| The gas phase tubular reactor and trickle-bed reactor were selected for the regeneration process of ethyl nitrite to replace the conventional bubbling tower reactor. The impact of process conditions such as gas intake mode, packing material, temperature, ethanol/NO molar ratio, NO/O2 molar ratio, N2 volume percentage of total gas feed and the retention time were investigated. The optimum operating conditions for both reactors were determined to be:(1) Gas phase alcohol feeding tubular reactor: the gas intake mode is the postmixing, packing material is non-packing orθ-ring packing, the reaction temperature is 70℃, the molar ratio of C2H5OH to NO is 1.5:1~2:1, the molar ratio of NO to O2 is 6:1~7:1 and the content of N2 is 10~30%.(2) Trickle-bed reactor: Gas intake mode is postmixing, packing material isθ-ring packing, reaction temperature is 50℃, the molar ratio of C2H5OH to NO is 1.5:1~2:1, the molar ratio of NO to O2 is 6:1~7:1 and the content of N2 is 50%. Methyl nitrite regeneration reaction was studied also. It was found that at the same reaction condition, the selectivity and yield of methyl nitrite was less than that of ethyl nitrite.The experiment result showed that both the gas phase reactor and the trickle-bed reactor were suitable for the regeneration reaction, and ethanol consumption of both reactors was reduced to be close to the stoichiometric ratio while the EN selectivity and space-time yield were kept at quite high level.
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