Ammonium Bisulfite Oxygen Scavenger

Oxygen Treatment scavenger is a class of chemicals added to react and remove oxygen in water to protect against oxygen induced corrosion. The use of Ammonium Bisulfite  as a chemical deoxygenator is economical within certain limitations imposed by the dissolved oxygen content. Ammonium Bisulfite is relied on as the sole means of oxygen removal. Generally, costs are balanced by removal of as much of the oxygen as feasible by mechanical means, e.g. deaerator and by using Ammonium Bisulfite to react with the residual oxygen.

To prevent corrosion and pitting it is desirable to feed the Ammonium Bisulfite.

Theoretically, 7.88 pounds of RXSOL-81-6119-220 are required to remove one pound of oxygen. The efficiency of the oxygen removal is estimated at 75 per cent to allow for oxidation in contact with air, blowdown losses, etc. Therefore it is estimated that 10 pounds of RXSOL-81-6119-220 are required for each pound of oxygen removed (or 10 ppm RXSOL-40-5023-210 per 1 ppm dissolved oxygen.)
 

Uses

Ammonium Bisulfite Oxygen Scavenger is suitable for use in:

• Oilfield water injection systems
• Seawater injection systems
• Produced-water treatment systems
• Waterflood operations
• Oil and gas production facilities
• Injection pipelines and flowlines
• Deaerated water systems
• Closed-loop industrial water systems
• Process-water systems
• Hydrotest and preservation water, where chemically appropriate
• Storage and transfer systems requiring dissolved-oxygen control
• Corrosion-control programs where oxygen removal is an essential part of the treatment strategy

PHYSICAL AND CHEMICAL PROPERTIES

Application

Ammonium Bisulfite Oxygen Scavenger is normally applied by continuous chemical injection into the water stream at a point that provides adequate mixing and sufficient contact time before the water reaches oxygen-sensitive equipment.

The required dosage depends primarily on:

• Dissolved oxygen concentration
• Water flow rate
• Temperature and pH
• Required residual sulfite/bisulfite
• Contact time
• Presence of other oxidizing substances
• System operating conditions

For best results, dissolved oxygen should be monitored before and after treatment, and the chemical feed rate adjusted accordingly. A slight excess over the theoretical oxygen demand is generally maintained to provide a scavenger residual and compensate for oxygen ingress downstream.

The product may be injected neat or suitably diluted with compatible water, depending on the dosing equipment and operating requirements.