Distribution of olefins, aromatics, and sulfur in catalytic cracking gasoline
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What are the distribution patterns of olefins, aromatics, and sulfur in catalytic cracking gasoline?
The distribution of olefins, aromatics, and sulfur in catalytic cracking gasoline is closely related to the feedstock and catalyst properties, but certain patterns can be observed. 1. Olefins are primarily present in the fractions below 110°C; thereafter, as the boiling point increases, their concentration drops sharply ； Alkanes and alkenes are mainly distributed in the C5-C8 range, with C5 being the most common. 2. Aromatics are primarily present in the fraction ranging from 170–205°C; their concentration increases as the boiling point rises ； Aromatic hydrocarbons are mainly distributed in the C7-C11 range, with C8 and C9 being the most common. 3. About 5% of the sulfur in the raw materials ends up in the gasoline component, and the sulfur content in gasoline increases as the boiling point rises.
This is related to the reaction raw materials as well as the degree of reaction; the moderator covered this quite comprehensively. Olefins are present in the C5-C8 range, while sulfur is mainly found in the C8-C12 range. As the dry point changes, the total amount of sulfur changes significantly
Olefins in catalytic cracking gasoline: C5 olefins account for 40%, C6 olefins for 20%, C7 olefins for about 20%, while those with carbon numbers above C8 and C4 together make up 10%. Sulfur is very low below 80 or 90 degrees, rises between 90 and 180 degrees but remains stable, following a straight line parallel to the X-axis; it increases sharply above 180 degrees. About 80% of S is concentrated in the fractions above 160 degrees. Aromatics are only present in the fractions above 155 degrees. The 140-155 fraction of catalytic gasoline has the lowest RON.
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