摘要
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%。
The oxidation reaction of aeetonitrile using Na2WO4·2 H2O as ealalyst and sodium peroxide carbonate as oxidant was studied. The effect of the alkaleseenee oxidation system, as well as the catalytic performance of sodium tungsten and dosage of sodium carbonate were investigated. The reaction time and temperature were compared. The conversions of substrate do not always increased with the increase of reaction time or reaction temperature, so the reaction was chosen to carry through room temperature. The increase of the quantity of sodium carbonate or the alkaleseenee of reaction system would lead to formation of more acetamide. When Na2WO4·2 H2O was used as catalyst, under the optimum reaction conditions： T=25℃, t=4h, V[H2O]/V[methanol]=2/3, the conversion of aeetonitrile was 100% the selectivty form aeetamide was 94.3%.
出处
《河北化工》
2008年第8期7-8,39,共3页
Hebei Chemical Industry
关键词
乙腈
钨酸钠
乙酰胺
催化氧化
acetonitile： sodium tungtate
acetamide
catalytic oxidation
