The study of a light cycle oil (LCO) upgrading alternative involving hydrotreating and hydrocracking/transalkylation procedures for obtaining a benzene, toluene and xylene (BTX) enriched fraction is presented. The research work was focused on the effect of the experimental conditions on the hydrocracking of an hydrotreated light cycle oil (HDT LCO) in order to produce the highest amounts of BTX, when the catalysts consisted of a mixture (50/50 in weight) of nickel–molybdenum on alumina (NiMo/Al₂O₃) and ZSM-5 materials (NiMo/ZSM-5 (50)). It was found that 7.4 MPa, up to 375 °C, LHSV of 1.2 h⁻¹ and a H₂/Oil value of 442 m³/m³ were the optimal experimental conditions for producing an enriched BTX fraction (31%). In order to facilitate the analysis, the study was carried out considering four types of hydrocarbons as lumps for the feed and HCK products: light hydrocarbons (LHC) composed by C4–C7 non-aromatic compounds, BTX, middle hydrocarbons (MHC) consisting of C7–C10 paraffins and isoparaffins, alkylbenzenes, tetralin and naphthalene derivatives and a small amount of high molecular weight hydrocarbons (HHC). Based on this description, HDT LCO used as feedstock for the hydrocracking (HCK) procedure, presents a 99% of a MHC fraction. The HCK conversion, BTX selectivity and yields were obtained from the chromatographic analysis of the products. A simple kinetic model considering only the MHC conversion was carried out. The obtained activation energy confirmed the endothermic nature of the HCK process. The activity decay of the catalytic mixture was also studied by varying the time on stream.

中文翻译：

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实验条件对加氢轻循环油形成BTX的影响

提出了一种轻循环油（LCO）升级替代品的研究，该替代品涉及加氢处理和加氢裂化/烷基转移程序，以获得富含苯，甲苯和二甲苯（BTX）的馏分。研究工作集中在实验条件对加氢处理的轻循环油（HDT LCO）的加氢裂化的影响上，以产生最高量的BTX（当催化剂由50％重量比为50/50的混合物组成）时。氧化铝上的镍钼（NiMo / Al ₂ O ₃）和ZSM-5材料（NiMo / ZSM-5（50））。结果发现，在高达375°C的条件下为7.4 MPa，LHSV为1.2 h ^-1，H ₂ /油值为442 m ³ / m ^3。是生产丰富的BTX馏分（31％）的最佳实验条件。为了便于分析，该研究考虑了四种类型的烃作为饲料和HCK产品的结块：由C4–C7非芳族化合物组成的轻烃（LHC），BTX，由以下物质组成的中间烃（MHC）： C7–C10链烷烃和异链烷烃，烷基苯，四氢萘和萘衍生物以及少量的高分子量烃（HHC）。基于此描述，用作加氢裂化（HCK）程序原料的HDT LCO占MHC馏分的99％。从产物的色谱分析获得HCK转化率，BTX选择性和产率。进行了仅考虑MHC转化的简单动力学模型。所获得的活化能证实了HCK过程的吸热性质。还通过改变生产时间来研究催化混合物的活性衰减。