Hello,
I have a basic question regarding the PSA tail gas from a steam reforming process. It is my understanding that this tail gas is 100% recycled back to the reformer furnace as there is a significant amount of unreacted methane in this gas. However, I was under the impression that there is also a significant amount of carbon dioxide in this gas stream. My question is, do reforming processes usually have a unit to separate the methane in this tail gas from CO2 and other gases? If not, why not? If the methane is separated, is this usually done with an amine scrub? Is the CO2 and other waste gases simply vented off? Or is this CO2 commonly used for some othe process? Thank you.
T'ien