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Impact of Unreacted Mea-Triazine on Refinery Operation

Picture for Properties Of Unreacted MEA-Triazine Contamination In Crude Oil
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Product Number: 51321-16832-SG
Author: James Ondyak; James Noland; Parag Shah
Publication Date: 2021
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When oil producers or shippers treat for H2S removal, the market share leading chemistry is MEAtriazine.
The reaction to capture H2S generates monoethanolamine (MEA) as a byproduct and also requires a stoichiometric excess of MEA-triazine to control H2S to the desired level. The presence of a stoichiometric excess causes MEA-triazine contamination in the crude. This paper provides new information on the impact of unreacted MEA-triazine on the risk of overhead corrosion in the crude unit. The conclusion is that unreacted MEA-triazine is a contaminant of significant concern.
Distillation studies on crude spiked with MEA-triazine provide insight on amine generation that results from thermal decomposition of MEA-triazine at crude column conditions. Extraction studies of MEAtriazine and MEA provide insight into the difficulty of removing these contaminants in the desalter.
The concentration of these contaminants in the desalted crude cannot be measured accurately enough for controlling the risk of overhead corrosion, and desalting efficiency based on salt removal is not a reliable predictor of protection from MEA or from unreacted MEA-triazine in the crude. New monitoring and desalting solutions are presented to improve the ability of the refinery to protect against continuous or intermittent presence of MEA-triazine and MEA in the crude.

When oil producers or shippers treat for H2S removal, the market share leading chemistry is MEAtriazine.
The reaction to capture H2S generates monoethanolamine (MEA) as a byproduct and also requires a stoichiometric excess of MEA-triazine to control H2S to the desired level. The presence of a stoichiometric excess causes MEA-triazine contamination in the crude. This paper provides new information on the impact of unreacted MEA-triazine on the risk of overhead corrosion in the crude unit. The conclusion is that unreacted MEA-triazine is a contaminant of significant concern.
Distillation studies on crude spiked with MEA-triazine provide insight on amine generation that results from thermal decomposition of MEA-triazine at crude column conditions. Extraction studies of MEAtriazine and MEA provide insight into the difficulty of removing these contaminants in the desalter.
The concentration of these contaminants in the desalted crude cannot be measured accurately enough for controlling the risk of overhead corrosion, and desalting efficiency based on salt removal is not a reliable predictor of protection from MEA or from unreacted MEA-triazine in the crude. New monitoring and desalting solutions are presented to improve the ability of the refinery to protect against continuous or intermittent presence of MEA-triazine and MEA in the crude.

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