文献类型：期刊文献

英文题名：Structural analysis of petroleum acids in highly acidic crude oil and deacidification using organic amines

作者：Ma, Ruochen[1,2];Jia, Lingli[1,2];Zhang, Hongyu[3];Cao, Fahai[1,2];Shao, Jianhui[1,2];Zhang, Junjie[1,2];Yan, Shuiliang[1,2];Xu, Jun[1,2]

机构：[1]East China Univ Sci & Technol, Sch Chem Engn, Shanghai 200237, Peoples R China;[2]East China Univ Sci & Technol, Large Ind Reactor Engn Res Ctr, Minist Educ, Shanghai 200237, Peoples R China;[3]SINOPEC, Qilu Branch Co, Res Inst, Gaomi 261502, Peoples R China

年份：2024

卷号：360

外文期刊名：FUEL

收录：;EI(收录号：20235115237933);WOS:【SCI-EXPANDED(收录号:WOS:001137771000001)】；

基金：This research is supported by the National Natural Science Foundation of China (21878098) and China Petroleum Engineering Corp., Ltd. (CPEC) (2021ZYGC-01-01) . The authors would also like to thank Sinopec Qilu for raw material support and Luoyang Shuangyang Instrument Company for technical support.

语种：英文

外文关键词：Crude oil; Deacidification; Naphthenic acids; Electrical dehydration

摘要：Naphthenic acids, polar compounds with carboxylic group, are commonly found in crude oils as product of biodegradation. The presence of NAs in oil can cause corrosion of processing equipment and pipelines and can lead to degradation of crude oil quality. Qilu high acid crude oil was designated for research, from which the acidic fraction was separated by caustic extraction. Elemental analysis, Fourier transform infrared spectroscopy, nuclear magnetic resonance and high-resolution Orbitrap mass spectrometry were used for characterization. The structure of the acidic fraction was verified to be naphthenic acids primarily, and the average molecular formula was obtained. Based on the derivation of the modified B-L method, the average molecular structure was monocycloalkyl benzoic acid with single carboxyl substitution The effects of various depickling solvents and process conditions on deacidification results as well as product were investigated and illustrated with potentiometric titration, UV spectroscopy, zeta potential test and Karl Fischer method. Among the three groups of deacidifiers, inorganic bases represented by sodium hydroxide have the best deacidification efficiency, reaching 83.5 %. But the emulsification caused by sodium naphthenate is severe and the emulsion is stable, making it difficult to achieve oil-water separation. Polyethylene polyamines cause the least emulsification. Moreover, as the number of amino groups in the monomer rises, the number of sites that can be neutralized with petroleum acids increases, and the deacidification rate rises. As result, the most suitable deacidifier for processing is ethanolamine, which can reduce the total acid number of crude oil to 0.47 after three stages of deacidification at 70 degrees C and a concentration of 10 %.