Absorber unit using Selexol solvent

[mikamikomilo]

Hi,

I am doing a simulation of Integrated Gasification combined cycle (IGCC). At one point, i need to use Selexol solvent to remove H2S and CO2. Below are my questions, hope you could kindly help me.

I am wondering is there a maximum pressure difference (between the top & bottom stage) of a typical absorber?
What is the decomposition point/boiling point of Selexol at 50 bar? ( i am running my simulation at 50 bar & 10C, not too sure if Selexol will be decomposed)
What is the typical amount of Selexol used in industry to remove H2S and CO2? ( i am using about 60kgmole/hr of Selexol in my simulation, not sure if it is feasible for this amount)

Thank you so much!

 

[Achy47]

Hello,

Thank you for your questions regarding the use of Selexol solvent in the IGCC process. I am happy to assist you with your inquiries.

To answer your first question, there is no specific maximum pressure difference for the absorber in the IGCC process. The design and operation of the absorber will depend on various factors such as the composition of the gas stream, the desired removal efficiency, and the specific equipment being used. It is important to consider these factors when determining the pressure difference in your simulation.

The decomposition point/boiling point of Selexol at 50 bar and 10°C is approximately 100°C. This means that at these conditions, Selexol will not decompose and will remain in its liquid state. However, it is important to note that the boiling point of Selexol can vary depending on the impurities present in the gas stream. It is recommended to conduct a thorough analysis of the gas stream to accurately determine the boiling point of Selexol in your simulation.

In terms of the typical amount of Selexol used in industry, it can vary depending on the size and capacity of the IGCC plant. However, a general rule of thumb is that for every 1 kg of H2S and CO2 removed, approximately 2-3 kg of Selexol is used. Therefore, for the amount of Selexol you are using in your simulation (60 kgmole/hr), it seems feasible for the removal of H2S and CO2.

I hope this information helps with your simulation. If you have any further questions or concerns, please do not hesitate to reach out. Good luck with your project!