Organic nitrogen compounds in gas oil blends, their hydrotreated products and the importance to hydrotreatment
Organic nitrogen compounds in gas oil blends, their hydrotreated products and the importance to hydrotreatment
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DOI：
10.1016/s0920-5861(00)00566-6
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发表时间：
2001-02
期刊：
影响因子：
5.3
通讯作者：
P. Zeuthen;K. Knudsen;D. Whitehurst
中科院分区：
文献类型：
--
作者：
P. Zeuthen;K. Knudsen;D. Whitehurst
在催化裂化和HDA进料的预处理中，主要目的是减少进料中有机硫和氮化合物的量[Catal. Rev.- Sci. 36（1994）75]。有机氮化合物对加氢反应具有显著的负动力学效应。讨论了有机氮化合物在原料油和加氢产品中的分布。烷基取代的咔唑被发现是占主导地位的和最折射的有机氮化合物在饲料。我们的研究结果表明，吲哚和喹啉是非常活跃的咔唑相比。通过对吡咯类苯系物的表征，得出了取代基越多，反应活性越低的结论。众所周知，有机硫的转化通过两种不同的机理途径进行：直接途径和氢化途径[J.Catal.61（1981）523; AIChE J.27（1981）663; J.Catal.97（1986）52; Catal. Today，in press; Polyhedron 16（1997）3213]。氢化途径转化了大多数折射率的S-分子，并且在N-化合物的转化中起着非常重要的作用。与类似的硫化合物相比，含氮分子通常表现出非常低的反应性。使用模型原料的几项研究表明，含氮分子，特别是碱性有机氮化合物抑制HDS反应[Appl.Catal.A170（1998）1]。在这项研究中，真实的进料实验已经证明，即使咔唑是缓慢的反应，并在主要的N-化合物，它是基本的N-化合物，是柴油燃料中的主要抑制物种。
In the pretreatment of feeds for catalytic cracking and for HDA, the primary objective is to reduce the amount of organic sulfur and nitrogen compounds in the feedstock [Catal. Rev.-Sci. Eng. 36 (1994) 75] . Organic nitrogen compounds have a significantly negative kinetic effect on hydrotreating reactions. The distribution of the organic nitrogen compounds in feed and hydrotreated products is discussed. Alkyl-substituted carbazoles are found to be the dominant and most refractive organic nitrogen compound in the feed. Our results show that indoles and quinolines are very reactive as compared with carbazoles. From the characterization of the pyrrole benzologues, it is concluded that the more the substituents, the lesser the reactivity. It is well known that conversion of organic sulfur occurs via two different mechanistic routes: the direct and the hydrogenation route [J. Catal. 61 (1981) 523; AIChE J. 27 (1981) 663; J. Catal. 97 (1986) 52; Catal. Today, in press; Polyhedron 16 (1997) 3213] . The hydrogenation route converts the most refractive S-molecules and plays a very important role in the conversion of N-compounds. N-containing molecules often show a very low reactivity as compared with the analogous sulfur compounds. Several studies using model feedstocks show that nitrogen-containing molecules, and in particular, basic organic nitrogen compounds inhibit the HDS reaction [Appl. Catal. A 170 (1998) 1] . In this study, real feed experiments have demonstrated that even though carbazoles are slow to react and are among the predominant N-compounds, it is the basic N-compounds that are the major inhibiting species in diesel fuels.