Energy Risk Engineering Insights

Let’s discuss TAN in a refinery operation.

TAN stands for Total Acid Number, and it is an important parameter in refinery operations. The Total Acid Number measures the acidic constituents present in a petroleum product or crude oil. It indicates the amount of acidic compounds, such as organic acids and sulfuric acid, in the sample.

In a refinery operation, monitoring the TAN is crucial for several reasons:

1. Corrosion Control: High TAN values indicate the presence of acidic compounds, which can cause corrosion in refinery equipment and pipelines. By monitoring TAN, refinery operators can take preventive measures to mitigate corrosion, such as using corrosion inhibitors or adjusting process conditions.
2. Catalyst Activity: TAN can affect the performance and lifespan of catalysts used in refining processes. Acidic compounds can deactivate catalysts or lead to undesirable reactions. By monitoring TAN, refinery operators can optimize catalyst usage and predict catalyst replacement schedules.
3. Product Quality: TAN is also an essential parameter for assessing the quality of refined products. High TAN values in finished products can lead to performance issues or damage to downstream equipment. Monitoring TAN helps ensure that products meet the required specifications and maintain their integrity during storage and transportation.

To measure TAN, various analytical methods are available, including ASTM D974, ASTM D664, and ASTM D664/IP177. These methods involve titration with a base to determine the acid concentration in the sample.

In summary, monitoring Total Acid Number (TAN) in refinery operations is crucial for corrosion control, catalyst performance, and product quality. By understanding the TAN levels, refinery operators can optimize their processes, ensure equipment integrity, and maintain product specifications.