Safe production method of nitro-compound
The technology of a nitro compound and a production method is applied in the field of production devices for preparing nitro compounds by nitration reaction, can solve problems such as unevenness, increased side reactions, limited production capacity, etc., achieves sufficient and uniform contact, reduced danger, The effect of short contact time
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Embodiment 1
[0033] Embodiment 1 prepares the method for nitrobenzene
[0034] Specific steps include:
[0035] 1) Using the HL-50 centrifugal extractor developed by Beijing Institute of Extraction Applied Technology as the nitration reaction separator, connect four separators in series according to the method described in the above-mentioned specific embodiment, so that water: nitric acid: sulfuric acid = 7:45 : The mixed acid solution prepared in the weight ratio of 48 is fed from the heavy phase inlet of the first nitration reaction separator, and benzene is fed from the light phase inlet of the fourth nitration reaction separator, and the mixed acid solution and benzene are continuously sent simultaneously by the metering pump. into the nitration reaction separator, wherein the feed molar ratio of benzene and nitric acid is 1:1.02, and the mixed acid and benzene carry out nitration reaction at a temperature of 60-80°C and a speed of 1100-1300 rpm; 2) each nitration In the reaction sep...
Embodiment 2
[0038] Embodiment 2 prepares the method for nitrobenzene
[0039] The process is the same as in Example 1, changing the mixed acid to form water: nitric acid: sulfuric acid=30:4:66, the feed molar ratio of benzene and nitric acid is 1.1:1.0, the temperature of mixed acid and benzene at 136°C and 900 rpm The nitrification reaction is carried out under the rotating speed;
[0040] The purity of the nitrobenzene product obtained in this embodiment is 99.5%, and the yield is 99.1%.
Embodiment 3
[0041] Embodiment 3 prepares the method for o-nitrotoluene
[0042] The process is the same as in Example 1, the mixed acid ratio is changed to water: nitric acid: sulfuric acid=20:56:24, the feed molar ratio of benzene to nitric acid is 1.0:1.05, the mixed acid and toluene are mixed at a temperature of 50°C and 1000 rpm The nitration reaction is carried out at a high speed; after the reaction is completed, the crude nitrates are rectified to obtain o-nitrotoluene, p-nitrotoluene and m-nitrotoluene.
[0043] The purity of the nitrotoluene product obtained in this embodiment is 98%, and the total yield is 94.5%.
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