The impact of pressure on the ammonia synthesis process
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What is the impact of pressure on the ammonia synthesis process? What is the pressure in large-scale ammonia synthesis processes nowadays? This post was last edited by mingyyan on 2009-2-13 10:26.]
Synthetic ammonia involves multiple processes; which ones are specifically referred to?
Ammonia synthesis is a volume-reducing reaction, and increasing the pressure facilitates the production of ammonia; therefore, increasing pressure is theoretically beneficial for ammonia synthesis. Currently, large ammonia synthesis plants (with an annual production capacity of over 300,000 tons) all use low-pressure ammonia synthesis technology. Low-pressure ammonia synthesis is characterized by stable operation and a long production cycle ； The overall energy consumption is also slightly lower than that of high-pressure ammonia synthesis ； At the same time, through measures such as improving the structure of the internal components and increasing the catalyst loading, the net ammonia yield remains comparable to that of high-pressure ammonia synthesis; the adopted technologies can ensure that the net ammonia yield is greater than 16% (v%).
The ammonia synthesis process consists of several units; it’s not clear which one is being referred to. For desulfurization, the pressure is generally 0.5 MPa, while for shift reaction it is 0.8 MPa; there are also cases where the pressure is 2.1 MPa
The synthesis of ammonia is a reaction that involves a decrease in volume; therefore, increasing the pressure can boost the reaction rate, which is beneficial for this process. The pressure used in large-scale ammonia synthesis is 150 kilograms
Our synthesis tower is a model 1200 with a pressure of 31.4 MPa; it’s probably quite old.