Differences in product specifications between cracked C9 and hydrogenated C9, as well as their downstream application areas

Pyrolyzed C9 is a by-product of steam cracking naphtha, with a complex and diverse composition: it contains a high level of olefins, as well as about 100–300 ppm of sulfur and small amounts of nitrogen. I. Using pyrolyzed C9 as a raw material for resins 1) Currently, pyrolyzed C9 is mainly used in the production of petroleum resins ； C9 obtained from the pyrolysis of raw materials can be converted into C9 cold/polymerized resins through weight removal followed by cold/polymerization. 2) The cracked C9 is separated; after isolating methyldibenzene and dicyclopentadiene, the indene fraction is used to produce cold-polymerized resins or DCPD-modified resins. Bicyclic compounds can be used as additives or raw materials for resins or other products, such as in the production of ethylenedecynylbenzene. II. Hydrogenation of C9: 1) After deprotonation of cracked C9, hydrogenation is carried out at both ends; saturated olefins as well as sulfur, nitrogen, and oxygen are removed, resulting in a water-white product. This product is used as a component in high-octane gasoline when its dry point is kept below 210 degrees and its sulfur content is below 5 ppm. 2) After dehulling the cracked C9, hydrogenation is carried out at both ends; saturated olefins as well as sulfur, nitrogen, and oxygen are removed, and the hydrogenated product is then divided into products such as mixed xylene, mixed trimethylbenzene, mixed tetramethylbenzene, and heavy aromatics.

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