2 edition of Effect of trace metals and sulfite oxidation on adipic acid degradation in FGD systems found in the catalog.
Effect of trace metals and sulfite oxidation on adipic acid degradation in FGD systems
J. B Jarvis
by U.S. Environmental Protection Agency, Industrial Environmental Research Laboratory, Center for Environmental Research Information [distributor] in Research Triangle Park, NC, Cincinnati, OH
Written in English
|Contributions||Industrial Environmental Research Laboratory (Research Triangle Park, N.C.)|
|The Physical Object|
|Pagination||5 p. :|
CaSO3 with the other two major FGD components, i.e. CaCO3 and fly ash, in inhibiting acid production in coal refuse; and (3) the inhibitory effect of CaSO3 ‐‐ based FGD on acid leaching. Materials and Methods Fresh (unweathered) coal refuse, FGD, and fly ash were obtained from the American Electric Power Plant (Coshocton, Ohio). Content: Thermodynamic values for desulfurization processes / Leo Brewer --Reliable data for flue gas desulfurization processes / Bert R. Staples --Use of Pitzer's equations to estimate strong-electrolyte activity coefficients in aqueous flue gas desulfurization processes / Gerd M. Rosenblatt --Limestone dissolution: effects of pH, CO₂, and buffers modeled by mass transfer / Pui K. Chan and.
Direct Measurement of Sulfide Mineral Oxidation Rates and Acid Rock Drainage in Wall Rock of Open Pit Mines1 Houston Kempton2, David Atkins3 2Watershed Environmental, Boulder, CO, USA, [email protected] 3Watershed Environmental, Boulder, CO, USA, [email protected] ABSTRACT Oxidation of sulfide minerals exposed in the walls of open pit hard-rock mines. Exp. 8: Oxidation: Preparation of Adipic Acid Pre-lab: 1. Balance the following main equation (in the introduction section) using the half-reaction method. (See your notes or CHEM text, pages ) Show all your work at the beginning of the pre-lab write up. Whether you may get.
A forced oxidation limestone system has been projected as a more attractive option compared to a natural oxidation system because of improved sludge disposal operations; however, soluble alkalinity can limit the SO2 removal performance of limestone systems, and inorganic additives such as magnesium are ineffective in forced oxidized operations because of their low dissolved sulfite concentrations Alter- natively, adipic acid addition is effective in increasing soluble alkalinity . Acidithiobacillus spp. are prevalent in acid mines due to their capabilities of utilizing the sulfur and iron in ores and adapting to extremely acidic environments. As a consequence, Acidithiobacillus spp. have become the most active bacteria used in the biohydrometallurgy industry in bioleaching or biomining, whereby metals are extracted from ores through microbial oxidation Cited by:
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United States Environmental Protection Agency Industrial Environmental Research Laboratory Research Triangle Park NC Research and Development EPA/S March Project Summary Effect of Trace Metals and Sulfite Oxidation on Adipic Acid Degradation in FGD Systems J, B.
Jarvis The adipic acid degradation rate was measured in a bench-scale flue gas desulfurization (FGO). Results show that the adipic acid degradation rate depends on the sulfite oxidation rate, the adipic acid concentration, the presence of manganese in solution, and temperature.
The degradation rate is also affected by pH, but only when manganese is present. Effect of trace metals and sulfite oxidation on adipic acid degradation in FGD systems Author: J B Jarvis ; Industrial Environmental Research Laboratory (Research Triangle Park, N.C.).
The addition of adipic acid to FGD scrubber liquor results in improved limestone utilization and enhanced SO2 sorption kinetics. During scrubber operation, however, adipic acid is lost from the system in the liquid and solid phase purge streams and by chemical degradation.
In order to assess the effects of scrubber operating parameters on the loss of adipic acid, a series of laboratory tests.
The value of adipic acidas a scrubber additive has been suggested in a theoretical analysis byRochelle (1). Adipic acid has the effect of buffering scrubber solutions,thereby enhancing liquid phase mass transfer.
Improved SOz removal can beachieved economically due to the relatively low price of adipic acid. At first, conjugated organic acid buffer degradation, such as adipic acid, was observed under forced oxidation of sulfite in FGD, and therefore organic buffer for maintaining solution acidity of the metal-sulfite systems may not be effective.
Secondly, some organic acids can tightly bind transition metal ions, and prevent their complexation Cited by: Results show that the adipic acid degradation rate depends on the sulfite oxidation rate, the adipic acid concentration, the presence of manganese in solution, and temperature.
Catalytic effects of nine organic acids on the oxidation of sulfite were compared, in which peracetic acid was the most effective. The intrinsic oxidation kinetics of sodium sulfite catalyzed by peracetic acid were studied using intermittent apparatus, and reaction orders of the reagents and activation energy by: Sodium alkali desulphurization is a promising method, in which sulfite oxidation is of great importance.
In the present work, Effect of several inhibitors on the oxidation rate of sodium sulfite was compared in a gas-liquid reactor. The results indicate that PT, a novel and nontoxic additive, is by: 5. 1 Influence of dissolved metals and oxidative degradation inhibitors on the oxidative and thermal degradation of monoethanolamine in post-combustion CO 2 capture Grégoire Léonard a,*, Alexander Voice b, Dominique Toye a, Georges Heyen a aDepartment of Applied Chemistry, University of Liège, Allée de la chimie B6a, Liège Sart Tilman,Belgium.
Oxidation of aqueous hydrogen sulfide at pH (acetate) by traditional outer-sphere oxidants such as [IrCl 6] 2− and [Ru(NH 3) 5 isn] 3+ is highly sensitive to trace metal-ion catalysis, with copper being highly effective.
Typical metal-ion impurity levels are sufficient to dominate the by: 9. A laboratory-scale well-mixed thermostatic reactor with continuously blasting air was used to investigate the oxidation inhibition of sulfite in dual alkali flue gas desulfurization (FGD) system.
The effects of operating parameters such as pH value and catalyst concentration on the oxidation were by: Shen et al. () studied the kinetics and mechanism of sulfite oxidation in the magnesium-based wet FGD process.
Kang () studied the effect of pyrolysis temperature on the activity of MgO. The influence on the degradation rate of adipic acid was studied: The concentration of adipic acid (0– mg/l), trace-metals, Cl− (0–50 g/l), pH ( and ), and temperature (32, 42 and.
Abstract. The sulfhydryl-containing amino acids, Met and Cys, are needed by all life forms for protein synthesis and a myriad other tasks. Under the oxidizing conditions found over most of this planet, sulfur is present in the geosphere in the form of by: 2.
Dissolution kinetics of sorbents and effect of additives in wet flue gas desulfurization and observed similar effects as adipic acid on limestone Moser R. Prospects for inhibited oxidation. Consequently, most of the mechanistic chemistry of these metal sulfides is associated with oxidation of the sulfur species, and we refer to the reactions as “oxidative dissolution” to emphasize that oxidation must occur in order to dissolve at an appreciable rate.
Because sulfur can be present in a number of different forms (sulfur, sulfite. The oxidation rate of sulfite was much higher than the rate of the Hill reaction. In addition, inhibition by several sugars indicates that the oxidation of sulfite proceeds as a chain reaction.
Although catalase did not affect the reaction, ferredoxin plus NADP, cyto- chrome c and superoxide dismutase prevented the oxidation of sulfite. We thus Cited by: Sulfite Oxidation in Organic Acid Solutions.
NURMI, J. OVERMAN, J. ERWIN, and Laboratory Investigation of Adipic Acid Degradation in Flue Gas Desulfurization Scrubbers. TERRY, J. JARVIS, D. UTLEY, and Adipic Acid-Enhanced Lime/Limestone Test Results at the EPA Alkali Scrubbing Test Facility. The first leaching step is the release of trace metals from the mineral phase due to sulfide oxidation.
Sulfate was the ultimate reaction product in both the laboratory and the field, a result of the pH and oxidizing conditions which prevailed, and the relatively long reaction time. The rate of sulfide oxidation observed in batch reactors was a function of available sulfide surface area.
Organic acid such acetic, adipic acid, glutaric acid, dibasic acid e.t.c have been used in wet flue gas desulphurisation because they can buffer the pH of gas/liquid interface and pH of the bulk.evaluate iron sulfide oxidation and the reactions of A13+, FeS+, Fe2+, and SO,*- under conditions of high leaching, (2) determine the composition of acid mine drainage under such conditions, and (3) utilize chem- ical equations to understand the management of geo- logic materials containing iron Size: KB.Organic acid degradation conjugated with sulfite oxidation has been studied under flue gas desulfurization (EGD) conditions.
The oxidative degradation constant, k/sub 12/, is defined as the ratio of organic acid degradation rate and sulfite oxidation rate after being normalized by the concentrations of organic acid and dissolved S(IV).