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The Kinetics Of Sulfation Of Calcium Oxide Quarterly Report No 4 December 1 1989 February 28 1990
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Book Synopsis The Kinetics of Sulfation of Calcium Oxide. [Quarterly] Report No. 4, December 1, 1989--February 28, 1990 by :
Download or read book The Kinetics of Sulfation of Calcium Oxide. [Quarterly] Report No. 4, December 1, 1989--February 28, 1990 written by and published by . This book was released on 1990 with total page 32 pages. Available in PDF, EPUB and Kindle. Book excerpt: The objectives of this study are to determine the intrinsic kinetics and the product layer diffusion rate by minimizing the resistances to gas-phase pore diffusion, and eliminating complications due to pore filling. In the report, a grain model was used to introduce the various potentially rate-limiting processes. It was compared with results obtained with a distributed pore model by Bhatia & Perlmutter (1981). Comparing the predicted behavior of the surface areas with conversion, it was even possible to compare experimental results with other models. The conclusion of this study was that, even thought the kinetic parameters obtained with different samples differed much more if product layer diffusion assumed rate-limiting rather than the surface reaction, the shape of the predicted curve approached the experimental findings so much better, that product layer diffusion is indeed most likely to be rate-limiting. (VC).
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Book Synopsis The Kinetics of Sulfation of Calcium Oxide. [Quarterly] Project Status Report, June 1, 1989--August 31, 1989 by :
Download or read book The Kinetics of Sulfation of Calcium Oxide. [Quarterly] Project Status Report, June 1, 1989--August 31, 1989 written by and published by . This book was released on 1989 with total page 20 pages. Available in PDF, EPUB and Kindle. Book excerpt: Studies of the sulfation rate behavior show an initial fast rate followed by a rate decrease. This behavior has generally been interpreted as product layer diffusion limitations taking over after an initial kinetic rate regime. Many investigators tried to model this observed rate change, more or less successfully. No agreement has been reached, however, as to the value of the product layer diffusivity. In this work we want to investigate the mechanism of this process. During the last quarter, most attention has been paid to analyzing the results obtained earlier. In the light of some unexpected results, we returned to the most fundamental question: what is the rate-limiting mechanism? It appeared that whatever the mechanism is, no rate ''constant'' could be used, since the rate is a function of the product layer composition, which changes during the reaction. When comparing the results obtained with different samples, however, it appeared that the best correlation was found if one assumes the limiting rate to occur at the CaSO4 interphase. This point of view has never been presented before and requires therefore a more attentive analysis.
Book Synopsis The Kinetics of Sulfation of Calcium Oxide. [Quarterly] Report No. 3, September 1, 1989--November 30, 1989 by :
Download or read book The Kinetics of Sulfation of Calcium Oxide. [Quarterly] Report No. 3, September 1, 1989--November 30, 1989 written by and published by . This book was released on 1989 with total page 24 pages. Available in PDF, EPUB and Kindle. Book excerpt: Studies of the sulfation rate behavior show an initial fast rate followed by a rate decrease. This behavior has generally been interpreted as product layer diffusion limitations taking over after an initial kinetic rate regime. Many investigators tried to model this observed rate change. As pore diffusion was a limiting phenomenon in most of the experiments, authors have used several pore models to described this complication, more or less successfully. Product layer diffusivity has been assumed to be constant as conversion increased; however, there is no general agreement as to its value. In this work we are investigating the mechanism of this process with emphasis on measurement of product layer diffusivity and the surface reaction rate. Some additional experimental work was done to investigate the order and activation energy of the sulfation under different conditions. The effect of additives was studied again, by sprinkling some KCl or NaCl salt on top of partially reacted synthetic lime, in an effort to change the surface reaction rate rather than the diffusion rate.
Book Synopsis The Kinetics of Sulfation of Calcium Oxide. [Quarterly] Project Status Report, February 27, 1989--May 31, 1989 by :
Download or read book The Kinetics of Sulfation of Calcium Oxide. [Quarterly] Project Status Report, February 27, 1989--May 31, 1989 written by and published by . This book was released on 1989 with total page 33 pages. Available in PDF, EPUB and Kindle. Book excerpt: Studies of the sulfation rate behavior show an initial fast rate followed by a rate decrease. It is generally agreed that product layer diffusion limitations are the explanation for this behavior. Many investigators tried to model this observed rate change, more or less successfully. No agreement has been reached, however, as to the value of the produce layer diffusivity. Hence, in this work we want to investigate the mechanism of this process. In addition to understanding the initial kinetics, two questions will be focused on. First, we should understand what is diffusing. It appears that the driving force for this diffusion phenomenon is not first order with the SO2 concentration in the gas. This would indicate that some other, intermediary step is occurring. The second question concerns the composition of the product layer. Different conditions at the start of the reaction were observed to produce different diffusion rates at a later stage. The microscopic appearance of the product layer also appeared to be different.
Book Synopsis Government Reports Annual Index by :
Download or read book Government Reports Annual Index written by and published by . This book was released on 1994 with total page 1190 pages. Available in PDF, EPUB and Kindle. Book excerpt: Sections 1-2. Keyword Index.--Section 3. Personal author index.--Section 4. Corporate author index.-- Section 5. Contract/grant number index, NTIS order/report number index 1-E.--Section 6. NTIS order/report number index F-Z.
Book Synopsis Government Reports Announcements & Index by :
Download or read book Government Reports Announcements & Index written by and published by . This book was released on 1993 with total page 688 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis The Kinetics of Sulfation of Calcium Oxide. [Quarterly] Project Status Report, March 1, 1990--May 31, 1990 by :
Download or read book The Kinetics of Sulfation of Calcium Oxide. [Quarterly] Project Status Report, March 1, 1990--May 31, 1990 written by and published by . This book was released on 1990 with total page 52 pages. Available in PDF, EPUB and Kindle. Book excerpt: The rate of sulfation of a CaO surface is rapid at first, limited by the intrinsic kinetics, but slows down with increasing conversion as a consequence of the increased resistance to diffusion through the product layer. The objectives of this study are to determine the intrinsic kinetics and the product layer diffusion pate by minimizing the resistances to gas-phase pore diffusion, and eliminating complications due to pore filling. This is achieved by the use of nonporous CaO. A wide range of particle sizes are used to change the relative importance of the regimes in which the intrinsic kinetics and product layer diffusion control. The assumption of constant product layer diffusivity can then be tested and the variables that determine this diffusivity independently studied. Information on product layer diffusion can also be obtained from studies of porous particles after the pore mouths are all plugged and a uniform surface coating is obtained. This information on diffusion rate and intrinsic reactivity can then be combined with a geometrical model to describe the rate of reaction over the entire range of conversions and is particularly useful in treating the effect of particle size on conversion history.
Book Synopsis The Kinetics of Sulfation of Calcium Oxide by : Adel F. Sarofim
Download or read book The Kinetics of Sulfation of Calcium Oxide written by Adel F. Sarofim and published by . This book was released on 1990 with total page 50 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis The Kinetics of Sulfation of Calcium Oxide by :
Download or read book The Kinetics of Sulfation of Calcium Oxide written by and published by . This book was released on 1989 with total page 20 pages. Available in PDF, EPUB and Kindle. Book excerpt: Studies of the sulfation rate behavior show an initial fast rate followed by a rate decrease. This behavior has generally been interpreted as product layer diffusion limitations taking over after an initial kinetic rate regime. Many investigators tried to model this observed rate change, more or less successfully. No agreement has been reached, however, as to the value of the product layer diffusivity. In this work we want to investigate the mechanism of this process. During the last quarter, most attention has been paid to analyzing the results obtained earlier. In the light of some unexpected results, we returned to the most fundamental question: what is the rate-limiting mechanism It appeared that whatever the mechanism is, no rate constant'' could be used, since the rate is a function of the product layer composition, which changes during the reaction. When comparing the results obtained with different samples, however, it appeared that the best correlation was found if one assumes the limiting rate to occur at the CaSO4 interphase. This point of view has never been presented before and requires therefore a more attentive analysis.
Download or read book Energy Information Abstracts written by and published by . This book was released on 1990 with total page 1312 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Flue Gas Desulfurization and Industrial Minerals by : M. Michael Miller
Download or read book Flue Gas Desulfurization and Industrial Minerals written by M. Michael Miller and published by . This book was released on 1993 with total page 720 pages. Available in PDF, EPUB and Kindle. Book excerpt: Contains 4,101 references on FGD [Flue Gas Desulfurization] ... primarily from 1982 through June 1993. Complements the "Flue Gas Desulfurization and Denitrification" bibliography published by the U.S. Dept. of Energy in Jan. 1985. References were located on the Energy, Science and Technology, Pollution Abstracts, and Environmental Bibliography databases. Primarily covers FGD and the use of industrial minerals in the desulfurization process or in by-product utilization and disposal. Emphasizes post-combustion removal of sulfur dioxide through processes such as in-duct injection and wet and dry scrubbing.
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Book Synopsis The Sulfation of Limestone and Calcium Oxide by : Michael Jeffrey Hegarty Snow
Download or read book The Sulfation of Limestone and Calcium Oxide written by Michael Jeffrey Hegarty Snow and published by . This book was released on 1985 with total page 626 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Sulfation of Nonporous Calcium Oxide by : Jean Baptiste Charles de Hemptinne
Download or read book Sulfation of Nonporous Calcium Oxide written by Jean Baptiste Charles de Hemptinne and published by . This book was released on 1990 with total page 472 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Toxicological Profile for Sulfur Trioxide and Sulfuric Acid by :
Download or read book Toxicological Profile for Sulfur Trioxide and Sulfuric Acid written by and published by . This book was released on 1998 with total page 220 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Toxicological Profile for Carbon Disulfide by :
Download or read book Toxicological Profile for Carbon Disulfide written by and published by . This book was released on 1994 with total page 236 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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