Two Acid sites PEG thermoregulated ionic liquid was prepared and used as the catalyst for the esterification of aromatic acid and alcohol.The yield of esterification catalyzed by ionic liquid was 99% in 1 h at 80 ℃ w...Two Acid sites PEG thermoregulated ionic liquid was prepared and used as the catalyst for the esterification of aromatic acid and alcohol.The yield of esterification catalyzed by ionic liquid was 99% in 1 h at 80 ℃ with 0.1%(molar fraction)acidic PEG ionic liquid.The catalyst system could be applied to a wide range of esterification of aromatic acids and alcohols.The ionic liquid has the advantages of both homogeneous and heterogeneous phase at different temperature with a high product yield and the ease of product as well as catalyst separation.The ionic liquid studied plays the role of catalyst and is recycled up to seven times without any significant loss of activity.Morover,by simple phase separation the ionic liquid phase could be re-utilized up to seven times without leaching.展开更多
用HNIL.NO3-和HNIL.HSO4-新型酸性离子液体为Lewis酸催化剂,考察了催化剂种类、用量、硝化反应时间、温度、醋酐等因素对甲苯选择性硝化反应的影响,并研究了催化剂的循环使用效果。结果表明,醋酐存在条件下,以CCl4为溶剂、95%发烟硝酸...用HNIL.NO3-和HNIL.HSO4-新型酸性离子液体为Lewis酸催化剂,考察了催化剂种类、用量、硝化反应时间、温度、醋酐等因素对甲苯选择性硝化反应的影响,并研究了催化剂的循环使用效果。结果表明,醋酐存在条件下,以CCl4为溶剂、95%发烟硝酸为硝化剂,温度控制在55℃,反应60 min,3.0 g HNIL.HSO4-新型酸性离子液体催化剂对甲苯硝化表现出较强的区域选择性,产物收率达到99.4%,硝化产物邻位和对位异构体的重量比达1.12,较硝硫混酸的1.67显著降低。该催化剂可循环使用5次,催化活性变化很小。展开更多
文摘Two Acid sites PEG thermoregulated ionic liquid was prepared and used as the catalyst for the esterification of aromatic acid and alcohol.The yield of esterification catalyzed by ionic liquid was 99% in 1 h at 80 ℃ with 0.1%(molar fraction)acidic PEG ionic liquid.The catalyst system could be applied to a wide range of esterification of aromatic acids and alcohols.The ionic liquid has the advantages of both homogeneous and heterogeneous phase at different temperature with a high product yield and the ease of product as well as catalyst separation.The ionic liquid studied plays the role of catalyst and is recycled up to seven times without any significant loss of activity.Morover,by simple phase separation the ionic liquid phase could be re-utilized up to seven times without leaching.
文摘用HNIL.NO3-和HNIL.HSO4-新型酸性离子液体为Lewis酸催化剂,考察了催化剂种类、用量、硝化反应时间、温度、醋酐等因素对甲苯选择性硝化反应的影响,并研究了催化剂的循环使用效果。结果表明,醋酐存在条件下,以CCl4为溶剂、95%发烟硝酸为硝化剂,温度控制在55℃,反应60 min,3.0 g HNIL.HSO4-新型酸性离子液体催化剂对甲苯硝化表现出较强的区域选择性,产物收率达到99.4%,硝化产物邻位和对位异构体的重量比达1.12,较硝硫混酸的1.67显著降低。该催化剂可循环使用5次,催化活性变化很小。
