Study On Process And Kinetics Of Ethyl Nitrite Regeneration

The bubble column reactor and gas phase tubular reactor were used for the regeneration process of ethyl nitrite. The equipment was set up for measuring the kinetics of ethyl nitrite regeneration and the kinetic equation for gas-liquid reaction was obtained which can provide foundation and design reference for scale-up.The impact of process condition such as temperature, pressure, ethanol/NO mole ratio, NO/O2 mole ratio, ethanol concentration and the residence time were investigated. The optimum operating conditions for both reactors were determined to be as follows:(1) Bubble column reactor: the reaction temperature is 306~310K, the ethanol concentration is 50~95%, the mole ratio of NO to O2 is 5:1~6:1, pressure is 2~2.5 atm.(2) Gas phase tubular reactor: the reaction temperature is 343K, the mole ratio of C2H5OH to NO is 1.0~1.5, the mole ratio of NO to O2 is 5:1~6:1, pressure is 2~2.5 atm.The experiment results showed that both the bubble column reactor and the gas phase reactor were suitable for the regeneration reaction and the results of former were better than the latter. On the premise of high EN yield, ethanol consumption of the gas phase reactor was more close to the stoichiometric ratio. The kinetic model of ethyl nitrite regeneration on gas-liquid reaction was established as follows: R=kPNO1.2PO20.46 k=1.08823×10-5EXP(-1395.54/T)The activation energy is 11.6025kJ/mol and the pre-exponential factor is 1.08823×10-5.