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采用两步法合成了[Bmim]HSO_4,[Bmim]Sb F6,Bmim]PF6,[BSmim]HSO_4,[BSmim]CF_3SO_3,[BSN222]H_2PW_12O_40,[Ph3PSO3H]HSO_4等离子液体,以离子液体及离子液体/酸性无机盐为催化剂,在90℃、混合碳四:乙酸体积比18:5、乙酸:催化剂摩尔比2、反应时间4 h条件下,催化丁烯与乙酸的酯化反应.结果表明,以[Ph_3PSO_3H]HSO_4为催化剂时,丁烯转化率、乙酸仲丁酯的选择性和收率分别达88.8%,100.0%和88.8%,远高于以浓H_2SO_4催化的转化率(73.5%)、选择性(77.7%)和收率(57.1%).以[Ph_3PSO_3H]HSO_4为催化剂的8次循环实验中,总丁烯转化率均大于88.4%,乙酸仲丁酯选择性均大于97.4%,且产物与离子液体易分离,催化效果和循环使用性能良好.
[Bmim] HSO_4, [Bmim] Sb F6, Bmim] PF6, [BSmim] HSO_4, [BSmim] CF_3SO_3, [BSN222] H_2PW_12O_40 and [Ph3PSO3H] HSO_4 were synthesized by a two-step method using ionic liquid and ionic liquid / Acidic inorganic salt was used as the catalyst to catalyze the esterification of butene and acetic acid under the conditions of 90 ℃, mixed carbon tetraacetate: acetic acid volume ratio 18: 5, acetic acid: catalyst molar ratio 2 and reaction time 4 h. The conversion of butene and the selectivity of sec - butyl acetate were 88.8%, 100.0% and 88.8%, respectively, which were much higher than those of H_2SO_4 catalyzed conversion (73.5%), selectivity (77.7%) and yield (57.1%), respectively.Under eight cycles of [Ph_3PSO_3H] HSO_4 as catalyst, the conversion of total butenes was more than 88.4% and the selectivity of sec-butyl acetate was more than 97.4% Ionic liquid easy separation, catalytic effect and recycling performance is good.