Concentration of the circulating alkali solution in the primary tower of the accident chlorine absorption process
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This post was last edited by sunjl1981 on 2013-1-6 at 20:04. The concentration of the alkaline solution in the primary tower cycle is less than 5%; however, to save on the consumption of caustic soda, it can be used on until the NaOH concentration drops below 2.5%, at which point it should be transferred to a new tank. This method is used in normal production; during startup and shutdown, there is a relatively high amount of residual chlorine, so it is necessary to use a circulation with an alkali concentration of over 10% in order to ensure a sufficient safety factor. Please share how your organization approaches this. . Note♀ ) # ♀ , .
We generally guarantee over 20%, using larger storage tanks to ensure safety.
We use 15%, and to ensure no chlorine leakage during startup and shutdown, we try to avoid using lower concentrations.
8%–21%, generally not exceeding 21%, determined mainly based on the required effective concentration of sodium hypochlorite produced.
We use 30% absorption to prevent chlorine leakage!
For the one on the 5th floor, using 30% absorption ensures that it won’t react with large amounts of chlorine during driving. Then the issue of salt accumulation in the tower? We have encountered this issue before; we didn’t pay attention to controlling the alkali concentration and used 30% alkali directly for the cyclic absorption of chlorine. As a result, once operation started, salt buildup in the tower became extremely severe. The entire accident tower has no absorption effect
We usually keep it at no less than 8%. Generally, we use diaphragm alkali as the circulating fluid; using ion-exchange membrane alkali as the circulating fluid can result in lower costs. Higher security means better protection. Generally, sodium hypochlorite can be used to keep the level a bit higher; alkali is absorbed to produce sodium hypochlorite.
We sell sodium hypochlorite as a product, with the effective chlorine content maintained at over 10%, which requires the alkali solution concentration to be kept above 16%.
Hmm, I hadn’t noticed this issue before; I’m coming to learn about it*
Our facility is set at 16%, and after the alkaline content is increased to 3–5%, it is sent to the hypochlorite production process to yield finished hypochlorite. Additionally, I would like to know how many towers your company uses for exhaust gas absorption? In case of abnormal conditions, when a large amount of chlorine gas enters the exhaust gas absorption system, it is impossible to absorb it completely even if the concentration of the alkaline solution in the first tower is high; a significant portion of the chlorine gas will not be absorbed. It is recommended to use three exhaust gas absorption towers, as this ensures a high level of safety!
It should be 15%–20%; that’s a better concentration range for control