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Continuous extraction of naphthenic acid from low-grade oil using 1,6-hexanediol in an ammonia solution

Authors
Kang, Sung ShinKim, Tae HyunCho, Dong WooKim, Jong-NamKang, Jeong Won
Issue Date
15-1월-2023
Publisher
ELSEVIER SCI LTD
Keywords
High-acid crude; Acidity reduction; Naphthenic acid; Oil upgrading; 1; 6-hexanediol; Ammonia solution
Citation
FUEL, v.332
Indexed
SCOPUS
Journal Title
FUEL
Volume
332
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/146451
DOI
10.1016/j.fuel.2022.126008
ISSN
0016-2361
Abstract
The efficient use of low-quality crude oil is one short-term solution to overcoming the imminent energy crisis due to the depletion of fossil resources. Several methods have been developed to upgrade low-quality oil, the most important part of which is the removal of acidic components. High-acid crudes can be converted to lower-acid crudes using various methods based on physical and chemical principles. In this contribution, we suggest an efficient and economical method based on liquid-liquid extraction. The candidate solvent was screened from a thermodynamic analysis in a previous study, and the additives and process conditions were adjusted according to experimental results. As the final solvent choice, 1,6-hexanediol in an aqueous ammonia solution showed the best performance with the minimal amount of solvent (weight fraction of 0.6). Experiments showed that the proposed solvent can be used to treat real crude oil used in the industry. A continuous operation scheme was suggested with solvent regeneration and recycling combined with separation of the acidic residue. The results showed that the proposed extraction process can reduce 85% of the acidic component in high-acid crudes and that repeated use of the solvent is possible.
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Graduate School of Energy and Environment (KU-KIST GREEN SCHOOL) > Department of Energy and Environment > 1. Journal Articles

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Kang, Jeong Won
공과대학 (화공생명공학과)
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