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EXTRACTION APPROACH FOR DESULPHURIZATION AND DEAROMATIZATION OF MIDDLE DISTILLATES

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Author(s): P. Petkov | J. Tasheva | D. Stratiev

Journal: Petroleum and Coal
ISSN 1337-7027

Volume: 46;
Issue: 2;
Start page: 13;
Date: 2004;
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Keywords: extraction | desulphurization | dearomatization | diesel

ABSTRACT
Reduction of sulphur content in diesel to near zero levels plays a significant role for improving air quality. Hydrodesulphurization is the most developed desulphurization technology today. However meeting the 10 ppm sulphur limit in the diesel fuel requires expensive revamps of the existing hydrotreating units or building of new grass root units. This specification also necessitates running the units at higher severity which is related to higher energy consumption and higher amount of emissions of CO2 release in the atmosphere. Extraction of sulphur and aromatic compounds from the middle distillates offers another opportunity for desulphurization and dearomatization of diesel fractions at low temperatures without participation of hydrogen. This process allows a substantial reduction in the energy consumption. It was found in this study that by extraction of heating gas oil and hydrotreated diesel with the selective solvents, methanol, furfural, and ethylene glycol the sulphur content could be reduced sevenfold and the aromatics content threefold respectively. The extraction of the sulphur compounds from the hydrotreated diesel was about 40% more efficient than that of the heating gas oil, while the extraction of the aromatics from the hydrotreated diesel was twice as high as that from the heating gas oil. This indicates that the chemical nature of the middle distillate fractions plays a significant role on the efficiency of the extraction process.
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