Is sulfuric acid added continuously during chlorine drying?
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This post was last edited by sunjl1981 on 2013-1-6 at 23:15. In our plant’s process, the concentrated sulfuric acid coming out of the bubble column is directly fed into the bottom of the packed column; part of it flows out as dilute acid. I think this results in waste of that portion of concentrated sulfuric acid. Does your factory operate in an intermittent manner to avoid waste? This post was last edited by limingshuguang on 2007-12-4 at 14:26. # &
The concentrated sulfuric acid added to the bubble column is supplied continuously, while the dilute sulfuric acid in the packed column is discharged intermittently. By measuring the specific gravity, it is generally kept around 1.68; if it is lower than this value, it is sent to the dilute acid tank. Usually, we discharge it once or twice per shift. It’s a waste to emit high concentrations continuously.
In fact, it’s normal for a portion of the dilute acid to flow out, as the sulfuric acid in bubble columns and packed columns needs to absorb moisture, which naturally increases its volume; therefore, some acid has to flow out. What’s important is to analyze the concentration of the sulfuric acid to ensure it remains within the required parameters, thus maintaining normal production operations and reducing sulfuric acid consumption. Our factory does the same: regularly, the sulfuric acid in the packed tower that has reached the lower limit of the specified concentration is pumped into the dilute acid storage tank for sale.
We usually discharge when it’s below 75%
The concentrated sulfuric acid added to the bubble column is supplied continuously, while the dilute sulfuric acid in the packed column is discharged intermittently; our plant adjusts the continuous supply amount based on the test results
Regarding the high water content requirements for turbine compressors, what is the concentration control level for dilute sulfuric acid at various companies? At high concentrations, crystallization tends to occur during winter at levels of 80–85; at low concentrations of 75–80, proper dehydration and drying become a problem. It’s a dilemma
I was wondering if any of you have structural diagrams of bubble column reactors and packed tower reactors; I would be very grateful! ! ! daichb@163.com
1. Acid discharge can be carried out intermittently; generally, one discharge per shift is sufficient. A control valve can also be used to adjust it according to the liquid level, which will prevent fluctuations in system pressure during acid discharge! 2. A sulfuric acid concentration of 75% should be sufficient; it is advisable to insulate the sulfuric acid pipeline, then provide heating, and insulate it again, so that even at a higher concentration crystallization will not be a problem. 3. The structural diagram of the tower can be found in a book on \"Principles of Chemical Engineering\" or \"Chemical Engineering Machinery\"; it’s very simple! This post was last edited by Captain Yang on 2008-3-31 20:04.]
As three different types of membranes, are the startup conditions, commissioning time, and process control parameters for Asahi Kasei, Asahi Sales, and DuPont membranes the same? Is this related to the type of electrolyzer? In the chlorine production electrolyzers I have worked with in the past, Asahi Sales and DuPont membranes were generally used; when new membranes were installed, brine had to be circulated in a single loop for 48 hours (the brine fed into the electrolyzer was only purified brine, with no recycled brine), and the current level was not at full capacity (approximately 90% of full load)； As for the Asahi Kasei electrolyzers we are dealing with now, which generally use Asahi Kasei membranes and DuPont membranes, this approach is not being followed; instead, the same operating conditions as those used with the old membranes are applied. Therefore, I would like to ask for your advice?
We discharge dilute sulfuric acid continuously, with a concentration of 70%-80%
In our system, three drying towers are used in series. Concentrated sulfuric acid is continuously added to the bubble section of the third drying tower. All three drying towers have overflow ports for storing acid; the acid from the third tower overflows into the second tower, that from the second tower into the first tower, and the acid with a concentration of around 80% in the first tower then overflows into the waste acid tank. Both the addition of acid and the removal of acid occur on a continuous basis.