SAFE Syngas Associates FE LLC

NG, reformed gas or other syngas usually contains CO2 which shall be removed, most probably with water, before  the gas can be further used or sold. Traditionally, the word 'CO2 removal' (or "DeCO2") is used in the purification section of hydrogen stream in ammonia plant because syngas has already been desulfurized prior to entering DeCO2 unit in ammonia plant. On the other hand, the word 'acid gas removal (or "AGR")' or 'gas sweetening' is often used if feed gas further contains sulfur components such as H2S, COS, CS2 or mercaptanes ("RSH") etc. which shall be removed simultaneously or anyhow separately. Therefore DeCO2 processes are parts of AGR processes.

In this website, AGR processes are reviewed with a note whether each AGR process can be applicable as DeCO2 or not.

AGR pocesses are usually divided into four (4) methods; namely, 'gas absorption', 'direct conversion', 'adsorption' and 'membrane' as follows. Please click the corresponding button to look at the processes of each method respectively.