Chemicals Used for Removing Dissolved Oxygen: Techniques and Applications

Introduction

The removal of dissolved oxygen from various water and oil-field applications is crucial for preventing corrosive damage and ensuring the efficiency of industrial processes. This article explores the commonly used chemicals and techniques for this purpose, focusing on their applications in different settings.

Chemicals for Dissolved Oxygen Removal in Oil-Field Waters

One of the most common methods for removing dissolved oxygen from oil-field waters involves the addition of chemicals such as sulfur dioxide or sodium sulfite. These chemicals are preferred because they require minimal capital investment. This simplicity in application makes them a popular choice in the industry.

Application of Hydrazine and Sodium Sulfite

The selection of the chemical for oxygen removal can vary based on the pressure conditions. In high-pressure boiler systems, hydrazine is often used due to its high efficiency and reliability. In contrast, sodium sulfite is more suitable for lower pressure boiler systems. The choice of these chemicals ensures optimal performance and cost-effectiveness, making them indispensable in industrial processes.

Alternative Methods for Oxygen Removal

Beyond chemical treatments, there are several alternative methods that can be employed for oxygen removal. One such method involves boiling the water under 1 atmosphere (atm) pressure, which can effectively reduce oxygen content but may require significant energy input.

A more efficient approach is to boil the water under reduced pressure. This technique not only reduces the solubility of oxygen but also minimizes energy consumption, making it a preferred option in many industrial settings. Additionally, purging the water with nitrogen can be an effective method, especially in applications where traditional chemical treatments are not feasible.

Nitrogen as an Oxygen Remove Agent

Nitrogen, a non-reactive and inert gas, is another common method for removing dissolved oxygen. The process involves bringing the water to a reduced pressure and then purging it with nitrogen. This approach is particularly beneficial in situations where the presence of trace amounts of oxygen can significantly affect the quality of the water or the efficiency of the process.

Conclusion

In conclusion, the removal of dissolved oxygen is essential for maintaining the integrity and efficiency of industrial processes, particularly in oil-field operations and boiler systems. The choice of chemical or method depends on the specific application and operational parameters. Whether it is through chemical treatment with sulfur dioxide or sodium sulfite, or the use of nitrogen purging, the goal is always to ensure a stable and corrosion-free environment.