Control of tail water concentration in concentrated nitric acid using the magnesium nitrate method
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For the control of the concentration of the water from the tower bottom in concentrated nitric acid using the magnesium nitrate method, the typical range is 10–30%. However, some companies aim to recover certain substances and deliberately increase the acidity level of this water to around 45% for recovery purposes. Question 1: Is this beneficial for the venting of exhaust gases? (That is, what is the color of the released air?) ) 2. How high can the tailwater level of the tower be raised? (That is, what is the saturated acid concentration of the tower tail water?) ）
We usually control it at 45%; if it exceeds that level, it is sent back to the dilute nitric acid tank. We built our own absorption device for the tail vent. No yellow smoke. As for the saturated acid concentration, no studies have been conducted.