Cu-Cr催化N,N-二甲基十二烷基酰胺加氢

Hydrogenation of N,N-Dimethyldodecylamide on Cu-Cr Catalyst

研究了N,N-二甲基十二烷基酰胺的催化加氢反应,通过将Cu-C r催化剂与传统的加氢催化剂(如Cu-N i,Pd/C,Raney N i)进行对比,对加氢催化剂进行了筛选,实验结果表明,Cu-C r催化剂在N,N-二甲基十二烷基酰胺的催化加氢反应中具有较高的活性,当n(Cu)∶n(C r)=1∶1、还原温度200℃时,Cu-C r催化剂的活性最高。考察了反应温度、反应压力以及通入二甲胺气体对反应的影响,实验结果表明,二甲胺气体的通入有利于抑制副反应的进行;在反应温度230℃、反应压力3.0M Pa、反应后期通入二甲胺气体的条件下,N,N-二甲基十二烷基酰胺的转化率达99.5%,产物中N,N-二甲基十二烷基叔胺的质量分数达到85.3%,N,N-双十二烷基甲基叔胺的质量分数达到9.5%。

Hydrogenation of N, N-dimethyldodecylamide for preparations of N, N-dimethyldodecyl tertiary amine and N, N-didodecylmethyl tertiary amine was studied on different catalysts, namely Cu- Cr,Cu-Ni, Pd/C and Raney Ni. The two amines can be used as surfactants, Cu-Cr was the best catalyst under optimized conditions：n（CU） ： n（Cr）1 ： 1 and reduction temperature 200 ℃. Effects of reaction temperature, reaction pressure and addition of dimethylamine on hydrogenation were investigated. Addition of dimethylamine could effectively prohibit formation of byproduct lauryl alcohol. Under optimal conditions： reaction temperature 230℃, reaction pressure 3. 0 MPa, and addition of dimethylamine at later stage of reaction, conversion of N,N-dimethyldodecylamide could reach 99.5 %, and mass fractions of N,N-dimethyldodecyl tertiary amine and N, N-didodecylmethyl tertiary amine in products could reach 85.3 % and 9.5 %, respectively.