Banca de QUALIFICAÇÃO: JOSÉ DEMÉTRIO NERY CAVALCANTE

Uma banca de QUALIFICAÇÃO de DOUTORADO foi cadastrada pelo programa.
STUDENT : JOSÉ DEMÉTRIO NERY CAVALCANTE
DATE: 27/12/2023
TIME: 14:00
LOCAL: Virtual
TITLE:

HYDROTHERMAL PROCESSING FOR CONVERTING CORN COB INTO 2G ETHANOL AND HIGH-VALUE CHEMICALS

KEY WORDS:

Corn cob, hydrothermal pretreatment, 2G ethanol, chemicals.

PAGES: 34
BIG AREA: Engenharias
AREA: Engenharia Química
SUBÁREA: Tecnologia Química
SPECIALTY: Tratamentos e Aproveitamento de Rejeitos
SUMMARY:

The processing of agro-industrial goods by industries around the world generates large levels of waste, discarded inappropriately and/or without taking full utilization of their characteristics. Lignocellulosic biomass is one of these types of waste that is poorly used, serving only as power supply by burning or soil fertilization. The proposals of current biorefineries are to provide efficient use of the biomass composition in the production of biofuels and high-value chemical products. The polymers that form biomass vegetable origin, when properly processed, allow the formulation of bioethanol. One of the alternative routes is hydrothermal pretreatment processing. The method consists of using water as a solvent in a reaction medium at high temperatures and pressures. Water under these conditions acts as a catalyst, weakening and fragmenting the polymeric chains of the biomass, allowing it to be used easily. As a way of evaluating the valorization of biomass as a whole, different routes of hydrothermal pretreatments and hydrothermal liquefaction of corn cobs are proposed, as well as a mathematical modeling of the processes involved. Hydrothermal pre-treatment in an oil bath system will be carried out, aiming to analyze the structural changes caused by the process under different operating conditions. The release of fermentable sugars and the potential for generating 2G ethanol through Saccharification and Simultaneous Fermentation will be the main objective of the stage. Hydrothermal pretreatment in a one-pot system will be the next step, studying different temperature conditions. In order to intensify the processing of corn cobs, the sequential application of different aqueous solvents in the process will occur, to obtain more purified solutions of chemicals arising from the degradation of each biomass-forming polymer. Determining the condition for maximizing the generation of isolated xylooligosaccharides, phenolic compounds and cellulose will be the focus point of the stage. The production of bio-oil and biochar through hydrothermal liquefaction will follow. Variations in temperature and pressure conditions will be applied to the process and their impact on the characteristics of the material obtained will be evaluated. As well as different bio-oil extraction strategies using different conditions and organic solvents. The analysis of treated and untreated biomass will follow protocols and techniques already consolidated in the literature (NREL protocols, HPLC, DRX, FTIR, GC-MS). Process modeling will conclude the studies, with the purpose of analyzing the scale-up of optimized process conditions.

COMMITTEE MEMBERS:
Presidente - 1584174 - DOMINGOS FABIANO DE SANTANA SOUZA
Interno - 3304882 - CARLOS EDUARDO DE ARAÚJO PADILHA
Interno - 1547970 - JACKSON ARAUJO DE OLIVEIRA