合成2,6-二甲基苯胺的催化剂及工艺条件研究  

Study on Catalyst and Process of Synthesizing 2,6-Dimethylaniline

作　　者：陈立宇[1] 张秀成[1] 董武[1] 陈虎魁[2] 

机构地区：[1]西北大学化工系,陕西西安710069 [2]宝鸡文理学院化工系,陕西宝鸡721007

出　　处：《精细化工》2000年第1期19-22,共4页Fine Chemicals

基　　金：陕西省教委重点科研基金!97JZK08

摘　　要：通过实验筛选出该反应的催化剂为Ｖ２Ｏ５ － Ｃｒ２Ｏ３ － Ａｌ２Ｏ３ ，确定了浸渍法制备的浸渍液质量分数为１３－２％ ，催化剂中主催化剂Ｖ２Ｏ５ 的最佳质量分数为１０ ％ ，最佳改性金属氧化物为Ｃｒ２Ｏ３及最适宜比例为ｎ（Ｖ２Ｏ５）∶ｎ（Ｃｒ２Ｏ３） ＝１０∶１ 。通过工艺条件考察，筛选出最佳工艺条件为：反应温度３７０ ℃，原料配比ｎ（Ｃ７Ｈ７ＮＨ２）∶ｎ（ＣＨ３ＯＨ）∶ｎ（Ｈ２Ｏ）＝ １∶３∶１，液时空速０－５／ｈ，原料中加入水可明显提高目的产物选择性。反应转化率为７４－２９ ％ ，目的产物选择性为５１－２４ ％ 。The process of synthesizing 2,6 dimethylaniline with o toluidine and methanol by vapor solid phase alkylation was studied.The optimum catalyst V 2O 5-Cr 2O 3-Al 2O 3 was selected and the effect of process conditions on this reaction was also discussed. The main catalyst V 2O 5 in this reaction was selected and the optimum concentration was 10%.The preparation method of bi impregnation with mono roasting was established and the concentration of impregnating solution should be ≤ 13 2%.The effect of modifying metallic oxide was evaluated. Cr 2O 3 was chosen as the best modifier and the optimum ratio was n(V 2O 5)∶n(Cr 2O 3)=10∶1.The optimum process conditions selected were as follows: reaction temperature 370℃,n(C 7H 7NH 2)∶n(CH 3OH)∶n(H 2O)=1∶3∶1 and liquid hourly space velocity 0.5/h. The selectively of this reaction was improved distinctly by adding water into the feed. The conversion of o toluidine was 74 29%,selectivity for 2,6 dimethylaniline was 51 24 %.

关 键 词：二甲基苯胺 气固相 烷基化 催化剂 工艺条件 

分 类 号：TQ426.94[化学工程] TQ246.31