Clean production method of p-anisidine
A technology of p-aminoanisole and p-nitroanisole, which is applied in the field of clean production of p-aminoanisole, can solve the problems of increased methanol distillation volume, increased energy consumption, and high energy consumption, and achieves simple operation, Reduce high salt and high COD wastewater, high yield and high purity effect
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[0021] Example 1
[0022] Add 204.4g of p-nitrochlorobenzene and 200g of methanol into a 1000mL autoclave, seal the autoclave, slowly heat up until the p-nitrochlorophenyl is dissolved, turn on the stirring and continue to heat up to 80°C, and then start to hydrate 460mL Sodium methanol solution (the content of sodium hydroxide is 125g / L) was added to the p-nitrochlorobenzyl alcohol solution in batches for contact reaction. Finally, the temperature is continued to increase to 100-105° C. and the reaction is kept warm, and the end of the reaction is reached in about 6 hours, wherein the purity of p-nitroanisole is 97.2%.
[0023] Then the reaction product is filtered to obtain a p-nitroanisole solution and a filter cake. The filter cake is washed with methanol and dried to obtain sodium chloride, the content of which is ≥99%, which meets the industrial product standard. The obtained p-nitroanisole solution was distilled to distill out about 300g of methanol, then the materials wer...
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[0025] Example 2
[0026] Add 204.4g of p-nitrochlorobenzene and 200g of methanol to a 1000mL autoclave, seal the autoclave, slowly heat up until the p-nitrochlorophenyl is dissolved, turn on the stirring and continue to heat up to 80°C, and then start to hydrate 460mL Sodium methanol solution (the content of sodium hydroxide is 125g / L) was added in batches to the p-nitrochlorobenzyl alcohol solution for contact reaction. Finally, the temperature is continued to increase to 100-105°C and the reaction is kept warm, and the end of the reaction is reached in about 6 hours, wherein the purity of p-nitroanisole is 97.5%.
[0027] Then the reaction product is filtered to obtain a p-nitroanisole solution and a filter cake. The filter cake is washed with methanol and dried to obtain sodium chloride, the content of which is ≥99%, which meets the industrial product standard. The obtained p-nitroanisole solution was distilled to distill out about 400g of methanol, and then the materials wer...
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