高硫真空汽油氧化产物裂化过程中噻吩衍生物的形成及破坏动力学规律

IF 0.6 4区 工程技术 Q4 ENGINEERING, CHEMICAL
E. B. Krivtsov, A. V. Goncharov, Yu. A. Sviridenko, M. I. Merzhigot
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引用次数: 0

摘要

介绍了新古比舍夫斯克炼油厂高硫真空汽油在不同条件下裂解产物组成的研究结果。建立了真空汽油液体裂化产物、氧化汽油液体裂化产物及其非极性部分和极性部分经液相吸附色谱分离后硫的定量含量。结果表明,在高硫真空汽油热裂化过程中,硫几乎没有从液体产品的组成中去除。噻吩、苯并噻吩和二苯并噻吩的衍生物集中形成和积累,使所得馏分的质量恶化。预氧化降低了高分子量含硫组分的热稳定性,而这些组分在常规热处理过程中是稳定的。预氧化可显著减缓液体裂化产物中低分子量芳香族硫化合物的积累。因此,含硫组分既发生缩合反应成焦炭,又随着气态硫化合物(硫化氢和低硫醇)的形成而破坏,这有助于增加硫的去除程度。对氧化真空汽油液相裂解产物的色谱分析表明,在此条件下,未观察到新生成的噻吩衍生物的降解过程。真空汽油氧化的非极性和极性产品的单独热处理可以通过消除组分之间的侧相互作用来最大限度地减少气体形成反应的发生。结果表明,在非极性产物的裂解过程中,得到的馏分油中芳香族硫化合物(噻吩衍生物)的形成和积累发生,而液体产物组成中的硫含量实际上并没有降低。极性产物的裂解导致气体和焦炭的强烈生成,液体产物组成中的硫含量降低了三倍,产物中以噻吩和苯并噻吩的同系物为主。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Formation of Thiophene Derivatives and Destruction Kinetic Regularities during the Cracking Process of High-Sulfur Vacuum Gasoil Oxidation Products

Formation of Thiophene Derivatives and Destruction Kinetic Regularities during the Cracking Process of High-Sulfur Vacuum Gasoil Oxidation Products

The results of a study of the composition of cracking products of high-sulfur vacuum gasoil from the Novokuibyshevsk Refinery under various conditions are presented. The quantitative content of sulfur in the liquid cracking products of vacuum gasoil, as well as in the liquid cracking products of oxidized gasoil and its non-polar and polar parts after separation by liquid-adsorption chromatography, is established. It is shown that in the process of thermal cracking of high-sulfur vacuum gasoil, sulfur is practically not removed from the composition of the liquid products. Derivatives of thiophene and benzo- and dibenzothiophene are intensively formed and accumulated, which worsens the quality of the obtained distillate fractions. Pre-oxidation reduces the thermal stability of the high-molecular-weight sulfur-containing components that are stable during conventional heat treatment. Pre-oxidation significantly slows down the accumulation of low-molecular-weight aromatic sulfur compounds in the liquid cracking products. As a result, sulfur-containing components both undergo condensation reactions into coke and destruct with the formation of gaseous sulfur compounds (hydrogen sulfide and lower mercaptans), which contributes to an increase in the degree of sulfur removal. Chromatographic analysis of the liquid cracking products of oxidized vacuum gasoil shows that under such conditions, no degradation processes of newly formed thiophene derivatives are observed. Separate heat treatment of non-polar and polar products of vacuum gasoil oxidation allows minimizing the occurrence of gas formation reactions by eliminating side interactions between the components. It is shown that the formation and accumulation of aromatic sulfur compounds (thiophene derivatives) in the obtained distillates occurs during the cracking of non-polar products, while the sulfur content in the composition of the liquid products practically does not decrease. Cracking of polar products leads to intense gas and coke formation, the sulfur content in the composition of liquid products decreases threefold, and thiophene and benzothiophene homologues predominate in the products.

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来源期刊
CiteScore
1.20
自引率
25.00%
发文量
70
审稿时长
24 months
期刊介绍: Theoretical Foundations of Chemical Engineering is a comprehensive journal covering all aspects of theoretical and applied research in chemical engineering, including transport phenomena; surface phenomena; processes of mixture separation; theory and methods of chemical reactor design; combined processes and multifunctional reactors; hydromechanic, thermal, diffusion, and chemical processes and apparatus, membrane processes and reactors; biotechnology; dispersed systems; nanotechnologies; process intensification; information modeling and analysis; energy- and resource-saving processes; environmentally clean processes and technologies.
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