Banca de DEFESA: CAROLINE SUZY DO NASCIMENTO GARCIA

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
DISCENTE : CAROLINE SUZY DO NASCIMENTO GARCIA
DATA : 03/03/2017
HORA: 10:00
LOCAL: LAPET - Laboratório de Pesquisa em Petróleo
TÍTULO:

STARCH LAURATE OBTAINED FROM STARCH EXTRACTED THE SEED OF MANGA TOMMY ATKINS: SYNTHESIS, CHARACTERIZATION AND APPLICATION IN NON-AQUEOUS DRILLING FLUIDS.

PALAVRAS-CHAVES:

starch, transesterification, vinyl laurate. Drilling fluid, invert emulsion (W/O), fluid loss control.

 

PÁGINAS: 97
GRANDE ÁREA: Engenharias
ÁREA: Engenharia de Materiais e Metalúrgica
SUBÁREA: Materiais Não-Metálicos
ESPECIALIDADE: Polímeros, Aplicações
RESUMO:

After processing of mango in pulp and juices industries, tons of residues such as shell and seed are discarded without proper use. About 15% to 20% of the weight of the mango, depending on its variety, is due to the seed, from which it is possible to obtain the starch. In order to add value to this residue, this study aimed to produce an ester from mango starch (Tommy Atkins), through the transesterification reaction of vinyl laurate (LV) with starch. The synthesis was performed in the presence of a basic catalyst (K₂CO₃) in dimethyl sulfoxide (DMSO) at 110 ° C and N₂(g). The product was purified by precipitation in methanol and characterized by Fourier Transform Infrared Spectroscopy (FTIR), thermal gravimetric analysis (TGA), solubility tests and scanning electron microscopy (SEM). FTIR confirmed the starch laurate was obtained, by displacing the C=O band from the vinyl ester at 1759 cm^-1, to 1743 cm^-1 in vinyl laurate, due to satured ester in the modified starch. ¹H NMR indicated that the starch laurate showed a degree of chemical modification at 1.13 and ¹³C NMR showed a signal at 173 ppm, which can be attributed to the carbonyl of the starch laurate. Thermogravimetric analysis showed that the modified starch has higher thermal stability than its precursors and than a physical blend of starch and vinyl laurate. Solubility tests also confirmed the chemical modification, since, unlike the starch, the product was soluble in toluene and chloroform, and remained insoluble in water and DMSO. SEM data showed that crystalline domains on starch were broken after chemical modification and the appearance shown in micrograph is unstructured (amorphous). From the hydrophobic starch product obtained the present work sought the use of this starch in petroleum well drilling fluids based on invert emulsion (W/ O), due to the high interest in developing non-aqueous fluids of low toxicity and high performance under very high temperature and pressure conditions. The physical-chemical experimental results of the studied fluids indicate that the obtained product of the synthesis presented similar performance to the fluid with commercial additive in the control of the filtrate.

MEMBROS DA BANCA:
Presidente - 1639676 - EDSON NORIYUKI ITO
Externo ao Programa - 1149440 - ROSANGELA DE CARVALHO BALABAN
Externo à Instituição - MARCOS ANTONIO VILLETTI - UFSM
Externo à Instituição - NÍVIA DO NASCIMENTO MARQUES - UFRN