Synthetic method of 2-cyanogroup-4-nitro-6-bromaniline diazosalt
A synthesis method and technology for p-nitroaniline are applied in chemical instruments and methods, preparation of organic compounds, organic chemistry, etc., and can solve problems such as insufficient operation, large floor space, complicated processes, etc., and achieve shortening of production processes, The effect of less three wastes and simple process
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[0019] Example 1
[0020] Add 200 g of sulfuric acid with a mass percentage of 60% into the flask, add 32.6 g of p-nitroaniline with zirconium cyanide under stirring, and heat up to 50° C. to maintain. The dropwise addition of 18.2 g of bromine was started, and the reaction temperature was 20-25°C. After holding, 13.1 g of 30% hydrogen peroxide was added dropwise, and the dropwise temperature was controlled at 20-25°C. End-point sampling analysis, the main content is 97.52%, and the raw material is 0.77%;
[0021] 70 g of 40% nitrosyl sulfuric acid was added dropwise at a temperature of 10-15° C. for diazotization, and kept for 3.0 hours after the dropwise addition. The diazonium salt is coupled by conventional methods to obtain Disperse Blue 183:1 dye. 86.3 g of dry dye was obtained, with excellent dye performance and 92.8% dye chromatographic content.
Example Embodiment
[0022] Example 2
[0023] 500 g of sulfuric acid with a mass percentage of 30% was added to the flask, and 32.6 g of pyrimethacrylate-p-nitroaniline was added under stirring, and the temperature was raised to 40°C. Then 23.7g of sodium bromide was added, and the temperature of the addition was controlled at 40°C. After holding, 13.5 g of hydrogen peroxide was added dropwise, and the dropwise temperature was controlled at 45-50°C. Sampling and analysis after the end point, the main content is 97.2%, and the raw material is 0.4%;
[0024] At this temperature, 72 g of 40% nitrosyl sulfuric acid was added dropwise for diazotization, and the solution was kept for 3.0 hours after the dropwise addition. The diazonium salt is coupled by conventional methods to obtain Disperse Blue 183:1 dye. 87.0g of dry dye products were obtained. Dye performance is excellent. Dye chromatographic content 92.6%.
Example Embodiment
[0025] Example 3
[0026] 400 g of sulfuric acid with a mass percentage of 40% was added to the flask, and 32.6 g of bis-cyano-p-nitroaniline was added under stirring, and the temperature was raised to 30°C. Then 23.7g of sodium bromide was added, and the temperature of the addition was controlled at 30°C. After holding, 17 g of chlorine gas was introduced, and the temperature was controlled at 30 °C. Sampling and analysis after the end point, the main content is 97.5%, and the raw material is 0.5%;
[0027] At this temperature, 72 g of 40% nitrosyl sulfuric acid was added dropwise for diazotization, and the solution was kept for 3.0 hours after the dropwise addition. The diazonium salt is coupled by conventional methods to obtain Disperse Blue 183:1 dye. 86.5g of dry dye was obtained, with excellent dye performance. Dye chromatographic content 91.76%.
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