小型热虹吸环流反应器中丙烯环氧化工艺条件

引　言钛硅催化剂 (ＴＳ - 1)上的丙烯与Ｈ2 Ｏ2 环氧化过程是环氧丙烷 (ＰＯ)洁净生产的发展方向[1,2 ] ,但对于环氧化反应器的研究尚很不完备 .该反应是一个强放热的气液固三相反应 ,要实现该反应过程的连续化 ,可以采用搅拌釜式反应器或固定床反应器(滴流床反应器 ) .搅拌釜式反应器主要用于催化剂性能评价 ,由于搅拌釜内物料返混严重 ,反应器体积效率较低 ;固定床反应器是由美国ＡＲＣＯ公司的Ｊｕｂｉｎ[3] 等发明的 ,实际上为多段气液呈并流向下的滴流床反应器 ,该反应器结构复杂 ,操作压力较大 (在 1.2 5ＭＰａ以上 ) ,且为了便于控…

EPOXIDATION OF PROPYLENE IN SMALL-SCALE THREE-PHASE LOOP THERMOSYPHONIC REACTOR

The influences of temperature, pressure, catalyst content, H 2O 2 content and mol ratio of propylene to H 2O 2 on epoxidation of propylene with H 2O 2 over TS-1 in a small-scale three phase loop thermosphonic reactor were investigated. The proper reaction condition was determined as follows: mol ratio of propylene to H 2O 2 was 1.1—1.3, temperature was 30—45?℃, reaction temperature rise was below 15?℃, pressure was 0—0.1?MPa, catalyst content was 3%—6%,and H 2O 2 content was 3%—5%.The conversion of H 2O 2 is above 94%,and selectivity of propylene is up to 96%. At these conditions, the yield of PO is higher than a figure of about 80%,which is achieved using conventional reactor. This reactor can realize catalyst regeneration continuously. This viable reactor can also be applied in other oxidation processes using TS-1, i.e. hydroxylation of phenol, ammoxidation of cyclohexanone.The results will lay a foundation for the development of the reactor in propylene epoxidation process.