Amine Solutions Research Articles

Experimental measurements of CO2 solubility, viscosity, density, sound velocity and evaporation rate for 2-(2-aminoethoxy)ethanol (DGA) + 1-methylpyrrolidin-2-one (NMP) / water + ionic liquid systems

Among technologies used to remove carbon dioxide and hydrogen sulfide from natural gas and flue gas emissions, absorption processes based on amine solvents are the most common. This study investigated the potential of new hybrid amine solutions to absorb carbon dioxide compared to conventional solvents. The solubility of carbon dioxide in hybrid solvents with different mixtures of diglycolamine, water, n-methyl-2-pyrrolidone, 1-butyl-3-methylimidazolium trifluoromethanesulfonate and 1-butyl-3-methylimidazolium bis(trifluoromethanesulfonyl)imide was measured at temperatures of (∼298.15 and ∼313.15) K by a static-synthetic method. Furthermore, the viscosity, density, sound velocity and evaporation rate for the mixtures were measured. Although the addition of an ionic liquid to the solvents increased the viscosity of the solution and decreased the solubility with the aqueous diglycolamine solvents, the replacement of water with a mixture of n-methyl-2-pyrrolidone and ionic liquid increased the solubility. The exception however was observed at lower pressures.

An experimental/computational study of steric hindrance effects on CO2 absorption in (non)aqueous amine solutions

AbstractThe reaction kinetics and molecular mechanisms of CO2 absorption using nonaqueous and aqueous monoethanolamine (MEA)/methyldiethanolamine (MDEA)/2‐amino‐2‐methy‐1‐propanol (AMP) solutions were analyzed by the stopped‐flow technique and ab initio molecular dynamics (AIMD) simulations. Pseudo first‐order rate constants (k0) of reactions between CO2 and amines were measured. A kinetic model was proposed to correlate the k0 to the amine concentration, and was proved to perform well for predicting the relationship between k0 and the amine concentration. The experimental results showed that AMP/MDEA only took part in the deprotonation of MEA‐zwitterion in nonaqueous MEA + AMP/MEA + MDEA solutions. In aqueous solutions, AMP can also react with CO2 through base‐catalyzed hydration mechanism beside the zwitterion mechanism. Molecular mechanisms of CO2 absorption were also explored by AIMD simulations coupled with metadynamics sampling. The predicted free‐energy barriers of key elementary reactions verified the kinetic model and demonstrated the different molecular mechanisms for the reaction between CO2 and AMP.

Zn ion-modulated polyamide membrane with enhanced facilitated transport effect for CO2 separation

Polyamide membrane, fabricated via interfacial polymerization process, is a typical class of facilitated transport membrane for CO2 separation with amino groups serving as reactive CO2 carriers. Herein, to further enhance the CO2-facilitated transport effect of polyamide membrane, Zn(NO3)2 is directly introduced into aqueous triethylenetetramine phase for constructing Zn-N coordination polyamide membrane taking advantage of the coordination interaction between Zn ions and amino groups from triethylenetetramine. The good solubility of Zn(NO3)2 in aqueous amine solution and moderate coordinative ability of Zn ions are beneficial to a uniform distribution of Zn in polyamide layer. The coordination of N from triethylenetetramine monomer to Zn ion centre produces more tertiary amino groups and free amino groups with stronger affinity to CO2 in Zn-N coordination membrane for enhancing the facilitated transport effect. Additionally, the Zn-N coordination interaction generates smoother surface of membranes when sufficient Zn ions are introduced. The membrane with 0.1 wt% of Zn ions in aqueous phase exhibits the highest CO2/N2 and CO2/CH4 selectivity of 106.7 and 55.2, which increase, respectively, by 75.2% and 99.3% without compromising CO2 permeance in contrast with pristine polyamide membrane.

Performance analysis of natural gas sweetening unit with amine solution and blends

In this study, raw natural gas data from Uch gas field located in Dera-Bugti of Balochistan, Pakistan is simulated for performance analysis over amine absorber unit in Aspen HYSYS V9.0. The primary amine, MDEA was selected to remove bulk CO2 and reduce H2S to ppm level, where secondary amines, MEA, DEA and Sulfolane were selected to observe CO2 levels in sweet gas. The primary amine in isolation and blend with secondary amine was simulated and analysed over absorber performance. The absorber performance is reported as CO2, H2S and water content in sweet gas, hydrocarbons in rich amine and its temperature. MDEA in isolation resulted in minimum 14.13 and 12.78 mol% CO2 in sweet gas and rich amine temperature of 81.11oC and 82.13oC with 24 and 30-Trays, respectively at 2500 m3 /h of lean amine recirculation rate. Among the tested blends, MDEA/MEA, MDEA/Sulfolane showed no significant improvement on absorber performance compared to isolated MDEA. However, MDEA/DEA blends indicated that CO2 in sweet gas can be reduced to 12.07, 3.41, 1.85 mol% with rich amine temperature of 89.05, 111.72 and 124.80oC, respectively. The lowest CO2 detected of 1.85 mol% was achieved with 40 mol% MDEA and 15 mol% DEA blend at 2500 m3 /h recirculation rate and rich amine temperature of 124.80oC. The results indicated that MDEA/DEA blend has the potential to attain CO2 of less than 2 mol%. The higher rich amine temperature raise concern that can be resolved by using heat stabilized salt.

Fabrication of polypyrrole-graphitic carbon nitride nanocomposite containing hyper-cross-linked polyamide photoresponsive membrane with self-cleaning properties for water decontamination and desalination applications

A new photoresponsive hyper-cross-linked polyamide thin film nanocomposite nanofiltration membrane was fabricated by incorporating polypyrrole-graphitic carbon nitride (PPy@G-CN) nanocomposite photo-catalyst through interfacial polymerization for water decontamination and desalination applications. An ultrafiltration polysulfone/polyethylene terephthalate (PSf/PET) membrane support was prepared through phase inversion and a hyper-cross-linked PPy@G-CN/polyamide active layer was fabricated on the PSf/PET by using N,N-bis(2-aminoethyl)-1,3-propanediamine (as an aqueous amine) and terephthaloyl chloride (TPC as a non-aqueous solution) while different amounts of PPy@G-CN nanocomposite photo-catalyst were homogeneously dispersed in aqueous amine solution before interfacial polymerization reaction and three fabricated membranes were named as x%-PPy@G-CN/HCPAMs. Out of the three fabricated membranes, 0.10%-PPy@G-CN/HCPAM was found to be the best performing membrane in terms of flux and % rejection. The maximum water flux of the membrane was found to be 78.57 L m−2 h−1 at 25 bars with rejection of Eriochrom Black T (EBT) approaching 99.90% at 20 bar. Moreover, the 0.10%-PPy@G-CN/HCPAM also showed a remarkable rejection of 79.58% and 72.88% for MgSO4 and NaCl, respectively. The 0.10%-PPy@G-CN/HCPAM showed exceptionally high photocatalytic self-cleaning as all of the organic fouling (coloration) due to EBT was removed under simulated solar light irradiation for 1 h leading to photocatalytic degradation of EBT. The 0.10%-PPy@G-CN/HCPAM membrane remained physically intact even after elongated exposure to light source.

Sensitive 1,1-dicyanovinyl push-pull dye for primary amine sensing in solution by fluorescence

1,1-dicyanovinyl push-pull dye PTTCN undergoes rapid and reversible aza-Michael addition with volatile primary aliphatic amines in solution in DMSO, yielding highly fluorescent imine derivatives. This reaction is accompanied by a dramatic colour change as well as a strong increase in fluorescence (1200-fold increase) allowing sensitive turn-on detection of primary amine in solution. In the solid state, PTTCN is emissive and reaction with primary amine vapours results in a shift in fluorescence and a possible ratiometric detection of primary amines. The selectivity is excellent for primary amines over secondary, tertiary and aromatic amines as well as over thiols and fluorescence spectroscopy allows to discriminate between primary amines and other nitrogen nucleophiles such as hydrazine and ammonia. Finally, we show as proof-of-concept that the fluorescence turn-on reaction can be used in response to the vapours of volatile amines released during food spoilage.

Increasing the the efficiency of the collective action of amines by the use of foaming agents combination

A research on the process of enrichment of potash ore using a collective mixture based on higher aliphatic amines, pine oil, and polyethylene glycol (PEG-400) has been carried out. Comparative flotation studies using pine oil and PEG-400 have shown the effectiveness of combined use of these reagents. The effect of adding foaming agents on the micellar structure of amine solutions and the adsorption of amine on the surface of potassium chloride was proved by colloidalchemical methods. It was shown that the introduction of a combination of pine oil and PEG-400 makes it possible to extract 90.3% of potassium chloride into a concentrate at content 87.0 % of potassium chloride. Recovery rates when using a combination of foaming agents are higher than those for adding only one of the foaming agents to the collective mixture. Thus, the best performance was achieved by using a combination of foaming agents. The optimal consumption in laboratory conditions for pine oil and PEG-400 was 10 g/t of ore.

Elucidating the Effect of Aliphatic Molecular Plugs on Ion-Rejecting Properties of Polyamide Membranes.

Polyamide RO membranes are widely used for seawater desalination owing to their high salt rejection and water permeability; however, improved selectivity-permeability trade-off is still desired. "Molecular plugs," small molecules immobilized within the polyamide structure, offer an attractive approach; however, their overall effect on polyamide physicochemical properties poses many questions. Here, we analyze the effect of decylamine, a promising plug, and a few charged and uncharged mimics on polyamide films using several in situ techniques. Electrochemical impedance spectroscopy (EIS) reveals a complex pH-dependent response, whereby, upon exposure to amine solution, conductivity first rapidly drops; however, under alkaline conditions, when amine is uncharged, the trend subsequently slowly reverses, and conductivity increases. This slow reversal was observed for noncharged alcohols of similar size as well, but not for larger surfactant molecules. The reversal was assigned to the uptake of plug molecules within polyamide, as opposed to the fast initial drop assigned to surface adsorption. EIS and quartz-crystal microbalance (QCM) results showed that exposure to decylamine under alkaline conditions ultimately led to an irreversible decrease in conductivity, that is, stronger ion rejection, remaining after re-exposure of polyamide to amine-free buffer. This suggests that plug uptake within polyamide resulted in polymer stress, indeed observed in surface stress measurements, and subsequent relaxation. The results indicate that the moderate size of decylamine and conditions minimizing its charge were optimal for irreversible change; however, charge interactions helped maximize its binding within polymer and induce the desired sustained change in selectivity. The results have many potential implications for improving current membrane desalination technology and increasing inherent membrane selectivity toward hard-to-remove species.

A graphical approach for mixed ratio optimisation in the binary mixed amine solution

Chemical absorption method plays an important role in the process of CO2 separation. One major problem for chemical absorption is huge energy consumption, which is affected by the performance of absorbents. Developing a type of absorbent with high absorption capacity and low regenerative energy consumption is a research topic that attracts attention. The combination of two or more amines is one way to develop new solvents. However, the change of amine liquid ratio can cause a series of complex nonlinear changes in absorption capacity, absorption heat, the heat of vaporisation and sensible heat. It is of interest to visualise the amine solution mixing ratio optimisation to help reduce the energy consumption and increase the absorption capacity. Derivative analysis of standardised vs variables diagram (DSVD), a kind of graphical method based on maximum benefit and minimum consumption, is proposed to determine the optimal mixing ratio of binary amine solution. This novel approach helps to visualise what kind of amines are not suitable for compounding, what kind of amines have the best compounding ratio, and how to determine the optimal compounding ratio. The optimal mixing ratio of the Methyldiethanolamine (MDEA) - Piperazine (PZ) system and MDEA - Monoethanolamine (MEA) were optimised by this method. The optimal ratio of MDEA - PZ and MDEA - MEA are 0.6 (PZ: MDEA = 0.6:0.4, wt.%) and 0.8 (MEA: MDEA = 0.8:0.2, wt.%).

Removal of heat-stable salts from lean amine solution using bipolar membrane electrodialysis

Traditional resin exchange processes for the removal of heat-stable salt (HSS) from lean amine solutions have limited efficiency, and require large amount of alkali for regeneration, causing a serious negative impact on the sustainable environmental development. In this study, a new bipolar membrane electrodialysis (BMED) process was proposed to replace the original resin-based method for the removal of HSS from practical lean amine liquids (from a natural gas factory of PetroChina Company). The experimental conditions of current density, volumetric ratio, HSS concentration, and etc., were systematically investigated. It was found that a high HSS removal efficiency of up to 95.7% with an extremely low loss rate of the organic amine of down to 1.39% can be obtained, under the optimal current density of 60 mA/cm 2 . A continuous operation verified the long-term stability of BMED for a high-efficiency HSS removal rate of up to 80.3% after a 600-h duration. From the findings in this study, we develop a conceptual exploration describing the BMED process for the separation of HSS from practical desulfurization wastewater, beyond the lean amine liquids, offering a guidance for their potential industrial applications. • A zero-discharge process was proposed for the removal of heat-stable salt. • A variety of process conditions were explored for the impact of HSS separation. • The removal of HSS was over 95%, which is acceptable for industrial scale.

Stable Metal–Halide Perovskite Colloids in Protic Ionic Liquid

Stable Metal–Halide Perovskite Colloids in Protic Ionic Liquid

The stability of metal-organic framework MIL-101(Fe) in alkylol amine solutions

<p indent=0mm>The stability of metal-organic frameworks (MOFs) in liquid phase systems is important for their applications in different fields. Herein, the stability of iron-based MOF MIL-101(Fe) in alkylol amine solutions was studied. MIL-101(Fe) was treated in alkylol amine solutions for different time and the samples obtained were characterized by X-ray diffraction, scanning electron microscopy, transmission electron microscopy, infrared spectroscopy, X-ray photoelectron spectroscopy and X-ray dispersion spectroscopy. The results show that under the experimental conditions, the crystal structure of MIL-101(Fe) partially collapses, followed by the formation of alkylol ammonium terephthalate. The possible mechanism was proposed according to Lewis acid and base theory.

Developing versatile and highly selective chemosensor for amines detection based on bis-thiophene methane containing cyclopalladated compounds

Cyclopalladated compounds (CPCs) have special properties due to its internal multiple conjugate planes in their structure. Herein, a series of bis-thiophene methane-pyridine-Schiff base derivatives (Ln) and their CPCs (Ln-Pd) as monomers were prepared. All cyclopalladated monomers showed extreme sensitivity to organic amines in both solution and vapor states. The results of structural analysis manifested that the complexes before and after alkali-treated have a relationship between monomer and dimer. Furthermore, the base-induced mechanism was expounded. To take full advantage of this feature, we utilized the monomer containing tetraphenylethylene (L4-Pd) to detect organic amines in solution, which showed excellent sensitivity toward triethylamine and diethylamine with the limit of detection of 41 nM and 104 nM, respectively. Then, the L4-Pd coated labels were exposed to amine vapors at ppm level, which showed visible color variation in n-butylamine, ethylenediamine, diethylamine, and cyclohexylamine atmosphere. It is suggesting that the materials have potential applications to detect organic amines in solution at trace analysis and a solid colorimetric chemosensor for organic amine vapors.

Large-Area Synthesis of Ultrathin, Flexible, and Transparent Conductive Metal-Organic Framework Thin Films via a Microfluidic-Based Solution Shearing Process.

Iminosemiquinone-linker-based conductive metal-organic frameworks (c-MOFs) have attracted much attention as next-generation electronic materials due to their high electrical conductivity combined with high porosity. However, the utility of such c-MOFs in high-performance devices has been limited to date by the lack of high-quality MOF thin-film processing. Herein, a technique known as the microfluidic-assisted solution shearing combined with post-synthetic rapid crystallization (MASS-PRC) process is introduced to generate a high-quality, flexible, and transparent thin-film of Ni3 (hexaiminotriphenylene)2 (Ni3 (HITP)2 ) uniformly over a large-area in a high-throughput manner with thickness controllability down to tens of nanometers. The MASS-PRC process utilizes: 1) a micromixer-embedded blade to simultaneously mix and continuously supply the metal-ligand solution toward the drying front during solution shearing to generate an amorphous thin-film, followed by: 2) immersion in amine solution for rapid directional crystal growth. The as-synthesized c-MOF film has transparency of up to 88.8% and conductivity as high as 37.1 S cm-1 . The high uniformity in conductivity is confirmed over a 3500 mm2 area with an arithmetic mean roughness (Ra ) of 4.78nm. The flexible thin-film demonstrates the highest level of transparency for Ni3 (HITP)2 and the highest hydrogen sulfide (H2 S) sensing performance (2,085% at 5ppm) among c-MOFs-based H2 S sensors, enabling wearable gas-sensing applications.

Investigation of Alkanol-Amine Solvents and their Blends for CO2 Removal from Natural Gas using Aspen-Hysys

The removal of carbon dioxide (CO2) from natural gas is vital towards meeting pipeline sales gas specifications and evading operational complications during the liquefaction of natural gas. Therefore, the removal of CO2 from natural gas is necessary for the efficient utilization of natural gas and for the reduction of global CO2 emission. It is also vital for the effective liquefaction process in the liquefied natural gas project A common and widespread technique used at natural gas plants in Nigeria is the removal of carbon dioxide (CO2) from natural gas through chemical absorption using alkanolamine solutions. In this research, an amine sweetening process is simulated using Aspen HYSYS V10 with a typical Nigerian natural gas composition. The simulation is used to investigate four different kinds of amines and their blends (mixed amines). The investigated amines are Monoethanolamine (MEA), Diethanolamine (DEA), Diglycolamine (DGA) and Methyldiethanolamine (MDEA) while the blends are MDEA + MEA, MDEA + DEA and MDEA + DGA. Results obtained from the simulation show that the mixed amine “MDEA + MEA” with lean amine strength of 11% MEA and 39% MDEA, absorbs 99.97% of CO2 present in the gas and hence, amine blends absorb carbon dioxide from natural gas better than the individual amines. It was also concluded that increasing the composition of the primary or secondary amine while decreasing the composition of the tertiary amine in the lean amine solution (amine blend) led to an increase in the amount of CO2 being absorbed. The study provides useful information on the absorption of CO2 using alkanolamine solvents and their blends in a standard amine sweetening plant.

Atmospheric Dispersion of Gaseous Amine Emitted from Absorption-Based Carbon Capture Plants in Saskatchewan, Canada

Carbon capture and storage (CCS) is a key strategy to reduce carbon dioxide (CO2) emissions from industrial point sources. Gas absorption into aqueous amine solutions is an immediate technology for carbon capture that has been tested in many demonstration plants. One concern of using the amine-based carbon capture process is the environmental impacts and health risk caused by emissions of gaseous amines from the process to the atmosphere. This work applied the knowledge of air dispersion modelling to map out the atmospheric dispersion and resulting ground surface level concentration of gaseous amine, namely Monoethanolamine (MEA), from a coal-fired power plant (with a carbon capture unit) and in surrounding areas, in case of an accidental leaking of amine from the CCS system to the atmosphere. The chosen study area was centered on a coal-fired power plant in the province of Saskatchewan, Canada. The Environmental Protection (EPA) approved air pollution model (CALPUFF), together with meteorological and geophysical data were used for gaseous amine dispersion simulation. The results were presented, and the ground amine concentrations were found to vary with wind patterns (wind direction and wind speed). The maximum ground surface amine concentrations standard is 15.2 µg/m3. However, the results showed that when using the water wash unit, the MEA concentrations were well below the standard level, compared to those without the water wash unit. It is essential for CO2 capture plants located in highly populated areas to be equipped with water wash units.

Feasibility and mechanism of an amine-looping process for efficient CO2 mineralization using alkaline ashes

• Amines significantly improved the CO 2 sequestration capacity of ashes. • Amines enhanced Ca 2+ leaching from alkaline ashes. • The phytotoxicity of alkaline ashes were significantly reduced after carbonation. Amine-looping-based CO 2 mineralization is a promising technology for simultaneous CO 2 absorption, mineralization, and carbonate crystallization in a single step. This paper performed a detailed investigation of the feasibility and underlying mechanism of the amine-looping process using industrial alkaline solid wastes, including one Biomass ash (BA) and two coal-fired fly ashes named FA1 and FA2. The CO 2 sequestration capacity and CO 2 removal efficiency of selected ashes were investigated in five typical amine solutions, including monoethanolamine (MEA), diethanolamine (DEA), triethanolamine (TEA), 2-amino-2-methy-1-propanol (AMP), and piperazine (PZ). The physicochemical property of ashes before and after carbonation and the dissolution of alkaline minerals in various amine solutions were systematically determined to explore the underlying mechanism involved in the amine-looping process. Results show that greater improvement in CO 2 removal efficiencies and CO 2 sequestration capacities were obtained by selected ashes in amine solutions compared to the traditional CO 2 mineralization in the water-ash-CO 2 system. It also revealed that amines played important roles in promoting CO 2 mass transfer, enhancing Ca 2+ leaching, and producing small-sized CaCO 3 . The largest CO 2 sequestration capacity (102.9 g/kg) was achieved by FA1 in PZ solution which was suggested as the preferred solvent for the amine-looping process. In addition, the environmental risk of carbonated ashes for agricultural application in terms of amine loss and phytotoxicity was evaluated. Results implied that the phytotoxicity of carbonated BA could be neglected when a simple centrifugal wash was used to remove the absorbed amine on the surface of carbonated BA whilst the phytotoxicity of selected ashes can be significantly reduced after carbonation reactions.

Structural, morphological and optical characterization of chemically deposited Cu2O/PbS thin films

Cu2O/PbS core-shell thin films were synthesized by a chemical bath deposition technique using a reactive mixture containing copper nitrate, lead nitrate, ethylenediaminetetraacetic acid, tetraethyl amine and ammonia solution. Their structural and optical properties are reported in this work. For the elemental composition estimation, Rutherford backscattering spectroscopy (RBS) was performed. From the proton induced scan on the substrate containing the films, all the elements that make up the films were extracted as Cu (34.86%), Pb (1.69%), S (42.31%) and O (65.15%). This is an indication that Cu2O-PbS quaternary thin films were actually deposited on the substrate. The X-ray diffraction analysis showed the formation of multiple peaks indicating that the films possess polycrystalline structure. The scanning electron micrographs of the films depicted particles of different sizes scattered across the film surface. The absorbance, transmittance, absorption coefficient, band gap and extinction coefficient were modified by thermal annealing. Absorbance varies from 1.175 to 1.35 for as-grown, 1.475 to 1.50 for annealed at 150 oC and 1.65 to 2.00 for annealed at 200 oC. The percentage transmittance of 6.75 % was obtained for as-grown sample while those of the annealed samples are 6.0 % and 5.0 % at 150 oC and 200 oC respectively. Maximum absorption coefficient values are 3.48 x 106 m -1 , 3.68 x 106 m -1 and 4.60 x 106 m -1 for As-grown, annealed at 150 oC and 200 oC respectively. The band gap energy value is found to increase from 3.50 eV to 4.00 eV as a result of the increase in annealing temperature from 150 oC – 200 oC. Extinction coefficient values generally varies from 0.75 to 2.70 for as-grown, 0.80 to 2.85 for annealed at 150oC and 0.85 to 3.00 for annealed at 200oC. Based on the wide band gap exhibited by the films, it can be concluded that the films are suitable as window materials in the fabrication of solar cell devices.

A State‐of‐the‐Art Update on Integrated CO2 Capture and Electrochemical Conversion Systems

AbstractTo valorize waste CO2, capturing and utilizing it to produce chemical building blocks is currently receiving a lot of attention. In this respect, amine and alkali base solutions have shown to be efficient CO2 capturing solutions and electrochemical CO2 conversion is a promising technology to convert CO2 and, as such, reduce greenhouse gas emissions. However, to date, CO2 capture and utilization (CCU) technologies have been investigated almost exclusively as separate processes. This has the disadvantage that CO2 has to be desorbed and compressed from the capture solution before sending it to the CO2 electrolyzer, seriously increasing the capital and operational costs of the overall technology. To improve the valorization potential of the CCU technologies, integrating both technologies by directly utilizing the capture solution as an electrolyte for the electrochemical CO2 reduction (eCO2R) is a highly promising approach. This technology is however limited by low Faradaic efficiencies (FE) and partial current densities that can be achieved with these solutions. The main reason for this is the slow CO2 release rate at the catalytic interphase. Nevertheless, in recent years, in light of tackling these challenges, several studies successfully managed to decrease the costs of the CO2 capturing step and to electrochemically convert more efficiently the CO2 capture solutions. Herein, we review the status of the integrated CO2 capture and electrochemical conversion technology, discussing the recent developments and advances both in the field of CO2 capture and eCO2R.

Synthesis and Physicochemical Properties of CO2-switchable Gemini Surfactants

Conventional surfactants have excellent performance but not easily recycled and sustainable. The CO2/N2 switchable Gemini surfactants can be reused while maintaining performance and can also effectively utilize greenhouse gas CO2, thereby reducing carbon emissions. In our work, three tertiary amines N, N'-dimethyl N, N'-dialkyl ethylenediamine with different hydrophobic chain lengths (CnDEs, n = 12, 14, and 16) were fabricated by a two-step process using alkyl bromide, ethylenediamine, formic acid, and formaldehyde as raw materials. Structures of intermediates and end products were characterized by FTIR and 1H NMR. The Gemini surfactants such as N,N′-dimethyl N,N′-bis (dodecane, tetradecane, and hexadecane) alkylethylenediamine bicarbonates (CnDBs, n = 12, 14, and 16) were generated by the synthetic corresponding tertiary amines after bubbling CO2. After bubbling N2, the bicarbonate surfactants were converted into tertiary amine non-surfactants again. The reversibility of the switching of three surfactants was verified by measuring the changes in surface tension, zeta potential, particle size distribution, and foaming volume before and after CO2/N2 bubbled into the tertiary amine solutions. The physicochemical properties of CnDBs were studied by thermogravimetric analysis, surface tension measurement, cation content measurement, and dissipative particle dynamics (DPD). The results demonstrated that the synthesized CO2/N2 switchable Gemini surfactants had excellent reversibility and reproducibility. The application properties indicated that the Gemini surfactants could reduce interfacial tension of oil/water to ultra-low value; possessed good cation conversion rate and decent foaming properties. Furthermore, the surfactant performances were verified through DPD simulation experiments. With the industrialization of synthetic technology, the costs of CO2/N2 switchable Gemini surfactants will effectively decrease. Storage and utilization of considerable quantities carbon dioxide promote our green low-carbon life, which are conducive to the achievement of the national strategic goal of China's carbon peak in 2035 and carbon neutralization in 2050.