以NiSO_4／γ－Al_2O_3为催化剂丙烯齐聚两段反应法制壬烯和十二烯新工

A New Technology of Nonene and Dodecene Production──Two-Stage Reaction Temperature Method of Propene Oligomerization over NiSO_4/γ-Al_2O_3

研究了以ＮｉＳＯ＿４／γ－Ａｌ＿２Ｏ＿３为催化剂丙烯齐聚两段反应法制壬烯和十二烯的新工艺。考察了反应温度、空速及溶剂稀释等工艺条件的影响及在第二个反应器前添加丙烯的效果。当两段串联反应器的第一段和第二段的反应温度分别为６０℃和８０℃，反应压力为３．２ＭＰａ，丙烯的液体体积空速（ＬＨＳＶ）为１．５ｈ￣（－１）时，丙烯转化率达９６．５％，壬烯和十二烯的选择性分别为２７．９％（ｗ）和２９．６％（ｗ）。若按二聚物返回反应体系计，目的产物总选择性达８０％。

A new technology of producing nonene and dodecene by a two-stage reaction temperaturemethod of propene oligomerization over NiSO_4/γ-Al_2O_3 has been developed.Its characteristicsare high propene conversion, high nonene and dodecene selectivity and alteration of productdistribution by changing the space velocity and the reaction temperature of the two reactors.The propene conversion reaches 96.5%and the selectivity of nonene and dodecene is 27.9%(w)and 29.7%(w) respectively under the conditions of LHSV 1.5h￣(-1) and reaction temper-ature 60℃ and 80℃ fOr the first and the second reactor respectively.It was supposed thatif the dimer was fed back to the system,the total selectivity of nonene and dodecene couldreach 80%(w).Adding new propene to the entrance of the second reactor does not increasethe selectivity of nonene and dodecene as expected.