scholarly journals Selective Electrochemical Regeneration of Aqueous Amine Solutions to Capture CO2 and to Convert H2S into Hydrogen and Solid Sulfur

2021 ◽  
Vol 11 (21) ◽  
pp. 9851
Author(s):  
Frédérick de Meyer ◽  
Charles Bignaud ◽  
Bénédicte Poulain
Keyword(s):  
Renewable Energy ◽  
Proof Of Concept ◽  
Desorption Energy ◽  
Thermal Regeneration ◽  
Electrochemical Regeneration ◽  
Capture Process ◽  
Amine Solution ◽  
Co2 Desorption ◽  
Separation Of Co2 ◽  
Amine Solutions

Removing CO2 from natural gas or biogas in the presence of H2S is technically challenging and expensive as it often requires separation of both acid gases from the gas, typically using an aqueous amine solution, followed by separation of CO2 from H2S and conversion of H2S into solid S. In this work, the proof of concept of electrochemical, instead of thermal, regeneration of an aqueous amine solution is developed. This invention might be a very promising technology and has several advantages. It has H2S versus CO2 selectivity of 100%, can directly convert H2S into S and H2, and is economically competitive with CO2 desorption energy around 100 kJmol−1 and H2S conversion around 200 kJmol−1. If renewable energy is used for electrochemical regeneration, CO2 emissions due to the CO2 capture process can be significantly reduced.

CO2 Capture Using Calcium Oxide Applicable to In-Situ Separation of CO2 From H2 Production Processes

2013 ◽  
Author(s):  
Saeed Danaei Kenarsari ◽  
Yuan Zheng
Keyword(s):  
Calcium Oxide ◽  
Co2 Capture ◽  
Fixed Bed ◽  
H2 Production ◽  
Fixed Bed Reactor ◽  
Capture Process ◽  
Conversion Rates ◽  
In Situ Separation ◽  
Separation Of Co2

A lab-scale CO2 capture system is designed, fabricated, and tested for performing CO2 capture via carbonation of very fine calcium oxide (CaO) with particle size in micrometers. This system includes a fixed-bed reactor made of stainless steel (12.7 mm in diameter and 76.2 mm long) packed with calcium oxide particles dispersed in sand particles; heated and maintained at a certain temperature (500–550°C) during each experiment. The pressure along the reactor can be kept constant using a back pressure regulator. The conditions of the tests are relevant to separation of CO2 from combustion/gasification flue gases and in-situ CO2 capture process. The inlet flow, 1% CO2 and 99% N2, goes through the reactor at the flow rate of 150 mL/min (at standard conditions). The CO2 percentage of the outlet gas is monitored and recorded by a portable CO2 analyzer. Using the outlet composition, the conversion of calcium oxide is figured and employed to develop the kinetics model. The results indicate that the rates of carbonation reactions considerably increase with raising the temperature from 500°C to 550°C. The conversion rates of CaO-carbonation are well fitted to a shrinking core model which combines chemical reaction controlled and diffusion controlled models.

Reducing energy consumption of CO2 desorption in CO2-loaded aqueous amine solution using Al2O3/HZSM-5 bifunctional catalysts

2018 ◽  
Vol 229 ◽  
pp. 562-576 ◽  
Author(s):  
Xiaowen Zhang ◽  
Helei Liu ◽  
Zhiwu Liang ◽  
Raphael Idem ◽  
Paitoon Tontiwachwuthikul ◽  
...  
Keyword(s):  
Energy Consumption ◽  
Bifunctional Catalysts ◽  
Amine Solution ◽  
Co2 Desorption ◽  
Reducing Energy

Amine Structure-Foam Behavior Relationship and Its Predictive Foam Model Used for Amine Selection for Design of Amine-based Carbon Dioxide (CO2) Capture Process

2020 ◽  
Vol 1 (1) ◽  
pp. 43-57
Author(s):  
Pailin Muchan ◽  
Jessica Narku-Tetteh ◽  
Teeradet Supap ◽  
Raphael Idem
Keyword(s):  
Surface Tension ◽  
Model Development ◽  
Foam Formation ◽  
Plant Design ◽  
Structural Variations ◽  
Capture Process ◽  
Foam Volume ◽  
Cyclic Amines ◽  
Amine Solution ◽  
Foam Model

Background: The use of an amine solution to capture CO2 from flue gases is one of the methods applied commercially to clean up the exhaust gas stream of a power plant. One of the issues in this process is foaming which should be known in order to select a suitable amine for design. Objectives: In this work, all possible types of amines used for CO2 capture, namely, alkanolamines, sterically hindered alkanolamines, multi-alkylamines and cyclic amines, were investigated to elucidate their chemical structure–foaming relationships. Methods: Foam volume produced by each type of 2M amine solution with its equilibrium CO2 loading was measured at 40°C using 94 mL/min of N2 flow. Results: Amines with a higher number or a longer chain of the alkyl group exhibited higher foam volume because of alkyl group’s ability to decrease the surface tension while increasing the viscosity of the solution. An increase in the number of hydroxyl or amino groups in the amine led to the reduction of foam formation due to the increase in surface tension and a decrease in viscosity of the solution. The predictive foam models for non-cyclic and cyclic-amines developed based on the structural variations, surface tension and viscosity of 29 amines predicted the foam volume very well with average absolute deviations (AAD) of 12.7 and 0.001%, respectively. The model accurately predicted the foam volume of BDEA, which was not used in model development with 13.3 %AD. Conclusion: This foam model is, therefore, indispensable in selecting a suitable amine for an amine-based CO2 capture plant design and operation.

Discussion on Activated Carbon Regeneration Method

2014 ◽  
Vol 641-642 ◽  
pp. 1127-1130 ◽  
Author(s):  
Guo Ping Wang
Keyword(s):  
Carbon Dioxide ◽  
Activated Carbon ◽  
Wet Oxidation ◽  
Supercritical Carbon Dioxide Extraction ◽  
Thermal Regeneration ◽  
Electrochemical Regeneration ◽  
Oxidation Method ◽  
Carbon Dioxide Extraction ◽  
Chemical Regeneration ◽  
Carbon Regeneration

As an effective adsorbent, activated carbon is widely used in the treatment of wastewater. Describes some of the regeneration of activated carbon for reference: thermal regeneration method, chemical regeneration, biological regeneration method, electrochemical regeneration, regeneration ozone oxidation, wet oxidation regeneration shown, supercritical carbon dioxide extraction regeneration, regeneration of catalytic oxidation method, microwave and ultrasonic regeneration and so on.

Utilization of tertiary amine solutions and ultrasound irradiation for CO2 desorption at low temperature in a CCS process

2021 ◽  
Vol 60 (SD) ◽  
pp. SDDD01
Author(s):  
Hirokazu Okawa ◽  
Hiroyasu Ito ◽  
Tatsuo Fujiwara ◽  
Yuya Kitamura ◽  
Takahiro Kato ◽  
...  
Keyword(s):  
Low Temperature ◽  
Tertiary Amine ◽  
Ultrasound Irradiation ◽  
Co2 Desorption ◽  
Amine Solutions

Research on Environment Materials with Progress on Regeneration of Active Carbon

2014 ◽  
Vol 540 ◽  
pp. 235-238
Author(s):  
Xin Zhong Liu ◽  
Yong Jie Huang ◽  
Ze Ran Cheng ◽  
Wei Liao
Keyword(s):  
Activated Carbon ◽  
Microwave Radiation ◽  
Supercritical Fluid ◽  
Active Carbon ◽  
Air Oxidation ◽  
Wet Air Oxidation ◽  
Thermal Regeneration ◽  
Electrochemical Regeneration ◽  
Advantages And Disadvantages ◽  
Chemical Regeneration

Now activated carbon has been used greatly in all walks of life, thus the regeneration of spent activated carbon is of great significance. The advantages and disadvantages of the regeneration methods of the spent activated carbon are introduced and discussed in this paper, mainly including thermal regeneration, chemical regeneration, electrochemical regeneration, microwave radiation regeneration, wet air oxidation and supercritical fluid regeneration etc. Then a new recycling method of the spent activated carbon is proposed.

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