Síntese de líquidos iônicos N-Alquil-N-Aril-Imidazólicos e estudo exploratório de suas aplicações na indústria do petróleo

Abstract

In this work, a new class of ionic liquids has been prepared by Radziszewski’s reaction from aromatic amines resulting in N-aryl substituted imidazols. Alkylation of these compounds by either mesylates or tosylates generated aryl alkyl ionic liquids which by metathese reaction formed ionic liquids with tetrafluoroborate, hexafluorophosphate, bis(trifluoromethylsulfonyl)amide or 1,1,2,2,3,3,4,4,4-nonafluorbutanosulfonate anions. Reaction yields range from moderate to good.Nitrogen or sulfur extraction capabilities of the ionic liquids prepared were evaluated using a solution of nitrogen or sulfur compound in n-dodecane as a model oil. Good results were obtained when p-nitro aryl substituted ionic liquid was used with a 99.93 % removal of the nitrogen compound (acridine) and 72.88 % of sulfur compound (dibenzothiophene) whereas extraction with dialkyl imidazole ionic liquids (1-butyl-3-methylimidazol) resulted in 62.35 and 37.96% removal, respectively.Additionally, demulsifying action of the p-nitro aryl ionic liquid was tested on a medium crude (oAPI 27.4) with 5.60% emulsified water. Despite high efficiency on water removal on preliminary tests, further work is necessary due to deposition of solid material.