摘要
选用丙酸为溶剂,二氯化钴、硫酸锰、溴化钾为复合催化剂,以对硝基甲苯为原料,在中压反应釜中,用空气液相氧化法制备对硝基苯甲酸。考察了实验的温度、压力、时间、配比、空气流量等对产品收率影响。结果表明:当反应温度为170℃,压力为0.7 MPa,原料配比m(对硝基甲苯)/m(丙酸)/m(催化剂)=50∶200∶3以及空气流量为2.7 L/min时,反应6 h,产品收率达到72.5%。
Using propionic acid as the solvent, cobalt dichloride, manganous sulfate and potassium bromide as compound catalyst, p-nitrobenzoic acid was synthesized by air liquid phase oxidation method in a middle-pressure reactor. Effects of temperature,pressure,time,raw material ratio and air flow on the product yield were investigated. The results show that ,when the reaction temperature is 170 ℃, pressure is 0.7 MPa, reaction time is 6 h,raw material ratio （p-nitrotoluene∶propionic acid∶catalyst ） is 50∶200∶3 and the air flow is 2.7 L/min, the product yield can reach 72.5%.
出处
《当代化工》
CAS
2013年第11期1516-1518,1531,共4页
Contemporary Chemical Industry
