Seeking help: Atmospheric pressure dehydration of naphtha
Thread Content
During the atmospheric pressure dehydration of naphtha, the naphtha becomes cloudy, and the aqueous phase also takes on a milky white appearance. What is the reason for this? How was it caused?
The turbidity may be due to an oil-water emulsion; it could also be caused by the introduction of corrosion inhibitors or neutralizers during the anti-corrosion treatment at the tower top, which leads to the formation of an emulsion in the naphtha during dehydration.
Is it possible for corrosion inhibitors or neutralizers to be vaporized during the atmospheric distillation and dehydration of naphtha?
The naphtha distillation dehydration corrosion inhibitor and neutralizer do not escape at atmospheric pressure; oil-phase erosion may be caused by poor temperature control leading to water entry or by contamination of the receiver.
For the naphtha distilled out, water accumulates at the bottom of the tank after it is left to stand; the aqueous phase is turbid and milky in color. What is the reason for this?
It could also be some demulsifiers added during crude oil extraction, or anti-friction agents used during pipeline transportation
Reply to 5# *aofang8248: The turbidity of the aqueous phase is due to oil in water, with extremely fine oil droplets dispersed in the aqueous phase
Can demulsifiers and drag reducers be introduced into naphtha during distillation? Can these additives be identified to determine which ones they are?
How to cause an aqueous emulsion to separate into layers? I tried leaving it for a few days, but no separation occurred; neither did it separate after being heated
Currently, inhibitors are often added to prevent interruptions, but it’s not clear whether this is effective. When exposed to water and temperature, this substance forms a flocculent, turbid substance; moreover, the gums present in naphtha undergo a saponification reaction with water, also resulting in a turbid substance, and this is an irreversible reaction
Reply to 9# *aofang8248*: Try adding a water-soluble reverse-phase demulsifier to the aqueous phase, heating the mixture and stirring to effect demulsification; you can send the aqueous phase sample to the demulsifier manufacturer.