Absorption in aqueous

This reaction serves as a known model reaction to characterize mass transfer efficiency in micro reactors [7]. As it is a very fast reaction, mass transfer can be analysed solely The analysis can be done simply by monitoring color changes from pH indicators. Ammonia absorption in aqueous acidic solutions generally is even faster than carbon dioxide absorption in alkaline solutions. 

ATS [Ammonium thiosulfate] A process for removing residual sulfur dioxide from Claus tail gas by absorption in aqueous ammonia to produce ammonium sulfite and bisulfite. Addition of hydrogen sulfide from the Claus unit produces saleable ammonium thiosulfate. Developed by the Pritchard Corporation and first operated by the Colorado Interstate Gas Company at Table Rock, WY. 

Collin A process for removing hydrogen sulfide from coal gas by absorption in aqueous ammonia. The hydrogen sulfide was regenerated and used for making sulfuric acid. Invented by F. Collin in 1940 and operated in England and Europe in the 1950s. 

Konox A process for removing hydrogen sulfide from industrial gases by absorption in aqueous sodium ferrate (Na2Fe04) solution. The ferrate is reduced to ferrite (NaFe02) and the sulfide is oxidized to elemental sulfur. The main reactions are ... 

SNPA-DEA A process for removing hydrogen sulfide and carbon dioxide from gas streams by absorption in aqueous diethanolamine. Developed by the Societe Nationale des Petroles d Aquitaine at the gasfield in Lacq, France, and still used there and in Canada. 

Using an industrial oxidation reaction and carbon dioxide absorption in aqueous alkaline solutions, it was validated in some sets of process conditions that such pilot reactors show similar performance as their... 

Al-Ghawas, H.A., Hagewiesche, D.P., Ruiz-lbanez, G., and Sandall, O.C. Physicochemical properties important for carbon dioxide absorption in aqueous methyldiethanolamine, /. Chem. Eng. Data, 34(4) 385-391, 1989. 

Table XXX.—Percentage Conversion op Nitrogen Peroxide to Nitric Acid by Absorption in Aqueous Soln. op Nitric Acid at Atmospheric Pressure.

The method is dependent upon the production of an intensely fluorescent fluorophor which provides the basis for a rapid and sensitive assay of methyl isocyanate after collection on the adsorbent. Monomethyl amine, which is the only known interference, can be eliminated by absorption in aqueous solution of cupric chloride. 

Creep, compared with that of other TPs, is very low at elevated temperatures and under certain continuous loads. For example, its creep at 99C (21 OF) is less than that of acetal or heat resistant ABS at room temperature. Hydrolytic stability of these materials makes them resistant to water absorption in aqueous acidic and alkaline environments. Their combination of hydrolytic stability and heat resistance... 

COMBISULF A process for removing sulfur compounds from the gases from combined-cycle power plants with integrated coal gasification. Carbonyl sulfide is removed by catalytic hydrolysis, hydrogen sulfide is removed by selective absorption in aqueous MEDA, and the sulfur is recovered from both processes by a modified Claus unit. Developed by Krupp Koppers and first operated in Spain in 1996. See PRENFLO. 

Hondo HS-100 A process for removing acid gases from hydrocarbon gas streams by absorption in aqueous potassium nitrite. Developed by Hondo Chemicals. See also Sulfa-Check. 

Hoff KA, Juliassen O, Falk-Pedersen O, and Svendsen HF, Modeling and experimental study of carbon dioxide absorption in aqueous alkanolamine solutions using a membrane contactor. Industrial and Engineering Chemistry Research 2004, 43(16), 4908 921. 

The absorption in aqueous solution is slightly higher ( ) than in methanol. Around 245 nm, type B compounds only show non-specifically increasing absorption with decreasing UV wavelength but no marked band as described for type A. 

Develtroment of Thermodraamic Model for Physical and ChemicalEquilibriuin The first and perhaps most important step in the development of the thermodynamic model is the speciation, or representation of the set of chemical reactions. For CO2 absorption in aqueous MEA solutions, the set of reactions is... 

Method of purification Extractive distillation in the presence of furfural, absorption in aqueous cuprous ammonium acetate, or use of acetonitrile. 

B. Skrbic, J. Cvejanov, and R. Paunovic, A... Cas-Liquid Equilibrium-Model for Sulfur-Dioxide Absorption in Aqueous Sodium-Citrate Solution. Chem. Eng. Sci. 46 (12), 3314-3317 (1991). 

A minor variant to the amine scrubbing process described above is the Sulfinol process, which still uses an alkanolamine base, diisopropanolamine (35%), but in a solvent consisting of a mixture of sulfolane (40%), tetramethy-lene sulfone (CH2)4S02, a good hydrogen sulfide solvent) and water [29]. Other processes are based on hydrogen sulfide absorption in aqueous alkaline carbonate solutions, such as the Catacarb and Benfield systems (Eqs. 9.16 and 9.17). 

W14. Weber, G., and Laurence, D. J. R., Fluorescent indicators of absorption in aqueous solution and on the solid phase. Biochem. J. 66, xxxi (1954). 

The rate of oxygen absorption in aqueous Na2S is assumed to be... 

Using xanthone as the sensitizer, Navaratnam et al. (1985) calculated the molar absorption coefficient of benoxaprofen triplet-triplet absorption in aqueous solution at 410 nm as 17,500 dm3 mol1 cm. In this case this simple treatment was possible because... 

The chemical method used to estimate the interfacial area is based on the theory of the enhancement factor for gas absorption accompanied with a chemical reaction. It is clear from Equations 6.22 to 6.24 that, in the range where y> 5, the gas absorption rate per unit area of gas-liquid interface becomes independent of the liquid phase mass transfer coefficient kL, and is given by Equation 6.24. Such criteria can be met in the case of absorption with an approximately pseudo first-order reaction with respect to the concentration of the absorbed gas component. Reactions that could be used for the chemical method include, for example, C02 absorption in aqueous NaOH solution, and the air oxidation of Na2S03 solution with a cupric ion or cobaltous ion catalyst (this is described in the following section). 

A specific rate constant for the rapid complexation of Ag" ion by thiosulphate ion in aqueous solution has been determined, using the recently developed laser optical-acoustic technique for measurement of sound absorption. In aqueous solution the predominant complexed species is the 1 2 ion [Ag(8203)2] ". 

G. Astarita, G. Marrucci, and F. Gioa, The Influence of Carbonation Ratio and Total Amine Concentration on Carbon Dioxide Absorption in Aqueous Monoethanol-amine Solutions, Chem. Eng. Sci., 19 95 (1964). 

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