The N content in pure benzene in the benzene hydrogenation unit is above the specified limit
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I would like to ask for advice regarding the issue of excessive N content in pure benzene in our plant. Since this is a new plant that has just started operating, I’m seeking suggestions from everyone
If the extractant is NFM, it’s possible that the previous solvent undergoes hydrolysis; the water was not removed thoroughly
Consider whether it might be a problem with the hydrogenation unit. It is possible to add devices other than N
Reply to 1# handan1777: Which company does your benzene hydrogenation operation belong to?
If you use N-formylmorpholine, the solvent decomposition can cause the nitrogen content in the product to exceed the specified level; whereas if sulfolane is used, the nitrogen level generally does not exceed the limit. Of course, this also depends on the nitrogen content in the raw materials – if the raw materials contain high levels of nitrogen, pre-treatment is necessary.
Is the hydrogenation of crude benzene harmful to the body?
I suspect it’s a problem with the water in unit 500, but we initially used BT solution to carry the water – will it be fine after operating for a longer time? Please advise
Reply to 7# handan1777: Bringing in water should not cause an increase in nitrogen content, right? It might be a reaction issue. Do you have white clay pots?
You never mentioned what solvent you’re using; it would be helpful to know that so I can assist you with the analysis
Formylmorpholine leads to N-containing compounds, while sulfolane results in S-containing compounds. Since you mentioned that you have just started using these solvents, the problem is likely not related to solvent hydrolysis or aging; it’s more probably related to the operation procedures – specifically, solvent recovery. It’s necessary to control the solvent recovery tower, lower the temperature at the bottom of the tower, and increase the reflux rate appropriately. Furthermore, check the device valves; heating during operation in winter can increase the pressure in some solvent pipelines, leading to internal leakage of the valves and contamination of the product. Ours is sulfolane; we encountered this issue before and it has now been resolved
The solvent used is formamidomethane; I initially also thought it might be a problem with the handling process, which could lead to some hydrolysis occurring