Prepare caustic soda
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How to prepare 20% caustic soda for absorbing accidental chlorine gas? Is there a certain proportion?
We all use a concentration of around 15%, which is the dilution level for ion-exchange membrane caustic; it can be calculated fairly easily. It’s sufficient to conduct multiple sampling analyses; once experience is gained, it becomes easier. . . It just needs to be more or less okay; it’s not necessary to be extremely precise
This post was last edited by ylb913 on 2015-6-11 07:09. Knowing the concentration and density of strong alkalis, as well as the density of a 20% alkaline solution, allows for accurate preparation of such solutions. However, in actual industrial applications, it’s not necessary to be that precise; a rough approximation is sufficient. After mixing concentrated alkali with water, stirring is required, using air or a pump. For the specific gravity of alkaline solutions, I generally use the rule that 10% has a specific gravity of 1.1, 20% has 1.2… and 50% has 1.5; this is easy to remember. Density of alkali solutions at various concentrations: 9% 1.099, 10% 1.109, 15% 1.161, 18% 1.192, 20% 1.219, 26% 1.275, 28% 1.296, 30% 1.328, 33% 1.348, 36% 1.379, 40% 1.430, 48% 1.504
Don’t all storage tanks have level gauges? A rough estimate is sufficient; it’s usually around 15%. If the level is too high, salt precipitation can occur, while if it’s too low, less chlorine will be absorbed, requiring more frequent additions of alkali.
Let me tell you, ours has an acidity level of 15-18%, which is roughly a 1:1 ratio; for 20% acidity, it’s also approximately a 1:1 ratio. There are detailed explanations available on that
The alkali concentration used for accident absorption is set too high, making the pipes prone to blockage by crystalline salts.