LCO Selective Hydrogenation Process of the LTAG-Ⅱ Technology
To reduce hydrogen consumption in the catalytic hydrogenation process and improve the technical economy,according to the distribution characteristics of aromatics in catalytic cracking diesel oil(Light cycle oil,LCO),LCO feedstocks were fractionated,and then the LCO light fractions and the heavy fractions selectively hydrogenated in the hydrogenation unit were fed into corresponding injection zones of the catalytic cracking unit.The technology for improving quality and efficiency(LTAG-Ⅱ technology)was developed,which can efficiently convert LCO into high octane gasoline or light aromatic hydrocarbons under the premise of reducing hydrogen consumption.By exploring the aromatics distribution law and reaction characteristics of LCO fractions at different fractionation temperatures,it is made clear that acenaphthene,fluorene and their derivatives are the significant factors affecting the selective hydrogenation reaction performance of heavy LCO fractions.The optimal fractionation temperature is determined to be 240 ℃.Under this optimal fractionation temperature,compared with the single/bidirectional combination technology of hydroprocessing-catalytic cracking to produce high-octane gasoline components(LTAG-Ⅰ technology),the hydrogen consumption of LTAG-Ⅱ technology is reduced by 17.7％,the conversion rate of LCO feedstock is increased by 4.76 percentage point,and the gasoline yield and selectivity are improved,demonstrating its good technical and economic performance.
万方数据
维普
