In the phenol recovery process of coal chemical device,due to the simultaneous presence of carbon dioxide and ammonia in the gas phase pipeline at the top of the deamination tower,when the operating temperature is below 60 ℃,it is easy to form ammonium bicarbonate crystals to block the pipeline,causing an increase in the pressure of the deamination tower and a decrease in the pressure of the ammonia purification tower,which affects the safe and stable operation of deacidification tower.When the pressure of the deacidification tower increases,it leads to a decrease in the pressure and temperature difference between the reboiler tube and shell of the deamination tower,and some of the ammonia in the tower cannot be effectively removed.The deamination water coming out of the bottom of the deamination tower contains a large amount of ammonia,which increases its pH value.After the pH value increases,the distribution coefficient of phenol decreases during the extraction process,and the phenol content in the dilute phenol water exceeds the standard.By increasing steam blowing,the risk of ammonium bicarbonate crystallization at the top of the deacidification tower is reduced,and the oil content in the raw phenolic water is also reduced,reducing the accumulation of oil in the device and improving the stability of the device operation.
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