, reboiler and condenser thermal loads, and specific energy consumption (SEC). The results showed that ethanol purity at the top of the column remained in the range of 0.995 up to approximately 40% [EMIM][BF₄], a condition considered optimal. In this range, a maximum reduction in the total reboiler load to approximately 63.2 kW and a lower SEC value of 0.682 kWh/kg were observed, indicating significant energy gains compared to cases with a lower amount of ionic liquid. At higher concentrations, above 50% IL, a purity reduction specification (decrease to ≈0.994) and an increase in overall energy consumption were observed, compromising the process viability. It is concluded that the combined use of EG and [EMIM][BF₄] can improve the energy efficiency of extractive distillation, with the 40% IL and 60% EG scenario being the most promising, as it combines lower energy consumption with maintained product quality. The study also highlights the potential of ionic liquids as alternative entrainers, although additional economic and environmental analyses are needed for industrialscale validation. Editor: Universidade Federal da Paraíba Tipo: TCC 2025-09-26T00:00:00Z https://repositorio.ufpb.br/jspui/handle/123456789/36190 Título: DA VINHAÇA AO BIOGÁS: AVALIAÇÃO DO SEU POTENCIAL ENERGÉTICO EM TRÊS NÍVEIS DE DILUIÇÃO Autor(es): NASCIMENTO, ANALYCE GALDINO DO Orientador: JAGUARIBE, DANIELLE CHRISTINE ALMEIDA Abstract: Vinasse is one of the main liquid wastes generated in the sugarcane and ethanol industry, characterized by its high organic load and polluting potential. On the other hand, it presents a promising substrate for anaerobic digestion, enabling the generation of biogas and contributing to the energy recovery of agro-industrial waste. This study aimed to evaluate biogas production from sugarcane vinasse on a laboratory scale, analyzing different inoculum proportions and three pH conditions 6, 7, and 8. Tests were conducted in experimental biodigesters, monitored by attached balloons to verify gas generation. The physicochemical characterization of the vinasse confirmed its viability as a substrate, while practical tests showed greater evidence of production in biodigesters maintained at pH 8. However, balloon ruptures compromised continued monitoring, resulting in inconclusive data on biogas yield and composition. Even given these limitations, the study reinforces the potential of vinasse as a raw material for renewable energy generation, highlighting the importance of pH control for process stability and the need for improvements in experimental infrastructure. The study concludes that anaerobic digestion can represent a sustainable alternative for the sugar and ethanol industry, contributing to the reduction of environmental impacts and the energy recovery of industrial waste. Editor: Universidade Federal da Paraíba Tipo: TCC 2025-09-29T00:00:00Z