渤海稠油及其组分中杂原子化合物的负离子电喷雾-高分辨质谱分析

发布时间：2018-04-11 12:36

本文选题：稠油 + 沥青质　；参考：《分析测试学报》2017年06期

【摘要】：采用沉淀法和色谱分离法将渤海某油田稠油分离成沥青质、胶质、剩余分3个组分。采用负离子电喷雾技术(ESI)结合高分辨傅立叶变换离子回旋共振质谱仪(FT-ICR MS)研究了该稠油及各组分的分子组成。结果表明,剩余分中有较少的极性杂原子化合物能被负离子ESI电离,如N_1,N_1O_1,O_1和O_2类,其等效双键数(DBE)较小。胶质和原油中极性化合物有相同的杂原子类型,包括N_1,N_1O_1,N_1O_2,N_2,N_2O_2S_1,O_1,O_2,其中胶质和原油中N_1,O_1,O_2类化合物的DBE-碳数分布图相似。沥青质中富集高缩合度且多杂原子的酸性化合物,如含杂原子N_,S的氧化程度高的化合物(N_2O_1,N_1O_3,S_1O_3)及O_3类化合物,这些物质具有较高的界面活性,易吸附在界面上促进界面张力降低和增强界面膜强度,从而有利于乳状液稳定存在。N_1O_1,N_1O_2,N_1O_3类化合物,N_2O_1类化合物可能分别是N_1化合物,N_2化合物的氧化降解产物;随着氧化降解程度增加,降解产物的极性明显增强。
[Abstract]:Heavy oil in a Bohai oilfield was separated into asphaltene, colloid and three components by precipitation and chromatographic separation.The molecular composition of the heavy oil and its components was studied by using ESI and FT-ICR MS with high resolution Fourier transform ion cyclotron resonance mass spectrometer.The results show that less polar hetero-atomic compounds can be ionized by anion ESI. For example, the equivalent double bond number is smaller than that of Ns _ 1N _ 1O _ 1O _ (1) and O _ (2).Easy adsorption at the interface promotes the reduction of interfacial tension and the enhancement of the strength of the interfacial membrane, which is conducive to the stable existence of the emulsion.With the increase of the degree of oxidation degradation, the polarity of the degradation products increased obviously.
【作者单位】：海洋石油高效开发国家重点实验室;中海油研究总院;中国科学院化学研究所;中国石油大学(北京)提高采收率研究院;
【基金】：国家科技重大专项“海上油田化学驱油技术”(2016ZX05025-003)
【分类号】：O657.63;TE622.1

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