固定流化床反应器中Fe-ZSM-5分子筛上N2O一步氧化苯制苯酚再生工艺条件研究

 采用等温固定流化床反应器，对N2O一步氧化苯制苯酚所用Fe-ZSM-5分子筛催化剂的再生工艺条件进行了实验研究。在对固定流化床反应器性能研究的基础上，以单因素实验法考察了再生温度（350~550 ℃）、再生气中N2O体积分数（6.25%~25.00 ％）和再生操作气速（0.040~0.072 m/s）等对再生过程的影响；并采用L9（34）正交实验设计，综合考察了再生温度、再生气中N2O体积分数和再生操作气速对再生过程的影响。以苯酚收率最大为目标最终确定的相对适宜再生工艺条件为：再生温度440 ℃、再生气中N2O体积分数12.50 ％、再生操作气速0.059 m/s，在此条件下，苯酚的收率可达64.24％。

AN INVESTIGATION OF THE REGENERATION CONDITIONS OF BENZENE TO PHENOL BY ONE-STEP OXIDATION WITH NITROUS OXIDE OVER Fe-ZSM-5 ZEOLITE IN FIXED FLUIDIZED BED

The influence of regeneration conditions on the performance of Fe-ZSM-5 zeolite catalyst for benzene to phenol with nitrous oxide was studied systematically by a fixed fluidized bed (FFB) reactor. On the basis of FFB performance investigation, the effects of regeneration temperature (350~550 ℃), volume percentage of N2O in regeneration gas (6.25~25％) and regeneration gas velocity (0.040~0.072 m/s) on the catalytic performance of regenerated catalyst were studied by single-factor test method. Based on the above results, orthogonal design tests, L9(34), were carried out to determine the optimum conditions for obtaining maximum yield of phenol. Results showed that using catalyst regenerated under the optimum conditions of a regeneration temperature of 440 ℃, a volume percentage of N2O in regeneration gas of 12.50% and a regeneration gas velocity of 0.059 m/s, the yield of phenol could reach 64.24 %.