合成MTBE新催化精馏分子筛催化剂研究

The etherification reaction of isobutene and methanol to form MTBE (methyl tert-butyl ether) is important commercial reaction. The catalyst is strongly acidic ion exchange resin. Because of some defects of resin itself, the efforts of using zeolite catalyst instead of resin have been lasted for years. But it dose not solve well so far. In this research, it was revealed that the diffusion is most important factor for etherification reaction over zeolite catalyst under low temperature and it is critical for enhancing low temperature etherification activity to decrease diffusion resistance of molecule and to use adequately activity sites in zeolite catalyst. It is avail to decrease crystal size for enhancement of catalytic activity. The combining microwave radiation aging and hydrothermal synthesis was used to prepare ultra-fine ZSM-5. The similar activity to acid resin was observed at 80℃ over base leaching activation ultra-fine ZSM-5. The zeolite Beta with more large pore size and more opening structure showed higher low temperature etherification activity than one of ZSM-5. The influence of the synthesis of Beta and the conditions of catalyst preparation, including calcinations procedure, ion exchange and binding etc, on the activity was investigated systematically. It was revealed that the activity directly had respect to Br?nsted acid sites and the removal of extra-framework Al by acid leaching caused an obvious growing in low temperature activity. A new low costs method was investigated for the synthesis of zeolite Beta. The zolite catalyst have been prepared with competitive activity and production costs to A-35 acid resin.

研究合成MTBE新型分子筛-精馏填料一体化催化精馏催化剂的制备规律。侧重研究有控合成叽缡识鹊某⒘７肿由傅姆椒āＱ芯刻岣咚嶂行那慷确椒ǎ胖匮芯坑糜谐克嵝阅艿难趸锔男苑肿由福⒀芯炕钚灾行慕峁梗嵝栽銮炕啤１狙芯拷铣蒑TBE的新型高效催袅蟠呋恋难兄铺峁┗。兄卮缶靡庖宀⒔惺呋蒲ё鞒龉毕住