Refining and reclaiming technology of tail gas absorption solvent in production of toluene diisocyanate
A technology for toluene diisocyanate and tail gas absorption, which is applied in the purification/separation of isocyanic acid derivatives, purification/separation of hydrocarbons, separation methods, etc. Adverse effects and other issues, to achieve the effect of reducing operating costs and equipment costs, avoiding operating costs and maintenance costs, and reducing operating and maintenance costs
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[0028] The solvent used in this embodiment is toluene, but not limited to toluene. The atmospheric pressure where the TDI device is located is 0.84 bar.
[0029] 1. The flow rate of logistics S1 is 2992kg / h, which contains phosgene 4.6kg / h, TDI10.2kg / h, DEIP4.2kg / h, the rest is toluene and a small amount of other impurities, and the feed temperature is 160°C (determined by the previous process) , continuously and stably fed from the middle of the atmospheric refining tower 1, the gas phase at the top of the tower is condensed in the condenser 2, the condensation temperature is 40-60°C, the condensate enters the reflux tank 3, overflows back to the top of the tower, and serves as the reflux of the tower, reflux Part of the material S2 is regularly discharged from the bottom of the tank 3, neutralized with caustic soda solution and then incinerated to avoid the accumulation of light components other than phosgene such as water and carbon tetrachloride in the system; the unconden...
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