Regarding the issue of caustic soda at 32 and saltwater crystallization around 300
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This post was last edited by sunjl1981 on 2013-1-6 at 21:56. Under what conditions do 32 units of caustic soda and salt water with a concentration of around 300 crystallize? We all know that during operation, caustic soda and brine tend to crystallize at points where there are leaks. I assume they have a certain crystallization temperature – what is it? If parked over winter, can caustic soda and brine be stored in their respective tanks? I was wondering, what would be the best way for those of you who are more experienced to handle this??? # + + hcbbs
Reply to 1# Man’s True Nature: For the crystallization of 32% caustic soda and 300 g/l saturated salt water, one can look up their solubility rates; temperature as well as water content are factors that affect crystallization. In winter, as the temperature changes, so does the solubility; when the temperature drops, the solubility decreases and crystals form, which can block the pipes. It is recommended to insulate or use heat tracing for the alkali tank and saltwater storage tanks after the vehicle is parked in winter.
Check the table; it’s on the forum. The alkali and salts in the storage tank during winter should be fine; any crystal formation is only present in a portion at the bottom of the tank. The main problem is that blockages can easily occur in the pipelines and valves. If parking for an extended period, it is necessary to consider draining the liquid from the tank and pipelines.
Reply to 1# Man’s True Nature: Saltwater can be stored in tanks, but it’s best to drain the saltwater from the pipelines and pumps; otherwise, crystallization can occur and cause blockages. In winter, we’ve encountered several instances of crystallization in our pumps, which prevented them from operating. 32. It is best to keep caustic soda at a constant temperature or circulate it through reflux; otherwise, it tends to crystallize in winter.
Thank you all so much! I hope to get more guidance from you in the future!
Reply to 5# Man’s True Nature: 32% ion-exchange membrane caustic begins to crystallize at minus 15 degrees Celsius; especially when the temperature remains below minus 15 degrees for several consecutive days, crystal formation of the caustic is more likely to occur. This can be prevented by insulating the pipes (using steam or electric heating) and keeping the pipes in a state of flow (even a low-speed flow is sufficient)
Reply to 6# whs1964310: In our facility, the brine starts to crystallize and block the pipes even at temperatures around 10 degrees Celsius? Does the presence of sulfate ions have some effect on crystallization?
It should be. There is a low correlation between the solubility of sodium chloride and temperature.