Method for predicting drop size distribution

Abstract

The present invention relates to crude oil-water separation processes, specifically desalting in a petroleum refinery. More particularly, the present invention relates to a method and system for increase coalescence rates of water drops in a desalter

1 . A method of predicting drop size distribution comprising:
 a. producing a bimodal drop size distribution, wherein the bimodal drop size distribution is produced by providing a constant fresh water stream and a constant crude oil stream through at least one mixing valve resulting in a mixed feed stream;   b. continuously introducing the mixed feed stream into a vessel, wherein the vessel includes an electric field;   c. estimating a cut-off radius, wherein any drops larger than the cut-off radius settle to the bottom of the vessel; and   d. monitoring the rate of water removal from the vessel.   
     
     
         2 . The method according to  claim 1 , wherein the bimodal distribution is the linear combination of two unimodal distributions. 
     
     
         3 . The method according to  claim 1 , wherein the vessel is a desalter. 
     
     
         4 . A method of predicting drop size distribution comprising:
 a. producing a bimodal drop size distribution, wherein the bimodal drop size distribution is produced by providing a constant fresh water stream and a constant crude oil stream through at least one mixing valve resulting in a mixed feed stream wherein the bimodal distribution is the linear combination of two unimodal distributions;   b. continuously introducing the mixed feed stream into a vessel, wherein the vessel includes an electric field, wherein the vessel is a desalter;   c. estimating a cut-off radius, wherein any drops larger than the cut-off radius settle to the bottom of the vessel; and   d. monitoring the rate of water removal from the vessel.