Discuss the control range of the three indicators in the joint alkali production process?

a 2.2-2.35 b 1.04-1.12 At first glance, it seems to be a very random choice. Actually no, you can divide a/2, and you will find that 1.1-1.175 is very close to the b value. 0.075/1.1=0.068 0.08/1.04=0.077 Why should a be greater than 2? Because of bicarbonate.

The α value is: AⅠFNH3/CO2 β value is: AⅡFNH3/NaCL γ value is: The α value of Na+/MIICNH3 ammonia mother liquor I is controlled at 2.15-2.35. If the α value is too high, the volatilization loss will increase due to the increase in the equilibrium partial pressure of ammonia in the mother liquor, worsening the operating conditions. ； On the contrary, if the α value is too low, the bicarbonate in the mother liquor will eutectoid with ammonium chloride, reducing the quality of the ammonium chloride product and increasing the loss of ammonia, salt and carbon dioxide. Therefore, it is necessary to control the appropriate free ammonia in the ammonia mother liquor I to ensure that the α value is within the specified range. The IIβ value (FNH3/NaCl) of ammonia mother liquor is controlled at 0.95-1.02. Because the total reaction of the alkali production process is a reversible reaction, increasing the concentration of the reactants (NaCl, NH3 and CO2) can promote the reaction in the direction of the products, which is beneficial to the production of sodium bicarbonate and ammonium chloride. Therefore, the sodium chloride should be saturated and the carbon dioxide concentration should be as high as possible (or the carbon dioxide pressure should be increased) before the solution is carbonated. On this basis, the concentration of free ammonia in the solution should also be appropriately increased, and a high ammonia-to-salt ratio should be maintained. However, the concentration of free ammonia cannot be too high, otherwise a large amount of ammonium bicarbonate crystals will precipitate during the carbonation process, causing problems such as clogging of the carbonization tower and increased ammonia loss. In the production of joint alkali, it is required that the ratio of free ammonia to sodium chloride in the alkali solution after carbonation is close to 1 ； At this time, the output per unit mother liquor is higher and the ammonia loss is lower. Practice has proved that in the case of concentrated gas alkali production, it is more appropriate to control the β value of ammonia mother liquor II at 0.95-1.02. Usually the γ value is used to determine the amount of salt added, ranging from 1.58-1.75. If it is lower than this range, it means too little salt is added, and if it is higher than this range, it means too much salt is added.

I found that the beta value you set is relatively low. What I want to know is, are you talking about the ingredients after clarification?

This is also the value adjusted in recent years. I haven't been on the production line for a long time, so I can't give you a better answer. But I know that the beta value is adjusted for recent years. As far as I know this was not the case before. Be higher.