Banca de QUALIFICAÇÃO: HUGO GABRIEL BARBOSA SILVA

Uma banca de QUALIFICAÇÃO de MESTRADO foi cadastrada pelo programa.
STUDENT : HUGO GABRIEL BARBOSA SILVA
DATE: 21/08/2024
TIME: 14:30
LOCAL: https://meet.google.com/xzn-ydpk-its
TITLE:

SYNTHESIS OF MONOESTERS DERIVATED FROM GLYCEROL IN DEEP EUTECTIC SOLVENTS AND APPLICATIONS AS DUST SUPPRESSANTS

KEY WORDS:

Esterification, glycerol, Box-Behnken Design

PAGES: 30
BIG AREA: Ciências Exatas e da Terra
AREA: Química
SUBÁREA: Química Orgânica
SPECIALTY: Síntese Orgânica
SUMMARY:

Glycerol, or glycerin, is a polyol found in triglycerides. Its derivative, glycerol monoester, has various applications: in the cosmetic industry, it improves skin hydration and elasticity; in the pharmaceutical industry, it acts as a solvent and lubricant; in the food industry, it is used as a sweetener and humectant; and in the industrial sector, it is employed in the production of biopolymers, renewable fuels, and dust control on unpaved roads, highlighting its efficiency and environmental impact. The classical esterification of glycerol faces challenges due to the use of toxic organic solvents and acidic catalysts such as phosphoric acid and sulfuric acid. In this study, a new methodology was developed using p-toluenesulfonic acid and deep eutectic solvents as sustainable alternatives. To ensure mathematical precision, the regression model of the Box-Behnken Design experimental planning was applied to determine the optimal reaction conditions. The synthesis of glycerol benzoate was studied at 110 °C for 4 hours, using choline chloride and oxalic acid as deep eutectic solvents and p-toluenesulfonic acid as the acid catalyst (50% mol of the carboxylic acid), achieving a yield of 54%. Additionally, the reaction scope was investigated with lauric acid, achieving a yield of 52%. This approach offers an eco-friendlier alternative for the esterification of glycerol, contributing to advances in green chemistry. Future perspectives include expanding the reaction scope by synthesizing esters with carboxylic acids of different structures and applying these materials as dust suppressants in mining.

BANKING MEMBERS:
Externo à Instituição - IVES ANTONIO LEONARCZYK
Presidente - 1222623 - MARCELO SIQUEIRA VALLE