β/MCM-49分子筛烷基转移催化剂生产及应用

Production and Application of β/MCM-49 Molecular Sieve Transalkylation Catalyst

采用8m3高压反应釜生产了β分子筛和MCM-49分子筛,进一步制备了β/MCM-49分子筛烷基转移催化剂,考察了分子筛结构和酸性对烷基转移反应的影响。通过X射线衍射(XRD)、氨气程序升温脱附(NH3-TPD)等表征方法测定了催化剂的结构和酸性,并进行了小试活性评价和年产12万吨苯酚丙酮生产装置合成异丙苯烷基转移单元上工业应用稳定性研究。结果表明,合成的催化剂兼具有β分子筛和MCM-49分子筛结构特征,具有适宜的强酸和弱酸酸量;催化多异丙苯转化率高,产物正丙苯含量少。该催化剂在苯酚丙酮工业生产装置合成异丙苯烷基转移单元中,在185~196℃、多异丙苯(二异丙苯+三异丙苯)质量空速(WHSV)为0.5~0.9 h^(-1)条件下进行了工业运行40个月,催化剂性能良好,满足生产要求。

βand MCM-49 zeolites were produced by 8 m3 high pressure reactor to further produceβ/MCM-49 zeolite transalkylation catalyst.And the effect of its structure and acidity on the transalkylation reaction was investigated.The structure and acidity of the catalyst were tested by X-ray diffraction(XRD),NH3-temperature programmed desorption(NH3-TPD)etc.At the same time,the study on the laboratory activity evaluation and the stability of industrial application in the cumene transalkylation unit of a 120,000 ton/year phenol-acetone production plant were carried out.The results show that the catalyst has the structural characteristics both ofβand MCM-49 zeolites.And it has suitable strong acid and weak acid content.The catalytic conversion of polycumene was high,and the content of product n-propylbenzene was low.The catalysts were used in the synthesis of cumene transalkylation unit in a phenol and acetone industrial production facility under the conditions of 185-196℃,polycumene(dicumene+tricumene)WHSV 0.5-0.9 h^(-1).After 40 months of operation,the catalysts showed good catalytic performance,and it met the production requirements of equipment.