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

Abstract

The carbon dioxide post‐combustion capture process using amine solutions is considered the most appropriate method for CO2 capture from flue gas in power plants. This paper focuses on the CO2 capture performance of six common organic amines. Two amines, piperazine (PZ) and diethylenetriamine (DETA), which showed better performance, were then filtered out to form amine blends to improve performance further. The absorption heat from the CO2 absorbing process was measured directly using an advanced C80 micro calorimeter for more accurate calculation of regenerative energy consumption. Experimental results confirmed the optimal amine blend to be 10% PZ plus 20% DETA, with a 42% increase in absorption capacity and a 9% increase in initial absorption rate compared to traditional 30% monoethanolamine (MEA). The regeneration energy consumption of this chosen PZ‐DETA blend was calculated to be 3.979 GJ/ton CO2, a decrease of 9% compared with MEA. Moreover, it led to an improvement of about 55% in stable cyclic absorption capacity in comparison with 30% MEA. It was confirmed that this PZ‐DETA blend can bring practical economic benefits to industrial applications when replacing the current 30% MEA solution. © 2019 Society of Chemical Industry and John Wiley & Sons, Ltd.

Investigating the Performance of Ethanolamine and Benzylamine Blends as Promising Sorbents for Postcombustion CO2 Capture through 13C NMR Speciation and Heat of CO2 Absorption Analysis

“…The CO 2 absorption heat for each solution was measured directly with a high-precision microcalorimeter, a powerful tool that is being increasingly used and approved for this type of determination. , The experimental setup and procedure followed were the same as those already described by Zheng and Liu in previous papers. , Briefly, before the absorption process starts, an appropriate amount of the tested blend solution was placed in the sample cell and the reaction temperature was set to the desired value of 313 K. When both the sample temperature and the heat flow signal were stabilized, a gaseous mixture with a known amount of CO 2 (in these experiments, 15% v/v) was continuously injected into the reactor. The chemical absorption of CO 2 by the sorbent involves variations in the heat flow, continuously recorded by the microcalorimeter.…”

Novel biphasic amino-functionalized ionic liquid solvent for CO2 capture: kinetics and regeneration heat duty

“…The energy penalty during the CO 2 regeneration process (Q regen , GJ ton −1 CO 2 ) usually consists of the heat of absorption (Q des ), the sensible heat (Q sen ), and the latent heat of vaporization (Q laten ), which can be expressed below (Liu et al 2019b):…”

A Review on Carbon Dioxide Minimization in Biogas Upgradation Technology by Chemical Absorption Processes

“…A blended solution of 20% DETA (diethelenetriamine) and 10% PZ showed an increase of 42% compared to 30% MEA. This blended solution also decreased the regeneration energy, making the solution cost-friendly …”

“…This blended solution also decreased the regeneration energy, making the solution costfriendly. 51 AMP (amino methyl propanol) and MDEA (methyldiethanolamine) have low energy consumption for solvent regeneration, but they have a low absorption rate. 52,53 Compared to 30% of MEA with (23 wt % AMP + 7 wt % PZ), it was reported that overall mass transfer coefficient K y a v increases from 10 to 28 kmol/m 3 h when the operation pressure is 0.1−4.0 MPa for the blended AMP + PZ, whereas for 30% MEA, at same operating pressure, the K y a v increases from 8 to 23 kmol/m 3 h. 54 This proves that, due to the higher mass transfer, the blended AMP + PZ is more effective at improving the CO 2 absorption reaction rate than is MEA.…”