Method for pretreatment of refinery feed for desalting the feedstock, and related additive

摘要

This disclosure sets out a metal salt removal procedure for use with a crude oil flow. A small amount of water is injected to form water bubbles surrounded by oil. An ethylene oxide reacted with polypropylene glycol at 350 DEG F. or so yields a water soluble demulsifier added at the rate of a few ppm to the water in oil mix. The added reaction product, a polyol enables metal salt isolation in the water.