“…Isobutene (IB) , butanol [25,[49][50][51][52][53][54][55][56][57][58][59][60][61][62][63][64][65]70], glycerol [66][67][68][69], and refinery fractions [40,71] were used for the etherification reaction as alkylation agents. Among these routes, the etherification of glycerol with IB and butanol is important as the reaction products can be directly blended with fuels.…”