DESULFURIZATION OF LIGHT CYCLE OIL USING INNOVATIVE ROUTE
IR@IIP: CSIR-Indian Institute of Petroleum, Dehradun
View Archive Info| Field | Value | |
| Creator |
Nautiyal,B.R
Nanoti,S.M Sain,Bir Rao,T.V Paul,Dharam Sharma,Y.K Garg,M.O |
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| Date |
2010-05-17T10:31:45Z
2010-05-17T10:31:45Z 2010-05-17T10:31:45Z |
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| Identifier |
Proceeding of Petrotech -2007 ,January 15-19, 2007, New Delhi Paper ID. - 0548
http://hdl.handle.net/123456789/573 |
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| Description |
Due to environmental concern, diesel fuel specifications are becoming more and more stringent particularly with
respect to sulphur and aromatic content. By the end of 2005, regulations will require refiners to drastically lower
sulphur content of diesel as part of continuing efforts to reduce air pollution. One of the largest drags on the
quality of the diesel is light cycle oil (LCO), which is normally high in sulphur, nitrogen and particularly in aromatic
content, needs to be upgraded.
The conventional way to upgrade the LCO is hydrotreating. However, reducing the aromatics through
hydrogenation is a much tougher job than hydrodesulphurization as it requires high pressure operation and high
hydrogenation consumption particularly for high aromatic feedstocks such as LCO. Considering high cost of H2
production a critical economic evaluation is necessary for this option. Moreover additional H2 generation also
results in increase of CO2, a GHG formation. To overcome this problem, alternative routes for upgradation of LCO
are being tried. One option is use of solvent extraction route. Using liquid liquid extraction, it is possible to reduce
these aromatics making LCO higher in cetane and lower in sulphur content. Moreover, valuable aromatic
hydrocarbons extract obtained as by product are of great demand in chemical industry. Among them, 2,6-
dimethylnaphthalene is the elementary raw material for engineering plastic (PEN plastic) and polymer liquid
crystal. However earlier studies carried out at IIP, have indicated that although the raffinate obtained meets
EURO –III specifications for diesel with respect to cetane no. and PAH content, but meeting S specifications is
still not possible. The extraction process is further improved by oxidation of sulfur compounds present in LCO.
Oxidation converts sulfur compounds to sulphones which become highly polar and hence extracted selectively.
In the present study at Indian Institute of Petroleum (IIP), Dehradun upgradation of LCO have been carried out
using oxidation of sulfur compounds present in LCO followed by extraction. The study involves the oxidation of
sulphur compounds present in the LCO stream using suitable oxidizing agent and a catalyst. The study revealed
that oxidation have substantial effect on sulfur compounds present in LCO and the sulphones thus produced can
be extracted using liquid-liquid extraction, bringing down S content to less then 350 ppm.
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| Language |
en_US
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| Subject |
Light cycle oi
Oxidant Catalyst Extraction Oxidized feedstock |
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| Title |
DESULFURIZATION OF LIGHT CYCLE OIL USING INNOVATIVE ROUTE
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| Type |
Article
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