Banca de QUALIFICAÇÃO: PRISCILA DE ALMEIDA SILVA

Uma banca de QUALIFICAÇÃO de MESTRADO foi cadastrada pelo programa.
STUDENT : PRISCILA DE ALMEIDA SILVA
DATE: 14/01/2022
TIME: 14:00
LOCAL: Campus Gameleira
TITLE:

KETALIZATION OF ETHYL LEVULINATE FOR THE PRODUCTION OF POTENTIAL BUILDING BLOCKS IN ORGANIC SYNTHESIS

KEY WORDS:

Ethyl levulinate. Pentaerythritol. MOF. Ketalization.

PAGES: 70
BIG AREA: Ciências Exatas e da Terra
AREA: Química
SUBÁREA: Química Inorgânica
SPECIALTY: Campos de Coordenação
SUMMARY:

The intensification of environmental pollution caused by the constant consumption of fossil products has been driving the development of substitutes from sustainable sources, such as those derived from lignocellulosic biomass. The objective of this work is to synthesize an organic compound with the potential to be used as a building block in organic syntheses from the biomass derivative ethyl levulinate, through the ketalization reaction using the polyalcohol pentaerythritol in the presence of two types of catalysts, the metal-organic network MOFNb/BDC metal-organic framework based on commercial terephthalic acid and niobium) developed by our research group and the commercial cationic resin Amberlyst®15.
The development and characterization of MOF-Nb/BDC was the object of study by our research group, and since this material proved to be very promising as a catalyst, it was chosen for testing in ketalization reactions within the scope of this dissertation. The cationic resin Amberlyst® will be a model catalyst, as the literature correlates its use with high rates of conversion and selectivity for the formation of the ketal group, when used for ketalization of ethyl levulinate using other polyalcohols. The present work consists of four steps, the first of which is the synthesis of the MOF-Nb/BDC catalyst, which was carried out using the reflux system. The second step was the characterization of the catalysts, using the following techniques: i) Fourier transform infrared (FTIR), ii) Thermogravimetry (TG), and iii) X-Ray Diffraction. Through the FTIR technique, it was possible to observe evidence of the occurrence of coordination of the ligand to the metal. The material had an acidity of 0.94 mmolH+ g-solid-1 and therefore has a more moderate acidity when compared to Amberlyst® 15 (4.42 mmolH+ g-solid-1). The commercial cationic resin Amberlyst15 was also characterized, showing all the characteristics in accordance with the literature and the information provided by the manufacturer. The next step of the work will be the synthesis of ethyl levulinate ketal with pentaerythritol polyalcohol, under different reaction conditions, using the DeanStark system. The effectiveness of the reaction will be measured by the disappearance of the ketone function of ethyl levulinate, through the FTIR technique.

BANKING MEMBERS:
Presidente - EUDES LORENCON
Externo ao Programa - CLEVERSON FERNANDO GARCIA