I would like to ask about methods other than using sulfuric acid
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Our company has a solution that contains 30% sulfuric acid, as well as a costly substance with a molecular weight of around 160, present in a saturated state. The pH value is 4-5. To remove sulfuric acid an, but also to recover substances with high costs, it would be best to remove some of the water? Is there any way? I would like to add more details: At present, our company uses a method of pressure reduction and concentration at temperatures below 100 degrees Celsius to precipitate sulfuric acid an, followed by filtration to remove salts, after which the filtered liquid is reused. However, the high-value substances I intended to recover were already at saturation from the start; as a result, a certain amount of these substances ended up in sulfuric acid AN during the filtration process and could not be recovered. Ion exchange was also tried; high-value substances are lost in even greater amounts during the removal and regeneration of the resin solution. Also, this substance is an organic acid. I would be very grateful if you could help. More than 10 T of sulfuric acid An needs to be filtered every day. This post was last edited by styjia on 2009-3-11 10:47]
It is recommended that you contact the Nanjing 95 High-Tech Membrane Research Institute to filter out the salt and then recover the valuable substances
If the high-priced substance is an organic compound, sulfuric acid AN can be removed through ion exchange.
What is the nature of this expensive substance? Is heating for concentration allowed? Can it be separated by removing some water through concentration, cooling for crystallization, and filtration? What is its solubility? Can it be extracted using organic solvents? If that doesn’t work, membrane separation technology can be considered.
What is that other substance? Could the original poster explain it clearly? How can I solve your problem without knowing the exact physical properties! Crystallization, extraction, distillation, membrane separation, salting out, adsorption, and reaction can all theoretically be used as separation methods to solve your problem.
Adding barium hydroxide will do; after the reaction is complete, barium sulfate is filtered out, and then heating is used to remove ammonia. Provided that your valuable substances are stable in nature. :lol
I would like to add more details: Currently, our company uses vacuum concentration to precipitate sulfuric acid an, followed by filtration to remove salts, and the filtered liquid is then reused. However, the high-value substances I intended to recover were already at saturation from the start; as a result, a certain amount of these substances ended up in sulfuric acid AN during the filtration process and could not be recovered. Ion exchange was also tried; high-value substances are lost in even greater amounts during the removal and regeneration of the resin solution. Also, this substance is an organic acid. I would be very grateful if you could help.
Barium hydroxide is too expensive, and more than 10 T of sulfuric acid an needs to be filtered out every day, which is not feasible
You’d better tell everyone what the name of that high-priced organic acid is Check the solubility properties of your high-priced organic acids – in what solvents do they dissolve? Solvent extraction separation using the solvent with the best solubility is chosen, followed by distillation to remove the solvent. I’m not sure whether your organic compound can withstand high temperatures Is it a solid at room temperature? Is it still an aqueous solution? Is it feasible to concentrate the mother liquor, crystallize it, filter it, and wash it?
The original poster doesn’t mention what kind of organic acid this is, so everyone is welcome to guess. I guess the molecular formula is C2H2F2O4S!
For a 30% aqueous solution of sulfuric acid, using reverse osmosis or nanofiltration would require an operating pressure of over 150 atm. The operating pressure for conventional reverse osmosis is typically between 30 and 70 atm. Furthermore, the solubility of sulfuric acid an at 0 degrees is around 41%, and at 100 degrees it is around 51%. As soon as it’s used, crystals will form and block the membrane.
If the concentration of sulfuric acid an is below 1%, it is possible to use separate strongly basic anion and cation exchange resin beds. But the concentration of sulfuric acid An is 30%.
““Membrane separation technology can be considered,” and this membrane technology should not be reverse osmosis, nanofiltration, or electrodialysis.
What’s the price of anhydrous sulfuric acid? What is the price of barium hydroxide? The toxicity of barium hydroxide? The price of ammonia? Heating to remove ammonia? Then distillation is needed; barium sulfate scaling is a major problem. This post was last edited by yjqin1 on 2009-3-11 17:06.]
Adding lime water works, and it’s cheap too!
This is a factory operation project; producing 10 tons of waste gypsum per day by adding lime is not acceptable to the factory. Ammonia water produced in this way is also catastrophic when attempting to recover ammonia using distillation. The original poster had better provide the names of the organic acids, so as not to let everyone come up with random suggestions. There must be ways, and the cost won’t be too high.
I guess it’s taurine; haha, that is 2-aminooctanoic acid. OP, do you think I’m right?
The molecular weight of taurine is 125, which does not match what the original poster described; however, it is not ruled out that the poster is trying to mislead us. Given the presence of sulfuric acid, it is very likely to be taurine!
Whatever this expensive organic acid is, it is best to choose a solvent that is immiscible with water and has high relative solubility for extraction. If the extraction is incomplete, concentration can be considered next. If sulfuric acid an crystals precipitate, they can be filtered (the filter cake should be washed with the solvent to minimize losses), and the filtrate can be used for further extraction. In any case, sulfuric acid An must be concentrated and extracted; otherwise, the environmental protection authorities will not allow it.
Use high-purity slaked lime; the gypsum produced will have good whiteness and high purity, allowing it to be sold at a good price. For companies like the one mentioned by the poster, if lime treatment is used, 10 tons of gypsum are produced per day; ways can be found to further process this gypsum. I think the solution using lime water is feasible.
Original poster, if you use lime water, please contact me. My specialty is the production and distribution of high-purity lime. QQ:27037381