What are the factors that affect the benzene content in pyrolysis gasoline during catalytic cracking operations?
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What are the factors that affect the benzene content in pyrolysis gasoline during catalytic cracking operations?
Of course, it’s the composition of the crude oil. The composition of the crude oil is the decisive factor, that is, the internal factor ； Processing conditions are auxiliary factors, that is, external influences.
Of course, it’s the composition of the crude oil. The composition of the crude oil is the decisive factor, that is, the internal factor ； Processing conditions are auxiliary factors, that is, external influences.
Could you specify which components in the raw materials produce benzene during the cracking process, and through which reactions is benzene formed?
As the slag blending ratio in various refineries increases, the feedstock for catalytic cracking becomes increasingly heavy, resulting in higher levels of total aromatics and benzene in catalytic gasoline. Furthermore, due to the need to increase the production of low-carbon olefins, catalytic cracking units typically operate at higher temperatures, and catalysts or additives containing selective molecular sieves are used; all of these factors can lead to an increase in the levels of benzene and total aromatic hydrocarbons in the catalytic cracking gasoline.
This mechanism cannot be explained clearly in just one or two posts or a few sentences. This is why it is necessary to conduct group composition analysis on catalytic cracking feedstocks. Group composition analysis includes data on aromatic compounds, and the feedstocks contain the basic substances from which aromatics are formed – not only benzene but also related benzene derivatives. It is recommended that you take a look at Mr. Hou Xianglin’s \"China’s Refining Technology\" (2nd edition) and the corresponding sections in Mr. Hou Fusheng’s \"China’s Refining Technology\" (3rd edition).
The slag addition ratio and the properties of the raw materials have a certain impact on the benzene content in gasoline, but the effect is not significant; it is primarily the reaction temperature and the secondary reactions that have a greater influence on the benzene content.