What are the approximate components of the recycled hydrogen used in ammonia synthesis? How much of that is CO2?
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Gentlemen, what are the approximate components of the recycled hydrogen used in ammonia synthesis? Is it normal to have CO2 levels of over 600 ppm?
Gas composition of the circulating gas: H2, NH3, N2, CH4, Ar; trace amounts of oil and water may also be present. The trace amounts of CO and CO2 in the gas entering the tower come from the make-up gas, and generally, CO + CO2 is kept under control
I really thought you were producing methanol, with such high levels of CO2. Can the synthetic catalyst withstand it? The hydrogen content in the recycled gas is generally best kept at 55%-60%
I don’t know about the other aspects; in our factory, the level of CO + CO2 must be less than 50PPM. If it’s between 50PPM and 80PPM, measures need to be taken to reduce it. If it exceeds 80PPM, the plant has to stop operating. This is related to the catalyst used!
CO2 and CO come from make-up gas; they are strictly controlled parameters, and our plant controls CO + CO2
The circulating gas mainly consists of hydrogen, nitrogen, ammonia, methane, and argon. Our factory controls CO+CO2
Regardless of the catalyst used, in ammonia synthesis, a level of CO+CO2 higher than 10 ppm is unacceptable; if it exceeds 40 ppm, the process must be stopped to prevent catalyst poisoning! !
In the case of ammonia synthesis, a level of 600 ppm is extremely high – the ammonia synthesis reaction simply cannot take place under such conditions. Our online analyzers have a maximum measurement range of only 100 ppm; therefore, there must be an issue with the analysis or the instruments themselves.
CO + CO2 must be controlled in the fresh gas
Ammonia synthesis catalysts generally require CO+CO2
Gas composition of the circulating gas: H2, NH3, N2, CH4, Ar; CO+CO2 is controlled