What is the requirement for nitrogen content in the catalytic feed?
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What is the maximum allowable nitrogen content for the catalytic feed? According to Chen Junwu’s book \"Catalytic Cracking Processes and Engineering,\" if the value is greater than 0.3%–0.4%, restrictions should be applied. That is 3,000 ppm to 4,000 ppm – isn’t that an excessive amount? It has a severe impact on the acidic sites of the catalyst.
It is best to be less than 1000PPm.
Crude oil is classified based on its nitrogen content: less than 0.25% is considered low-nitrogen, while 0.25% or more is considered high-nitrogen. High-nitrogen feedstocks have an impact on catalysts, equipment scaling, product quality, and environmental pollution.
Catalytic cracking catalysts are acidic; therefore, the content of basic nitrogen in the feedstock has an impact on the catalyst’s activity, and substances such as coker wax oil need to be restricted. The general nitrogen content is not a major constraint, but there seems to be a certain relationship between the nitrogen content in the raw materials and the alkaline nitrogen content.
Mm! That makes sense! Further research shows that the content of basic nitrogen in crude oil accounts for 25%–30% of the total nitrogen content. There is no such pattern between basic nitrogen and total nitrogen in the light fractions of crude oil; however, the relationship between basic nitrogen and total nitrogen in residue oil generally conforms to the aforementioned pattern!