改性2AlCl_3-Et_3 NHCl离子液体催化C_4烷基化反应  

Alkylation of C_4 in Modified 2AlCl_3-Et_3 NHCl Ionic Liquid

作　　者：任鹏举[1] 黄崇品[1] 张傑[1] 乔聪震[1] 

机构地区：[1]北京化工大学化工资源有效利用国家重点实验室,北京100029

出　　处：《河南大学学报（自然科学版）》2006年第1期37-40,共4页Journal of Henan University:Natural Science

基　　金：国家自然科学基金重大项目(20490209)

摘　　要：向2AlCl3-Et3NHCl离子液体中分别加入二硫化碳、丁基硫醇、二甲基硫醚和丙酮,考察了其对离子液体催化异丁烷/2-丁烯烷基化性能的影响.在相同反应条件下,以二硫化碳和丁基硫醇改性的离子液体的催化性能优于未改性离子液体:烷基化产品中的C8组分含量由49.7%分别提高到68.6%和79.2%,TMP(三甲基戊烷)/DMH(二甲基己烷)从0.92分别提高到5.81和4.07.采用乙腈探针红外光谱法测定了离子液体酸性,发现改性后离子液体的路易斯酸强度均有所降低,不同助剂对离子液体的路易斯酸强度的影响也有差别.2AlCl3-Et3NHCl离子液体改性前后的27Al核磁共振波谱表明:Al2Cl7-量的下降导致了改性离子液体酸强度的减弱,其催化性能提高可以归因于加入的助剂在离子液体中形成的新配合物.The paper studies the effects of organic additives such as carbon bisulfide（CS2 ）, butyl sulfhydrate（C4 H10 S）, dimethyl sulfide（C2 H6S） and acetone（Ca H6 O）on the catalytic properties of 2AlCl3-Et3NHCl ionic liquids for alkylation of isobutane with 2-butene. The alkylates catalyzed by 2AlCl3-Et3NHCl /CS2 and 2AlCl3-Et3NHCl /C4 H10 S ionic liquids showed significant improvement of product distribution with constitute of C8 increasing from 49.7% to 68.6 % and 79.2 %, the TMP（trimethylpentane）/DMH （dimethylhexane） enhancing from 0.92 to 5.81 and 4.07 respectively in the same reaction conditions. Using acetonitrile as the probe molecule, 2AlCl3-Et3NHCl ionic liquids modified with various additives showed difference in their Lewis acidity based on the FT-IR characterizations. From the ^27Al NMR investigations, it reveals that the decrease of acid strength of the modified ionic liquids comes from the decrease of Al2Cl7^-, and the improvements of catalytic properties of ionic liquids can be attributed to the new complex formed from the additives.

关 键 词：离子液体 改性 异丁烷 2-丁烯 烷基化 

分 类 号：O69[理学—化学]