The document discusses solvent criteria for carbon capture, including a review of monoethanolamine (MDEA). It examines MDEA's properties like capacity, absorption rate, heat of absorption, volatility, and degradation from oxidative and thermal sources. The document also reviews MDEA blends with other amines for improved absorption rate and reduced degradation. It describes challenges in analyzing ternary blends and a molecular dynamics model used to simulate their complex interactions and synergies to lower energy needs for carbon dioxide desorption.
7. THERMAL DEGRADATION
Thermal degradation is usually found in the
desorper with the desorption temperature of
120 °C. The present of CO2 could catalyze
the process of thermal degradation of amine-
based solvents
8. OXIDATIVE DEGRADATION
Oxidative degradation occurs in the CO2
absorption process, which is caused by the
oxygen (concentration varying from 3 to 5%)
in the flue gas streams. The Oxidative
degradation mainly happen in the absorber at
the temperature range of 40–70°C
9. MDEA REVIEW
VOLATILITY
The amino group provides the
basicity to absorb acid gases by an
acid-base reaction, while the OH
functional group brings about
decrease in vapour pressure of the
alkanolamine leading to its higher
solubility in water.
12. MDEA TERNARY BLENDS
• For ternary experimental method
is difficult to know the complex
physical and chemical properties
• molecular dynamics theory, a
synergy molecular dynamics
(SMD) model was developed to
describe multiple amine mixtures.
• the smaller MSN corresponding
to the less energy consumption
for desorption.
