A kind of preparation method of diphenyl ether
A technology of diphenyl ether and phenol, which is applied in the field of preparation of diphenyl ether, can solve problems such as complex procedures and long reaction time, and achieve the effect of filling the gap in China, low cost and few reaction steps
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Embodiment 1
[0019]
[0020] Open the nitrogen purging pipeline and the fixed-bed reactor to replace the air therein. The raw material phenol is preheated to 100° C., and then pumped into the fixed-bed reactor. Magnesium oxide (68% by mass) is housed in the fixed-bed reactor. %) / 4A zeolite (mass percentage 32%) catalyst, heat the fixed bed reactor to 400°C, the pressure inside the reactor is 0.1MPa, adjust the nitrogen flow rate so that the residence time of the material in the fixed bed reactor is 15 seconds, The diphenyl ether, water and unreacted raw material phenol produced by the reaction leave the fixed-bed reactor in a gaseous state, enter the multi-stage condenser to cool into liquid, and then enter the rectification tank for rectification separation, and the collected water is used as circulating water supplement , Phenol re-enters the reaction system for recycling, the finished product enters the finished product tank, and the finished product is analyzed by gas chromatography ...
Embodiment 2
[0022]
[0023] Open the nitrogen purging pipeline and the fixed-bed reactor to replace the air therein. The raw material phenol is preheated to 120° C., and then pumped into the fixed-bed reactor. Magnesium oxide (60% by mass) is housed in the fixed-bed reactor. %) / 4A zeolite (40% by mass) catalyst, the fixed bed reactor was heated to 500°C, the pressure inside the reactor was 0.2MPa, and the nitrogen flow rate was adjusted so that the residence time of the material in the fixed bed reactor was 5 seconds. The diphenyl ether, water and unreacted raw material phenol produced by the reaction leave the fixed-bed reactor in a gaseous state, enter the multi-stage condenser to cool into liquid, and then enter the rectification tank for rectification separation, and the collected water is used as circulating water supplement , Phenol re-enters the reaction system for recycling, the finished product enters the finished product tank, and the finished product is analyzed by gas chroma...
Embodiment 3
[0025]
[0026] Open the nitrogen purging pipeline and the fixed-bed reactor to replace the air therein. The raw material phenol is preheated to 80° C., and then pumped into the fixed-bed reactor. Magnesium oxide (77% by mass) is housed in the fixed-bed reactor. %) / 4A zeolite (mass percentage 23%) catalyst, heat the fixed bed reactor to 300 °C, the pressure inside the reactor is 0.05MPa, adjust the nitrogen flow rate so that the residence time of the material in the fixed bed reactor is 30 seconds, The diphenyl ether, water and unreacted raw material phenol produced by the reaction leave the fixed-bed reactor in a gaseous state, enter the multi-stage condenser to cool into liquid, and then enter the rectification tank for rectification separation, and the collected water is used as circulating water supplement , Phenol re-enters the reaction system for recycling, the finished product enters the finished product tank, and the finished product is analyzed by gas chromatography...
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