共查询到16条相似文献,搜索用时 78 毫秒
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吸附脱硫技术具有操作条件温和、节能、不改变燃油品质和成本低等特点而备受关注。针对噻吩类难脱除硫化物的深度脱除和转化问题,综述了近年来应用多孔吸附材料选择性吸附超深度脱除燃油中噻吩类硫化物的作用机理及最新研究进展。重点分析了分子筛、金属有机骨架、多孔炭材料、复合材料等不同吸附剂的研究现状,并探讨了各种吸附材料的吸附机理、改性方式和优缺点。本文指出分子筛因优异的热稳定性、高比表面积、均一的孔道结构、低成本和易于工业化等特点,是目前最具优势的吸附剂材料。未来研究应着重阐明吸附机理、提高合成便捷性、脱硫性能以及再生能力,更全面系统的研究将为开发具有理想选择性和再生能力的高效吸附剂奠定基础。 相似文献
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由于操作条件温和、成本相对较低、脱硫率高以及绿色环保等优点,氧化脱硫被认为是非加氢脱硫技术中降低燃料油中高硫含量的主要技术之一。本文综述了近些年来国内外关于燃料油氧化脱硫机理的研究进展,详细叙述了使用不同氧化剂(H2O2、油溶性氧化剂、空气、氧气以及固体氧化剂)催化氧化脱硫机理和离子液体中的氧化脱硫机理,简要介绍了低共熔溶剂中的氧化脱硫机理、超声辅助氧化脱硫机理、光催化氧化脱硫机理以及电化学氧化脱硫机理,并对氧化脱硫机理的研究方向提出了见解。加深对氧化脱硫机理的研究将有利于寻求合适的催化剂和反应条件,为更好地指导燃料油以及其他油品深度脱硫的进行提供理论基础,对实际生产也具有重要的理论指导意义。 相似文献
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Güldem Üstün 《Journal of the American Oil Chemists' Society》1996,73(2):203-210
Fatty acid methyl esters (FAME) and resin acids (RA) were separated from tall oil by selective adsorption. Commercial nonmodified
molecular sieve 13X was used as adsorbent. The adsorption isotherms of fatty acids (FA), FAME, and RA on molecular sieve 13X
at 25°C were determined using various solvents. The solvents were methanol, ethanol, isopropanol, acetone, benzene, hexane,
isooctane, petroleum ether (40–60°C), and petroleum naphtha (80–180°C). With each solvent, FA and RA were adsorbed to a greater
extent than FAME. Adsorption isotherms for RA and FAME in binary adsorption systems were also determined using petroleum ether,
petroleum naphtha, benzene, and isopropanol. For each component in the binary adsorption, the equilibrium amounts are lower
than the values for pure component adsorption. The adsorption of FAME decreased in the presence of RA markedly in petroleum
ether and petroleum naphtha. This fact may be the indication of the phenomenon of selective adsorption. Separation was accomplished
by adding a solution of esterified tall oil in solvents used in the binary adsorption systems, through a column packed with
molecular sieve 13X. With petroleum naphtha, FAME and RA were recovered in yields of 93 and 94%, respectively, from esterified
tall oil. Petroleum naphtha gave the best results. The effects of particle size of adsorbent and flow rate of solvent on the
efficiency of the separation were also investigated in fixed-bed column studies. The particle size of adsorbent did not apparently
alter the results. Changes in the particle size should not significantly change the number of available adsorption sites in
a microporous molecular sieve. 相似文献
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多酸材料具备独特的酸性和氧化还原性能,在油品氧化脱硫领域得到广泛关注。本文综述了多酸材料在油品催化氧化脱硫领域的研究进展,详细叙述了多酸离子液体催化剂和以金属有机框架、氧化物、碳材料等为载体的负载型多酸催化剂的特点及其催化氧化燃油中多种有机硫化物的脱硫效果。将多酸与离子液体或其他载体结合后不仅能有效增强多酸的催化活性,而且可提高催化剂的热稳定性与重复利用性。本文对各类载体的特点及发展前景进行了详细比较,并对其研究现状进行了梳理。最后对多酸材料在氧化脱硫领域的发展方向提出了展望,指出了具有良好催化活性、循环性能及经济适用性强的多酸材料是未来的研究方向。 相似文献
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Jiajun Gao Xingyu Chen Nannan Ren Wenjiao Wu Chunxi Li Hong Meng Yingzhou Lu 《American Institute of Chemical Engineers》2013,59(8):2966-2976
Excellent desulfurization is achieved via reactive adsorption using Friedel‐Crafts acylation materials, that is, acylating reagents and Lewis acids, such as acetyl chloride (AC) and AlCl3, being named as acylation desulfurization (ACDS). For model oil, thiophenic compounds, namely, dibenzothiophene, benzothiophene, and thiophene, are removed completely by AC–AlCl3 within 30 min at room temperature. In this process, thiophenic compounds are acylated by AC under the catalysis of AlCl3, and the acylated derivatives are stronger base than original ones due to incorporation of O‐containing carbonyl group (C?O) and, thus, adsorbed more easily by AlCl3 via Lewis acid–base complexation. Further, ACDS mechanism is identified by acylated product characterization and quantum chemistry calculation. Satisfactorily, ACDS is still effective for toluene‐rich and real oils, and real oil quality is improved with desulfurization proceeding. © 2013 American Institute of Chemical Engineers AIChE J, 59: 2966–2976, 2013 相似文献