Banca de QUALIFICAÇÃO: JOSE DALADIE BARRETO DA COSTA FILHO

Uma banca de QUALIFICAÇÃO de DOUTORADO foi cadastrada pelo programa.
STUDENT : JOSE DALADIE BARRETO DA COSTA FILHO
DATE: 21/12/2023
TIME: 14:00
LOCAL: Virtual
TITLE:

VALORIZATION OF LIGNIN RECOVERED FROM THE SECOND GENERATION ETHANOL PRODUCTION PROCESS FROM PRE-TREATED MAIZE COBS

KEY WORDS:

Lignin, nanoparticles, sunscreen

PAGES: 44
BIG AREA: Engenharias
AREA: Engenharia Química
SUBÁREA: Tecnologia Química
SPECIALTY: Produtos Naturais
SUMMARY:

In one year, about 223 million tons of biomass are processed, generating 62 million tons of lignin, which is considered a low-value by-product, commonly burned for energy generation. However, techno-economic analyzes point out that the energy demand of a regular biorefinery requires only about 40% of the lignin produced. Thus, alternative applications of lignin need to be explored for its real appreciation. The use of lignin as a biopolymer for the formation of nanoparticles or coating in nanocomposites has gained attention in recent years mainly due to its stable structure and the presence of multiple functional groups. Given this context, the objective of this work will be the extraction of lignin from the corn cob, as well as its application for the development of nanoparticles through the modification of solubility using water as an antisolvent in an atomization reactor. The recovery of lignin will be carried out from the organosolv-oxidative pre-treatment, in addition, the partial replacement of the liquor will be evaluated regarding the possibility of cost reduction in new pre-treatment steps so that it does not harm the enzymatic digestibility and allows the biopolymer recovery. In addition to the lignins obtained from pre-treatments with and without recycling, the lignin from the enzymatic hydrolysis of the pre-treated cob will also be recovered. These solids will be used for the synthesis of nanoparticles via precipitation with an atomization reactor, whose process variables will be the injection rates of compressed air and lignin solubilized in ethanol. It is expected to obtain an optimized condition through the use of a central rotational composite design, in order to synthesize well-defined and uniformly sized nanostructures. Once the process variables that best generate the nanoparticles have been defined, their use in the formulation of sunscreens that allow an increase in the UV protection factor is proposed. Furthermore, the formulations will be analyzed for photostability and thermostability.

COMMITTEE MEMBERS:
Presidente - 1584174 - DOMINGOS FABIANO DE SANTANA SOUZA
Interno - 3304882 - CARLOS EDUARDO DE ARAÚJO PADILHA
Interna - 1979301 - RENATA MARTINS BRAGA