Method for preparing methyl nitrite through catalyzing dilute nitric acid
A technology for the production of methyl nitrite and nitric acid, which is applied in the field of chemical industry and can solve the problem of large catalyst consumption
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Embodiment 1
[0018] Add 1% nitric acid 300g in batch reactor, add 20 purpose catalyst C 3 N 4 0.5g, heated to 70°C, heated and vaporized 15g of methanol, passed it into the nitric acid solution through the bottom tube, stirred vigorously for 4 hours, analyzed the content of nitric acid and nitrous acid in the effluent by ionic liquid chromatography, and calculated the content of nitric acid Conversion and selectivity to nitrous acid. The conversion rate of nitric acid reaches 95%, and the selectivity of methyl nitrite reaches 81%.
Embodiment 2~5
[0019] Embodiment 2~5: repeat the reaction process of embodiment 1, difference is that reaction condition and catalyst are different. The specific reaction conditions and results of each embodiment are listed in Table 1.
[0020] Table 1, embodiment 2~5 specific reaction conditions
[0021]
Embodiment 6
[0023] Such as figure 1 The particle size shown is 15 mesh 5g C 3 N 4 The catalyst is loaded into a glass tube reactor with a diameter of 15mm, and the reaction temperature is 70°C. Add 1wt% dilute nitric acid reaction solution from the top with a metering pump, and methanol gas is introduced from the bottom of the reactor, and the WHSV is 1.0h -1 , Reduction and esterification reactions are carried out under normal pressure. The conversion rate of nitric acid reaches 95%, and the selectivity of methyl nitrite reaches 81%.
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