Study On The New Catalyst Of Synthesis Of 2-Methylpyrazine

In this paper, the synthetic routes of 2-methylpyrazine and the system of solid catalyst, which was used in preparing 2- methylpyrazine from propylene glycol and ethylenediamine, were reviewed. A new bifunctional catalyst system was put forward, which have dehydration and dehydrogenation, and was composed of ZnO and CuO, as main catalyst, and A12O3, assistant catalyst.The reaction conditions have been investigated systematically, such as the amount of water in raw material, the reaction of temperature, the kind and flow of carrier gas, the treatment technics of catalyst before used, the flow rate of raw material. And the condition was optimized. As SP-1 catalyzed at 380 ℃, which have been calcined at 360℃ and been reduced by hydrogen and nitrogen, when the mol ratio of PG, EDA, H2O and N2 was 1:1:5:2, and LHSV was 1.0 h-1 and VHSV was 924 h-1, the conversion ratio of the reaction was 93.2%, and the yield of 2- methylpyrazine was 90.2%.The method of preparation of catalyst, compound ratio of activator and catalysis of charcoal active were studied. Good results were got when the mass ratio of CuO, ZnO and Al2O3 was 45.5: 46.0: 8.5. Among the precipitating agent which was used to prepare catalysts, ammonia was the best. The reaction conversion of reaction was 93.8% and yield 86.3% when used the catalyst which prepared by coprecipitation with ammonia. If the charcoal was used as catalyst, 2- methylpyrazine also could be get. But when charcoal was impregnated with active components, property of the catalyst was improved observably.The life-span and regeneration of catalyst were studied. At 380℃, life-span of SP-1 was examined with raw material which have water and no water respectively, and the result was preferable. Catalyst could be regenerated by calcined at high temperature. The mechanism of reaction and separation of product were also researched.