Is it feasible to directly introduce liquid ammonia into water to produce ammonia solution?
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In industrial production, can liquid ammonia be directly added to water to produce ammonia water? If not, how can this be resolved?
Liquid ammonia should be stored at a pressure that is higher than its saturated vapor pressure at the storage temperature, in order to keep it in liquid form. One method is storage at room temperature, with a typical operating pressure of around 1.3–1.6 Mpa; the design pressure should be set at 2.16 Mpa. Another method is storage under atmospheric pressure, in which case the temperature must be kept below -33.4 degrees Celsius. For storage at room temperature, I believe there is no major issue with introducing liquid ammonia pipelines into water; however, for storage at low temperatures, when the liquid ammonia is directly introduced into water, the problem of ice buildup and blockage at the outlet should be taken into consideration.
Sure, there can be stirring inside the tank, or a static mixer can be used for mixing
Directly introducing liquid ammonia shouldn’t work; it needs to be vaporized first before being introduced. Moreover, it cannot be guaranteed that ammonia gas will not escape after rising above the liquid surface. Using a spraying device is more efficient than introducing the liquid underwater; it’s best to consult literature and patents to see how others actually do it
It is difficult to absorb after vaporization, and it is costly to ensure that no ammonia escapes at the outlet. . .
The dissolution of liquid ammonia in water should be a highly exothermic process, which causes the liquid ammonia to vaporize and increase the pressure. It should work if a small amount of liquid ammonia is introduced into a large amount of water. If it’s on a large scale, the risk is quite high.