An ammonia vaporization issue
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When evaporating the remaining ammonia water in a coking plant, an alkaline solution needs to be added to the feed pipe of the ammonia evaporation tower. What kind of base is this? What is the typical concentration? What is its specific function?
38% sodium hydroxide, used to adjust the pH value
Liquid caustic, 32.5%, deionized
32% or 40%, to adjust the pH value,
Sodium hydroxide at a concentration of 30% is used to decompose the fixed ammonium salts in the remaining ammonia solution; it is generally mixed with the remaining ammonia solution before it enters the tower.
About 30% liquid alkali is used to decompose ammonium salts
What is added is liquid alkali, NaOH; concentrations of 40% and 50% are used. Its function is to decompose fixed ammonium salts, and it can also be considered as a means of adjusting the pH value, or of neutralizing the acidity increased by *ao acid after ammonia evaporation
Actually, well. I’ve also seen 5% levels; the concentration isn’t that important – just control the pH value of the effluent properly
Sodium hydroxide at 32: to remove fixed ammonia
Break down fixed ammonium salts and adjust the pH value