Relationship between demulsifier and pH value
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I have recently been working at a local state-owned enterprise, where the processing capacity is 8 million tons per year, and I am involved in atmospheric and vacuum distillation technologies. When I asked about the amount of demulsifier to be added before electrodesalination, he said it should be adjusted based on the pH value. Is there a relationship between them? Master Men, thank you!
Demulsifiers are used in electrodialysis to break down the emulsion layer; they have nothing to do with pH value. There’s some confusion here. This is it. What is related to the pH value is mostly the ammonia injection at the top of the tower, I guess
I checked on Baidu and it says that the demulsifier achieves the best dehydration effect when the pH value is set at 6-7
Note: The demulsifier has little to do with pH value; the dosage is 20–30 ppm for water-soluble types and 10–15 ppm for oil-soluble types. Generally, for electrodialysis desalination units, it is important to maintain the pH value of the water used for injection, as most manufacturers use desulfurized purified water instead of demineralized water. The pH range of this desulfurized purified water can be quite wide; it is recommended that the pH not exceed 8, and the ammonia nitrogen level should not be higher than 150 mg/L. Otherwise, this will exacerbate emulsification and increase the oil content in the wastewater.