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Phosphate Esters Inhibitors in Naphthenic Acid Corrosion – An Experimental Evaluation

Crude oils with a total acid number (TAN) higher than 0.5 are highly corrosive at temperatures between 400 and 700°F typical to atmospheric and vacuum distillations of oil refineries. This destructive effect of naphthenic acids (NAP) is enhanced by the presence of hydrogen sulfide generated in thermal decomposition of sulfur compounds also contained in crude oils. The efforts of mitigating the acidic crudes corrosive effects include blending such oils with crudes of lower acids content neutralization or removal of naphthenic acids from oils and the use of corrosion inhibitors. Most commonly used inhibitors for mitigating the NAP corrosion are based on organic polysulfides or on phosphate esters. Two phosphate esters corrosion inhibitors were evaluated in laboratory experiments using a specific testing procedure – “pretreatment - challenge”. This experimental method evaluates the naphthenic corrosive effects at high temperature on scales formed from crude factions on metal surfaces. Adding the inhibitors to the crude fractions improved the protective properties of scales formed under such conditions. The corrosive effect of naphthenic acid was evaluated by sample weight loss. The scales formed on these samples were investigated using scanning electron microscopy (SEM) and transmission electron microscopy (TEM) coupled with energy dispersive spectroscopy (EDS).Keywords: phosphate esters corrosion inhibitors naphthenic acids high temperature

Product Number: 51319-13491-SG
Author: Gheorghe Bota
Publication Date: 2019
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