The impact of the salt water entering the tank containing excessive sulfate ions!
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This post was last edited by sunjl1981 on 2013-1-6 23:07 The salt water entering the tank contains a lot of sulfate ions, which will cause the sulfate ions to discharge at the anode to produce oxygen, resulting in low chlorine purity. I don’t know if there are any other effects and whether the high oxygen content of chlorine will cause other adverse effects. For example, will CLO2 be generated? Please give me some advice from the experts. # , , &
1. It’s in the diaphragm system! Sulfate ions are discharged at the anode to produce oxygen, resulting in low purity of chlorine. This situation should only occur after reaching a certain concentration. 2. Under this condition, chlorine dioxide will not be generated, but it will only affect the anode efficiency of the cell. ； 3. At the same time, it has a certain impact on the safety of subsequent chlorine product production processes. ； 4. If it is not high, it is said that barium sulfate will deposit on the anode and increase the cell voltage. ； 5. Therefore, the concentration must be controlled within a certain range. ； 6. The impact on the ion membrane is smaller. The main reason is that when the concentration is high, deposition will occur in the membrane, or complex salts will be produced with other substances, causing pinholes. This post was last edited by yzhms on 2008-2-27 21:02 ]
Just to add: It is an ion membrane electrolyzer. “At the same time, it has a certain impact on the safety of subsequent chlorine product production processes. ； ” What is the impact? Can you be more specific?
For the absorption of by-product tail gas during the production of chlorine products, after the chlorine is consumed, oxygen, hydrogen and other gases will accumulate at the end of the production to form explosive gases, causing safety hazards.
1. In the case of an ion membrane battery, sodium sulfate will not electrolyze to produce oxygen on the electrode, but will deposit on the membrane, causing holes in the membrane and affecting current efficiency. 2. It is generally believed that in the case of 10g/l sodium sulfate, the current efficiency will decrease by 1-2% after 100 days of operation.
When sulfate ions are electrolyzed in the diaphragm cell, they will be discharged to produce oxygen, right? Why doesn’t it happen in an ion membrane electrolyzer? Thanks!
The question above is indeed worth answering! 1. There are certain differences in the production principles of diaphragm production and ion membrane production； 2. There is a high concentration of hydroxyl radicals near the anode in the diaphragm cell, which is higher than that of the ion membrane. ； 3. There are also concentration requirements in the production of separators. If sulfate reaches 10 g/l, it will promote the discharge of hydroxide at the anode and produce oxygen. ； 4. In the case of ion membrane, it should be clear.
3. There are also concentration requirements in the production of separators. If sulfate reaches 10 g/l, it will promote the discharge of hydroxide at the anode and produce oxygen.； This means that sulfate ions themselves will not discharge to generate oxygen, but can only act as a catalyst. Yeah?
This is my personal understanding of it. :Lol specifically needs to be compared with the activity of ions and the discharge potential. :L This post was last edited by yzhms on 2008-2-29 18:46 ]
The tolerance of the ion membrane to SO42- is relatively large, because the electrolysis conditions and the structure of the ion membrane determine that it rejects SO42-. However, when the SO42- content in the salt water entering the tank is high, SO42- will be mainly deposited in the form of Na2SO4 or trimer salt (composite crystal formed by Na2SO4, NaCl, NaOH) near the cathode side reinforcement network of the ion membrane, causing physical damage to the ion membrane, resulting in a decrease in current efficiency. Because the crystals are mainly deposited at the reinforcing fiber on the cathode side of the ion membrane, the current at this location is relatively weak, so it affects the current efficiency to a certain extent (dropping to 93% to 94%) and no longer decreases. In addition, Na2SO4 will also react with Ba2+ to form barium sulfate precipitate deposited on the surface of the anode side of the ion membrane, thereby causing the membrane resistance to increase. This post was last edited by Yuanyuan at 2008-3-1 14:30 ]
I think the main thing is Na2SO4, you will see it when changing the membrane.
If the sulfate level is high, oxygen will be produced in the electrolytic cell, which will directly affect the purity of chlorine. If the diaphragm method is used, the electrode will be corroded.
Sulfate will be electrolyzed on the electrode to produce oxygen, sodium sulfate will also precipitate, causing membrane perforation, and high oxygen content in chlorine will cause an explosion: lol
How can chlorine explode if it contains too much oxygen? Can you be more specific?
I'm also curious, can chlorine explode if it contains oxygen? What is the explosion limit? I checked the relevant information and found that chlorine can explode when mixed with steam. Please give me your advice!