What is the reason for the high COS content in the carbon dioxide product gas produced by low-temperature methanol washing?
Thread Content
The carbon dioxide recovered from low-temperature methanol washing is mainly used for urea production. Recently, the COS content in the CO2 is high, but the H2S content is low – what is the reason for this? How to solve it?
Increasing the amount of methanol sprayed at the top of the carbon dioxide separation tower should be sufficient
Verify the total amount of COS in the feed gas
The desorbed carbon dioxide is treated in a desulfurization tank; the total sulfur content is generally below 0.05 ppm, which meets the requirements for gas used in subsequent production processes.
There is a desulfurization tower between the CO2 compressor sections, but it can only remove H2S; it has no effect on removing COS.
What is the COS content in the process gas derived from gasification?
This issue requires a specific analysis: what are the levels of H2S and COS in the feed gas for low-temperature methanation? If the current COS level is much higher than the original design, modifications are necessary; adjusting ordinary operating parameters will not solve the problem. Generally, minor modifications are sufficient!