工艺条件对柴油吸附分离重芳烃轻质化反应的影响

doi:10.19964/j.issn.1006-4990.2023-0428

Abstract

Abstract:

The adsorptive separation of heavy aromatics from fuel fractions yields is an efficient way to utilize surplus gasoline and diesel resources in refineries.The non-aromatic products can be used to increase the production of low-carbon olefins through steam cracking or catalytic cracking processes.The aromatic products are mainly composed of mono-aromatics，which can be turned into good feedstocks for ethylene production and light aromatics like benzene，toluene，and xylene through the heavy aromatic lightening technology.The hydrogen solubility was measured using adsorption separation of heavy aromatic hydrocarbon components as raw materials.The solubility of H₂ in the heavy aromatics was between 1.0×10^-4~3.2×10^-4 mol/g，and increased with temperature and H₂ pressure.It was 1~2 order of magnitude lower than that needed for the hydrogenation of ploy-aromatics to mono-aromatics.The effects of the reduction temperature of catalyst precursor，the aspect ratio of fixed-bed reactor，the reaction temperature，the H₂ partial pressure，the H₂-oil ratio，and the weight hourly space velocity（WHSV） on the lightening of heavy aromatics obtained by adsorptive separation from a diesel fractions over a NiMo/β catalyst were also studied.Over the catalyst prepared by reduction of the precursor under relatively low temperature and high pressure（350 ℃ and 4 MPa），the optimal reaction conditions were aspect ratio of 4.5，reaction temperature of 400~410 ℃，H₂ pressure of 5.0~5.5 MPa，H₂-oil ratio of 800~1000，and WHSV of 1~1.5 h^-1.Under the conditions，the conversion of the C₁₀⁺ compounds was above 85%，while the yield and the purity of C₆~C₉ aromatics were more than 50% and 97.5%，respectively.The coupling of diesel adsorptive separation and the lightening of the obtained heavy aromatics to light aromatics greatly improved the yields of chemicals from diesel fractions，which made broad application prospect and enormous practical significance.

Key words: adsorption separation process of aromatics, diesel aromatic, heavy aromatics to light aromatic, aromatic yield, H₂ solubility

CLC Number:

TQ127.2

LIU Kailong, ZHU Kongyi, GUO Chunlei, MA Xiaobiao, WANG Yujian, SHENG Qiang, LI Xiang, WANG Yinbin, JIN Fengying. Effects of process condition on performance of diesel aromatic to light aromatic[J]. Inorganic Chemicals Industry, 2024, 56(6): 139-146.

Figures/Tables 12

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C₁₀⁺组分转化率/%	氢分压/MPa	质量空速/h^-1	反应器炉温/℃	C₆~C₉芳烃收率/%	C₆~C₉芳烃纯度/%
84.95	5	0.6	384	52.90	93.85
86.01	5	1.0	398	53.01	97.50
85.13	5	1.5	400	52.69	98.08
85.15	5	2.0	412	52.10	97.80

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Inorganic Acid-Base-Salt Committee of CIESC

Effects of process condition on performance of diesel aromatic to light aromatic

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