Key issues regarding demulsifiers
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The demulsifier is injected after being mixed with water. Should the concentration of this demulsifier be kept around 2 percent? What effects will occur if it is set at 10 percent, as that would represent a higher concentration?
Too high a concentration hinders dispersion, leading to uneven distribution in the pipes and easy deviation of the chemical flow
In other words, when the concentration is high, less total amount of demulsifier and water is used; whereas when the concentration is low, a larger total amount is required. The demulsifier is added in accordance with the requirements of the crude oil, only the concentration and the amount of water vary. Our system uses a demulsifier with a concentration of over 5%, mixed with water and injected at a rate of 20 kg per hour. If a demulsifier with a 2% concentration is used, it is mixed with water and injected at a rate of 50 kg per hour. Is there any difference?
I agree with what was said above: demulsifiers are not a panacea; once a certain amount has been added, further addition no longer has a significant effect. As for concentration, there’s no need to control it deliberately; the amount of water added is done in accordance with design specifications, and it has little to do with the concentration of the demulsifier. I remember that we used an oil-soluble demulsifier, so it didn’t need to be reinjected in the secondary electrodialysis stage. Since it is oil-soluble, it can dissolve in crude oil at any concentration.
In the demulsifier tank, in addition to the demulsifier, there is also deionized water. So, how should the concentration of the demulsifier in this tank be controlled?
In the demulsifier tank, in addition to the demulsifier, there is also deionized water. So, how should the concentration of the demulsifier in this tank be controlled?
Demulsifiers are divided into oil-soluble and water-soluble types; for oil-soluble ones, the amount added should be sufficient to reduce losses, while for water-soluble ones, less should be added if their concentration is high
In the demulsifier tank, it’s the dissolution rate that matters, right! There should be a standard for demulsifiers. Don’t need to calculate the water amount for injection, right? (For example, a mixing tank with a capacity of 10 cubic meters.) Add 1 cubic meter of demulsifier to 9 cubic meters of water and dissolve it. For calculations, 1 cubic meter of demulsifier is taken as equivalent to a level of 100 on the gauge; there is no need to account for water, meaning that one level unit corresponds to 10 kg. ）
Personally, I think there is no need to deliberately control the concentration; it is sufficient to ensure that the concentration in the tank remains constant, as well as the amount of liquid added. This ensures that the demulsifier added to the crude oil remains unchanged. Then, adjust the dosage based on the current and desalination efficiency. The concentration should not be so high that solid particles precipitate, and it should not be so low that the pump, even at its maximum capacity, is unable to deliver enough demulsifier – that’s sufficient.