Ammonia-based soda ash

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1. Selection of temperature. There are two aspects to consider when selecting the ammonia absorption temperature. First, a lower temperature is beneficial to the exothermic ammonia absorption process. Second, if the temperature is lower than 60°C, crystallization will occur during the ammonia absorption process and cause blockage. Taking these two points into consideration, the process flow is equipped with multiple coolers to ensure the smooth progress of ammonia absorption. During production, the brine is cooled before entering the ammonia absorption tower and maintained at about 35-40°C. The ammonia gas from the distillation tower is generally cooled to at most 58-65°C. The temperature of the ammonia brine exiting the tower is about 38-42°C and the temperature of the circulating ammonia brine drops to 40±2°C. 2. The choice of pressure. The entire ammonia suction system is operated under negative pressure to such an extent that it does not hinder the downstream flow of salt water. ； Although pressure reduction is slightly detrimental to ammonia absorption, it can avoid losses and facilitate the operation of evaporating ammonia. Generally, the air inlet pressure of the ammonia absorption tower is ≤13.3KPa (gauge pressure). 3. I don’t know what the “use and consumption rate of circulating gas” specifically refers to. Please provide additional explanation. ； If it refers to the systematic circulation of ammonia and carbon dioxide, please read the book "Alkali Production Technology" in detail, and you will definitely gain something.