Composition of acidic compounds in petroleum fraction

doi:10.16085/j.issn.1000-6613.2016.04.017

Abstract

Abstract: The acidic compounds in the feedstock of a refinery(vacuum cut 3) made devices corroded seriously, so the composition and distribution of the acidic compounds were analyzed by negative-ion electrospray ionization Fourier transform ion cyclotron resonance mass spectroscopy (negative-ion ESI FT-ICR MS). The acid fraction was extracted by alkaline-ethanol extraction prior to analysis, and compared with the industrial-grade naphthenic acids. The specialty of the acidic compounds in the feedstock of the refinery was explained from the molecular level. Negative-ion ESI FT-ICR MS revealed that the O₂ class of the extracted acid fraction in the feedstock was dominated by acyclic carboxylic acids (belong to Z=0 family), and those had higher relative abundance of some compounds belonged to Z=-8 and-10 families of the O₂ class, which leads the carbon number distribution curve has two peaks. The relative abundance of O₁ class was much higher than that of other classes except for O₂ class. The O₁ class was dominated by alkylphenols. The special composition and distribution of acidic compounds has an important guiding significance to study the mechanism of corrosion and seek treatments for equipment corrosion.

Key words: petroleum fractions, corrosion, acidic species, negative-ion electrospray ionization Fourier transform ion cyclotron resonance mass spectroscopy(negative-ion ESI-FT-ICR MS), composition

摘要： 针对某炼厂酮苯脱蜡装置原料油(减三线)中酸性物质组成特殊(对装置产生严重的腐蚀)的情况,采用碱醇法提取其中的酸性物质,借助负离子电喷雾-傅里叶变换离子回旋共振质谱(negative-ion ESI FT-ICR MS)研究其酸性组分的组成及分布,并与工业级脱脂环酸进行比较,从分子层面上揭示了其特殊之处.Negative-ion ESI FT-ICR MS结果表明,减三线酸性化合物主要的特点为O₂类化合物中脂肪酸(Z=0)占明显优势,缩合度较大的Z=-8和Z=-10的O₂类化合物中有些碳数的物质相对丰度也比较大,碳数分布有两个中心;O₁类杂原子化合物的相对丰度仅次于O₂类化合物,且大大高出其他类杂原子化合物,O₁类化合物中,烷基酚类化合物占绝对优势.减三线酸性化合物的特殊组成将对进一步探究腐蚀机理和寻求解决设备腐蚀的途径有重要的指导意义.

关键词: 石油馏分, 腐蚀, 酸性物质, 负离子电喷雾-傅里叶变换离子回旋共振质谱, 组成

CLC Number:

TE622

XIAO Lixia, LÜ Ya. Composition of acidic compounds in petroleum fraction[J]. Chemical Industry and Engineering Progree, 2016, 35(04): 1074-1080.

肖丽霞, 吕涯. 石油馏分中酸性物质的组成分析[J]. 化工进展, 2016, 35(04): 1074-1080.

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