Deep Hydrotreatment of Coal-Derived Liquid by Denitrogenation Pretreatment

IF 0.8 4区工程技术 Q4 CHEMISTRY, MULTIDISCIPLINARY Solid Fuel Chemistry Pub Date : 2024-01-15 DOI:10.3103/S0361521923070078

J. Narangerel, A. Ariunaa, O. Nasantogtokh, E. Puntsagdash

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Abstract

The combination of denitrogenation pretreatment and deep hydrotreatment was examined to produce clean transportation fuel from nitrogen-rich coal liquid. Heavier fraction (recovery yield; 13.1 wt%) of coal liquid was separated by distillation and denitrogenated by extractions with CuCl₂ · 2H₂O, sulfuric acid, furfural and their combinations. Effectiveness of the treatments for nitrogen reduction was increased as following; H₂SO₄ (48.0%) < CuCl₂ ⋅ 2H₂O (75.0%) < furfural (80.0%) < H₂SO₄/furfural (85.0%) < CuCl₂ ⋅ 2H₂O/furfural (92.0%). The hydrotreatment tests using a batch-type autoclave showed that the hydrodenitrogenation of the heavier oil was promoted by the denitrogenation pretreatment with an order of furfural < H₂SO₄ < CuCl₂ ⋅ 2H₂O < H₂SO₄/furfural < CuCl₂ ⋅ 2H₂O/furfural. The combined treatment with CuCl₂·2H₂O and furfural was the most effective for both its nitrogen reduction and enhancement of the following hydrodenitrogenation. As a result, the first-order hydrodenitrogenation rate increased by 4.4, and the nitrogen content was reduced to 11 wtppm or 230-fold compared with those of the untreated heavier oil. Mixtures of refined heavier oils and heavier-cut coal liquid were also hydrotreated and similar tendencies were obtained.

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通过脱氮预处理对煤制油进行深度加氢处理

摘要研究了将脱氮预处理和深度加氢处理相结合，利用富氮煤液生产清洁运输燃料的方法。煤液中较重的馏分（回收率；13.1 wt%）经蒸馏分离，并通过 CuCl2 - 2H2O、硫酸、糠醛及其组合提取进行脱氮。各处理方法的降氮效果依次为：H2SO4 (48.0%) < CuCl2 ⋅ 2H2O (75.0%) < 糠醛 (80.0%) < H2SO4/ 糠醛 (85.0%) < CuCl2 ⋅ 2H2O/ 糠醛 (92.0%)。使用间歇式高压釜进行的加氢处理试验表明，按照糠醛 < H2SO4 < CuCl2 ⋅ 2H2O < H2SO4/ 糠醛 < CuCl2 ⋅ 2H2O/ 糠醛的顺序进行的脱氮预处理促进了较重油的加氢脱氮。用 CuCl2-2H2O 和糠醛进行联合处理，对氮的还原和随后的加氢脱氮最为有效。因此，与未经处理的重质油相比，一阶加氢脱氮速率提高了 4.4 倍，氮含量降低到 11 wtppm 或 230 倍。对精制重油和重切分煤液的混合物也进行了加氢处理，得到了类似的结果。

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来源期刊

Solid Fuel Chemistry CHEMISTRY, MULTIDISCIPLINARY-ENERGY & FUELS

CiteScore

1.10

自引率

28.60%

发文量

审稿时长

6-12 weeks

期刊介绍： The journal publishes theoretical and applied articles on the chemistry and physics of solid fuels and carbonaceous materials. It addresses the composition, structure, and properties of solid fuels. The aim of the published articles is to demonstrate how novel discoveries, developments, and theories may be used in improved analysis and design of new types of fuels, chemicals, and by-products. The journal is particularly concerned with technological aspects of various chemical conversion processes and includes papers related to geochemistry, petrology and systematization of fossil fuels, their beneficiation and preparation for processing, the processes themselves, and the ultimate recovery of the liquid or gaseous end products.