多级固定床反应器串联的环氧乙烷催化水合制乙二醇工艺的研究

以HCO3-型强碱性阴离子交换树脂为催化剂,采用多级固定床反应器串联的催化水合工艺(简称多级工艺)对环氧乙烷(EO)制乙二醇(EG)的反应进行了研究,并与采用单个固定床反应器的单段工艺进行了对比,考察了水与EO的摩尔比(简称水比)和重时空速对多级工艺中EO转化率和EG选择性的影响。实验结果表明,与单段工艺相比,多级工艺采用多段进料的方式,有效移除反应中放出的热量,降低了催化剂的膨胀率,提高了催化剂的使用寿命;在3个反应器温度分别为77,75,70℃、水比为8、重时空速为2.0h-1、压力为1.0MPa的条件下,连续运行2880h,EO转化率约为99%,EG选择性约为97%。

Preparation of Ethylene Glycol by Catalytic Hydration of Ethylene Oxide in Multistage Fixed Bed Reactor

Catalytic hydration of ethylene oxide(EO)to produce ethylene glycol(EG)on a HCO-3 type strong base anion-exchange resin catalyst S201 was studied in a multistage fixed bed reactor.The process was named as multistage process.The multistage process was compared with the process in a single fixed bed reactor named as single stage process.Effects of initial mole ratio of water to EO and WHSV on EO conversion and EG selectivity were investigated in the multistage process with separate multistage feedings which could transfer the released reaction heat effectively,reduce the resin expansion rate and prolong the catalyst operating life greatly.When reaction temperatures of three consecutive reactors were 77,75,70 ℃ successively,pressure 1.0 MPa,initial mole ratio of water to EO 8,WHSV 2.0 h-1,EO conversion and EG selectivity could reach about 99% and 97% respectively in a running time of 2 880 h on the catalyst.