Technology

Pygas first enters the Gasoline Hydrogenation Unit, which hydrogenates the double-bond Compounds in the high-purity Feedstock to make Saturated Compounds, and removes Sulfur Compounds and turn them into Feedstock suitable for the Extraction Unit. It sends the Hydrogenated Heart Cut mixed C6~C8 to the Extraction Unit, and Raw-C5 is used as Feedstock for the C5 plant, whereas C9+ is used as Feedstock for the Hydrodealkylation Unit (HDA). The Extraction Unit selectively extracts Aromatic Compounds from the C6~C8 Hart Cut, that dissolve well in Sulfolane. The extracted Aromatic Compounds are sent to the Fractionation Unit. The Hydrodealkylation Unit turns the C9+ mixture fractionated in the Hydrogenation Unit into a Benzene-rich Aromatic Mixture through Hydrocracking and Hydrodealkylation. The Fractionation Unit uses the difference in boiling points of Aromatic Mixtures coming from the Extraction Unit and Hydrodealkylation Unit to produce high-purity Benzene, Toluene and Xylene.