What is the impact of the total amount of ammonia recovered by the OTE high-pressure process (in the form of ammonium methoxide) on the urea synthesis process?
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I would like to ask everyone: The OTE high-pressure process involves returning the by-produced ammonia to the urea production process in the form of ammonium methoxide. My question is: 1. What is the relationship between the amount of ammonium methoxide returned and the requirements of the urea synthesis process?； For a urea production capacity of 520,000 tons per year, what is the maximum production capacity for the ammonium carbamate liquid – the by-product ammonia generated by a melamine plant – that can be processed? 2. To what extent are the production control and metrics of the original urea process affected by the recycled by-product ammonia (ammonium methoxide)? What adverse effects will arise? 3. The ammonium solution that is returned is reused to produce a urea solution with a concentration of over 70%. What is the approximate unit production cost (expressed in terms of urea)? I earnestly request your guidance!
This post was last edited by fjhuyuyang on 2012-1-17 09:49. What are the components of the by-product ammonia (ammonium hydroxide solution)? What are the percentage contents of each component?
1. The relationship between the amount of ammonium solution returning and the urea synthesis process； For a urea production capacity of 520,000 tons per year, what is the maximum production capacity for the ammonium carbamate liquid – the by-product ammonia generated by a melamine plant – that can be processed? That’s a great question! If there is currently 520,000 tons per year of urea, the absorption system needs to be modified so that it can work well with a plant capable of producing about 60,000 tons per year of triamine ； In the case of a newly built 520,000 tons/year urea plant, it is possible to take measures during the design phases for synthesis and absorption to ensure compatibility with a plant capable of producing about 120,000 tons of triamine per year. 2. To what extent are the production control and metrics of the original urea process affected by the recycled by-product ammonia (ammonium methoxide)? What adverse effects will there be? There will definitely be some effects, and it depends on how much headroom was built into the design of your absorption system. Equipment modifications and process adjustments can be used to mitigate the impact of the triamine return liquid as much as possible. Process adjustments involve sending the ammonia solution containing urea to the triamine absorption unit and then returning it to urea, in order to prevent disruption of the equilibrium in the urea production facility. 3. The ammonium solution that is returned is reused to produce a urea solution with a concentration of over 70%. What is the approximate unit production cost (expressed in terms of urea)? It’s hard to evaluate this! My skills are limited; this reply is for reference only!