A frequently asked question: the problem of acidic water emulsification at the top of coking fractionation towers

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I’ve read many posts about the emulsification of acidic water at the top of distillation columns, and the answers given were all rather vague, probably due to unclear questions from the poster. Now I will talk about the problem of emulsification of acidic water at the top of our unit’s distillation tower. During normal operation, the acidic water remains milky white; it does not become emulsified only at certain times such as after tower cutting, but remains emulsified throughout ； We stopped work last December. A few days ago (about a month later), I occasionally saw samples of acidic water taken before the shutdown – they had been sedimenting for over a month – and they were still milky white, though slightly lighter in color, with a layer of oil floating on top. The raw material is imported 380 fuel oil, along with Ma Rui crude oil that has been processed for some time; the acidic water at the top of the tower is almost identical in nature. The top temperature is controlled at 125 degrees. The question now is how to completely separate water from oil in order to directly increase the yield of oil products. If a demulsifier is used, what type (model) of demulsifier should be used?