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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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31 Jul 2017
TL;DR: In this paper, gasification tests for the Alagtolgoi and Ailbayan coal deposits were conducted in the temperature up to 850°C using bench scale reactor in order to evaluate product gas composition.
Abstract: The gasification tests for the Alagtolgoi and Ailbayan coal deposits were conducted in the temperature up to 850°C using bench scale reactor in order to evaluate product gas composition. Prior to the gasification experiments, the raw coal was pyrolysed in a stainless steel reactor under N2 atmosphere at a temperature of 500°C for 1 h. General behavior of the coal conversion was quite similar for both coals. The gasification tests show that an increase in temperature enhances the formation of hydrogen, carbon dioxide and carbon monoxide. The highest yield of hydrogen and carbon dioxide concentrations of the Ailbayan coal are achieved at temperature of 850°C, which were 2.859 mmol⋅g-1⋅min-1 and 1.054 mmol⋅g-1⋅min-1 respectively. However maximum rate of hydrogen for Alagtolgoi subbituminous coal reached around 800°C. Overall results show that the maximum gasification rate is reached earlier for subbituminous coal than for bituminous coal, but product gas evolution was higher for the investigated bituminous coal.
TL;DR: In this article, the effect of chemical pretreatment of coal on the yields of liquid products is studied by hydroextraction of the raw and pretreated coals at 360°C and 10 MPa hydrogen pressure in tetralin.
01 Jan 1991
TL;DR: In this paper, a study was conducted to examine the gasification test of coal liquefaction residue from pilot plant and showed that residue can be used as a means to dispose of the coal-liquefaction byproduct.
Abstract: Publisher Summary This chapter discusses a study to examine the gasification test of coal liquefaction residue from pilot plant. Four gasification tests for each sample were carried out at varying O 2 /coal feed ratios. Examination of the residue from the de-ashing unit and the Yallourn brown coal led to a program of gasification tests with the brown coal alone and the residue mixture. Brown coal is an excellent feedstock for entrained-flow gasification if less than 1% of acidic material is added to improve slag fusibility. The studies with the mixture including residue show that gasification can be a means to dispose of the coal liquefaction by-product. The high sulfur content of the mixed feed will be converted to H 2 S. This H 2 S is passed after separation from raw gas to the Claus unit for elemental sulfur production. In some coal liquefaction processes, an extensive by-product recovery is inevitable. An effective method for the treatment and/or utilization of the residue from the coal liquefaction process is also elaborated.
30 Sep 1993
TL;DR: In this article, the dual role of oxygen functions in thermal pretreatment and liquefaction of low-rank coals through the application of analytical techniques and theoretical models was elucidated and modeled.
Abstract: The overall objective of this project was to elucidate and model the dual role of oxygen functions in thermal pretreatment and liquefaction of low rank coals through the application of analytical techniques and theoretical models. The project was an integrated study of model polymers representative of coal structures, raw coals of primarily low rank, and selectively modified coals in order to provide specific information relevant to the reactions of real coals. The investigations included liquefaction experiments in microautoclave reactors, along with extensive analysis of intermediate solid, liquid and gaseous products. Attempts were made to incorporate the results of experiments on the different systems into a liquefaction model.
TL;DR: In this paper, a structural group analysis of coal products from the liquefaction of Highvale Coal (Alberta) was performed using a combination of proton NMR and carbon-13 NMR.
Abstract: Products from liquefaction of Highvale Coal (Alberta. subbituminous) in anthracene oil and recycled product, with iron oxide catalyst, were studied using a structural group analysis method. The various functional groups were determined using a combination of proton NMR. carbon-13 NMR. IR. elemental analysis and nitrogen titration analysis. The liquefaction reactions in anthracene oil and in recycled product oil were compared on the basis of three solvent quality Indices and the predominant structural groups in the resulting liquids. The results show that major structural changes occur at both stages of liquefaction. Processing in anthracene oil showed much greater structural changes than liquefaction in the recycled product. The structural profiles Indicated a reduction in aromatic structures and a dramatic increase in aliphatic and naphthenic structures during processing in anthracene oil. These changes were attributed to the hydrogenation of aromatic structures and the dissolution of aliphatic ...