Kinetics of the absorption of carbon dioxide into aqueous ammonia solutions

Abstract

Experiments were performed in a customized double stirred tank reactor to study the kinetics of CO 2 absorption into NH 3 solutions at concentrations ranging from 0.42 to 7.67 kmolÁm 23 and temperatures between 273.15 and 293.15 K. The results show that the reactive absorption was first order with respect to CO 2 but fractional order (1.6-1.8) with respect to ammonia. Experimental data can be satisfactorily interpreted by a termolecular mechanism using k T NH 3 5 7:6089310 8 exp 24018:4 T

Improving membrane performance by incorporating polymer-embedded metal-organic framework microspheres

“…A dual sorption theory was used to describe sorption isotherm of the MMMs: 45,46 (6) where C (cm 3 (STP) cm -3 (MMM)) was solubility. C D andC H represented the amount of gas adsorbed in Henry and Langmuir sites, respectively.…”

“…Various technologies, including absorption and membrane separation, are proposed for CO 2 capture. [3][4][5][6][7][8] Membrane technology has been attracting intensive attention because of its high efficiency, simple operation, environmental friendliness, etc. [7][8][9][10][11] Polymeric membranes with high processibility, low energy requirement, and relatively cheap production cost are widely applied in CO 2 separation.…”

Mixed matrix membranes containing polymer‐embedded metal‐organic framework microspheres

“…Carbon capture, realized by separating CO 2 from other gasses, for example, H 2 , N 2 , and CH 4 , has been considered as a feasible strategy to reduce CO 2 emission. Various technologies, including absorption and membrane separation, are proposed for CO 2 capture 3‐8 . Membrane technology has been attracting intensive attention because of its high efficiency, simple operation, environmental friendliness, and so forth 7‐11 .…”

Enhanced Hydromagnesite Process for CO2 Sequestration by Desilication of Serpentine Ore in NaOH Solution

“…The most advanced postcombustion CO 2 capture technology is the amine-based wet scrubbing process. − However, the high energy penalty in the stripping step results in significant overall costs. − Aqueous ammonia has a larger CO 2 capture capacity than monoethanolamine (MEA), therefore being recognized as a promising substitute for alkanolamine solutions. − The aqueous ammonia-based CO 2 capture process, typically absorbing at 275.15–283.15 K followed by desorption at 373.15–423.15 K, has achieved industrial success in both North America and Europe . The large energy consumption associated with CO 2 stripping remains the main barrier for the widespread deployment of CO 2 capture technology.…”

“…13−15 The aqueous ammonia-based CO 2 capture process, typically absorbing at 275.15−283.15 K followed by desorption at 373.15−423.15 K, has achieved industrial success in both North America and Europe. 16 The large energy consumption associated with CO 2 stripping remains the main barrier for the widespread deployment of CO 2 capture technology. If an ammonia carbonate solution, the product of CO 2 absorption, could be used directly as the feedstock in the CO 2 sequestration step, the energy consumed in the CO 2 stripping step can be saved.…”