第二代LTAG技术开发

为进一步提高汽油辛烷值并降低氢耗，通过色 质联用技术与实沸点切割分析相结合的方法研究催化裂化轻循环油(LCO)轻、重馏分切割方案，并进一步考察LCO不同馏分的加氢和裂化性能；开发了LCO轻、重馏分切割后LCO轻馏分直接催化裂化回炼而LCO重馏分定向加氢后再回炼的第二代LTAG技术(LTAG-Ⅱ)。工业应用结果表明：第二代LTAG技术LCO轻馏分与加氢后的LCO重馏分催化裂化回炼的表观转化率达到74.12%，汽油+液化气表观选择性达到88.00%；与LCO全馏分加氢回炼的第一代LTAG技术相比，汽油研究法辛烷值(RON)、马达法辛烷值(MON)分别提高0.6、0.7个单位，且LCO加氢的氢耗降低22.70%，经济效益显著。

Development and Industrial Application of Second-Generation LTAG Technology

To further improve gasoline octane number and reduce hydrogen consumption, changing cut points of catalytic cracking light cycle oil (LCO) light fraction and heavy fraction was studied through combination of gas chromatography-mass spectrometry (GC-MS) and real boiling point analysis. Both hydrogenation performance and cracking activity of different LCO fractions were investigated. Based on the above work, the second generation LTAG (LTAG-Ⅱ) technology was developed. For LTAG-Ⅱ process, LCO light fraction is directly recycled for further catalytic cracking. However, for LCO heavy fraction, it will be further reprocessed after selective hydrogenation. LTAG-Ⅱcommercial application shows, for LCO light fraction and hydrocracked heavy fractions, catalytic cracking apparent conversion can be 74.12%; gasoline and liquefied petroleum gas (LPG) selectivity can be 88.00%. Compared with the first generation LTAG technology (i.e., LCO full fraction hydrotreating), gasoline research octane number (RON) and motor octane number (MON) can increase 0.6 and 0.7, respectively. In addition, hydrogen consumption ratio can be reduced 22.70%. Therefore, LTAG-Ⅱ process has demonstrated significant economic benefit.