加氢LCO催化裂化反应过程中芳烃转化规律分析

基于催化裂化轻循环油（LCO）选择性加氢-催化裂化集成生产轻质芳烃（LTA）技术在中国石化某分公司的工业应用结果，从烃类分子水平对加氢LCO催化裂化反应过程中芳烃转化规律进行分析。结果表明：加氢LCO发生催化裂化反应后，分子膨胀比为2.11，其中链状烃含量增加，环烷烃含量降低，单环芳烃含量降低，稠环芳烃含量增加；催化裂化产物中的单环芳烃73.91%来自加氢LCO中单环芳烃上烷基和环烃基的裂化、轻质化反应，其余来自加氢LCO中非芳烃类化合物的环化和芳构化反应；催化裂化产物中双环、三环及三环以上芳烃（包括焦炭）来自加氢LCO中双环、三环芳烃的比例分别为37.77%和18.49%，其余分别来自加氢LCO中单环、双环芳烃的稠环化反应；加氢LCO中烷基苯、茚满类+四氢萘类和茚类的催化裂化表观转化率分别为82.50%，93.80%，80.72%。研究结果对LTA工艺技术的改进和专用催化剂的性能提升具有指导作用。

STUDY OF AROMATICS CONVERSION RULES IN HYDROTREATED LCO CATALYTIC CRACKING

Based on the commercial result of LTA technology in a refinery of SINOPEC，the conversion rules of the aromatics in hydrotreated LCO（hydro-LCO）catalytic cracking were studied in terms of molecular-based hydrocarbon. The results showed that 73.91% of monocyclic aromatics in products was from cracking reaction of the monocyclic aromatics like alkyl-benzene and naphthenic-benzene in hydro-LCO，and the rest was from the aromatization reactions of non-aromatic compounds including paraffin hydrocarbons and naphthenic hydrocarbons in hydro-LCO in the catalytic cracking process. The contents of dicyclic-aromatics and tricyclic and polycyclic aromatics in products were 37.77% and 18.49%, respectively, and the rests were made up from condensation reactions of monocyclic aromatics and dicyclic aromatics in hydro-LCO. The apparent conversions of alkyl-benzene，hydrocarbons like indane and tetraline and hydrocarbons like indene in catalytic cracking processing were 82.50%，93.80% and 80.72%, respectively. The results can be used to guide the further improvement of LTA technology and proprietary catalyst.