Reactions with absorption

Sada, E., Kumazawa, H. and Butt, M.A., 1977. Single gas absorption with reaction in a slurry containing fine particles. Chemical Engineering Science, 32, 1165-1170. 

In case (1), the reaction is used for the removal of an undesirable substance from a gas stream. In this sense, the process is commonly referred to as gas absorption with reaction. Examples are removal of H2S or CO, from a gas stream by contact with an ethanolamine (e g., monoethanolamine (MEA) or diethanolamine (DEA)) in aqueous... 

Enhanced surfactant flooding, 23 532 Enhancement factor, gas absorption with reaction, 1 47-48 Enhancement programs, aquatic organisms, 3 183, 198 Enhancement reagents, 12 102 Enhancer, 10 688 Enichem oxo-alcohols, 17 725 Enkaid, molecular formula and structure, 5 92t... 

CHART SPEED CHANGE (ii) ABSORPTION WITH REACTION... 

Burning of coal Roasting of ores Attack of solids by acids Gas-liquid absorption with reaction Reduction of iron ore to iron and steel... 

An alternate correlation has been proposed by Puranik and Vogelpohl (P16) for the values of effective interfacial areaov (during vaporization), Uac (absorption with reaction), Uap (without reaction), and corresponding values of the wetted surface areauw The effective interfacial area is then divided into static and dynamic areas (Uj, + a yn) for vaporization and absorption with chemical reaction. For absorption without reaction, the effective interfacial area is only the dynamic area. Thus... 

Multiphase Reactors Reactions between gas-liquid, liquid-liquid, and gas-liquid-solid phases are often tested in CSTRs. Other laboratory types are suggested by the commercial units depicted in appropriate sketches in Sec. 19 and in Fig. 7-17 [Charpentier, Mass Transfer Rates in Gas-Liquid Absorbers and Reactors, in Drew et al. (eds.), Advances in Chemical Engineering, vol. 11, Academic Press, 1981]. Liquids can be reacted with gases of low solubilities in stirred vessels, with the liquid charged first and the gas fed continuously at the rate of reaction or dissolution. Some of these reactors are designed to have known interfacial areas. Most equipment for gas absorption without reaction is adaptable to absorption with reaction. The many types of equipment for liquid-liquid extraction also are adaptable to reactions of immiscible liquid phases. 

In the initial stages of the reaction, when the particle size is large, the rate of solid dissolution is high as compared to the rate of CO2 absorption with reaction. The bulk concentration of OH is equal to the saturation concentration [5], i.e., [il]o =... 

This converts to = 2.18 lb moles/(hr-fF-atm), very close to the value of 2.20 measured by Eckert et al. The absorption with reaction is about 32 times faster than for physical absorption alone. 

Absorption with Reaction in a Slurry Containing Fine... 

There are two distinct categories of reactive separations. In one category, the reaction aids separation and in the other separation aids the reaction. In the former, decreasing or eliminating the mass-transfer resistance on the liquid side by allowing the solute to react with a non-volatile non-diffusing component as in the absorption of CO2 into an amine solution enhances the mass-transfer rate. Absorption with reaction has been practised for the removal of CO2 and H2S over the past several decades, and an extensive literature is available. Similarly, in distillation, reactive entrainers are used to separate close boiling or azeotropic mixtures [19]). 

Sharma,M.M. "Absorption with reaction". (Plenary Lecture, CHISA, Prague, 1975. 

Ramachandran.P. and M.M.Sharma. "Absorption with reaction in a slurry containing sparingly soluble fine particles." Chem.Engng. Sci. 24 (1969) 1631. 

The effect of chemical reaction is to increase the absorption rate, giving an increase in the heat released due to solution in comparison with the physical absorption case. Also, additional heat will now be released if the reaction is exothermic, and since usuall AHj >AH, absorption with reaction can be expected to offer substantiafly greater heat effects. 

A1per,E, and U.-D.Deckwer. "Absorption with reaction Design methods and effect of viscosity for packed columns". (IChemE Jubilee Symposium, EFCE Pub.Series No 21. London, 1982) p.Dl29. 

Beall, G.W. (1985b). Method of removing organie eontaminants from aqueous compositions absorption with reaction product of clay and quaternary ammonium salt. U.S. Patent 4,549,590. 

The absorption of SO3 and the removal of CO2 by a chemical absorbent are also examples of gas-liquid reactions. Since the principal aim is to absorb the acid gas, it is generally stated that these are examples of absorption with reaction. However, it should be remembered that the reaction step, which comes after the physical dissolving of the gas at the surface, can control the overall rate of the process. Roughly speaking, the liquid will, in these cases, be saturated with the free gas and more is not absorbed until some is... 

Heterogeneous Reaction of solids and liquids. Burning of coal. Roasting of ores. Gas-liquid absorption with reaction. Production of bio-mass Ammonia synthesis. Cracking of crude oil. Oxidation of sulphur dioxide. Gas-liquid absorption with reaction (often promoters added)... 

Absorption with reaction Sulfuric acid production SOj in H2SO4 Packed column... 

---