Reasons for the presence of ammonia in catalytic dry gas
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The catalytic dry gas from the current analysis unit contains ammonia; it is understood that catalytic cracking itself does not produce ammonia. Experts, what gaseous streams are currently being fed into the inlet of the rich gas compressor in the catalytic unit? Could these gas phases carry ammonia? For example, in front of our catalyst unit we have: acidic gases from hydrogenation, normal vent gases, reforming light fraction gases, reformation light components, etc. Can these carry alkaline substances such as ammonia?
When using instruments for qualitative analysis, ammonia is often present in the overhead gas, and it is also present in the catalytic dry gas; however, it is not clear at which stage it is generated. Theoretically, catalytic dry gas should not contain ammonia.
Reformation in the contact unit is carried out using ammonia for cooling; could there be a problem with your ammonia compressor, such as sand holes in the tubes, leading to ammonia leaks that cause the light components from the reformation process to enter your system?
From a process perspective, reformation comes after catalysis, and generally there is no further catalytic step.
This post was last edited by karamay on 2017-6-1 15:06. NH3 must be produced during the reaction process. It’s hard to imagine ammonia being detectable in the dry gas; it should all be dissolved in the condensate at the top of the distillation tower.
This post was last edited by humin on 2017-6-3 07:05. In most cases, the nitrogen in the raw materials is converted into ammonia during the reaction process. During the catalyst coking process, nitrogen in the coke generates ammonia in the early stages of coking, and ammonia is also a precursor to NOx. This is particularly evident in the case of incomplete regeneration processes, as ammonia can be detected in the regenerated flue gas. A portion of the ammonia is carried into the reaction gas stream by the regenerated catalyst.
This post was last edited by humin on 2017-6-3 at 10:00. It is recommended to measure the specific ammonia content in the reaction gas, enriched gas, and dry gas in separate segments, in order to further analyze the source of ammonia. Also, could ammonia be introduced during the processing of external gases?
Hydrogenated acidic gas contains ammonia; this is something that requires attention, as it is highly likely that ammonia will be carried along with the hydrogenated acidic gas.
Could you provide the testing methods or standards?