溶胶-凝胶法负载离子液体[hnmp]HSO_4催化剂在酯化反应中的应用  

Silica-gel-supported ionic liquid [hnmp]HSO_4 as a catalyst for esterification reaction

作　　者：劳锡寮[1] 方岩雄[1] 周蓓蕾[1] 黄宝华[1] 张焜[1] 

机构地区：[1]广东工业大学轻工化工学院,广东广州510006

出　　处：《化工进展》2009年第11期1941-1945,共5页Chemical Industry and Engineering Progress

基　　金：国家自然科学基金(20376015);广东省自然科学基金(32491);广州市科技计划(2004J1-C0151)资助

摘　　要：由溶胶-凝胶法负载Brnsted酸性离子液体N-甲基吡咯烷酮硫酸氢盐([hnmp]HSO4),得到硅胶负载离子液体(SILC)。用SILC作为催化剂,研究了一系列醇酸的酯化反应,在没有带水剂存在下,最高酯收率可以达到69%,TOF可以达到1350h-1。催化剂重复使用8次未见活性明显降低,具有较好的重复使用性。分析结果表明,离子液体已较好地负载于硅胶上,其中约7%的离子液体与硅胶结合紧密牢固。负载离子液体催化剂的用量明显比纯离子液体催化剂的用量少,有效降低了催化剂成本,有望在固定床反应器中使用。Bronsted acidic ionic liquid N-methyl pyrrolidonium hydrosulfate （[hnmp]HSO4） was immobilized in silica gel by sol-gel method. The silica-gel-supported ionic liquid catalyst （SILC） was used as a new kind of cheap and accessible catalyst in esterification reactions. Without dehydrant, the yield of butyl acetate reaches to 69 %, and the turnover frequency （TOF） is 1350 h^-1. After the SILC was recycled for 8 times, the ester yield of the reaction was basically similar to that obtained with the freshly prepared catalyst. According to the analysis of TG-IR, about 7 % ionic liquid was strongly adsorbed in silica-gel. The products separation using SILC was convenient. It is presumed that the SILC can be used in the fixed-bed process.

关 键 词：离子液体 硅胶负载 溶胶-凝胶法 酯化反应 催化剂 

分 类 号：TQ426.6[化学工程]