Structural characterization of tar from a coal gasification plant: Comparison with a coke oven tar and a crude oil flash-column residue
Identifieur interne : 000F20 ( Main/Exploration ); précédent : 000F19; suivant : 000F21Structural characterization of tar from a coal gasification plant: Comparison with a coke oven tar and a crude oil flash-column residue
Auteurs : Ramesh V. Pindoria [Royaume-Uni] ; Athanasios Megaritis [Royaume-Uni] ; Ioannis N. Chatzakis [Royaume-Uni] ; Louis S. Vasanthakumar [Royaume-Uni] ; Sheng-Fu Zhang [Royaume-Uni] ; Maria-Jesus Lazaro [Royaume-Uni] ; Alan A. Herod [Royaume-Uni] ; Ximena A. Garcia [Chili] ; Alfredo L. Gordon [Chili] ; Rafael Kandiyoti [Royaume-Uni]Source :
- Fuel [ 0016-2361 ] ; 1996.
Abstract
Residual tar from a coal gasification plant was characterized using a wide array of analytical techniques. Structural comparisons were made with a coke oven tar and a crude oil flash-column residue. The gasification tar residue was found to have a carbon aromaticity >94%, with extensively dealkylated aromatic structures and only small amounts of oxygenates, compared with the 56% carbon aromaticity and significant occurrence of alkyl substitution in the coke oven tar. The proportion of material boiling > 450°C as well as the elemental carbon and ‘fixed carbon’ contents of the gasification tar residue were also higher than those of the other samples. As expected, the petroleum flash-column residue was mainly aliphatic (fa = 0.12), with small aromatic ring systems attached to long alkyl chains. For all three samples, MALDI mass spectra showed a signal at molecular masses > 20 000 u, with the gasification tar residue showing the narrowest range of molecular masses. Taken together, structural differences between the gasification tar and coke oven tar reflect the more severe thermal treatment and chemical history of the gasification tar, leading to the survival of low amounts (∼ 1 wt% of coal feed) of an apparently, chemically, very stable residue.
Url:
DOI: 10.1016/S0016-2361(96)00198-6
Affiliations:
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Chatzakis</name><affiliation wicri:level="4"><country xml:lang="fr">Royaume-Uni</country><wicri:regionArea>Department of Chemical Engineering and Chemical Technology, Imperial College, University of London, Prince Consort Road, London SW7 2BY</wicri:regionArea><orgName type="university">Université de Londres</orgName><placeName><settlement type="city">Londres</settlement><region type="country">Angleterre</region><region type="région" nuts="1">Grand Londres</region></placeName></affiliation></author><author><name sortKey="Vasanthakumar, Louis S" sort="Vasanthakumar, Louis S" uniqKey="Vasanthakumar L" first="Louis S." last="Vasanthakumar">Louis S. Vasanthakumar</name><affiliation wicri:level="4"><country xml:lang="fr">Royaume-Uni</country><wicri:regionArea>Department of Chemical Engineering and Chemical Technology, Imperial College, University of London, Prince Consort Road, London SW7 2BY</wicri:regionArea><orgName type="university">Université de Londres</orgName><placeName><settlement type="city">Londres</settlement><region type="country">Angleterre</region><region type="région" nuts="1">Grand Londres</region></placeName></affiliation></author><author><name sortKey="Zhang, Sheng Fu" sort="Zhang, Sheng Fu" uniqKey="Zhang S" first="Sheng-Fu" last="Zhang">Sheng-Fu Zhang</name><affiliation wicri:level="4"><country xml:lang="fr">Royaume-Uni</country><wicri:regionArea>Department of Chemical Engineering and Chemical Technology, Imperial College, University of London, Prince Consort Road, London SW7 2BY</wicri:regionArea><orgName type="university">Université de Londres</orgName><placeName><settlement type="city">Londres</settlement><region type="country">Angleterre</region><region type="région" nuts="1">Grand Londres</region></placeName></affiliation></author><author><name sortKey="Lazaro, Maria Jesus" sort="Lazaro, Maria Jesus" uniqKey="Lazaro M" first="Maria-Jesus" last="Lazaro">Maria-Jesus Lazaro</name><affiliation wicri:level="4"><country xml:lang="fr">Royaume-Uni</country><wicri:regionArea>Department of Chemical Engineering and Chemical Technology, Imperial College, University of London, Prince Consort Road, London SW7 2BY</wicri:regionArea><orgName type="university">Université de Londres</orgName><placeName><settlement type="city">Londres</settlement><region type="country">Angleterre</region><region type="région" nuts="1">Grand Londres</region></placeName></affiliation></author><author><name sortKey="Herod, Alan A" sort="Herod, Alan A" uniqKey="Herod A" first="Alan A." last="Herod">Alan A. 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Structural comparisons were made with a coke oven tar and a crude oil flash-column residue. The gasification tar residue was found to have a carbon aromaticity >94%, with extensively dealkylated aromatic structures and only small amounts of oxygenates, compared with the 56% carbon aromaticity and significant occurrence of alkyl substitution in the coke oven tar. The proportion of material boiling > 450°C as well as the elemental carbon and ‘fixed carbon’ contents of the gasification tar residue were also higher than those of the other samples. As expected, the petroleum flash-column residue was mainly aliphatic (fa = 0.12), with small aromatic ring systems attached to long alkyl chains. For all three samples, MALDI mass spectra showed a signal at molecular masses > 20 000 u, with the gasification tar residue showing the narrowest range of molecular masses. Taken together, structural differences between the gasification tar and coke oven tar reflect the more severe thermal treatment and chemical history of the gasification tar, leading to the survival of low amounts (∼ 1 wt% of coal feed) of an apparently, chemically, very stable residue.</div></front></TEI><affiliations><list><country><li>Chili</li><li>Royaume-Uni</li></country><region><li>Angleterre</li><li>Grand Londres</li></region><settlement><li>Londres</li></settlement><orgName><li>Université de Londres</li></orgName></list><tree><country name="Royaume-Uni"><region name="Angleterre"><name sortKey="Pindoria, Ramesh V" sort="Pindoria, Ramesh V" uniqKey="Pindoria R" first="Ramesh V." last="Pindoria">Ramesh V. Pindoria</name></region><name sortKey="Chatzakis, Ioannis N" sort="Chatzakis, Ioannis N" uniqKey="Chatzakis I" first="Ioannis N." last="Chatzakis">Ioannis N. Chatzakis</name><name sortKey="Herod, Alan A" sort="Herod, Alan A" uniqKey="Herod A" first="Alan A." last="Herod">Alan A. Herod</name><name sortKey="Kandiyoti, Rafael" sort="Kandiyoti, Rafael" uniqKey="Kandiyoti R" first="Rafael" last="Kandiyoti">Rafael Kandiyoti</name><name sortKey="Lazaro, Maria Jesus" sort="Lazaro, Maria Jesus" uniqKey="Lazaro M" first="Maria-Jesus" last="Lazaro">Maria-Jesus Lazaro</name><name sortKey="Megaritis, Athanasios" sort="Megaritis, Athanasios" uniqKey="Megaritis A" first="Athanasios" last="Megaritis">Athanasios Megaritis</name><name sortKey="Vasanthakumar, Louis S" sort="Vasanthakumar, Louis S" uniqKey="Vasanthakumar L" first="Louis S." last="Vasanthakumar">Louis S. Vasanthakumar</name><name sortKey="Zhang, Sheng Fu" sort="Zhang, Sheng Fu" uniqKey="Zhang S" first="Sheng-Fu" last="Zhang">Sheng-Fu Zhang</name></country><country name="Chili"><noRegion><name sortKey="Garcia, Ximena A" sort="Garcia, Ximena A" uniqKey="Garcia X" first="Ximena A." last="Garcia">Ximena A. Garcia</name></noRegion><name sortKey="Gordon, Alfredo L" sort="Gordon, Alfredo L" uniqKey="Gordon A" first="Alfredo L." last="Gordon">Alfredo L. Gordon</name></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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