Synthetic ammonia
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1. Why is a decarburization step necessary in ammonia synthesis? What is the fundamental difference between physical absorption and chemical absorption in decarbonization methods? In what situations are they applicable respectively? In which ammonia synthesis processes are the hot potassium carbonate method and the low-temperature methanol washing method applicable respectively? 2. Why is natural gas steam reforming divided into two stages? What elements should be included in the process flow of the natural gas steam reforming unit? 3. Why is the venting point in the ammonia synthesis cycle placed before fresh gas supplementation? Taking the ammonia synthesis process using natural gas as a raw material as an example, from which process parameter in which stage should efforts be made to reduce the amount of air released? Could an expert explain this to me? I’ve just started learning about *ammonia synthesis
It is recommended that the original poster systematically study the basic process knowledge of ammonia synthesis. 1. During the ammonia synthesis process, the gas after conversion typically contains 18%-35% carbon dioxide, which not only poisons the ammonia synthesis catalyst but also makes it difficult to remove small amounts of carbon monoxide. 3. The air release point in the ammonia synthesis cycle is located before fresh gas is introduced, in order to reduce the loss of useful gases in the fresh gas.
Decarburization not only serves to purify gases but also provides a raw material for urea.