A Novel CO₂ Phase Change Absorbent: MEA/1-Propanol/H₂O

Abstract

Due to the high energy consumption in CO 2 capture by amine absorbents, CO 2 phase change absorbent, CPCA, has attracted a great attention in research institutes recently. Two phases are formed after CO 2 absorption with CPCA as the absorbent, and only the CO 2 -rich phase goes to the stripper, which could potentially reduce the energy consumption. In this work, the CPCAs composed of MEA/1-propanol/H 2 O were developed based on the principles of aqueous two-phase systems. The effects of temperature, amine concentration, and total CO 2 loading on the phase separation of CPCAs were studied. CO 2 loading and 1-propanol distributions in two phases under different experimental conditions were measured. The results indicated that the total CO 2 loading is the key factor affecting the distribution of components in two phases. Moreover, in comparison to traditional 30 wt % MEA, the initial absorption rates of all CPCAs were higher than that of MEA, and its maximum value was 5 times higher. The cyclic capacity of the CPCA with 30% MEA + 30% 1-propanol + 40% H 2 O was 1.70 mol/kg, which was 52% increased comparing to traditional 30 wt % MEA.

Efficient SO2 Capture by 2-(Diethylamino)ethanol/Hexadecane Phase Separation Absorbent

“…The absorbent could form a liquid–liquid phase change after absorbing CO 2 ; only the CO 2 -rich phase needed to be regenerated, while the CO 2 -lean phase could be reused directly, leading to the energy consumption after capturing CO 2 decreased significantly from 3.7 to 2.4 GJ/t of CO 2 . The widely used CO 2 absorbents are amino acid Ala salt solution, diethylenetriamine/sulfolane/H 2 O, MEA/1-propanol/H 2 O, diethylenetriamine, etc. Through the combination of different absorbents and solvents, CO 2 phase-change solutions with high absorption capacities, low cost, and low viscosity properties can be easily obtained.…”

Phase-Change Reversible Absorption of Hydrogen Sulfide by the Superbase 1,5-Diazabicyclo[4.3.0]non-5-ene in Organic Solvents

“…28,29 Jessop et al 30 reported the ternary system of decane, amidine/ (guanidine) and alcohol for highly efficient reversible capture of CO 2 , which achieved liquid−liquid phase-change due to the polarity variation of the components upon CO 2 absorption. Zhang et al 31 introduced a process for CO 2 capture using the phase-change absorbent MEA/1-propanol/H 2 O. They found that the cyclic capacity and initial absorption rates were higher than those of 30 wt % MEA solution.…”

Promotion of CO2 capture performance using piperazine (PZ) and diethylenetriamine (DETA) bi‐solvent blends

“…1,2 Capturing CO 2 from flue gas using chemical absorption methods is considered to be an effective way to reduce CO 2 emissions. [3][4][5] The most reliable and economical regeneration process because of its high desorption temperature and high desorption enthalpy, which greatly increase the industrial operating cost and limit its industrial application. 10 Another amine used in industry, the tertiary amine N-methyldiethanolamine (MDEA), has low regeneration energy consumption, but high viscosity hinders its heat and mass transfer during the CO 2 absorption process, thus limiting its absorption rate and capacity.…”

“…Global warming, caused by excessive carbon dioxide (CO 2 ) emissions, has become a major environmental issue worldwide . Capturing CO 2 from flue gas using chemical absorption methods is considered to be an effective way to reduce CO 2 emissions . The most reliable and economical technology for CO 2 capture is by absorption using amine‐based solvents because it can handle large volumes of flue gas and capture more than 90% of CO 2 .…”