According to market demand, the company plans to produce 95.5% concentrated sulfuric acid. Is the technology feasible?
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This post was last edited by liliang473 on 2009-12-31 12:49. The temperature in winter is too low, and 98% concentrated sulfuric acid is easy to freeze and difficult to store. Based on market demand, the company wants to produce 95.5% concentrated sulfuric acid. The process is to increase the concentration of dry acid and keep adding water to dilute the acid concentration. This operation can achieve the required concentration, but the computer's acid concentration meter shows that it has exceeded the range, and the actual acid concentration can only be calculated based on laboratory results. This is still secondary. The main concern is whether the 95.5% concentrated sulfuric acid has other characteristics, whether it will be detrimental to the equipment, and whether the drying effect will be reduced?
Experts please give me some advice. . .
Generally speaking, the instrument is prone to malfunction when the dry acid concentration is around 93%, and 95.5% should avoid the inflection point on the acid concentration-conductivity curve that occurs when the acid concentration is around 93%, and the instrument problem should be solved.
Leaving aside the instrument, if no water is added to the dry acid, its concentration increases from 93% to 96%. Will such a concentration change have any impact on the circulating acid tank and acid pipeline? some people say: If the acid concentration changes greatly, the oxide film formed in the acid tank and pipelines will easily fail, causing further corrosion until a stable oxide film is formed again after the acid concentration stabilizes. I personally feel that this statement cannot be verified. I don’t know what you think?
Dry acid can completely use 98% sulfuric acid. Ours is 300,000 tons/year. Just dilute the dry acid with water. If the load is stable and the production is stable, the acid concentration table can be ignored. Just do a concentration analysis every hour. There is no technical problem, it’s just that the frequency of analysis is high!
Agree with the 5th floor, you can directly use 96% acid as drying acid. There are analytical instruments for 96% acid on the market. Our drying acid is about 96% acid.
There should be no problem on the meter, but increasing the drying acid concentration will definitely have an impact on the drying effect, which is detrimental to conversion and absorption.
Nanchang Institute has already used 95.4% acid for drying during design, so there is no problem with using 95.5% drying acid. Moreover, the drying effect of 95.5 acid is better than that of 93 acid. At the same time, if the concentration of 93 acid is not well controlled, it may easily cause corrosion of the acid cooler. So if your company’s 95.5 acid is marketable, it is recommended to use it.
Thank you all very much for your suggestions. . .
Where can I buy a 96% concentrated sulfuric acid analyzer?
There is no problem in using 95.5 for dry acid. The main reason is that when the concentration of dry acid increases, the amount of cross-acid acid may increase. It is necessary to calculate the flow rate of the cross-acid pipe. If the flow rate is too high, it will easily wear the oxide layer and corrode the pipeline.