Determination of desulfurization solution
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I wonder if any of you have done analysis on desulfurization liquid; if so, how do you proceed? Our method is quite complex; it requires multiple filtering steps. I’m not sure if there’s a simpler way – please advise! Measure sodium sulfate, sodium thiosulfate, and suspended sulfur in the desulfurization solution! This post was last edited by zjs0536 on 2009-3-25 12:35.]
If you need information in this area, please contact me. QQ 51339594. Or tell me your email address.
Thank you first; I can’t give a rating now, but I will do so later! Hehe!
Could you please provide me with an analysis procedure?
I suppose you work in an ammonia synthesis plant as well; don’t all such places have analysis procedures? If you’re not satisfied, you can simply optimize them yourself, right? haha. This post was last edited by *aoye613 on 2009-4-2 09:43.]
How to optimize? Even if it’s optimized, it still needs approval from above!
I earnestly ask those who are more knowledgeable for their advice! This post was last edited by zjs0536 on 2009-4-1 18:18]
It’s fine according to the \"Analysis Procedures for Small Nitrogen Fertilizers\"! Analysis is itself a rather complicated task!
Do you have the \"Procedures for the Analysis of Small Nitrogen Fertilizers\"? Our analysis method requires three filtering steps; it’s too complicated, with too many processes, which results in large deviations in the outcomes!
Determination of suspended sulfur in solution 1. Analytical principle: Elemental sulfur in the solution can react with sulfurous acid to form sodium thiosulfate; the excess sodium thiosulfate is destroyed by formaldehyde. The sodium thiosulfate formed is then measured using the iodometric method under slightly acidic conditions, thereby determining the sulfur content. Reaction: Na2So3 + S → NaS2O3; Na2So3 + H–C< + H2O → < + NaOH; Na2So3 + I2 → NaI + Na2S4O6.
Equipment and reagents: Refraction condenser, funnel, 50 ML beaker; 5% sodium sulfite, 30% acetic acid, 20% formaldehyde; 0.1 mol/L sodium thiosulfate, 0.1 mol/L iodine, 1% starch indicator.
Method: Vacuum filtration is not applicable. Under thorough stirring, 25 ML of the sample is transferred into a 50 ML beaker and heated to near boiling (60–80°C) to cause the sulfur to form lumps, which are then filtered off. The residue is washed with hot water until no more sodium thiosulfate remains. The precipitate, along with the filter paper, is placed in a 250 ML Erlenmeyer flask. 20 ML of 5% sodium sulfite is added, and the mixture is heated under reflux for 45–60 minutes before being allowed to cool. Then, 10 ML of 25% formaldehyde is added, and 30% acetic acid is added dropwise using phenolphthalein as an indicator until the red color disappears; an additional 3–5 ML of acetic acid is added thereafter. Finally, 20 ML of 0.1% iodine solution is added, and the solution is titrated with 0.1 M sodium thiosulfate, using starch as an indicator, until the blue color disappears. Calculation: Suspended sulfur content (g/L) = (V2 – V1) * 0.1 * 32 = (V2 – V1) * 0.128. In the formula: V2 = volume in milliliters of 0.1 MOL/L iodine added; V1 = volume in milliliters of 0.1 MOL/L sodium thiosulfate used; 32 = molar mass of sulfur, in g/mol
Equipment and reagents: Refraction condenser, funnel, 50 ML beaker; 5% sodium sulfite, 30% acetic acid, 20% formaldehyde; 0.1 mol/L sodium thiosulfate, 0.1 mol/L iodine, 1% starch indicator.
Method: Vacuum filtration is not applicable. Under thorough stirring, 25 ML of the sample is transferred into a 50 ML beaker and heated to near boiling (60–80°C) to cause the sulfur to form lumps, which are then filtered off. The residue is washed with hot water until no more sodium thiosulfate remains. The precipitate, along with the filter paper, is placed in a 250 ML Erlenmeyer flask. 20 ML of 5% sodium sulfite is added, and the mixture is heated under reflux for 45–60 minutes before being allowed to cool. Then, 10 ML of 25% formaldehyde is added, and 30% acetic acid is added dropwise using phenolphthalein as an indicator until the red color disappears; an additional 3–5 ML of acetic acid is added thereafter. Finally, 20 ML of 0.1% iodine solution is added, and the solution is titrated with 0.1 M sodium thiosulfate, using starch as an indicator, until the blue color disappears. Calculation: Suspended sulfur content (g/L) = (V2 – V1) * 0.1 * 32 = (V2 – V1) * 0.128. In the formula: V2 = volume in milliliters of 0.1 MOL/L iodine added; V1 = volume in milliliters of 0.1 MOL/L sodium thiosulfate used; 32 = molar mass of sulfur, in g/mol
The determination of suspended flow content* has been learned