A new kinetic model for CO2 capture on sodium zirconate (Na2ZrO3): An analysis under different flow rates

The demand for carbon capture is increasing over time due to rising CO2 levels in the atmosphere. Even though fossil emission could be decreased or even eliminated, there is a need to start removing CO2 from the atmosphere. The removed CO2 could be either stored permanently to a reservoir (CCS, Carbon Capture and Storage) or utilized as a raw material in a long-lasting product (CCU, Carbon Capture and Utilization). The capture of CO2 could be done by direct air capture, or capturing CO2 from biogenic sources. Amine absorption is the state-of-the-art method to capture CO2, but it has some drawbacks: toxicity, high heat demand, and sorbent sensitivity towards impurities such as sulfur compounds and degradation in cyclic operation. Another potential solvent for CO2 could be water, which is easily available and safe to use in many applications. The problem with water is the poorer solubility of CO2, compared with amines, which leads to larger required flow rates. This study analyzed the technical feasibility of water absorption in a counterflow bubble column reactor. A dynamic, one-dimensional multiphase model was developed. The gas phase was modeled with plug flow assumption, and the liquid phase was treated as axially dispersed plug flow. CO2 capture efficiency, produced CO2 mass flow rate, and the product gas CO2 content were estimated as a function of inlet gas and liquid flow rate. In addition, the energy consumption per produced CO2-tonne was calculated. The CO2 capture efficiency was improved by increasing the liquid flow rate, while the CO2 content in product gas was decreased. For some of the studied liquid flow rates, an optimum gas flow rate was found to minimize the specific energy consumption. Further research is required to study the integration and dynamical operation of the system in a realistic operation environment.

Download Full-text

Study on CO2 Capture Characteristics and Kinetics of Modified Potassium-Based Adsorbents

Materials ◽

10.3390/ma13040877 ◽

2020 ◽

Vol 13 (4) ◽

pp. 877 ◽

Cited By ~ 2

Author(s):

Baihe Guo ◽

Yanlin Wang ◽

Xin Shen ◽

Xiaolei Qiao ◽

Li Jia ◽

...

Keyword(s):

Water Vapor ◽

Kinetic Model ◽

Co2 Capture ◽

Silica Aerogel ◽

Sol Gel ◽

Co2 Concentration ◽

Vapor Concentration ◽

Water Vapor Concentration ◽

Gel Method ◽

Sol Gel Method

In this paper, a silica aerogel support was prepared by two-step sol–gel method, and the active component K2CO3 was supported on the support by wet loading to obtain a modified potassium-based CO2 adsorbent. As the influences of reaction conditions on the CO2 capture characteristics of modified potassium-based adsorbents, the reaction temperature (50 °C, 60 °C, 70 °C, 80 °C), water vapor concentration (10%, 15%, 20%), CO2 concentration (5%, 10%, 12.5%, 15%), and total gas flow rate (400 mL/min, 500 mL/min, 600 mL/min) were studied in a self-designed fixed-bed reactor. At the same time, the low-temperature nitrogen adsorption experiment, scanning electron microscope, and X-ray diffractometer were used to study the microscopic characteristics of modified potassium-based adsorbents before and after the reaction. The results show that the silica aerogel prepared by the two-step sol–gel method has an excellent microstructure, and its specific surface area and specific pore volume are as high as 838.9 m2/g and 0.85 cm3/g, respectively. The microstructure of K2CO3 loaded on the support is improved, which promotes the CO2 adsorption performance of potassium-based adsorbents. The adsorption of CO2 by potassium-based adsorbents can be better described by the Avrami fractional kinetic model and the modified Avrami fractional kinetic model, and it is a complex multi-path adsorption process, which is related to the adsorption site and activity. The optimal adsorption temperature, water vapor concentration, CO2 concentration, and total gas volume were 60 °C, 15%, 12.5%, and 500 mL/min, respectively.

Download Full-text

A Kinetic Model of Nuclear Waste Glass Dissolution in Flowing Water Environments

MRS Proceedings ◽

10.1557/proc-44-229 ◽

1984 ◽

Vol 44 ◽

Cited By ~ 2

Author(s):

Aaron Barkatt ◽

Barbara C. Gibson ◽

Marek Brandys

Keyword(s):

Kinetic Model ◽

Nuclear Waste ◽

Flow Rate ◽

Flowing Water ◽

Flow Rates ◽

Glass Dissolution ◽

Nuclear Waste Glass ◽

Simple Kinetic Model ◽

Leachate Composition ◽

Flow Experiments

AbstractA simple kinetic model for the description of the interaction of nuclear waste borosilicate glass with water has been developed. In the case of SRL TDS-131 glass leached in water at 70°C over a broad range of flow rates this model was found useful both in describing the evolution of leachate composition as a function of exposure time at a particular flow rate and in describing the dependence of the steady-state concentrations of the leached elements in solution on flow rate in a series of flow experiments.

Download Full-text

Simulation model evaluation of desorber column in CO2 capture process by MEA scrubbing: A rigorous rate-based model for kinetic model and mass transfer correlations analysis

Fuel Processing Technology ◽

10.1016/j.fuproc.2020.106390 ◽

2020 ◽

Vol 203 ◽

pp. 106390 ◽

Cited By ~ 1

Author(s):

Mahsa Amirkhosrow ◽

Ebrahim Nemati Lay

Keyword(s):

Mass Transfer ◽

Kinetic Model ◽

Simulation Model ◽

Co2 Capture ◽

Model Evaluation ◽

Capture Process

Download Full-text

Polymer Blends for Improved CO2 Capture Membranes

Polymers ◽

10.3390/polym11101662 ◽

2019 ◽

Vol 11 (10) ◽

pp. 1662

Author(s):

Alireza Zare ◽

Lorenza Perna ◽

Adrianna Nogalska ◽

Veronica Ambrogi ◽

Pierfrancesco Cerruti ◽

...

Keyword(s):

Carbon Dioxide ◽

Water Uptake ◽

Co2 Capture ◽

Potassium Hydroxide Solution ◽

Cross Flow ◽

Composite Membranes ◽

Contact Angles ◽

Carbon Dioxide Absorption ◽

Water Contact ◽

Flow Rates

We investigated the possibility of improving the performance of polysulfone (PSf) membranes to be used in carbon dioxide capture devices by blending PSf with a commercial polyethylene imine, Lupasol G20, previously modified with benzoyl chloride (mG20). Additive amount ranged between 2 and 20 wt %. Membranes based on these blends were prepared by phase inversion precipitation and exhibited different morphologies with respect to neat PSf. Surface roughness, water contact angles, and water uptake increased with mG20 content. Mass transfer coefficient was also increased for both N2 and CO2; however, this effect was more evident for carbon dioxide. Carbon dioxide absorption performance of composite membranes was evaluated for potassium hydroxide solution in a flat sheet membrane contactor (FSMC) in cross flow module at different liquid flow rates. We found that, at the lowest flow rate, membranes exhibit a very similar behaviour to neat PSf; nevertheless, significant differences can be found at higher flow rates. In particular, the membranes with 2 and 5 wt % additive behave more efficiently than neat PSf. In contrast, 10 and 20 wt % additive content has an adverse effect on CO2 capture when compared with neat PSf. In the former case, a combination of additive chemical affinity to CO2 and membrane porosity can be claimed; in the latter case, the remarkably higher wettability and water uptake could determine membrane clogging and consequent loss of efficiency in the capture device.

Download Full-text

ULTRASONIC ATTENUATION IN METALS DEFORMING AT HIGH RATES OF STRAIN : DATA ANALYSIS BY USING A KINETIC MODEL OF DISLOCATION LOOPS

Le Journal de Physique Colloques ◽

10.1051/jphyscol:1987827 ◽

1987 ◽

Vol 48 (C8) ◽

pp. C8-197-C8-202

Author(s):

J. SHIOIRI ◽

K. SAKINO

Keyword(s):

Data Analysis ◽

Kinetic Model ◽

Ultrasonic Attenuation ◽

Dislocation Loops ◽

Strain Data

Download Full-text

Automation of Process Control in Chemical Plant

ACMIT Proceedings ◽

10.33555/acmit.v2i1.3 ◽

2015 ◽

Vol 2 (1) ◽

pp. 6-12

Author(s):

Agus Sugiarta ◽

Houtman P. Siregar ◽

Dedy Loebis

Keyword(s):

Process Control ◽

Pid Control ◽

Control Algorithm ◽

Chemical Engineering ◽

Chemical Plant ◽

Raw Material ◽

Flow Rates ◽

Material Supply ◽

Wide Range ◽

Inherent Problem

Automation of process control in chemical plant is an inspiring application field of mechatronicengineering. In order to understand the complexity of the automation and its application requireknowledges of chemical engineering, mechatronic and other numerous interconnected studies.The background of this paper is an inherent problem of overheating due to lack of level controlsystem. The objective of this research is to control the dynamic process of desired level more tightlywhich is able to stabilize raw material supply into the chemical plant system.The chemical plant is operated within a wide range of feed compositions and flow rates whichmake the process control become difficult. This research uses modelling for efficiency reason andanalyzes the model by PID control algorithm along with its simulations by using Matlab.

Download Full-text