Toluene is continually fed from the top of the oxidation tower at a price of 46000kg/h, cobalt benzoate at a rate of 14kg/h, and water at a price of 112kg/h. Air is constantly fed from all-time low of the oxidation tower at a price of 11500Nm3/h. Toluene and air are continually fed at the stimulant It responds constantly under the activity to create exhaust gas and oxidation fluid. Among them, the reaction temperature is 145 ° C, the reaction pressure is 700kPa, and the ordinary residence time is 5 hours.
After multi-stage condensation and multi-stage adsorption, the tail gas gets to the standard and is discharged. The majority of the above-mentioned oxidation fluid is sent out to the steam generator by a flowing pump to exchange warm with water to obtain heavy steam and heat-exchanged oxidation liquid. The heat-exchanged oxidation liquid is gone back to the oxidation Tower continues to respond.
A tiny part of the above-mentioned oxidation fluid constantly enters the middle part of the toluene flash dissipation tower for flash evaporation, and acquires the toluene flash evaporation tower leading product and the toluene flash dissipation tower bottom product. Among them, the outright pressure at the top of the toluene flash dissipation tower is 108kpa, and the top temperature is 115 ° C. In the oxidation liquid going into the toluene flash evaporation tower, the benzoic acid material is 15% and the benzaldehyde web content is 3%.
The leading material of the toluene flash dissipation tower is gone back to the oxidation tower to continue the response, and the bottom product of the toluene flash dissipation tower goes into the center part of the dehigh boiling tower for rectification to get the top material of the dehigh boiling tower and the bottom product of the dehigh boiling tower. Among them, the absolute pressure at the top of the high boiling tower is 20kPa, and the temperature level on top is 135 ° C
. The leading material of the high boiling removal tower goes into the center part of the benzaldehyde light elimination tower for correction to acquire the leading material of the benzaldehyde light removal tower and the bottom product of the benzaldehyde light removal tower. Amongst them, the outright stress at the top of the Benzaldehyde Oil lightening tower is 30kPa, and the top temperature is 78 ° C
. The leading product of the Benzaldehyde Oil light elimination tower is returned to the oxidation tower to continue the reaction, and the bottom product of the benzaldehyde light removal tower goes into the center part of the benzaldehyde rectification tower for correction to get 1200kg/h benzaldehyde completed item and the bottom material of the benzaldehyde rectification tower. Amongst them, the outright stress on top of the benzaldehyde purification tower is 30kPa, and the top temperature is 133.2 ° C.
The bottom product of the Benzaldehyde Oil purification tower is gone back to the oxidation tower to proceed the response. The pureness of the benzaldehyde product is 99.92%.