Effect of pre-oxidation on the rate of formation of sulfur-containing aromatic compounds during vacuum gas oil thermal cracking

IF 5.8 2区化学 Q1 CHEMISTRY, ANALYTICAL

Journal of Analytical and Applied Pyrolysis Pub Date : 2024-10-01 DOI:10.1016/j.jaap.2024.106798

Yulia A. Sviridenko, Nikita N. Sviridenko, Evgenii B. Krivtsov

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Abstract

It was shown that oxidation followed by heat treatment is an effective method for desulfurization of vacuum gas oil. Patterns of changes in the quantitative content of the thiophene series compounds in liquid cracking products of vacuum gas oil and liquid cracking products of pre-oxidized vacuum gas oil are described. A mixture of hydrogen peroxide and formic acid (molar ratio 3:4) was used as the oxidation system. The hypothetical mechanism for the formation of thiophene, benzo- and dibenzothiophene and their homologues from high-molecular weight components of the initial vacuum gas oil and its oxidation products is proposed. Presumably, main path of formation considerate compounds is thermal decomposition of high-molecular weight sulfur-containing components. On the basis of IR spectroscopy and structure-group analysis data, the averaged structures of such components were constructed. The influence of pre-oxidation and its conditions on the value of the rate constants for the formation of thiophene, benzo- and dibenzothiophene and their homologues during thermal cracking of initial and oxidized vacuum gas oils is studied.

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预氧化对真空气油热裂解过程中含硫芳香化合物形成速度的影响

研究表明，先氧化后热处理是一种有效的真空瓦斯油脱硫方法。研究描述了真空瓦斯油液体裂解产物和预氧化真空瓦斯油液体裂解产物中噻吩系列化合物的定量含量变化规律。过氧化氢和甲酸（摩尔比为 3:4）的混合物被用作氧化体系。提出了从初始真空瓦斯油的高分子量成分及其氧化产物中生成噻吩、苯并噻吩和二苯并噻吩及其同系物的假设机理。据推测，形成此类化合物的主要途径是高分子量含硫成分的热分解。根据红外光谱和结构群分析数据，构建了此类成分的平均结构。研究了在初始和氧化真空气体油的热裂解过程中，预氧化及其条件对形成噻吩、苯并噻吩和二苯并噻吩及其同系物的速率常数值的影响。

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来源期刊

Journal of Analytical and Applied Pyrolysis 化学-分析化学

CiteScore

9.10

自引率

11.70%

发文量

340

审稿时长

44 days

期刊介绍： The Journal of Analytical and Applied Pyrolysis (JAAP) is devoted to the publication of papers dealing with innovative applications of pyrolysis processes, the characterization of products related to pyrolysis reactions, and investigations of reaction mechanism. To be considered by JAAP, a manuscript should present significant progress in these topics. The novelty must be satisfactorily argued in the cover letter. A manuscript with a cover letter to the editor not addressing the novelty is likely to be rejected without review.