Topic
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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TL;DR: In this article, a sample of the high-vitrinite, high-sulfur, high volatile Western Kentucky No. 6 coal from Union County, Kentucky, was subjected to liquefaction conditions at four reaction temperatures, a minimum of four reaction times, a 1.5 Tetralin to coal ratio, and 5.5 MPa of H 2 atmosphere.
Abstract: A sample of the high-vitrinite, high-sulfur, high volatile A bituminous Western Kentucky No. 6 coal from Union County, Kentucky, was subjected to liquefaction conditions at four reaction temperatures, a minimum of four reaction times, a 1.5 Tetralin to coal ratio, and 5.5 MPa of H 2 atmosphere. At reaction temperatures of 658 K and higher vitrinite is virtually absent, being replaced by vitroplast. Vitroplast appears to convert to a granular residue at longer reaction times
3 citations
TL;DR: In this article, it was found that pre-irradiation with X-rays enhances the coal liquefaction yield from 48% to 65% after 10 h of pre-IRradiation.
Abstract: Coal is pre-irradiated with X-rays before being submitted to liquefaction with the aim to depolymerize (upgrade) the complex network to simple chemical species. It was found taht the pre-irradiation enhances the liquefaction yield from 48% (liquefaction without pre-irradiation) to 65% (after 10 h of pre-irradiation with X-rays). Our data suggests that since pyrolytic bond breaking is considered to be the first step in the coal liquefaction process, pre-irradiation with X-rays will create free radicals which then enhance the liquefaction.
3 citations
3 citations
TL;DR: In this paper, the authors examined the drying of coal and the associated thermal and moisture-induced stresses with a numerical model to estimate the rate of surface regression in underground coal gasification, including internal convection, diffusion, conduction and flow of liquid, vapor and gas.
Abstract: The drying of coal and the associated thermal and moisture-induced stresses are examined with a numerical model to estimate the rate of surface regression in underground coal gasification. The model include internal convection, diffusion, conduction and flow of liquid, vapor and gas. The structural failure is modeled by three different mechanisms based upon a strength reduction due to heating, drying, or crack formation. Using properties and boundary conditions appropriate to Western United States coal, the model predicts a regression rate which is in qualitative agreement with measured results. Using the model, it is possible to examine different thermal and failure modes and to gain an understanding of some of the mechanisms which may control the surface regression of coal during gasification. These results may be applicable to the formation of rubble during gasification and to internal cavity collapse.
3 citations
TL;DR: In this paper, the effect of pore structure on the gasification of two chars impregnated with potassium carbonate catalyst was investigated, and the results indicated that both the pore structures of the chars and the chemistry of a particular reaction are key factors in determining the overall catalytic performance.
Abstract: The effect of pore structure on the gasification of two chars impregnated with potassium carbonate catalyst is investigated. Well-characterized char samples were reacted with carbon dioxide, water vapor, and oxygen. The effects of catalyst on the magnitude of the gasification rate as well as on the entire rate vs. conversion pattern are reported. Reactivity and structural data are analyzed to obtain a meaningful comparison of the gasification behavior for all char-gas pairs. Initial intra-particle catalyst dispersion was strongly influenced by the pore structure of the chars. During gasification with carbon dioxide and water, the catalyst appeared to redistribute itself in accordance to the accepted reaction mechanism, leading to superior catalytic activity. The reported measurements indicate that both the pore structure of the chars and the chemistry of a particular reaction are key factors in determining the overall catalytic performance.
3 citations