Hydrogen Separation by Ceramic Membranes in Coal Gasification. Quarterly Progress Report, April 1, 1992--June 30, 1992 PDF Download
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Languages : en
Pages : 3
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Project objectives are to develop hydrogen-permselective ceramic membranes for water-gas shift membrane-reactor suitable for hydrogen production from coal gas, and to evaluate the technical and economic potential of the membrane-reactor. Work performed during reporting period included membrane deposition and stability testing.
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Category :
Languages : en
Pages : 3
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Book Description
Project objectives are to develop hydrogen-permselective ceramic membranes for water-gas shift membrane-reactor suitable for hydrogen production from coal gas, and to evaluate the technical and economic potential of the membrane-reactor. Work performed during reporting period included membrane deposition and stability testing.
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Category : Power resources
Languages : en
Pages : 782
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Category :
Languages : en
Pages : 4
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Project Objectives are to develop hydrogen-permselective ceramic membranes for water-gas shift membrane-reactor suitable for hydrogen production from coal gas and evaluate the technical and economic potential of the membrane-reactor. During the reporting period exploratory experiments begun on a membrane preparation technique aimed at providing higher membrane permeance. The new preparation technique involves two stages. The first stage is the formation of a layer of silica gel by a two-phase interfacial reaction within the pores of the substrate. The gel is then dried and calcined yielding a microporous (pore diameter below 10 Å) silica layer within the pores of the substrate tube. The second stage involves one-sided chemical vapor deposition using the SiCl4-H2O reaction to close up the micropores of the gel layer and produce the final hydrogen permselective membrane. Chemical reactions involved are described.
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Category :
Languages : en
Pages : 1190
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Category : Science
Languages : en
Pages : 848
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Category :
Languages : en
Pages : 39
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High temperature membrane separation techniques have been applied to gas mixtures involved in coal utilization. For coal gasification, H2S has been removed from the syn-gas stream, split into hydrogen which enriches the syn-gas, and sulfur which can be condensed from an inert gas sweep stream. For coal combustion, SO2 has been separated from the flue gas, with concentrated SO3 produced as a by-product. Both processes appear economically viable but each requires fundamental improvements: both the H2S cell and the SO2 cell require more efficient membranes and the H2S cell needs a more efficient anode. Membranes will be fabricated by either hot-pressing, impregnation of sintered bodies, or tape casting. Research conducted during the present quarter is highlighted, with an emphasis on progress towards these goals.
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Languages : en
Pages : 53
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Work has continued on application of this technology to polishing H2S from simulated coal gasification process streams. Both stainless steel and MACOR housings were successfully used, with 98% (100 ppmv H2S to 2 ppmv H2S) removal observed at a flow rate of 230 cc/min and a process temperature of 700°C with stainless steel housings (Run 57) and greater than 80% (11 ppmv H2S to less than 2 ppmv H2S) at a flow rate of 100 cc/min and a temperature of 650°C with MACOR housings (Run 65). Work has continued with attempts to increase removal efficiency by increasing the density of the membrane and slowing down H2 diffusion from the cathode side to the anode side of the cell.
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Languages : en
Pages : 8
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Experimentation with a rigidized, electrolyte filled tile, left much to be desired. The instability of the tiles at molten conditions (> 550°C), provided the necessary mechanism for H2 to penetrate the membrane. Once H2 cross-over occurs the entire objective of electrochemical separation becomes nullified. The Zircar membranes used last quarter provided excellent protection against H2, prompting a reversion back to them. If porosities are strictly adhered to and the water-gas shift is properly handled, the membranes should provide an adequate mechanism for selective H2S removal.
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Category :
Languages : en
Pages : 98
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The general objective of this project was to develop hydrogen permselective membranes for hydrogen production from coal gas. The project consisted of the following tasks: (i) membrane preparation and characterization, (ii) membrane stability testing, and (iii) analysis and economic evaluation of a membrane-assisted ammonia from coal process. Several oxides (SiO2, TiO2, Al2O3, B2O3) in dense (or nonporous) form were identified to be permselective to hydrogen at elevated temperatures. To obtain reasonable permeance it is necessary that the membrane consists of a thin selective layer of the dense oxide supported on or within the pores of a porous support tube (or plate). Early in the project we chose porous Vycor tubes (5mm ID, 7 mm OD, 40 Å mean pore diameter) supplied by Corning Inc. as the membrane support. To form the permselective layer (SiO2, TiO2, Al2O3, B2O3) we employed chemical vapor deposition using the reaction of the chloride (SiCl4, etc.) vapor and water vapor at high temperatures. Deposition of the selective layer was carried out in a simple concentric tube reactor comprising the porous support tube surrounded by a wider concentric quartz tube and placed in an electrically heated split tube furnace. In one deposition geometry (the opposing reactants or two-sided geometry) the chloride vapor in nitrogen carrier was passed through the inner tube while the water vapor also in nitrogen carrier was passed in the same direction through the annulus between the two tubes. In the other (two-sided) geometry the chloride-containing stream and the water-containing stream were both passed through the inner tube or both through the annulus.
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Category :
Languages : en
Pages : 34
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Book Description
High temperature membrane separation techniques have been applied to gas mixtures involved in coal utilization. For coal gasification, H2S has been removed from the syn-gas stream, split into hydrogen, which enriches the syn-gas, and sulfur, which can be condensed from an inert gas sweep stream. For coal combustion, SO2 has been separated from the flue gas, with concentrated SO3 produced as a by-product. Both processes appear economically viable but each requires fundamental improvements: both the H2S cell and the SO2 cell require more efficient membranes and the H2S cell needs a more efficient anode. Membranes will be fabricated by either hot-pressing, impregnation of sintered bodies or tape casting. Research conducted during the present quarter is highlighted, with an emphasis on progress towards these goals.
