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Carbon dioxide absorption by MEA
A preliminary evaluation of a bubbling column reactor
Abstract
Biogas generally contains significant quantities of carbon dioxide in addition to methane. A bubbling column reactor operating at atmospheric pressure is proposed for cheap separation and a Mettler RC1 reaction calorimeter was used to build a simplified empirical model for measuring the molar heat of solubility of CO2 in aqueous solutions of monoethanolamine (MEA). Determinations were performed in 12 mass% MEA solutions regenerated at atmospheric pressure and reflux temperature for 3 h. Flows of CO2 from 174 to 917 mL min−1 were used at a reactor temperature of 283 to 353 K.
Kinetics of carbon dioxide mechanosorption by Ca-containing silicates
CO2 release on heating of mechanically activated samples
Abstract
Kinetics of mechanically induced CO2 extensive sorption by silicate minerals (labradorite, diopside, okermanite, ghelenite and wollastonite) was considered. Mechanical activation of the silicates was carried out in a planetary mill in CO2 at atmospheric pressure. Carbon dioxide was consumed by the silicates in the form of carbonate ions and its content in the samples after 30 min of mechanical treatment reached 3–12 mass% CO2 depending on mineral composition. Equations that reasonably good represent kinetics of CO2 mechanosorption by silicates were proposed. These equations enable to calculate mechanosorption coefficients that characterize the diffusivity of CO2 into disordered silicate matrix under intensive mechanical impact. Thermal analysis of the mechanically activated silicates showed that there was positive correlation between temperature of complete carbonate decomposition and mechanosorption coefficient.
Abstract
The enthalpies of absorption and solubility at T=298.15 K of carbon dioxide in aqueous solutions of bis-(3-dimethylaminopropyl)amine (CAS RN: [6711-48-4]) are reported in this paper. It was observed that the saturation loading of the CO2 is α=2.9 mol CO2/mol TMBPA, which is close to the theoretical value, α0=3 mol CO2/mol TMBPA. The molar heat of absorption of CO2 is independent of the polyamine concentration of the solutions and the amount of CO2 absorbed and was calculated to be Δabs H m=–44 (2) kJ mol–1 CO2.
In order to investigate the relationship between carbon dioxide tensions in the venous blood of young chickens and ascites susceptibility, one hundred dayold chickens from two pure broiler breeder lines differing in susceptibility to ascites syndrome were obtained and reared at low environmental temperature. Weekly, blood samples were taken for the determination of blood gas parameters and plasma thyroid hormone levels. Dead birds were examined for lesions of ascites daily and all survived birds were autopsied at the end of the trials. In cold conditioning, the cumulative incidence of right ventricular hypertrophy (RVH) and ascites was 78% (39/50) in fast-growing (line A) and 50% (25/50) in slow-growing (line B) chickens, confirming that line A chickens had higher susceptibility to ascites than line B chickens. At 12 days of age, the mean pCO 2 tension was significantly (P < 0.01) higher in the venous blood of line A than line B chickens. During the experiment, the majority of line A and line B chickens showing RVH and ascites exhibited pCO 2 tensions equal to, or exceeding 50 mmHg at 12 days of age. Additionally, fast-growing chickens showed significantly lower plasma T3 and T4 concentrations than slow-growing chickens. In conclusion, our data indicate that carbon dioxide pressure in the venous blood of early postnatal broiler chickens could be used as a valuable predictor in the selection of birds susceptible to pulmonary hypertension and ascites. The function of thyroid hormones should also be taken into consideration in further selection procedures for meat-type chickens.
Bajgai, Y. et al., 2011. A laboratory study of soil carbon dioxide emissions in a vertisol and an alfisol due to incorporating corn residues and simulating tillage. Journal of Organic Systems. 6 . (3) 20
energy use, alternative fuels with lower carbon content, use of biofuels or the capture and storage of CO 2 [ 1 , 2 ]. Carbon dioxide can be captured by a variety of techniques, such as amine absorption, membrane separation, cryogenic separation, and
Introduction The dimethyl ether (DME) + carbon dioxide (CO 2 ) mixture can be an attractive option for different applications. In a recent article, the present system was proposed as a solvent [ 1 ], and its solvent properties
of carbon dioxide. Journal of Geophysical Research-Atmospheres 106 , 3057–3069. Weidinger T. Measuring system for the long-term monitoring of biosphere/atmosphere exchange of
work [ 13 ], the immobilization of ionic liquids onto MCM-41 showed excellent activity for carbon dioxide insertion reactions. However, the use of expensive pore-directing agents and large amounts of organic solvents to remove the templates makes these
isobutene yield and poor catalyst stability. The experimental results are still unsatisfactory for practical applications. In our previous work [ 9 ], we found that the coupling dehydrogenation of isobutane in carbon dioxide over NiO/AC has better results
