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High Temperature Hydrogen Sulfide Removal With Tin Oxide
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Book Synopsis High Temperature Hydrogen Sulfide Removal with Tin Oxide by :
Download or read book High Temperature Hydrogen Sulfide Removal with Tin Oxide written by and published by . This book was released on 1993 with total page 15 pages. Available in PDF, EPUB and Kindle. Book excerpt: The system is based on the absorption of hydrogen sulfide (H2S) by stannic (tin) oxide. Two sorbents are required, the first sorbent is tin oxide and the second sorbent is a zinc oxide based material (i.e., zinc ferrite or zinc titanate) which is regenerated by air producing SO2. TDA's process carries out a modified Claus reaction to reduce the SO2 from the second sorbent generation to elemental sulfur. In this case the sulfided stannic oxide forms stannous sulfide (SnS) which reduces the SO2. The absorption by SnO2 could remove over 90% of the H2S from typical coal gas streams, but we use zinc ferrite (or zinc titanate), (a) to reduce H2S to less than 20 ppM and (b) as a source of SO2 in regeneration. Due to stoichiometry of regeneration we want to remove half of the H2S by SnO2 and the remainder by the second sorbent. The reactions with stannic oxide minimize the heat released during H2S removal and regeneration. The absorption by SnO2 is slightly endothermic and cools the gas stream by less that 5°F (2.8°C) during absorption. Regeneration with SO2 is exothermic but releases only 11% of the heat that is liberated in regenerating the ZnO. For a nominal 6.5:1 steam to air the regeneration of ZnO increases the temperature by (asymptotically equal to)400°F. The regeneration of SnO2 increases the temperature by less than 50°F (28°C) in the same gas flow.
Book Synopsis High Temperature Regenerable Hydrogen Sulfide Removal Agents by :
Download or read book High Temperature Regenerable Hydrogen Sulfide Removal Agents written by and published by . This book was released on 1993 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: A system for high temperature desulfurization of coal-derived gases using regenerable sorbents. One sorbent is stannic oxide (tin oxide, SnO.sub. 2), the other sorbent is a metal oxide or mixed metal oxide such as zinc ferrite (ZnFe.sub. 2 O.sub. 4). Certain otherwise undesirable by-products, including hydrogen sulfide (H.sub. 2 S) and sulfur dioxide (SO.sub. 2) are reused by the system, and elemental sulfur is produced in the regeneration reaction. A system for refabricating the sorbent pellets is also described.
Book Synopsis High Temperature Hydrogen Sulfide Removal with Stannic Oxide by :
Download or read book High Temperature Hydrogen Sulfide Removal with Stannic Oxide written by and published by . This book was released on 1994 with total page 16 pages. Available in PDF, EPUB and Kindle. Book excerpt: This contract focuses on the development of sorbents and processes for removal of H2S from hot coal gas with the product of sorbent regeneration being elemental sulfur. TDA Research's process uses a regenerable tin(IV) oxide-based (SnO2) sorbent as the first sorbent and zinc ferrite (or zinc titanate) as a second sorbent.
Book Synopsis High Temperature Hydrogen Sulfide Removal by :
Download or read book High Temperature Hydrogen Sulfide Removal written by and published by . This book was released on 1992 with total page 9 pages. Available in PDF, EPUB and Kindle. Book excerpt: The objective is to develop and test a regenerable stannic oxide-based sorbent to remove H[sub 2]S from hot coal gases while producing sulfur as the only product. The detailed technical objectives in support of this are: (1) Develop mechanically strong and chemically inert support materials which will retain their properties through multiple absorption regeneration cycles. (2) Develop mathematical models to predict the performance of large-scale systems from benchscale results. (3) Test the durability of the best sorbent/support combinations. (4) Conduct a bench-scale proof of concept test with the best stannic-oxide sorbent. Several approaches are being used to develop long-life sorbents. The investigators have tested sorbents produced by agglomeration, pressing, and extrusion. To date over 50 formulations have been tested, with several showing promise. Table II presents the results on five of these formulations; all of these formulations had surface areas in excess of 2 m[sup 2]/gm. All of the formulations meet the goals for porosity, tin content, and surface area. The crush strength for a 1/8inches dia. by 1/8inches long sorbent is significantly affected by the method of preparing the sorbent.
Book Synopsis High Temperature Hydrogen Sulfide Removal with an Iron Oxide-alumina Sorbent by : Mottlene Wang
Download or read book High Temperature Hydrogen Sulfide Removal with an Iron Oxide-alumina Sorbent written by Mottlene Wang and published by . This book was released on 1980 with total page 318 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Removing Hydrogen Sulfide from Synthesis Gas with Iron Oxide at Elevated Pressure by : Glenn E. Johnson
Download or read book Removing Hydrogen Sulfide from Synthesis Gas with Iron Oxide at Elevated Pressure written by Glenn E. Johnson and published by . This book was released on 1962 with total page 36 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis High-Temperature H2S Removal from IGCC Coarse Gas by : Jiang Wu
Download or read book High-Temperature H2S Removal from IGCC Coarse Gas written by Jiang Wu and published by Springer. This book was released on 2017-11-07 with total page 162 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book provides extensive information on high-temperature H2S removal for integrated gasification combined cycle (IGCC) coarse gas, together with briefly introductions to the concept of clean coal technology, and to the mechanism and kinetics of hot coal gas desulfurizers. Readers will gain a comprehensive understanding of available control methods for high-temperature H2S removal in IGCC coarse gas and how the technology has been adopted by industry. As such, the book offers a unique resource for researchers and engineers in the fields of energy science and technology, environmental science and technology, and chemical engineering.
Book Synopsis REMOVAL OF HYDROGEN SULFIDE BY REGENERABLE METAL OXIDE SORBENTS. by :
Download or read book REMOVAL OF HYDROGEN SULFIDE BY REGENERABLE METAL OXIDE SORBENTS. written by and published by . This book was released on 2004 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: ABSTRACT REMOVAL OF HYDROGEN SULFIDE BY REGENERABLE METAL OXIDE SORBENTS Karayýlan, Dilek M.S., Department of Chemical Engineering Supervisor : Prof. Dr. Timur Doðu Co-Supervisor: Prof. Dr. Gülþen Doðu June 2004, 166 pages High-temperature desulfurization of coal-derived fuel gases is an essential process in advanced power generation technologies. It may be accomplished by using metal oxide sorbents. Among the sorbents investigated CuO sorbent has received considerable attention. However, CuO in uncombined form is readily reduced to copper by the H2 and CO contained in fuel gases which lowers the desulfurization efficiency. To improve the performance of CuO-based sorbents, they have been combined with other metal oxides, forming metal oxide sorbents. Sulfidation experiments were carried out at 627 oC using a gas mixture composed of 1 % H2S and 10 % H2 in helium. Sorbent regeneration was carried out in the same reactor on sulfided samples at 700 oC using 6 % O2 in N2. Total flow rate of gas mixture was kept at 100 ml/min in most of the experiments. In this study, Cu-Mn-O, Cu-Mn-V-O and Cu-V-O sorbents were developed by using complexation method. Performance of prepared sorbents were investigated in a fixed-bed quartz microreactor over six sulfidation/regeneration cycles. During six cycles, sulfur retention capacity of Cu-Mn-O decreased slightly from 0.152 to 0.128 (g S)/(g of Sorbent) while some decrease from 0.110 to 0.054 (g S)/(g of Sorbent) was observed with Cu-Mn-V-O. Cu-V-O showed a very good performance in the first sulfidation and excessive thermal sintering in the first regeneration prevented further testing. Sulfur retention capacity of Cu-V-O was calculated as 0.123 (g S)/(g of Sorbent) at the end of the first sulfidation. In addition, SO2 formation in sulfidation experiments was observed only with Cu-V-O sorbent.
Book Synopsis Reactivity of Metal Oxide Sorbents in the Removal of Hot Hydrogen Sulfide by : Kyung C. Kwon
Download or read book Reactivity of Metal Oxide Sorbents in the Removal of Hot Hydrogen Sulfide written by Kyung C. Kwon and published by . This book was released on 2000 with total page 10 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Steam-regenerative Removal of H2S at High Temperatures Using Metal Oxide on Aluminia Acceptors by : Tatang Hernas Soerawidjaja
Download or read book Steam-regenerative Removal of H2S at High Temperatures Using Metal Oxide on Aluminia Acceptors written by Tatang Hernas Soerawidjaja and published by . This book was released on 1985 with total page 156 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Removal of Hydrogen Sulfide from Hot Producer Gas by Solid Absorbents by : William T. Abel
Download or read book Removal of Hydrogen Sulfide from Hot Producer Gas by Solid Absorbents written by William T. Abel and published by . This book was released on 1974 with total page 14 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Method of Removing Hydrogen Sulfide from Gases Utilizing a Zinc Oxide Sorbent and Regenerating the Sorbent by :
Download or read book Method of Removing Hydrogen Sulfide from Gases Utilizing a Zinc Oxide Sorbent and Regenerating the Sorbent written by and published by . This book was released on 1984 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: A spent solid sorbent resulting from the removal of hydrogen sulfide from a fuel gas flow is regenerated with a steam-air mixture. The mixture of steam and air may also include additional nitrogen or carbon dioxide. The gas mixture contacts the spent sorbent containing metal sulfide at a temperature above 500.degree. C. to regenerate the sulfide to metal oxide or carbonate. Various metal species including the period four transition metals and the lanthanides are suitable sorbents that may be regenerated by this method. In addition, the introduction of carbon dioxide gas permits carbonates such as those of strontium, barium and calcium to be regenerated. The steam permits regeneration of spent sorbent without formation of metal sulfate. Moreover, the regeneration will proceed with low oxygen concentrations and will occur without the increase in temperature to minimize the risk of sintering and densification of the sorbent.
Download or read book Energy Research Abstracts written by and published by . This book was released on 1995 with total page 782 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Sulfidization of Tin Oxide and Volatilization of Tin Sulfide by : Hillary W. St. Clair
Download or read book Sulfidization of Tin Oxide and Volatilization of Tin Sulfide written by Hillary W. St. Clair and published by . This book was released on 1954 with total page 32 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Desulfurization of Hot Coal Gas by : Aysel T. Atimtay
Download or read book Desulfurization of Hot Coal Gas written by Aysel T. Atimtay and published by Springer Science & Business Media. This book was released on 2013-06-29 with total page 409 pages. Available in PDF, EPUB and Kindle. Book excerpt: Economic and environmental requirements for advanced power generating systems demand the removal of corrosive and other sulfurous compounds from hot coal gas. After a brief account of the world energy resources and an overview of clean coal technologies, a review of regenerable metal oxide sorbents for cleaning the hot gas is provided. Zinc oxide, copper oxide, calcium oxide, manganese oxide based as well as supported and mixed metal oxide sorbents are treated. Performance analysis of these sorbents, effects of various parameters on the desulfurization efficiency, kinetics of sulfidation and regeneration reactions, sulfiding and regeneration mechanisms are discussed. Two chapters present recent results in the direct production of elemental sulfur from regeneration or SO2-rich gases.
Book Synopsis Reactivity of Metal Oxide Sorbents for Removal of H2S. by :
Download or read book Reactivity of Metal Oxide Sorbents for Removal of H2S. written by and published by . This book was released on 1996 with total page 12 pages. Available in PDF, EPUB and Kindle. Book excerpt: Removal of hydrogen sulfide contained in hot coal gases produced from integrated gasification combined cycle power generation systems is required to protect downstream combustion turbines from being corroded with sulfur compounds. Removal of sulfur compounds from hot coal gas products is investigated by using various metal oxide sorbents and membrane separation methods. The main requirements of these metal oxide sorbents are durability and high sulfur loading capacity during absorption-regeneration cycles. In this research, durable metal oxide sorbents were formulated. Reactivity of the formulated metal oxide sorbents with simulated coal gas mixtures was examined to search for an ideal sorbent formulation with a high-sulfur loading capacity suitable for removal of hydrogen sulfide from coal gases. The main objectives of this research are to formulate durable metal oxide sorbents with high-sulfur loading capacity by a physical mixing method, to investigate reaction kinetics on the removal of sulfur compounds from coal gases at high temperature and pressure, to study reaction kinetics on the regeneration of sulfided sorbents, to identify effects of hydrogen partial pressures and moisture on equilibrium/dynamic absorption of hydrogen sulfide into formulated metal oxide sorbents as well as initial reaction rates of H2S with formulated metal oxide sorbents, and to evaluate intraparticular diffusivity of H2S into formulated sorbents at various reaction conditions. The metal oxide sorbents such as TU-1, TU-19, TU-24, TU-25 and TU-28 were formulated with zinc oxide powder as an active sorbent ingredient, bentonite as a binding material and titanium oxide as a supporting metal oxide.
Book Synopsis High Temperature H2S Adsorption Using Copper-titanate Nanoparticles by : Farzad Yazdanbakhsh
Download or read book High Temperature H2S Adsorption Using Copper-titanate Nanoparticles written by Farzad Yazdanbakhsh and published by . This book was released on 2015 with total page 122 pages. Available in PDF, EPUB and Kindle. Book excerpt: Direct desulfuization of syngas is an important measure to further increase the efficiency of IGCC systems. Solid-phase, metal oxide adsorbents which sequester the sulfur by converting H2S to a metal sulfide are the only desulfurization technology capable of withstanding the combustion temperatures present at the outlet of the gasifier. Copper oxide is of particular interest due to its favourable thermodynamics across a wide range of temperatures. Cu-ETS-2 is a copper exchanged form of the sodium titanate ETS-2 and functions analogously to CuO for the conversion of H2S into CuS at temperatures ranging from ambient to 950 °C. The results of this study show that Cu-ETS-2 is capable of removing H2S from H2S/He mixture to concentrations below a mass spectrometer's detection limit at temperatures as high as 950°C. Temperature is, however, only one of the challenges facing a direct-desulfurization adsorbent; high concentrations of H2 and water vapour are present in the syngas stream which can influence the oxidation state of the metal and the efficiency of H2S removal. In an attempt to prevent reduction of CuO, Chromium was successfully used to stabilize the oxidation state of copper oxide and maintain constant adsorption capacity throughout the whole temperature range. While several studies have examined the effect hydrogen in the feed, there are few studies exploring the influence of water vapour on the efficiency of H2S removal and none that explore the effect of water vapour at elevated temperatures. This study can be considered the only study to investigate the influence of water vapour on the desulfurization of a dilute H2S stream at temperatures between 350 and 950 °C using copper oxide-based adsorbents. The findings demonstrate that the presence of water vapor promotes production of H2, resulting in faster reduction of CuO to Cu2O and elemental copper, leading to less adsorption capacity. In the final chapter, the ability of the adsorbent for regeneration and use as a multi-cycle adsorbent was investigated. The results indicate that the adsorbent is capable of regeneration for at least four times with no sign of reduction in capacity. The results also indicate that the exothermic nature of oxidation reaction results in temperatures up to ~1700°C causing the partial melting of the quartz glass tube. However the adsorbent can withstand such high temperatures and does not lose adsorption capacity after the first oxidation step. This phenomenon is due to having nanotitanate ETS-2 as the support in the adsorbent.
