Is it necessary to cool concentrated sulfuric acid during the chlorine drying process?
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This post was last edited by sunjl1981 on 2013-1-6 at 22:56. During the chlorine drying process, concentrated sulfuric acid is generally added from the top of the bubble column; however, it’s not clear whether it’s necessary to cool it, as some process books mention that it can be added without cooling. I hope everyone can give me some advice. # hcbbs
Cooling is not necessary, but the circulating acid must be cooled! Concentrated sulfuric acid absorbs the moisture from chlorine, releasing heat; this causes the saturated vapor pressure to rise. As a result, more moisture is carried away by chlorine, increasing the water content in it! It is recommended to cool down
The sulfuric acid used in our company’s bubble column is cooled by chilled water; reducing the temperature of the sulfuric acid enhances its water absorption capacity. Of course, the temperature cannot be too low, in order to prevent the sulfuric acid from crystallizing.
It should be added, as the cooling device reduces the temperature of concentrated sulfuric acid as it enters the tower, which helps to control the temperature of the absorption tower and is beneficial for the operation process.
Cooling the circulating concentrated sulfuric acid is necessary, but it should not be too low to prevent sulfuric acid crystallization. The newly added concentrated sulfuric acid depends on the temperature; the suggestion from Floor 2 is supported
Cooling concentrated sulfuric acid is very effective in reducing the moisture content of chlorine gas, but the temperature should not drop below 10 degrees, otherwise the sulfuric acid tends to crystallize.
We did not cool it before entering the tower, but the tray of the bubble column is equipped with cooling devices
Most manufacturers use probes to cool the acid flowing through the tower layers. However, there is a problem with cooling the sulfuric acid entering the tower: the flow rate is too low, resulting in poor heat exchange efficiency.
Actually, this is a matter of personal opinion. In my opinion, at room temperature, concentrated sulfuric acid enters the top tray of the bubble column and moves downward layer by layer, then reaches the packing layer where it circulates to absorb moisture. The sulfuric acid in the packing layer is cooled during this circulation process, which ensures that the temperature of the chlorine gas entering the bubble column does not become too high. Can it be understood that if the load on the bubble column is high and this affects the removal of water from chlorine gas, then concentrated sulfuric acid can be cooled before it enters the bubble column; if the load on the bubble column is not high, then cooling it in advance is not necessary. The method to determine whether cooling is applied or not can be based on the temperature of chlorine gas entering and leaving the tower.
To achieve cooling, acid is generally fed from a sump into a pump, from there into a circulating cooler, and then into the drying tower; it is advisable to provide cooling within the drying tower as well to ensure effective drying