Inlet Gas Separator

The inlet gas separator, or the knockout drum, is the first unit in the Amine Sweetening process. It removes liquids and solids that have the potential to cause upsets downstream. There are several different types of separator commonly used in industry:

Our team of experienced engineers would love to help you to choose the right one or troubleshoot an existing one!



Sulfur Recovery Engineering SRE

The absorber, or contactor, is where the sour gas first comes into contact with the chosen solvent. The process stream is fed counter-currently to the falling amine in order to remove H2S and CO2. Key considerations in column design include:

Flash Drum

In order to reduce hydrocarbons in the acid gas, a flash drum is used to remove any that may have dissolved or been carried over in the amine. Design factors include, operating pressure and the overall size of the unit.


Lean/Rich Exchanger

The lean/rich exchanger helps to recover some of the heat from the lean amine leaving the reboiler and transfer it to the rich amine entering the regenerator. A properly designed exchanger can bring significant cost savings to the plant by decreasing heating and cooling duties of other units. Both shell and tube and plate/frame exchangers are used currently in industry.


Sulfur Recovery Engineering SRE
The regenerator, or stripper, is a trayed or packed column that uses steam to remove over 95% of the acid gas contained in the solvent. Common design and operating parameters are:


To generate stripping steam, the amine solution is heated by a reboiler. The heat is typically provided to the reboiler by LP steam in refinery settings. Reboiler design is important as it also removes some of the acid gas as well as heats the lean solvent.

To ensure that your Reboiler and Regenerator are operating at optimal conditions contact us and our experienced staff would love to help out.


SRE has partnered with Virtual Materials Group (VMG), allowing SRE to use the powerful VMG Plant simulation software in-field (Symmetry® ). Using years of accumulated SRE sulfur unit data, our team is able to accurately model any given Amine Unit to aid in troubleshooting and optimization

Contact us now to learn more about the creation of both Steady-State and Dynamic models of your Amine Unit!