Heat Stable Salt Removal
MPR Services patended HSSX® Process is an ion exchange system that utilizes MPR's Vesalt® resin.Heat stable salts (HSS) are formed in amine systems as a result of trace compounds produced during normal refining activities entering the amine system along with the acid gasses (H2S and/or CO2). These trace compounds react with the amine to form a salt which cannot be regenerated (released from the amine) by the use of heat in the Regenerator. If allowed to continuously build up, the salts cause the following problems:
- Loss of acid gas absorption capacity
- A change in the vapor liquid equilibrium in the top of the absorber
- Amine system instability
- Large amine losses
- Increased amine replacement and make-up
HSSX® Process is the only ion exchange process that utilizes MPR's Versalt Resin. This process has successfully removed heat stable salts and degradation products from all alkanolamines used in gas processing, including MEA, DEA, MDEA, DIPA, Sulfinol™, FLEXSORB, DGA™ and proprietary and formulated amines.
The HSSX® Process has cleaned amine in refineries, gas plants, ammonia plants and synthesis gas plants. The HSSX® Process can remove cations and/or anions and converts many amine degradation products including formamides, amino acids (bicines) and oxazolidones from amines. This process recovers the amine from the degradation products and returns high performance, free amine to the system.
Additionally, removing and controlling the level of HSS not only maintains the necessary molarity to maintain system capacity and capability, but also reduces corrosion and related operating instability. The corrosion problems common in amine systems are often directly related to the level of HSS in the amine solution. Conoco and MPR have completed in-depth corrosion studies involving MEA, DEA, MDEA, DIPA, Sulfinol, FLEXSORB and DGA. The study indicated that the following mechanism is at work. The heat stable salts interfere with the normally occurring FeS passivation of the carbon steel. Removing the HSS and maintaining them at low levels not only reduces corrosion and the fouling caused by FeS but also reduces operational upsets.
Benefits of the HSSX® Service:
- Removes heat stable salts
- Removes Cations and Anions
- Removes amino acids including Bicine
- Removes Sodium and Potassium
- Removes heavy metals such as nickel and strontium