Chunfei Wu

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CO2 absorption - solvent - Amine-based - Methodologies - absorption, solvent properties testing - CO2 absorption procedure

Experimental setup used for the high-pressure CO2 capture

https://doi.org/10.3390/en14206822

“The experimental setup used for the high-pressure CO2 capture experiments is schematically depicted in Figure 1; it consists of a non-stirred pressure vessel (Parr Instrument Co., Moline, USA, model 4763) made of alloy C-276 with an internal volume of 98.7 cm3. The vessel has a movable head equipped with: (1) a differential pressure gauge, (2) a 0–20,685 KPa pressure transducer with an accuracy of ±10 KPa, (3) a type J thermocouple accurate to within ±0.1 K, and (4) a valve series allowing gas release, liquid sampling, and gas injection into the liquid phase. A pressure regulator connected to a pure CO2 store cylinder is used for the gas supply. A heating unit and a temperature controller (Parr Instrument Co., model 4838) are used to control the vessel temperature. The setup is connected to a data acquisition interface, which records temperature and pressure measurements on a computer using SpecView 32 SCADA software (SpecView Corp., Gig Harbor, WA, USA). The vessel pressurization was carried out in a pulse by bubbling the pure CO2 directly into the liquid phase to guarantee an intimate contact between the gas and the liquid from the experiments’ first instants. This action could represent an advantage in the initial gas mass transfer process through the gas–liquid interface [34,35], considering that it is a non-stirred system.”

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“The experimental setup is designed to work in extreme conditions, i.e., maximum allowable working pressure (MAWP) 20,685 KPa, and maximum temperature 500 K. For safety reasons, the maximum allowable operating pressure (MAOP) was reduced to 6900 KPa.”

“CO2 Solubility Testing Procedure

Testing of the solubility of CO2 in water was performed to validate the high-pressure experimental setup by measuring the high-pressure vessel’s equilibrium pressure for a known amount of gas and water in a closed system (batch mode). Initially, the high-pressure vessel was charged with 30 ± 0.2 cm3 of ultrapure water using a glass pipette. The vessel was coupled to the experimental setup, and the temperature was set to 303 K. Then, the vessel was pressurized with pure CO2 up to the desired initial pressure value (700, 2100, 3500 KPa), and the system was closed. Pressure and temperature data were recorded until pressure stabilization for 24 h.
CO2 Capture Testing Procedure Using EDA
The ethylenediamine aqueous solutions were prepared at different concentrations (0, 5, 10, and 20 wt.% in amine) by adding the appropriate amine mass to ultrapure water while stirring it for 1 min. The experimental procedure defined for CO2 capture testing using EDA was similar to that developed for the CO2 solubility tests. The high-pressure vessel was loaded with 30 ± 0.2 cm3 of the aqueous EDA solution to be tested. The vessel was coupled to the experimental setup, and the temperature was set to 303 K. The vessel was then pressurized with pure CO2 up to 3500 KPa, and the system was closed. The initial pressure (3500 KPa) was established to maximize the driving force of the CO2 capture process [15]. Pressure and temperature data were recorded until pressure stabilization for 12 h.”

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