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CRUDE UNIT OVERHEAD CORROSION CONTROL BY ION CHROMATOGRAPHY

This article covers the subject of analysing inorganic salts in crude oil. Great importance is put on the composition of the salts because of their influence on the crude refining process. It is known that crudes contain mainly chlorides of sodium, calcium and magnesium. The last two produce hydrochloric acid as a result of hydrolysis reaction and consequently cause corrosion in the overhead systems of crude oil distillation plants. Desalters are special devices for removing salts from crude oil using wash water. The purpose of this process is to concentrate salts in the water phase and reduce their concentration in crude. Analytical laboratories control desalting by testing the salts in the process water as well as in the crude oil. Analyzing inorganic compounds in organic phase is usually complicated and difficult to perform. Therefore, laboratories analyze chlorides only in crude oil assuming that the other compounds are washed out proportionally. In spite of the fact that this is the accepted way for evaluating the salts content in crude oil, it is very important to know the concentration of other salts in order to control the process and to understand the relationships between operating variables and effects. We suggest using Ion Chromatography in order to analyze different ion concentrations simultaneously, quickly and accurately.