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- W2468051168 abstract "The yields and characteristics of products from mild temperature gasification or pyrolysis of coal have been evaluated extensively in fundamental and process development efforts. At 500{degrees}C, the following has been presented as representing the sulfur product distribution from US bituminous coals: (1) Total sulfur in gas = 0 31 x S{sub coal}. Total sulfur in tar = 0:06 x S{sub coal}. Total sulfur in solid = 0.61 x S{sub coal}. This type of distribution is affected by factors such as coal type, sulfur content and form, particle size, heating rates, temperature of pyrolysis, reactor and process design, and the type of reactants to which the coal is subjected. For example, increasing the pyrolysis residence time usually decreases the sulfur content in the char and increases the tar and gas yields and their sulfur content. As indicated above, and in other mild temperature gasification studies of low-to-high sulfur coals at temperatures between 400-825{degrees}C, the coal sulfur was distributed nonselectively to all products. As a consequence, the upgrading required to meet environmental regulations has to be applied to more diverse products than the coal from which the products were derived. The severity of such upgrading, and the severity to which coal hasmore » to be treated to release all of its sulfur, depends on the chemical form of the sulfur. Recent analytical efforts have begun to define these sulfur forms in coal, the most refractory organic species of which are thiophenic in nature. In the current study, the mild temperature pyrolysis of Illinois basin coals mixed with phosphoric acid under continuous-feed, bench-scale fluidized bed conditions at 500{degrees}C is reported. The extent of sulfur removal and its partitioning to gas as H{sub 2}S are discussed in relation to its chemical form in the coal. Swilling characteristics of coal/acid mixtures are also discussed relative to operation of the fluidized bed reactor.« less" @default.
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- W2468051168 date "1994-12-31" @default.
- W2468051168 modified "2023-09-24" @default.
- W2468051168 title "Chemical desulfurization of coal: Partitioning sulfur to gas as H{sub 2}S" @default.
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