Ultra low sulfur diesel by oxidative desulfuriztion of HDS diesel
IR@IIP: CSIR-Indian Institute of Petroleum, Dehradun
View Archive Info| Field | Value | |
| Creator |
Sain,Bir
Khanna,M.K Nanoti,S.M Nautiyal,B.R Rao,T.V Das,Guru Paul,Dharam Sharma,Y.K Prasad,V.V.D.N Murali Dhar,G Gupta,A.K Garg,M.O |
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| Date |
2010-05-17T09:17:20Z
2010-05-17T09:17:20Z 2010-05-17T09:17:20Z |
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| Identifier |
XIII RTM, 14th – 16th NOVEMBER, 2005 HYDERABAD,2005
http://hdl.handle.net/123456789/571 |
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| Description |
Due to increasing environmental concerns developed countries have put stringent
limits on sulfur levels in fuel and now these limits are being implemented in the
developing countries also. The US EPA released new regulation limiting sulfur in
diesel to 15ppm by 2006. In India diesel fuel with 50 ppm sulfur is to be used in
11 major cities and 350 ppm in rest of the country by 2010. The pressing needs to
reduce sulfur levels to ultra low in diesel have aggressively accelerated the
research and development activities in the area of diesel desulfurization. The
most targeted deep hydrodesulfurization processes have inherent problems like
high capital and operational costs, high energy requirements difficult to justify it
for small refiners on one hand and limitations of the catalyst to desulfurize sulfur
species like 4,6-dimethyl dibenzothiophene (4,6-DMDBT) on the other hand.
Owing to these difficulties, alternative methods like oxidative desulfurization, biodesulfurization,
liquid-liquid extraction, and selective adsorption are being
investigated worldwide for desulfurization of diesel fuel. Among the alternative
approaches oxidative desulfurization, which involves oxidation of sulfur
compounds present in diesel to more polar sulphones/ sulphoxides followed by
their removal by solvent extraction/ adsorption has attracted worldwide attention.
Oxidation of sulfur compounds present in HDS diesel containing about 500ppm
sulfur was extensively studied first in mixer settler and then in a continuous
counter current oxidation reactor with a oxidizing solution consisting of carboxylic
P-16
XII RTM, 14th – 16th NOVEMBER, 2005 HYDERABAD 540
acid (CA) and active oxygen containing species to achieve their quantitative
oxidation to sulphones/ sulfoxides. This was followed by counter current
extraction of sulphones/ sulphoxides from oxidized diesel with N-methyl
pyrolidinone - antisolvent mixture and final finishing by passing through a bed of
silica/ alumina to obtain ultra low sulfur diesel (ULSD).
Oxidation of sulfur compounds present in HDS diesel was also studied in a
continuous down flow fixed bed laboratory reactor with organic hydroperoxide in
presence of transition metal containing heterogeneous catalyst to achieve their
quantitative oxidation to sulphones/ sulphoxides. The sulphones/sulphoxides
thus formed could be removed from oxidized diesel by adsorption on solid
alumina / silica to obtain ultra low sulfur diesel (ULSD).
Both these approaches for oxidative desulfurization (ODS) of HDS diesel were
found to be efficient to obtain ultra low sulfur diesel (ULSD) with less than 10 ppm
sulfur content and are discussed in detail in this article.
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| Language |
en_US
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| Subject |
Ultra low sulfur diesel
oxidative desulfuriztion HDS diesel |
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| Title |
Ultra low sulfur diesel by oxidative desulfuriztion of HDS diesel
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| Type |
Article
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