Alkylation
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In the alkylation unit, the water washing tanks in the purification system often become emulsified; water cannot be drained from them, only foam is discharged. It is also not possible to increase the flow rate, as doing so results in oil being carried along with the fluid. The pressure in the water washing tanks is 12.5 kilograms, and the liquid level is 35%
412372706 (Answer forwarded): The pressure in the washing tank is generally around 9 bar; 8 bar is also acceptable. If any operating parameter is too high, foam forms as an emulsion resulting from the mixture of liquefied gas and water, which is a normal phenomenon. When this occurs during drainage, it is necessary to stop the discharge. If foam appears right after the liquid starts to flow, it means that oil or liquefied gas is already mixed in. In such cases, the valve should not be opened wide, as this can lead to leaks; moreover, it becomes difficult to close the valve, which is very dangerous.
If the water is not changed for an extended period, the oil will become alkaline. Isn’t it true that the higher the pressure, the better the separation effect?
How can water become alkaline if it isn’t changed for a long time? I don’t understand; over time it should become acidic, and it can’t remain alkaline. A base heater is used to heat the base, causing the dialkyl sulfates to decompose into hydrogen sulfide, sulfur oxides, and hydrocarbons. Hydrogen sulfide and sulfur oxides then react with the alkaline solution, so the solution no longer remains alkaline
Consider the issue of conductivity – pay more attention to it!
We use acid washing, alkali washing, and water washing; we haven’t switched to electric methods yet
Acid washing – alkali washing – water washing; the water in the washing tank is not changed for a long time, and of course the water in that tank is alkaline. The coalescer used later fails to remove water completely, so the oil naturally contains alkali