Banca de DEFESA: RENATO DANTAS LUZ PEIXOTO

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : RENATO DANTAS LUZ PEIXOTO
DATE: 19/02/2020
TIME: 15:00
LOCAL: Sala de aula do LAPET
TITLE:

EVALUATION OF POTENTIAL OF UNSYMMETRICAL CARBONATES AS ORGANIC BASE IN NON‑AQUEOUS DRILLING FLUIDS

KEY WORDS:

Carbonate. Ester. Organic base. Drilling fluids

PAGES: 60
BIG AREA: Ciências Exatas e da Terra
AREA: Química
SUBÁREA: Química Orgânica
SPECIALTY: Síntese Orgânica
SUMMARY:

Low toxicity and considerable biodegradability are responsible by the inclusion of vegetable esters-based fluids as an altern ative environmentally correct for oil wells drilling, according to environmental agencies regulations. However, the physicochemical properties of the fatty esters result in limited applications in synthetic base fluids. The use of unsymmetrical carbonates can be considered a viable alternative, as they present several advantages over esters, such as greater thermal oxidative stability and compatibility with various elastomers. In addition, the products formed during its hydrolysis are not detrimental to rh eological properties of fluids. Additionally, they tend to have high biodegradability, since they are structurally similar to vegetable esters. Thus, the aim of this work is to synthesize unsymmetrical carbonates by the reaction between decan-1-ol and dimethyl carbonate using KOH as catalyst, and to evaluate the potential of asymmetrical carbonates as organic base in non aqueous drilling fluids. The employment of babassu esters served as a comparative for the work. The infrared spectrum provided the structural information presenting the two most important characteristics in the asymmetrical carbonates spectrum, the strong band of the carbonyl group (C═O), which appears at 1749 cm^-1, and the presence of intense absorption at 1261 cm^-1 of the CꟷO stretch. Due to the low pour point (−4.5 °C), fluids formulated with this organic compound probably will not freeze in the regions near the Blowout Preventer during deepwater drilling. Transport, storage and use is safe as it has a high flash point (128 °C). The relatively low kinematic viscosity (3.2 cSt) revealed this compound as promising in the formulation of non-aqueous fluids. The fluid performance, evaluated by laboratory tests (rheological parameters, electrical stability and filtrate), showed that this carbonate represents a real alternative for application in invert emulsion fluids in substitution to other organic bases. Thus, limitations on the use of ester-based drilling fluids can be suppressed by employing asymmetric carbonates as continuous phase.

BANKING MEMBERS:
Externa à Instituição - ANNE GABRIELLA DIAS SANTOS - UERN
Externo à Instituição - MARCUS VINICIUS GOMES PAIXÃO
Interna - 1149440 - ROSANGELA DE CARVALHO BALABAN
Externa ao Programa - 1523912 - TATIANA DE CAMPOS BICUDO