CO2 Separation Process Research Articles

Biogas Upgrading via Cyclic CO2 Adsorption: Application of Highly Regenerable PEI@nano-Al2O3 Adsorbents with Anti-Urea Properties.

Solid amine adsorbents are among the most promising CO2 adsorption technologies for biogas upgrading due to their high selectivity toward CO2, low energy consumption, and easy regeneration. However, in most cases, these adsorbents undergo severe chemical inactivation due to urea formation when regenerated under a realistic CO2 atmosphere. Herein, we demonstrated a facile and efficient synthesis route, involving the synthesis of nano-Al2O3 support derived from coal fly ash with a CO2 flow as the precipitant and the preparation of polyethylenimine (PEI)-impregnated Al2O3-supported adsorbent. The optimal 55%PEI@2%Al2O3 adsorbent showed a high CO2 uptake of 139 mg·g-1 owing to the superior pore structure of synthesized nano-Al2O3 support and exhibited stable cyclic stability with a mere 0.29% decay per cycle even under the realistic regenerated CO2 atmosphere. The stabilizing mechanism of PEI@nano-Al2O3 adsorbent was systematically demonstrated, namely, the cross-linking reaction between the amidogen of a PEI molecule and nano-Al2O3 support, owing to the abundant Lewis acid sites of nano-Al2O3. This cross-linking process promoted the conversion of primary amines into secondary amines in the PEI molecule and thus significantly enhanced the cyclic stability of PEI@nano-Al2O3 adsorbents by markedly inhibiting the formation of urea compounds. Therefore, this facile and efficient strategy for PEI@nano-Al2O3 adsorbents with anti-urea properties, which can avoid active amine content dilution from PEI chemical modification, is promising for practical biogas upgrading and various CO2 separation processes.

Separation of CO2 from Dilute Gas Streams Using a Membrane Electrochemical Cell

We report on an electrochemically driven CO2 separation process employing commercial anion exchange membranes to directly remove CO2 from a dilute gas mixture and transport it across a cell. This m...

Development of novel blend poly (Ethylene Glycol) / Poly(Ethersulfone) polymeric membrane using N-Methyl-2-Pyrollidone and dimethylformamide solvents for facilitating CO2/N2 gas separation

Carbon dioxide (CO2) emissions have been the main cause for anthropogenic climate change. To meet the growing demand for CO2 removal, membrane separation technology using blend membranes is a promising and attractive alternative. Recently, blend membranes consisting of glassy and rubbery polymers has risen in popularity for the gas separation industry due to its ability to effectively minimise trade-off between selectivity and permeability. In this study, glassy poly(ethersulfone) (PES) is blended with rubbery poly(ethylene glycol) (PEG) using a mixture of n-methyl-2-pyrrolidone (NMP) and dimethylformamide (DMF) solvents. Compatibility of PES, PEG, NMP, and DMF within the casting solution was studied using the Hansen solubility parameter (HSP) ternary diagram. Moreover, compatibility of different weight ratio of NMP/DMF solvents (45/15, 40/20, 30/30, 20/40, and 15/45) with respect to the 20/20 PEG/PES polymer blend was investigated based on its relative affinity values. Additionally, single-gas permeation test was used to evaluate the performance of the synthesized PEG/PES blend membranes towards CO2/nitrogen (N2) separation. Scanning electron microscopy, contact angle, and attenuated total reflectance fourier transform infrared spectroscopy (ATR-FTIR) analysis were conducted to analyse the membrane morphology, wettability, and functional groups, respectively. Based on the HSP ternary diagram, PES, PEG, NMP, and DMF were predicted to be miscible in the casting solution. Blends are also deemed more compatible with higher DMF fraction due to the decreasing relative affinity values with increasing DMF fraction. According to the results, NMP/DMF solvent concentration was optimized at 20/40 NMP/DMF having obtained the highest CO2/N2 selectivity of 1.36 ± 0.01 and CO2 permeance of 6277.45 ± 11.0 GPU. On that regard, the enhanced CO2/N2 gas separation performance of the PEG/PES blend membrane can potentially have an important contribution to CO2 separation processes in the industry in order to decrease emissions and minimize the risk of climate change.

Modification of postcombustion CO2 capture process: A techno‐economic analysis

AbstractPostcombustion CO2 separation using aqueous amine solution has a great potential to minimize CO2 emissions but is expensive due to huge energy requirement for solvent regeneration. Several structural modifications can be implemented to minimize the regeneration energy requirement and optimize the energy efficiency. In this study, we evaluated the techno‐economic benefits of three stripping modifications, namely lean vapor compression (LVC), stripper overhead exchanger (SOE), and an advanced hybrid configuration (LVCSOE) in a single flowsheet aimed at reducing the energy consumption of CO2 separation process using 30 wt.% monoethanolamine (MEA) solution. All the configurations were simulated using Aspen Plus® rate‐based modeling, while capital investment was evaluated using Aspen Economic Analyzer®. All the modifications reduced the energy consumption and showed economic benefit compared to the base case. The optimal configuration was LVCSOE, which reduced the energy requirement for solvent regeneration and the CO2 capture cost by 18% and 5.3%, respectively, and can save 5.4 million USD annually. Additionally, sensitivity analysis of economic variables suggested that CO2 capture cost is more sensitive to regeneration steam cost than any other economic parameter. Furthermore, the effect of regeneration steam cost revealed that the implementation of an advanced process configuration can result in higher net savings as compared to the base case at high fuel price. © 2020 Society of Chemical Industry and John Wiley & Sons, Ltd.

Unusually Low Heat of Adsorption of CO2 on AlPO and SAPO Molecular Sieves.

The capture of CO2 from post-combustion streams or from other mixtures, such as natural gas, is an effective way of reducing CO2 emissions, which contribute to the greenhouse effect in the atmosphere. One of the developing technologies for this purpose is physisorption on selective solid adsorbents. The ideal adsorbents are selective toward CO2, have a large adsorption capacity at atmospheric pressure and are easily regenerated, resulting in high working capacity. Therefore, adsorbents combining molecular sieving properties and low heats of adsorption of CO2 are of clear interest as they will provide high selectivities and regenerabilities in CO2 separation process. Here we report that some aluminophosphate (AlPO) and silicoaluminophosphate (SAPO) materials with LTA, CHA and AFI structures present lower heats of adsorption of CO2 (13–25 kJ/mol) than their structurally analogous zeolites at comparable framework charges. In some cases, their heats of adsorption are even lower than those of pure silica composition (20–25 kJ/mol). This could mean a great improvement in the regeneration process compared to the most frequently used zeolitic adsorbents for this application while maintaining most of their adsorption capacity, if materials with the right stability and pore size and topology are found.

CO2 separation from binary mixtures of CH4, N2, and H2 by using SSZ-13 zeolite membrane

Due to the importance of gas mixture composition in CO2 separation process and the lack of sufficient studies in the literatures for SSZ-13 zeolite membrane, in this paper, the effect of various mixed gas compositions was investigated in CO2 separation from light gases like CH4, N2, and H2 by using a synthesized SSZ-13 zeolite membrane. Single gas permeance was measured for CO2, N2, CH4 and H2 in a wide range of temperature (30–80 °C), feed pressure (up to 600 kPa) and different feed composition for gas mixtures (25:75, 50:50, 75:25). The results of single gas showed really good performance, i.e., CO2 permeance of 7.34 × 10-7 mol m−2 s−1 Pa−1 and CO2/CH4 selectivity of 60 at 30 °C and 200 kPa of feed pressure. For equimolar mixed gas, the CO2 permeance was almost the same for single gas while the CH4 permeance was reduced by 75% and hence CO2/CH4 selectivity was increased by three times, i.e., from 60 to 183. Similarly, the selectivity of CO2/N2 and CO2/H2 were doubled and increased by more than 5 times, respectively. For other compositions (25:75, 75:25) the CO2/CH4, CO2/N2 and CO2/H2 mixture selectivity were decreased with increase in CO2 concentration of feed keeping always higher gas selectivity than the single gas tests.

Improving energy efficiency for a low-temperature CO2 separation process in natural gas processing

Conventional amine sweetening process is limited to treating gas with high content of CO2, due to significant energy demand for the regeneration of solvent and the compression of CO2 product for Enhanced Oil Recovery (EOR) or sequestration. Although distillation processes operating at sub-ambient conditions have been regarded as an economic and energy-efficient alternative to amine sweetening process, it is not straightforward to materialize the full benefits of the low temperature distillation process in practice because of complex design interactions existed. The distillation process for carbon dioxide separation operated at sub-ambient conditions are modeled with commercial simulator Aspen HYSYS®. A range of thermodynamic packages are screened for the selection of the most appropriate one to be used, while the validation of the process modeling is made with reference data. Understanding on the dependence of energy cost on the key design and operating variables is obtained with sensitivity studies, with which energy-efficient selection of column configurations and operating conditions throughout the process is made. Suggestion is also made for improving energy efficiency for the process without compromising separation process, by setting different operating pressure and introducing new configuration involving stream splitting and merging.

Efficient CO2 sorption in phosphonium-based organic salts

CO2 sorption in ionic liquids (ILs) has been subject of attraction for scientists owing to potential use of ILs in CO2 capture and separation processes for industrial application. The current study addresses investigation of gas-solid equilibrium of four novel ILs based on phosphonium (tetraphenyl phosphonium [PhP], benzyltriphenyl phosphonium [bnPhP], (methoxymethyl)triphenyl phosphonium [OMeMePhP], (cyanomethyl) triphenyl phosphonium [CNMePhP]) as cation sources with 2-acrylamido-2-methylpropanesulfonate [AMPS] anion. The current study affords insight outcomes of CO2 sorption at pressures up to 4 MPa and 298.5 K. Among the studied quaternary phosphonium based salts, [bnPhP][AMPS] displayed the highest capability in terms of CO2 sorption by showing 0.7735 mole fraction at 1 MPa and 298.15 K. The molar volumes of respective ILs were estimated from experimentally determined densities for studying molar volume-CO2 sorption relationship. The DFT studies showed that higher interactional energies, negative Gibb's free energy and lower ∆EHOMO lead to higher CO2 sorption. The present study provides an in depth study to understand the structure-activity relationship among molar volumes and CO2 sorption of investigated ILs and explores the ways for enhanced CO2 sorption.

A Comparative Assessment of Emerging Solvents and Adsorbents for Mitigating CO2 Emissions From the Industrial Sector by Using Molecular Modeling Tools

Some specific examples are presented showing the possibilities offered by molecular modelling tools to obtain relevant data at process conditions while also gaining molecular insights on the techniques used for CO2 capture and separation. Two different technologies, absorption with amine-based systems and adsorption on porous materials, were explored, using the molecular-based equation of state, soft-SAFT, and Grand Canonical Monte Carlo simulations, respectively. The aqueous monoethanolamine (MEA) system was used as the benchmark for absorption and compared to the performance of eight alternative amine-based systems, while sixteen adsorbents belonging to different families (zeolites, Metal Organic Frameworks, silicas and activated carbons), bare or functionalized with alkylamines, were investigated for the separation of CO2 by adsorption. In addition to obtaining molecular information on the CO2 capture process, the models were further used to examine the CO2 capture performance in terms of cyclic working capacity and energy index as key performance indicators, allowing the identification of promising systems that can improve the current ones to be further evaluated for separation in non-power industries. Results show that for the same total amine mass concentration, non-aqueous amine solvents possess a 5–10% reduction in cyclic working capacity, with a 10-30% decrease in the energy index compared to their aqueous counterparts, due to lower heat of vaporization and sensible heat. It has also been obtained that M-MOF-74 and zeolites NaX and NaY structures offer the best results for adsorption in TSA processes. Some adsorbent structures achieved similar values of energy requirement to the ones obtained for alternative amine-based systems (2-2.5 MJ∙kgCO2-1), although the disadvantage of the TSA process versus absorption should be taken into account. These results confirm the reliability of the molecular modelling approach as an attractive and valuable screening tool for CO2 capture and separation processes.

Technology readiness assessment of ultra-deep salt caverns for carbon capture and storage in Brazil

This article presents a Technology Readiness Assessment (TRA) of a new concept called the Salt Cavern Hybrid Subsea Carbon Capture and Storage (CCS) System, which performs all the offshore natural gas and CO2 separation process with subsequent storage in offshore underground salt caverns. Currently there is a demand for CCS of large quantities of CO2 associated with CH4 in the pre-salt offshore oil fields in Brazil. The pre-salt reservoirs have as caprock 2000 m of continuous rock salt. This hybrid system is expected to perform, at the same time, the separation between the natural gas and CO2, and Carbon Capture and Storage of CO2, allowing the monetization of the separated natural gas. The Technology Readiness Levels (TRL) approach is discussed in this paper for estimating the maturity of the CCS System. The TRL analysis concluded that no technological gaps were identified that would made the project unfeasible and the TRL level enables the project to advance to the field test stage within a reasonably short time horizon. Once implemented it could be one of the largest CCS projects in the world. Also, this paper describes the conceptual design of this hybrid system and presents the results of a TRA showing the methodology that was employed in the process, the technology critical items that were analyzed and the results obtained for each of them and the design of a salt cavern for the storage of 1 billion Sm3 (Standard cubic meter) of a natural gas stream with high CO2 content.

Comprehensive 3E analysis and multi-objective optimization of a novel process for CO2 capture and separation process from syngas

The traditional synthesis gas (syngas) production process in the coal chemical field encounters the problems of high cold energy consumption and difficulty in effectively capturing CO2. This limits the clean production and sustainable development of coal chemical industry. To solve this problem, this paper proposes a novel process for capturing and separating CO2 from syngas using [bmim][Tf2N]. This process can effectively reduce the cold energy consumption and improve the CO2 capture efficiency, which will help relieve the global concerns over CO2 emissions. Energy, economic, and environmental analyses of the process were conducted based on accurate modeling and simulation results. To balance the conflict between the economic and environmental performances, the non-dominated sorting genetic algorithm II method was used for the multi-objective optimization of the process. The CO2 escape flow rate and total annual cost were the objective functions of the multi-objective optimization scheme and had values that were 5.9% and 1.5% higher than their minimum values, respectively. Moreover, the multi-objective optimization scheme for this process was compared with the Rectisol process and CO2 capture from syngas using [emim][Tf2N]. This work provided new ideas for clean production of coal chemical industry, and also provided reference for the green sustainable development of relevant work.

A novel ternary mixed matrix membrane comprising polyvinyl alcohol (PVA)-modified poly (ether-block-amide)(Pebax®1657)/graphene oxide nanoparticles for CO2 separation

A novel ternary mixed matrix membrane (MMM) with different amounts of filler loading (2, 4 and 6 wt.%) was fabricated, in which the synthesized Graphene Oxide (GO) nanoparticles incorporated into a polyvinyl alcohol (PVA) modified poly (ether-block-amide) (Pebax®1657). PVA as an affordable additive provides a suitable affinity to separate CO2. Moreover, the presence of GO within the Pebax matrix causes an extra intermolecular space which enhances the CO2 permeability through the MMMs. In this study, pure Pebax membrane was modified via adding different amounts of PVA (0–20 wt. %). The results showed that the CO2 permeability increased from 79.42 barrer (for neat Pebax) to 81.24 barrer (for Pebax/PVA (10 wt.%)) and 90.7 barrer (for Pebax/PVA(15 wt.%)) and also the CO2/CH4 selectivity increased from 12.37 (for neat Pebax) to 16.41 (for Pebax/PVA (10 wt%). Furthermore, the CO2/N2 selectivity dramatically increased (from 36.93 for neat Pebax to 74.34 for Pebax/PVA(15 wt.%) at the pressure of 2 bar and temperature of 30 °C. The synthesized GO nanoparticles were incorporated (2, 4 and 6 wt. %) into the both Pebax/PVA(10 wt.%) and Pebax/PVA(15 wt.%) matrix to fabricate the Pebax/PVA/GO MMMs. The results showed that the Pebax/PVA (10 wt.%)/GO (6 wt.%) with the CO2 permeability of 236.48 barrer and CO2/CH4 selectivity of 33.63 and also Pebax/PVA(15 wt.%)/GO (6 wt.%) with CO2 permeability of 228.34 barrer and CO2/N2 selectivity of 124.09 implied the best performance among all the prepared membranes for CO2/CH4 and CO2/N2 separation, respectively. The Pebax/PVA/GO MMM indicates promising applications in CO2 separation processes.

Eliminating carbon dioxide emissions at the source by the integration of carbon dioxide capture and utilization over noble metals in the liquid phase

Carbon dioxide (CO2) capture and utilization (CCU) offer a response to greenhouse gas emissions whereas they are often conducted separately, resulting in a high energy demand for the CO2 separation process. The capture reagent chemically binds the CO2 molecule, activating the stubborn CO2 to a more active species. The direct conversion of the captured and activated CO2 to the value-added chemicals will simplify the CO2 utilization process, leading to a strong energy-saving effect by omitting the CO2 separation process. In this paper, the commercial and the self-synthesized noble metal catalysts were evaluated in the hydrogenation of amine captured CO2 in ethanol at 140–165 °C, which is demonstrated to produce the main product methanol in the presence of K3PO4 or using MgO as a catalyst support. The Pd-based catalyst was superior to the Rh, Pt or Ru based catalyst in the hydrogenation of amine captured CO2 towards methanol. The superior Pd/MgO catalyst was characterized by XRD, XPS, SEM, HRTEM, and DRIFTS analysis. NMR measurement and the ATR FTIR measurements were used to determine the initial intermediate to be ethyl carbonate. Mechanistic insight to the methanol formation indicates that the synergistic effect of Pd and a base cascaded the reactions: the reduction of ethyl carbonate to formic acid, the dehydration between formic acid and ethanol to form ethyl formate, and the hydrogenolysis of ethyl formate to methanol and ethanol. The ethyl formate intermediate was hydrogenated to methanol by Pd, wherein basic condition (K3PO4 or MgO) was responsible for the activation of the carbonyl group of the ethyl formate.

Preparation and characterization of POSS-PEG high performance membranes for gas separation

The efficient CO2 separation process depends on the trade-off among permeability and selectivity requirements. In this work, copolymers of polyhedral oligomeric silsesquioxanes (POSS) with cage-like rigid structure and polyethylene glycol (PEG) with good CO2 affinity were synthesized by introducing allyl-POSS and allyl-EO into the side chain of polymethylhydrosiloxane (PMHS) in different proportions. The POSS80PEG20 copolymer fashioned into membrane showed good CO2 separation performance (permeability of 679 barrer and CO2/N2 selectivity of 38.1). The effect of POSS content on morphology, thermal stability and mechanical properties was also investigated. Multilayered composite membranes using POSS80PEG20 copolymer of different concentration as a selective layer, polyacrylonitrile (PAN) support layer and polydimethylsiloxane (PDMS) middle layer were also fabricated to achieve improved mechanical stability. The composite membrane with selective layer concentration of 0.25 wt% (POSS-PEG-0.25) offered optimum CO2/N2 and CO2/O2 selectivity performances. Moreover, the effect of feed pressure on mixed gas permeance was also reported.

Solar-assisted CO2 capture with amine and ammonia-based chemical absorption：A comparative study

Intensive energy penalty caused by CO2 separation process is a critical obstacle for retrofitting power plant with carbon capture technology. Therefore, the concept of utilizing solar energy to assist solvent regeneration for post-combustion carbon capture power plant is proposed recently as a promising pathway to compensate the efficiency reduction derived from CO2 capture process. However, the feasibility of solar-assisted post-combustion technologies largely depends on the types of CO2 absorbent, categories of solar thermal collectors, areas of solar field, and the integration of thermal energy storage system. Therefore, this paper conducts a comparative analysis on monoethanolamine-based and NH3-based so-larassisted post-combustion power plants employing two types of solar collectors, i.e the vacuum tube and the parabolic through collector, with climate data of Tianjin City, China. Levelized costs of electricity and cost of CO2 removed are comparatively studied for both solar-assisted post-combustion configurations. Results show that the proposed solar-assisted post-combustion configurations are economically viable when the price of vacuum tube is lower than 86.64 $/m2 and 117.29 $/m2 for the monoethanolamine-based and NH3-based solar-assisted post-combustion power plant, respectively. Meanwhile, the price of parabolic through collector should be less than 111.12 $/m2 for the monoethanolamine-based and 114.51 $/m2 for the NH3-based solar-assisted post-combustion power plant. It is indicated that employing the vacuum tube for chilled NH3-based solar-assisted post-combustion power plant offers a promising approach to reduce the energy penalty with attractive economic performance.

Origin of CO2-philic Sorption by Graphene Oxide Layered Nanosheets and Their Derivatives.

Graphene oxide (GO) is a promising 2D material for adsorbents and membranes, in particular, for the CO2 separation process. However, CO2 diffusion and sorption in GO and its layered structures are still not well understood because of its heterogeneous structure. Here we report CO2 sorption in GO and its derivatives (e.g., reduced GO (rGO)) in powders and films. These CO2 sorption behaviors reveal that GO is highly CO2-philic via complex CO2-functional-group-surface interactions, as compared with graphite and rGOs. Even in highly interlocked, lamellar GO films, CO2 molecules above a certain threshold pressure can diffuse into GO interlayers, causing GO films to swell and leading to dramatic increases in CO2 sorption. Intercalated water in GO interlayers can be removed by preferential CO2 sorption without any changes in the GO chemical structure. This finding helps to explain the origin of CO2 affinity with GO and has implications for preparing anhydrous GO assemblies for various applications.

Effect of water on high-pressure ternary phase equilibria of CO2 + H2O + alkanolamine based ionic liquid

Some ethanolamine or hydroxylammonium based ionic liquids have shown great potential in CO2 separation processes. However, not much is known about the influence of water on the CO2 solubility of these liquids. In this paper, we study the high-pressure ternary liquid-vapor phase equilibria. The systems were composed of carbon dioxide, water, and an alkanolamine based IL: N-methyl-2-hydroxyethylammonium propionate [m-2HEA][Pr]. We studied systems whose water contents varied from 6.7% to 52.5%, temperatures from 313 K to 353 K, and pressures from 0.6 MPa up to 22 MPa. The phase equilibria experiments showed that the amount of ionic liquid in the mixture controls the solubilization of CO2 and is not significantly affected by changes in the water content within the studied range. These data were simulated from a molecular point of view using the Gibbs ensemble Monte Carlo method. A force field was estimated to describe the Ionic Liquid (IL) density at a wide range of water content values using the isothermal−isobaric Monte Carlo (NPT-MC). The calculated densities presented a good agreement with experimental data, indicating that the proposed force field parameters are suitable to describe the densities of the IL mixtures and, therefore, can be used to simulate the ternary phase equilibria. The software package CassandraV1.2 was employed to simulate the ternary phase equilibria, resulting in reasonably low deviations when compared to the experimental data. However, the predicted solubility of carbon dioxide in N-methyl-2-hydroxyethylammonium propionate [m-2HEA][Pr] was slightly higher when compared with the experimental values.

IR Monitoring of Absorbent Composition and Degradation during Pilot Plant Operation

The monitoring of the absorbent during the operation of CO2 separation processes is a necessary and challenging task. The most common absorbent used is an aqueous amine solution. Traditional approa...

Observation of distinct structural transformation between sI and sH gas hydrates and their kinetic properties during CO2 capture from N2 + CO2

sH hydrate has a deal of attention as an attractive medium of gas storage and separation due to its relatively milder formation condition and higher storage capacity, and thus sH hydrate has focused on the potential application in the post-combustion CO2 capture. Nonetheless, in-depth investigations on the thermodynamic stability of sH hydrate of N2 + CO2 and the possible occurrence of structural transformation during the process have not yet been addressed. Since the gas hydrate-based CO2 capture technology involves stepwise enrichments of CO2 through iterative formation-dissociation processes of CO2 hydrate, knowledge about the thermodynamic stability between sI and sH hydrates in the presence of various N2:CO2 ratios and their kinetic properties is important for designing the gas hydrate-based CO2 separation process. Here, we explored sI and sH hydrates of 3,3-dimethyl-1-butanol + N2 + CO2 focusing on their structural stability and structure-dependent kinetic properties. The experimental data including P–T phase equilibria, induction time, gas uptake, and CO2 separation factor are provided with a structural analysis via synchrotron high-resolution powder diffraction.

Overview of integrated PVA-membrane with Zn-cyclen for CO2 separation

Carbon dioxide (CO2) is a greenhouse gas that produces from the combustion of fossil fuel. The consumption of fossil fuel in industrial activity has increased the concentration of CO2 emitted in the atmosphere. When the concentration of CO2 increases, the more heat are released. Thus, creating the global warming issue and climate change to the world. This climate change and global warming issue have attract the attention of worldwide. There are lot of carbon capture techniques proposed to overcome these problems. However, most of it are costly, and need a long dissociation and CO2 separation process. Therefore, innovative technique and process optimization are needed in order to improve the process efficiency of this technology. The most common techniques used in this technology are cryogenic, biological technique, and membrane technique. Membrane technique with a biological approach has promising high CO2 separation performance. This mimic enzyme based membrane has several advantages such as low cost, simple production procedure and high CO2 separation performance. From the review, the use of PVA membrane integrated with mimic enzyme could be work together towards the improvement of carbon capture technology. This review provides the information and potential of an alternative approach of carbon capture technology to reduce the amount of CO2 emitted from the fossil fuel industry.