Chemisorptive Removal of Carbon Dioxide from Process Streams Using a Reactive Bubble Column with Simultaneous Production of Usable Materials

Abstract

In the context of attempts to improve the protection of the environment, a novel process where the carbon dioxide reacts rapidly with almost 100 % conversion under mild conditions, is proposed. The chemisorptive process takes place in a slurry bubble column which operates with countercurrent flow, utilizing special solutions of primary long chain amines in a nonaqueous media. The product obtained is insoluble and separated by filtration. Because of its molecular structure, this product possesses tenside properties and can be used as an industrial additive. Typically the liquid phase consists of a mixture of hexadecylamine (C 16 H 33 NH 2 ) or dodecylamine (C 12 H 25 NH 2 ) in various concentrations with methanol or other alcohols as the solvent. Numerous parameters have been studied including different column heights, gas inlet compositions, gas flow rates and solvent type. Efficiencies of up to 99 % are achievable for CO 2 absorption with methanol as the solvent. The second solvent examined, isopropanol, shows lower CO 2 conversion rates. This can be attributed to its physical properties, mainly higher viscosity and hence, smaller mass transfer coefficient. In order to simulate real gas conditions, the influence of other sour gases, e.g., SO 2 was also investigated experimentally. Because of coabsorption of the two gases, the CO 2 efficiency was lower in this instance. In both solvents, the absorption efficiency with respect to SO 2 is more than 99 % due to its high solubility and reactivity. A complex mathematical model has been developed and applied to describe the mass and enthalpy transport in the reactive bubble column.

CO2 Capture Using Monoethanolamine in a Bubble‐Column Scrubber

“…Operating conditions and measured data obtained in this work. [24,[34][35][36][37]. Other evaluated output data, such as removal efficiency, absorption rate, overall mass transfer coefficient, and scrubbing factor, are also listed in Tab.…”

CO2 Capture and Crystallization of Ammonia Bicarbonate in a Lab-Scale Scrubber

“…Regarding the bubble column, the absorption factor is 5 to 10 times that of the packed column of high-efficiency structured packing material, which indicates that under the same conditions, in order to obtain the same absorption factor, the volume of the packed column of high-efficiency structured packing material should be 5 to 10 times that of the bubble column; and while the volume of a conventional packed column, needs to be 130 times that of the bubble column to have the same absorption factor as the bubble column [21]. The above results show that the bubble column shows superior performance and many scholars use the bubble column as the absorber and object of study to this end [5,[22][23][24]. To summarize, using aqueous ammonia as the absorbent requires high load and low energy for regeneration.…”

“…The above results show that the bubble column shows superior performance and many scholars use the bubble column as the absorber and object of study to this end [5,[22][23][24]. To summarize, using aqueous ammonia as the absorbent requires high load and low energy for regeneration.…”

A Study on CO2 Absorption in Bubble Column Using DEEA/EEA Mixed Solvent

“…In recent studies, CO2 absorption technologies have become more diversified, among which chemical absorption effect is the best (Bai and Yeh, 1997;Yeh et al, 1999;Chen et al, 2005;Yang et al, 2005;Lin et al, 2003;Petrov, et al, 2006). Internationally, thousands of factors use amines as absorbent to absorb CO2 (Versteeg et al, 1996;Xiao et al, 2000).…”