Carbon dioxide: absorption

When in position, the side-arm k of the carbon dioxide absorption tube is ttached to the T side-arm of the water absorption tube R (Fig. 85) by impreg-... 

A comparison of experimental data for carbon dioxide absorption obtained oy Hatta anci Katori (op. cit.), Grimley [Trans. Inst. Chem. Eng., 23, 228 (1945)], and Vyazov [Zh. Tekh. Fiz. (U.S.S.R.), 10, 1519 (1940)] and for absorption or oxygen and hydrogen by Hodgson (S. M. thesis, Massachusetts Institute of Technology, 1949), Henley (B.S. thesis. University of Delaware, 1949), Miller (B.S. thesis. University of Delaware, 1949), and Richards (B.S. thesis. University of Delaware, 1950) was made by Shei wood and Pigford (Absorption and Extraction, McGraw-Hill, New York, 1952) and is indicated in Fig. 14-78. 

Atmospheric attenuation is the consequence of absorption of radiation by the medium present between emitter and receiver. For thermal radiation, atmospheric absorption is primarily due to water vapor and, to a lesser extent, to carbon dioxide. Absorption also depends on radiation wavelength, and consequently, on hie temperature. Duiser approximates transmissivity as... 

Mass-transfer rates have been determined by measuring the absorption rate of a pure gas or of a component of a gas mixture as a function of the several operating variables involved. The basic requirement of the evaluation method is that the rate step for the physical absorption should be controlling, not the chemical reaction rate. The experimental method that has gained the widest acceptance involves the oxidation of sodium sulfite, although in some of the more recent work, the rate of carbon dioxide absorption in various media has been used to determine mass-transfer rates and interfacial areas. 

Calcium acid sulfite, 76 Carbon dioxide absorption, 301... 

As examples of micro-channel process intensification and the respective equipment, in particular gas/liquid micro reactors and their application to toluene and various other fluorinations and also to carbon dioxide absorption can be mentioned [5]. Generally, reactions may be amenable to process intensification, when performed via high-temperature, high-pressure, and high-concentration routes and also when using aggressive reactants [5]. 

S-Metallo, C-Hydroxy Addition - Carbon Dioxide Absorption... 

Drivers for Performing Carbon Dioxide Absorption in Micro Reactors... 

Carbon dioxide absorption is used for the above-mentioned purpose, hence an analytical tool for judging micro-reactor performance [5]. 

Carbon Dioxide Absorption Investigated in Micro Reactors Cas/liquid reaction 22 [CL 22] Add-base reaction between carbon dioxide and sodium hydroxide... 

In a first set of experiments, the impact of the sodium hydroxide concentration (0.1, 1.0, 2.0 M) and gas-flow direction (co-current, counter-flow) was analysed (50 ml h liquid flow, 65 pm film thickness) [5]. The higher the base concentration, the higher is the conversion of carbon dioxide. For aU concentrations, complete absorption is achieved, but at different carbon dioxide contents in the gas mixture. The higher the carbon dioxide content, the higher is the gas flow velocity and the larger must be the sodium hydroxide concentration for complete absorption. The gas flow direction had no significant effect on carbon dioxide absorption as the gas velocities were still low, so that no pronounced co- or counter-flow operation was realized. 

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. 

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... 

CNS-related disorders, sustained drug release for, 9 82-83 CO2. See also Carbon dioxide absorption of, 23 598-599 as an alternative refrigerant, 27 533 removal by alkanolamines, 23 597-600 CO2 emissions, from FCC unit regenerators, 77 720-721 CO2 flooding, in oil recovery, 78 615-617 CO2 removal unit, 70 646, 648 CO2 stimulation, in oil recovery, 78 617 CO-896, chain length and linearity, 2 12t CO-1270, chain length and linearity,... 

The specimen and reaction mixture are placed in the reaction vessel, which is attached to a reflux condenser. Heat is then applied and the onset of boiling in the reaction mixture is taken as the start of the process. Periodically thereafter, carbon dioxide absorption tubes are removed from the train and replaced by tubes of known weight. Some experiments have been conducted19 in which the reflux mixture was brought to a boil and the test specimen thereafter introduced through a side tube in the reaction flask. This procedure insures that the reaction period... 

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. 

Fig. 4, Carbon dioxide absorption rate for 5 spheres at 25°C o, experimental results for pure water , Lissapol solution (S4).

FIGURE 11-1 Schematic diagram of a closed anesthesia system. [/] Vaporizer for volatile liquid anesthetics. [2] Compressed gas source. [3] Inhalation unidirectional valve. [4] Mask. [5] Unidirectional exhalation valve. [6] Rebreathing bag. [73 Carbon dioxide absorption chamber. 

The CNG acid gas removal process is distinguished from existing AGR processes by three features. The first feature is the use of pure liquid carbon dioxide as absorbent for sulfurous compounds the second feature is the use of triple-point crystallization to separate pure carbon dioxide from sulfurous compounds the third feature is the use of a liquid-solid slurry to absorb carbon dioxide below the triple point temperature of carbon dioxide. Pure liquid carbon dioxide is a uniquely effective absorbent for sulfurous compounds and trace contaminants triple-point crystallization economically produces pure carbon dioxide and concentrated hydrogen sulfide for bulk carbon dioxide absorption the slurry absorbent diminishes absorbent flow and limits the carbon dioxide absorber temperature rise to an acceptable low value. The sequence of gas treatment is shown in Figure 1, an overview of the CNG acid gas removal process. 

Absorption of atmospheric gases Chemical oxidation due to exposure to oxygen in air Change in pH and conductivity due to carbon dioxide absorption Prompt and proper preservation Measurements of field parameters during sampling... 

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