Environment-friendly production method of benzaldehyde
A production method and technology of benzaldehyde, applied in chemical instruments and methods, preparation of organic compounds, organic chemistry, etc., can solve the problems of high environmental damage, poor ortho-para selectivity, and low-purity products.
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Embodiment 1
[0019] S1: Add copper nitrate, water, silver nitrate and catalyst potassium permanganate to the reaction device, raise the temperature to 70°C, add benzaldehyde dropwise, the dropwise addition time is 2 hours, continue to heat up to 95°C, and keep warm for 2 reactions Hour, obtain reaction mixture, wherein the mol ratio of copper nitrate, water, silver nitrate, catalyzer potassium permanganate and benzaldehyde is 5:40:1:0.2:1; Sampling is carried out chromatographic detection from reaction mixture, and benzaldehyde The content is less than 0.5%;
[0020] S2: Filter the reaction mixture to remove the copper hydroxide precipitate to obtain the mother liquor, cool the mother liquor to 20°C, and filter the solid to obtain the crude m-nitrobenzaldehyde, the content of o-nitrobenzaldehyde in the crude m-nitrobenzaldehyde less than 0.5%;
[0021] S3: Put the m-nitrobenzaldehyde crude product into the reaction device, add a water-soluble solvent methanol that is 3.0 times the volume ...
Embodiment 2
[0023] S1: Add copper nitrate, water, silver nitrate and catalyst potassium permanganate to the reaction device, raise the temperature to 80°C, add benzaldehyde dropwise, the dropwise addition time is 3 hours, continue to heat up to 85°C, keep warm for 2.5 reactions Hour, obtain reaction mixture, wherein the mol ratio of copper nitrate, water, silver nitrate, catalyzer potassium permanganate and benzaldehyde is 5:40:1:0.2:1; Sampling is carried out chromatographic detection from reaction mixture, and benzaldehyde The content is less than 0.5%;
[0024] S2: Filter the reaction mixture to remove the copper hydroxide precipitate to obtain the mother liquor, cool the mother liquor to 10°C, and filter the solid to obtain the crude m-nitrobenzaldehyde, the content of o-nitrobenzaldehyde in the crude m-nitrobenzaldehyde less than 0.5%;
[0025] S3: Put the crude product of m-nitrobenzaldehyde into the reaction device, add ethanol, a water-soluble solvent 3.5 times the volume of the ...
Embodiment 3
[0027] S1: Add copper nitrate, water, silver nitrate and catalyst potassium permanganate to the reaction device, raise the temperature to 75°C, add benzaldehyde dropwise, the dropwise addition time is 3 hours, continue to heat up to 87°C, and keep warm for 2.5 reactions Hour, obtain reaction mixture, wherein the mol ratio of copper nitrate, water, silver nitrate, catalyzer potassium permanganate and benzaldehyde is 5:40:1:0.2:1; Sampling is carried out chromatographic detection from reaction mixture, and benzaldehyde The content is less than 0.5%;
[0028] S2: Filter the reaction mixture to remove the copper hydroxide precipitate to obtain the mother liquor, cool the mother liquor to 15°C, and filter the solid to obtain the crude m-nitrobenzaldehyde, the content of o-nitrobenzaldehyde in the crude m-nitrobenzaldehyde less than 0.5%;
[0029] S3: Put the crude m-nitrobenzaldehyde into the reaction device, add isopropanol, a water-soluble solvent 3.2 times the volume of the cru...
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