Utilizing process of nitrobenzene distilation redsdue
A distillation residue and nitrobenzene technology, which is applied in the field of utilization of nitrobenzene distillation residue, can solve the problems of difficult waste acid treatment, high equipment cost, and long production cycle, and achieve good environmental benefits, low production costs, and high product quality. Good results
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Embodiment 1
[0013] Embodiment 1: In the four-necked bottle that electric stirrer, reflux condenser, thermometer and dropping funnel are installed at room temperature, add ethyl acetate 200ml, water 100ml, start stirrer, add 110g nitrobenzene distillation after stirring The remaining residue, 6g of powdery activated carbon, was heated to 64-66°C, kept warm for 30 minutes, and when cooled to 30°C, suction filtered, and the spent activated carbon was discarded (or reused after treatment). Add the above-mentioned filtrate in the four-necked flask, start stirring and heat up, until the liquid phase temperature is 76°C and the gas phase temperature is 71°C, there will be distillate; at this time, open the dropping funnel valve and slowly add water (about 150ml) to the flask. Continue distilling until the liquid phase temperature is 92°C and the gas phase distillation temperature is 82°C, then stop the distillation and distill out 178ml of ethyl acetate; then let the material in the flask cool do...
Embodiment 2
[0014] Embodiment 2: In the four-neck flask that electric stirrer, reflux condenser, thermometer and dropping funnel are installed at room temperature, add ethyl acetate 200ml, water 150ml, start stirrer, add 120g nitrobenzene distillation after stirring The remaining residue and 6g of powdered activated carbon were heated up to 74-76°C, kept warm for 30 minutes, cooled to 25°C, and suction filtered. Put the filtrate into a four-necked flask, start stirring and heat up distillation, until the liquid phase temperature is 76°C and the gas phase temperature is 71°C, open the valve of the dropping funnel and slowly add about 100ml of water to the flask, continue distillation until the liquid phase temperature is 92°C, and the gas phase temperature is 71°C. The distillation was stopped when the distillation temperature was 82°C, and a total of 155ml of ethyl acetate was distilled out; then the material in the flask was naturally cooled down to 25°C, and suction filtered to obtain 89...
Embodiment 3
[0015] Embodiment 3: In the four-neck flask that electric stirrer, reflux condenser, thermometer and dropping funnel are installed at room temperature, add ethyl acetate 300ml, water 100ml, start stirrer, add 110g nitrobenzene distillation after stirring The remaining residue and 8g of powdery activated carbon were heated up to 54-56°C, kept warm for 30min, cooled to 25°C, and suction filtered. Put the filtrate into the four-necked flask, start stirring and heating up for distillation. When the liquid phase temperature is 76°C and the gas phase temperature is 71°C, open the valve of the dropping funnel and slowly add about 100ml of water to the flask, and continue to distill until the liquid phase temperature is 92°C. When the temperature reached 82°C, the distillation was stopped, and a total of 255ml of ethyl acetate was distilled out; then the material in the flask was naturally cooled down to 25°C, and filtered with suction to obtain 93.6g of yellow m-dinitrobenzene crude p...
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