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Carbochemistry

About: Carbochemistry is a research topic. Over the lifetime, 1010 publications have been published within this topic receiving 16626 citations.


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Journal ArticleDOI
TL;DR: In this article, a series of coal liquefaction runs made to test this premise, there was no effect of tetrahydroquinoline addition to hydrogenated phenanthrene and SRC-II solvent on the product distribution from coal liquidation, but there was a very pronounced effect with anthracene oil as solvent.
Abstract: SRC-II recycle solvents contain substantial amounts of heterocyclic compounds such as quinoline; hydrogenated derivatives of such compounds can be good H-donors. In addition, hydrogenation of quinoline to tetrahydroquinoline is faster than that of the corresponding homocyclic aromatic compound such as naphthalene. Hence, such compounds should aid in maintaining the H-donor capability of recycle solvents at high levels during all phases of coal conversion. In a series of coal liquefaction runs made to test this premise, there was no effect of tetrahydroquinoline addition to hydrogenated phenanthrene and SRC-II solvent on the product distribution from coal liquefaction. However, there was a very pronounced effect with anthracene oil as solvent. Adduction of tetrahydroquinoline led to a net loss of solvent and a very high yield of asphaltenes. These results indicate the formation of adducts through the reactions of solvent and coal species. The level of adduction lessened with extended reaction times, indicating some reversibility.

6 citations

Journal ArticleDOI
TL;DR: In this article, the authors proposed an approach based on the fact that paraffinic hydrocarbons undergo exchange with tetralin or tetrahydroquinoline slowly under conditions (420°C for 1 h) that decompose the coal.
Abstract: The approach is based on the fact that paraffinic hydrocarbons undergo exchange with tetralin-d 12 or tetrahydroquinoline-2,2,3,4,4-d 5 slowly under conditions (420°C for 1 h) that decompose the coal. In this situation, hydrocarbons that were entrapped within the macromolecular network are obtained essentially free of deuterium whereas the hydrocarbons that were formed as a consequence of thermal bond cleavage are labeled

6 citations

Journal ArticleDOI
TL;DR: In this paper, the impact of process variables on total coal conversion is quantified by subdividing the reaction scheme into an initial mass-transfer-controlled interval, followed by a second kinetically controlled one.
Abstract: Direct Coal Liquefaction has been treated as a purely kinetic process previously. Reaction rates have been related to intrinsic rates of product formation from specific coals. The impact of process variables on total coal conversion is quantified in the present model by subdividing the reaction scheme into an initial mass-transfer-controlled interval, followed by a second kinetically controlled one. The results from eight verification trials, involving six coals liquefied under a broad range of reaction conditions and in three different reactor types, are presented

6 citations

Journal ArticleDOI
TL;DR: In this paper, the fluid-coker tars, produced by Lummus-Crest, Inc., from coal liquefaction vacuum bottoms, were characterized to evaluate their use as liquefactory recycle oils.
Abstract: Ten fluid-coker tars, produced by Lummus-Crest, Inc., from coal liquefaction vacuum bottoms, were characterized to evaluate their use as liquefaction recycle oils. The primary variables in the coking tests were temperature (1000-1200 o F) and coker feedstock source. Most of the properties of the tars are principally influenced by the coking temperature. Those produced at higher temperature are more aromatic, they contain more carbon and less hydrogen, and they are principally unsubstituted and methyl-substituted condensed aromatic compounds. The heteroatom contents of the tars appear to be mainly determined by the coker feedstock

6 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
20182
20176
20168
20155
20147
20138