Abstract
In the absence of adequate volume of aqueous phase in crude sample, it is a challenge to determine the corrosion inhibitor residuals concentration by conventional techniques. This work aims to solve this problem by providing an analytical technique to measure the corrosion inhibitor residuals in dry crude oil by extracting corrosion inhibitor residuals from crude oil into a saline water, which could be then quantified by any analytical instrumental means.
A method was developed for the extraction of corrosion inhibitor residuals from treated crude oil samples by saline water. The various method development parameters were carefully studied and compared to get the optimum conditions for separation and quantification. The method provides a solution for a problem that exists, which is the difficulties to determine corrosion inhibitor residuals from a dry crude oil that has no sufficient associated water.
In this work, all extraction conditions were studied and optimized such as extraction temperature, extraction time, and water salinity. Equal portions of treated oil spiked with corrosion inhibitor and saline water were mixed together at different temperature for different extraction time. Extraction efficiency at different water salinity were studied as well. The concentration of the extracted corrosion inhibitor was determined by an analytical instrumentation applying chromatographic technique.
It was found that the corrosion inhibitor residuals are best extracted if the water salinity is 1% at heating temperature of 50°C for one hour. The higher the salinity of the water, the less extraction yield was observed.
