Structural characterization of tar from a coal gasification plant: comparison with a coke oven tar and a crude oil flash-column residue was written by Pindoria, Ramesh V.;Megaritis, Athanasios;Chatzakis, Ioannis N.;Vasanthakumar, Louis S.;Zhang, Sheng-Fu;Lazaro, Maria-Jesus;Herod, Alan A.;Garcia, Ximena A.;Gordon, Alfredo L.;Kandiyoti, Rafael. And the article was included in Fuel in 1997.Formula: C16H10O This article mentions the following:
Residual tar from a coal gasification plant was characterized using a wide array of anal. techniques. Structural comparisons were made with a coke-oven tar and a crude petroleum flash distillation residue. The gasification tar residue had a carbon aromaticity >94%, with extensively dealkylated aromatic structures and only small amounts of oxygenates, compared with the 56% carbon aromaticity and significant alkyl substitution in the coke-oven tar. The proportion of material b. >450° 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 distillation residue were also higher than those of the other samples. Also as expected, the petroleum flash distillation 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 mol. masses >20,000, with the gasification tar residue showing the narrowest range of mol. masses. Taken together, structural differences between the gasification tar and coke-oven tar reflected the more severe thermal treatment and chem. history of the gasification tar, leading to the survival of low amounts (∼1 weight% of coal feed) of an apparently, chem. very stable residue. In the experiment, the researchers used many compounds, for example, Naphtho[2,1-b]benzofuran (cas: 205-39-0Formula: C16H10O).
Naphtho[2,1-b]benzofuran (cas: 205-39-0) belongs to benzofurans derivatives.Benzofuran is one of the most significant oxygen-containing heterocycles consisting of fused benzene and furan ring, which are widely presented in various naturally occurring and synthetically active compounds. Benzofurans are stable towards alkali and readily polymerize on treatment with sulfuric acid, due to which they are useful for the preparation of low cost chemically relatively inert resins.Formula: C16H10O
Referemce:
Benzofuran – Wikipedia,
Benzofuran | C8H6O – PubChem