How does your company add sodium carbonate and sodium hydroxide to the brine?
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This post was last edited by sunjl1981 on January 6, 2013, at 20:17. I used to work on chlor-alkali projects. Back then, for the chlor-alkali brine, we added sodium carbonate and sodium hydroxide as follows: In Baffle Tank No. 2, we added sodium carbonate first, followed by sodium hydroxide. Moreover, the amount of sodium carbonate added to Baffle Tank No. 2 was greater than that added to the subsequent reaction tank. However, in the company I currently work for, no sodium carbonate is added to Baffle Tank No. 2; instead, it’s added to the subsequent reaction tank. Only sodium hydroxide is added to Baffle Tank No. 2. I wonder how others handle this process—it’s also necessary to consider the load-bearing capacity of the membrane! # + + . hcbbs
Imported Dozsen chelating resin passing by. . . . . . . . . . . . . . .
Sodium hydroxide is generally added to baffle tank No. 2, while sodium carbonate is added to the first tank of the post-reaction tank; thereafter, the mixture passes through a ceramic membrane
It’s not very detailed. Mine is quite detailed. I’m aware of that too. Hehe, thank you
In our unit, the points where sodium carbonate and sodium hydroxide are added are the same as in your current company. The positions where the brine is treated in your former and current companies are different. I believe this is probably due to the use of somewhat different processes. In the past, chlor-alkali plants used sand filters combined with sintered carbon tube filters for brine purification. Almost all chlor-alkali plants built later on use membrane purification.
The location where the reagent is added is related to the manufacturing process; as for the quantity to be added, it largely depends on the quality of the industrial salt as well as its calcium and magnesium content and ratio.
Excuse me, sodium carbonate and sodium hydroxide are added after being diluted with water, right? So, what should be the concentration when they are added via the baffle tank after dilution? I’m currently working on my undergraduate thesis (the design of a caustic soda production process using the ion-exchange membrane method). I have absolutely no practical experience in this area. I hope to truly learn something from the Haichuan Forum. I hope to receive help from all fellow forum members. Thank you!
I also would like to ask the fellow marine engineers: has anyone used Aspen to simulate the chlor-alkali process? Which units need to be simulated, and in particular, how should the electrolysis unit be modeled?
I posted it in the wrong place. This isn’t the right section for this kind of question; it should be posted in the appropriate section. Hehe
Currently, the main purpose of the process pretreatment is to remove magnesium. When the crude brine contains a relatively high amount of calcium, a portion of it can be removed at the initial stage; otherwise, the subsequent processing load becomes too great, affecting the quality of the treated brine. At present, we remove some calcium at the beginning and some later on