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以钨酸钠为催化剂、过碳酸钠为氧化剂,选择性氧化乙腈制备乙酰胺。研究了该碱性氧化体系的作用,比较了反应时间、温度对反应的影响。考察了钨酸钠的催化性能以及不同碳酸钠用量在体系中的反应结果。反应时间的延长和温度的升高并不利于提高转化率,因此反应选择在室温条件下进行。碳酸钠和氧化体系碱性的增加能促进产物乙酰胺的生成。以钨酸钠为催化剂,反应条件:室温25℃,时间4h,V[H2O]/V[methanol]=2/3时,乙腈的转化率可达100%左右,生成的乙酰胺的选择性可达94.3%。
Sodium tungstate as catalyst, sodium percarbonate as oxidant, selective oxidation of acetonitrile to prepare acetamide. The effect of the basic oxidation system was studied. The effects of reaction time and temperature on the reaction were compared. The catalytic performance of sodium tungstate and the reaction results of different sodium carbonate dosage in the system were investigated. The extension of the reaction time and the increase of the temperature are not conducive to increasing the conversion rate, so the reaction is carried out at room temperature. The basicity of sodium carbonate and oxidation system can promote the formation of acetamide. Using sodium tungstate as catalyst, the conversion of acetonitrile can reach about 100% when the reaction conditions are: room temperature 25 ℃, time 4h, V [H2O] / V [methanol] = 2/3. Up to 94.3%.