摘要
采用催化精馏装置,以γ-Al2O3为催化剂,考察了反应操作条件对苯胺(AN)、尿素和甲醇合成苯氨基甲酸甲酯(MPC)反应的影响,并考察了γ-Al2O3催化剂的活性稳定性。结果表明,MPC合成反应的适宜的操作条件为反应温度180℃,反应压力0.80~0.85 MPa,回流比0.50,反应原料分为2股进料,其中,苯胺、尿素和甲醇的混合液以n(AN)∶n(Urea)∶n(Methanol)=1∶5∶75的比例在反应段上方进料,进料速率0.3 mL/min,另一部分纯甲醇在反应段下方进料,进料速率5.0 mL/min。在此条件下,苯胺转化率为99.0%,MPC收率和选择性分别为69.5%和70.2%,γ-Al2O3催化剂连续运行408 h后,其催化活性几乎没有变化。
The effect of operation conditions on the synthesis of methyl N-phenyl carbamate (MPC) from aniline (AN), urea and methanol was studied in a catalytic distillation unit with y-Al2O3 as catalyst, and the stability of y-Al2O3 catalyst was investigated. Under the suitable operation conditions of reaction temperature 180℃, reaction pressure 0.80-0.85 MPa, reflux ratio of 0.50, one mixture feed stream of n(AN)∶n(Urea)∶n(Methanol)=1∶5∶75 with feed rate of 0.3 mL/min into the reaction zone at the upper section, another feed stream of methanol with feed rate of 5 mL/min into the reaction zone at the lower section, the conversion of aniline, MPC yield and selectivity were 99.0%, 69.5%, and 70.2%, respectively. In addition, y-Al2O3 still maintained the catalytic activity as the fresh one after continuous operation for 408 h in the catalytic distillation unit, indicating that it had a satisfactory stability in the synthesis of MPC.
出处
《石油学报(石油加工)》
EI
CAS
CSCD
北大核心
2013年第6期996-1002,共7页
Acta Petrolei Sinica(Petroleum Processing Section)
基金
国家自然科学基金项目(20976035)
河北省自然科学基金项目(B2010000019)
天津市自然科学基金项目(12JCYBJC12800)
河北省应用基础研究计划重点基础研究项目(12965642D)资助