Tetra-n-butylammonium Bromide Concentration Research Articles

Experiment design as a tool for hydrate phase equilibria prediction of CO2 + CH4 gas mixture in the presence of tera-butylammonium bromide in LW–H–V systems

In this study, we introduce experimental design as a novel approach to derive an equation that predicts the hydrate phase equilibrium temperature in a LW–H–V (liquid water, hydrate, vapor) system, based on pressure, gas composition, and the concentration of tetra-n-butylammonium bromide (TBAB). Our phase equilibria model is informed by experiments under nine different conditions, varying in gas compositions (CH4, CO2, and a 50/50 mole % CH4/CO2 mixture) and TBAB concentrations (15 and 30 wt.%). From these, we calculated temperature responses for 13 experiments, leading to the formulation of two models: a model without pressure transformation, which lacked predictive accuracy, and a more accurate model incorporating a natural logarithm pressure transformation (NLPT). The NLPT model demonstrated exceptional predictive power, with R2, adjusted R2, and predicted R2 values of 0.9975, 0.9958, and 0.9914, respectively. Additionally, it achieved an F-value of 565.90 in the analysis of variance (ANOVA). Validation diagrams, comparing predicted results to experimental data, confirmed the ability of the NLPT model to accurately predict hydrate phase equilibria, underscoring the efficacy of our experimental design approach.

Experimental investigation on the synergistic influence of tetra-n-butyl ammonium bromide(TBAB) and cyclopentane(CP) in hydrate-based gas separation

To enhance the CO2 separation efficiency of hydrate-based gas separation (HBGS) technology, the kinetic process of hydrate formation from synthesized CH4/CO2/N2 gas mixtures in the presence of cyclopentane (CP) and tetra-n-butyl ammonium bromide (TBAB) and gas separation efficiency were studied at an initial pressure of 7.0 MPa and temperatures ranging from 275.1 to 290.1 K. The crystallographic properties of the mixed hydrates were also evaluated by Raman, powder X-ray diffraction(XRD) and cryo-scanning electron microscop(cryo-SEM). Results showed that the combination of CP and TBAB tended to inhibit the separation efficiency compared with pure CP. The maximum CH4 recovery was 1.37 and the CO2 split ratio was 0.791 when using CP and TBAB solution. The order of CO2 split ratio in the different systems followed the order SDS > CP > TBAB/CP > CP/SDS > TBAB. Meanwhile, the adsorption capacity and gas consumption also decreased with an increase in TBAB concentration. Raman and XRD tests revealed that sI, sII, and semi-clathrate hydrates were found to coexist after hydrate formation and no other types of hydrates was formed. CH4 could only enter the small cages (512) of the hydrate. SEM images showed that the hydrate crystals were ellipsoid-shaped with different sizes and stacked together to form a globular structure, suggesting that the specific surface area of the hydrate crystals enhanced with the increasing of TBAB concentration. These findings can be used to evaluate the feasibility of applying TBAB and CP in HBGS technology.

Thermodynamic investigation of hydrate-based CO2 capture from simulated flue gas with new mixed promoters

Abstract CO2 hydrate-based desalination (CHBD) has been developing for decades to meet the global demands of decreasing carbon dioxide (CO2) emissions. In this work, the CO2 was captured from the simulated flue gas which consists of 18.30 mol% carbon dioxide and 81.70 mol% nitrogen in the presence of tetra-n-butyl ammonium bromide (TBAB) + cyclopentane (CP) + glucoamylase. Then the phase equilibrium data of CO2 hydrate were measured by the method of isochoric pressure-search. Among the seven cases with same concentration of TBAB (0.29 mol%) and CP (5.00 vol%) and different glucoamylase proportions (ranging from 0.00 to 20.00 wt%), the optimum concentration of glucoamylase in the mixed promoters was 3.00 wt%. The phase equilibrium data was calculated by the modified van der Waals–Platteeuw (vdW–P) model with a modification of vapor pressure of water in the empty hydrate lattice. The Peng–Robinson equation of state was used to calculate the fugacity of gas. The maximum average absolute deviation was 4.09% between the calculated results and the experimental results. It revealed that the calculated results were in good agreement with the experimental results.

Comparative Study of Tetra-N-Butyl Ammonium Bromide and Cyclopentane on the Methane Hydrate Formation and Dissociation

Two widely investigated methane hydrate promoters, tetra-n-butyl ammonium bromide (TBAB) and cyclopentane (CP), for methane hydrate formation and dissociation were comparatively investigated in the quiescent reactor at 2.5 °C and 8 MPa. The results indicated that the increase in the mass fraction TBAB decreased the induction time. However, it did not significantly affect the methane uptake. In the presence of CP, the increase in the CP concentration resulted in an increase in the induction time due to the increasing thicknesses of the CP layer in the unstirred reactor. Moreover, the methane uptake was varied proportionally with the CP concentration. The addition of TBAB resulted in a higher methane uptake than that of CP, since the presence of TBAB provided the cavities in the hydrate structure to accommodate the methane gas during the hydrate formation better than that of CP. On the contrary, the presence of CP significantly increased the induction time. Although the methane recovery remained relatively the same regardless of TBAB and CP concentrations, the recovery was higher in the presence of TBAB.

Effect of presence of tetra alkyl ammonium bromides on solution behavior of 1-Butyl-2, 3-dimethylimidazolium chloride at different temperatures: Volumetric and acoustic studies

Abstract Densities (ρ) and ultrasonic velocities (u) of 1-Butyl-2,3-dimethylimidazolium chloride, [bdmim]Cl, in aqueous solutions of tetra-n‑butyl ammonium bromide (TBAB) and tetra-n-propyl ammonium bromide (TPAB) have been measured at T = (298.15 to313.15)K. The apparent molar volume, Vϕand the apparent molar isentropic compressibility, Kϕ, s of the IL have been calculated. Both limiting apparent molar volume, V ϕ 0 and limiting apparent molar isentropic compressibility, K ϕ , S 0 were calculated using Redlich-Rosenfeld-Meyer (RRM) type equation and these values are compared with Masson type equation. The positive value of limiting apparent molar expansivity, E ϕ 0 indicates the ionic liquid (IL) has structure making effect. The increase in standard partial molar volume of transfer, Δ V ϕ 0 and standard partial molar isentropic compression of transfer, Δ K ϕ , S 0 of [bdmim]Cl with increasing TBAB concentrations has been explained by Friedman-Krishann co-sphere model. Moreover, some acoustic parameters were estimated using the experimental data at T= (298.15–313.15) K for justifying several interactions in the ternery solutions.

Carbon dioxide hydrate separation from Integrated Gasification Combined Cycle (IGCC) syngas by a novel hydrate heat-mass coupling method

A novel hydrate heat-mass coupling separation (HHMCS) method was studied to reduce the energy consumption of CO2 hydrate separation from Integrated Gasification Combined Cycle (IGCC) syngas in this work. Tetra-n-butyl ammonium bromide (TBAB) is used as a hydrate promoter and pure TBAB hydrate is used as a phase change heat-mass coupling additive. The heat-mass coupling effect, CO2 separation characteristics and influence factors were studied by continuous separation experiments in a bubble column reactor. Compared to conventional gas hydrate separation method, the HHMCS process exhibits a higher energy-saving potential, less temperature and TBAB concentration fluctuation due to pure TBAB hydrate phase change. Increase inlet gas rate, the accumulated gas consumption decreased slightly, but the average gas consumption rate increased. Increase operating pressure and decrease gas phase volume increased the average gas consumption rate and CO2 separation efficiency. After continuous separation of simulated syngas, the average CO2 concentration in H2-rich gas decreased to 17.45 mol%, and that in CO2-rich gas increased to 86.44 mol%. The CO2 split fraction and separation factor reached 0.80 and 8.15, respectively. The work provided a new idea to integrally utilize the phase change enthalpy, improve the operating flexibility and heat transfer in large device.

Application of tetra-n-butyl ammonium bromide semi-clathrate hydrate for CO2 capture from unconventional natural gases

In this study, tetra-n-butyl ammonium bromide (TBAB) semi-clathrate hydrate was employed for CO2 capture from unconventional natural gases exploited by supercritical CO2 injection. The TBAB hydrate formation kinetics and CO2 separation efficiency were studied under different TBAB concentrations and subcoolings using a stirred tank reactor. Optimum experimental conditions were obtained (2.8 MPa, ΔT = 6 K, 2.57 mol% TBAB), and the synergetic effect of sodium dodecyl sulfate (SDS) and TBAB on CO2 separation from CH4 + CO2 was investigated under these conditions. The results indicate that gas consumption and CO2 selectivity declined with the increase of subcooling, and the best CO2 selectivity was obtained at 2.57 mol% TBAB. The kinetics of TBAB hydrate nucleation and growth were promoted when adding SDS into the TBAB solution, but the CO2 separation efficiency was reduced. The CO2 selectivity obtained at 2.57 mol% TBAB was significantly improved as compared to the THF, THF/SDS, and TBPB systems. Therefore, TBAB is a prospective promoter for hydrate-based CO2 capture from CH4 + CO2. Continued efforts are required in the future to increase the gas consumption without sacrificing the CO2 separation efficiency.

Investigation of the kinetics of TBAB + carbon dioxide semiclathrate hydrate in presence of tween 80 as a cold storage material

Because of large cold storage capacity and suitable freezing temperature of hydrate slurries, these materials could be used as a medium to store the cold energy in air conditioning systems. Semiclathrate hydrates of tetra n-butylammonium bromide (TBAB) are favorable phase change materials (PCMs), due to their moderate hydrate formation conditions. The kinetics of carbon dioxide - TBAB semiclathrate hydrate formation in presence and absence of tween 80 as a non-anionic surfactant is investigated in this research. The experiments were performed in a 169 cm3 stirred batch reactor at initial pressure of 3.2 MPa and isothermal condition of 276.15 K. Aqueous solutions of TBAB with concentrations of 0–15 wt% in presence and absence of tween 80 with concentrations of 500 and 1500 ppm are tested. The results revealed that utilization of TBAB with concentrations of 5–15 wt%, inhibits the kinetics of formed hydrates. By increasing the concentration of TBAB the amount and rate of gas uptake and storage capacity (SC) of formed hydrates decreases. Tween 80 with a concentration of 500 ppm presented a slight positive effect on the kinetics of hydrate formation in presence and absence of TBAB. While 1500 ppm of this additive inhibited the kinetics of formed hydrates.

Solubility of argon and nitrogen in aqueous solutions of tetra- n -butylammonium bromide (TBAB) from 283.15 to 298.15 K and 101.325 kPa partial pressure of gas

Abstract This paper reports the solubility of argon and nitrogen in aqueous solutions of tetra-n-butylammonium bromide (TBAB) in a concentration interval ranging from 0.2 to 1.0 mol kg−1 and temperatures between 283.15 K and 298.15 K, at 101.325 kPa partial gas pressure. Measurements were done in saturation equipment which measures the pressure decrease of the gas. The value for solubility at 101.325 kPa partial pressure was calculated using Henry’s law. It was found that the solubility of argon and nitrogen increases as the concentration of TBAB becomes larger. The results show that the solubilisation mechanism is not mediated by micelle formation. Standard thermodynamic functions for the dissolution process of argon and nitrogen in aqueous solutions of TBAB were calculated from solubility data. The effect of salt is described using a modified Sechenov equation.

Carbon dioxide and sulfur dioxide capture from flue gas by gas hydrate based process

The CO2 and SO2 capture from the simulated flue gas simultaneously by gas hydrate process were experimentally studied using tetra-n-butyl ammonium bromide (TBAB) as the hydrate formation promoter in this work. The effects of initial pressure, SO2 enrichment, the ratio of gas and liquid and TBAB concentration on CO2 and SO2 capture have also been studied. The results indicate that about 95% of SO2 in flue gas can be removed by gas hydrate capture process, but the vast majority of SO2 are captured by dissolution, and gas hydrate formation has very little effect on SO2 removal. SO2 enrichment in solution increases SO2 concentration in residual gas. The intial pressure, TBAB concentration and the ratio of gas and liquid volume has very small effect on SO2 capture, but have some effects on CO2 capture. Both the dissolution and hydrate formation have a role on CO2 capture. The CO2 concentration in residual gas reduces to about 8 mol% after the hydrate capture, and the S.Fr.CO2 reaches above 60%, and the S.F.CO2 reaches around 8.

Solubility of Nitrogen Gas in Aqueous Solution of Tetra-n-Butylammonium Bromide

Semiclathrate hydrates are water-based host-guest compounds formed from aqueous solutions of ionic guest substances. These materials can greatly moderate formation pressures and temperatures from canonical gas hydrates. This is a significant advantage for industrial applications such as gas separation and storage. $$\hbox {N}_{2}$$ gas is a major component contained in various flue gases and is usually mixed with $$\hbox {CO}_{2}$$ . Semiclathrate hydrates can separate these gases under moderate thermodynamic conditions. Tetra-n-butylammonium bromide (TBAB) is a widely used ionic guest substance. To develop the application technologies and their theoretical models, solubility data of $$\hbox {N}_{2}$$ gas in TBAB aqueous solutions are required. In this study, we report $$\hbox {N}_{2}$$ gas solubility measured by an absolute gravimetric method for the semiclathrate hydrate formation system of $$\hbox {TBAB} + \hbox {H}_{2}\hbox {O} + \hbox {N}_{2}$$ . The measurement pressures, temperatures and TBAB mass fractions were 3 MPa, 5 MPa and 7 MPa, 292.15 K, 302.15 K and 307.15 K, and 0 (pure water), 0.10, 0.20, 0.32 and 0.40, respectively. The uncertainties were 0.056 MPa, 0.44 K and 0.00012 in mole fraction. Although the technical difficulty lays on measurements of small $$\hbox {N}_{2}$$ gas solubility by the absolute gravimetric method, our data implied the unique gas dissolution property of aqueous TBAB solution depending on the TBAB concentration. The aqueous TBAB solutions with mass fractions of 0.10 and 0.20 had similar $$\hbox {N}_{2}$$ gas solubility as that in pure water. With higher mass fractions, 0.32 and 0.40, the $$\hbox {N}_{2}$$ gas solubility slightly increased from that in pure water, which implies the salting-in effect of TBAB.

Kinetic study of hydrate formation for argon + TBAB + SDS aqueous solution system

In this communication, the effects of initial temperature and pressure, aqueous TBAB (tetra-n-butylammonium bromide) solution concentration, and sodium dodecyl benzene sulfonate (SDS) concentration on the kinetic behaviour of semi-clathrate hydrates of Ar+aqueous TBAB solutions were investigated. Kinetic experiments were performed in a high pressure equilibrium cell with an inner volume of approximately 40cm3 at initial temperatures of (281, 285 and 287.5)K and initial pressures of (6.1, 8.1 and 10.1)MPa. The results indicate that induction time decreases significantly with an increase in the initial pressure. However, the kinetic constant, and consumption of Ar during the semi-clathrate hydrate formation, increases. The same trends were detected with a decrease in the initial temperature, at a constant pressure. In addition, with an increase in the TBAB concentration, from 0.1 to 0.3mass fraction TBAB, the rate of semi-clathrate hydrate nucleation and consumption of Ar, increases during the hydrate formation, while the induction time decreases, significantly. The results therefore show a positive kinetic effect of TBAB on Ar hydrates which indicates that TBAB is a reliable promoter to increase the rate of argon hydrate formation. The results for the addition of SDS (at concentrations of 100, 200ppm) at initial temperatures of 285K and initial pressures of (6.1 and 8.1)MPa indicate that SDS increases the induction time of the semi-clathrate hydrate formation for the system of Ar+0.1mass fraction TBAB+0.9mass fraction water, but there is no systematic trend between induction times and the SDS concentrations for this system.

Semiclathrate-based CO2 capture from fuel gas in the presence of tetra-n-butyl ammonium bromide and silica gel pore structure

Pre-combustion CO2 capture technology was investigated via a hydrate-based gas separation process. Semiclathrate phase equilibria were measured for the simulated fuel gas from the integrated gasification combined cycle (IGCC) consisting of 40mol% CO2 and balanced H2 in the presence of tetra-n-butyl ammonium bromide (TBAB) and porous silica gel particles containing water inside. The basic idea is an extension of our previous work [34], that is, using a porous silica gel structure made it possible to get rid of stirring the content inside the hydrate reactor and ensure the rapid hydrate formation with relatively short induction. TBAB was introduced to confined aqueous solution in silica gel pore structure, having nominal pore diameter of 100nm, as a thermodynamic promoter and formed semiclathrate with the gas mixture under milder temperature and pressure conditions. Compositional analysis of semiclathrate and coexisting gas phases was also performed at various temperatures and TBAB concentrations. The highest CO2 concentration obtained from the dissociated semiclathrate was 94mol% formed at 277.15K and 3.0MPa, with 20wt% TBAB solution in 100nm silica gel. To demonstrate the highly-concentrated CO2 outlet stream from the single-stage semiclathrate reactor, the kinetic study of CO2 distribution through fixed-bed type reactor charged with silica gel particles containing aqueous TBAB solution was also investigated. Utilization of porous silica gel makes it possible to capture higher concentration of CO2 in the semiclathrate phase, but it also reduced the total amount of gas consumed for semiclathrate conversion. However, the use of silica gel particles with TBAB enabled formation of semiclathrate hydrate under milder conditions and unstirred continuous method to a high extent and a high rate.

Gas separation of flue gas by tetra-n-butylammonium bromide hydrates under moderate pressure conditions

Ionic clathrate hydrates are composed of water and ionic guest substance, which can selectively capture gas under moderate conditions. We performed gas separation experiments with tetra-n-butylammonium bromide (TBAB) widely-used for an ionic guest substance. The experiments in a closed system showed good CO2 gas selectivity of the TBAB hydrates even under the mild conditions: 1 MPa and 282 K. We also performed the gas separation with tetrahydrofuran (THF) which is a guest substance forming the structure II clathrate hydrate. Comparison with THF clearly revealed the better CO2 selectivity of TBAB than that of the structure II clathrate hydrate. We further compared our data with the literature, and found that the condition of low pressure and dense TBAB concentration provided superior CO2 selectivity. Gas separation with continuous gas flow was demonstrated. The hydrate formation behavior was similar to the cases without gas flow. The results showed that controlling the crystal growth temperature is important to capture gases by the TBAB hydrates.

Phase Equilibrium Data for Semiclathrate Hydrate of Synthesized Binary CO2/CH4 Gas Mixture in Tetra-n-butylammonium Bromide Aqueous Solution

Hydrate-based gas separation(HBGS) technology based on tetra-n-butyl ammonium bromide (TBAB) semiclathrare hydrate can be utilized in CO2 separation from biogas. The phase equilibria of semiclathrate hydrates are crucial for the successful industrial application of HBGS technology. In this work, the phase equilibrium data of TBAB semiclathrate hydrate with a synthesized binary CO2/CH4 mixed gas (0.5 CO2 and 0.5 CH4 in mole fraction) were reported at five different TBAB concentrations (0.001, 0.01, 0.05, 0.1, and 0.2 mass fraction). The experiments were conducted in the temperature range (278.1 to 292.6) K and pressure range (2.17 to 8.16) MPa using an isochoric method. The agreement between the experimental data and the data reported in the literature indicated the reliability of the apparatus and method. The results showed that there were no obvious thermodynamic promotion effects on the CO2/CH4 mixed gas hydrate phase equilibrium conditions when the mass fraction of TBAB was less than 0.01, while there ...

Unexpected inhibition of CO2 gas hydrate formation in dilute TBAB solutions and the critical role of interfacial water structure

Gas hydrates formed under moderated conditions open up novel approaches to tackling issues related to energy supply, gas separation, and CO2 sequestration. Several additives such as tetra-n-butylammonium bromide (TBAB) have been empirically developed and used to promote gas hydrate formation. Here we report unexpected experimental results which show that TBAB inhibits CO2 gas hydrate formation when used at minuscule concentration. We also used spectroscopic techniques and molecular dynamics simulation to gain further insights and explain the experimental results. They have revealed the critical role of water alignment at the gas-water interface induced by surface adsorption of tetra-n-butylammonium cation (TBA+) which gives rise to the unexpected inhibition of dilute TBAB solution. The water perturbation by TBA+ in the bulk is attributed to the promotion effect of high TBAB concentration on gas hydrate formation. We explain our finding using the concept of activation energy of gas hydrate formation. Our results provide a step toward to mastering the control of gas hydrate formation.

Study of tetra-n-butylammonium bromide and tetrahydrofuran hydrate formation kinetics as a cold storage material for air conditioning system

In order to utilize hydrate slurry for cold storage in air-conditioning system, the experimental studies on the phase behavior and formation kinetics of tetra-n-butylammonium bromide (TBAB) semiclathrate hydrate, tetrahydrofuran (THF) hydrate and TBAB–THF mixture hydrate have been carried out. By changing the concentrations of TBAB (5–55wt.%), the variations of phase change temperature, equilibrium temperature, sub-cooling driving force, nucleation rate and electrical conductivity measurements have been compared. The results have revealed that the TBAB solution with 40–45wt.% may be a promising cold storage material for air conditioning system because of higher temperature phase change of about 11.2°C and maximum amount of hydrate formed of about 99.8%. In the case of TBAB and THF mixture, which prepared at 0–5.37 mass ratios, the phase change temperature and kinetic parameters depend on the amounts of THF and TBAB into the solution. At the mass ratios higher than 1.0, the above mentioned parameters increase, so that the increase in the TBAB concentration helps to increase the phase change temperature and kinetic parameters.

Experimental measurement and thermodynamic modelling of phase equilibria of semi-clathrate hydrates of (CO2 + tetra-n-butyl-ammonium bromide) aqueous solution

Comprehensive studies on semi-clathrate hydrates phase equilibria are still required to better understand characteristics of this type of clathrates. In this communication, new experimental data on the dissociation conditions of semi-clathrate hydrates of {carbon dioxide+tetra-n-butyl-ammonium bromide (TBAB)} aqueous solution are first reported in a wide range of TBAB concentrations and at different pressures and temperatures. A thermodynamic model is then proposed to predict the dissociation conditions of the semi-clathrate hydrates for the latter system. The (hydrate+TBAB) aqueous solution (H+Lw) phase equilibrium prediction is considered based on Gibbs free energy minimization approach. A modified van der Waals–Platteeuw solid solution theory developed based on the (H+Lw) equilibrium information is employed to predict the dissociation conditions of semi-clathrate hydrates of carbon dioxide+TBAB. The properties of the aqueous solution are estimated using the AMSA-NRTL electrolyte model (considering the association and hydration of ions). The Peng–Robinson equation of state is used for estimating the gas/vapour phase properties. Results show that the proposed model satisfactorily predicts the experimental values with an average absolute relative deviation of approximately 13%.

Phase equilibrium modeling of semi-clathrate hydrates of seven commonly gases in the presence of TBAB ionic liquid promoter based on a low parameter connectionist technique

Several studies show that thermodynamic ionic liquid promoter, such as Tetra-n-butylammonium bromide (TBAB) can moderate the formation conditions of gas hydrates. In the current study, a Support Vector Machine (SVM) and coupling of SVM with Genetic Algorithm (GASVM) have been developed to predict semi-clathrate hydrate pressure of CO2, CH4, N2, H2, Ar, Xe and H2S in the presence of TBAB ionic liquid according to the critical temperature (Tc), critical pressure (Pc) and acentric factor (ω) of abovementioned gases over wide ranges of temperature, pressure and concentration of TBAB. For implementation of networks, 528 experimental data points collected from the published papers have been employed. Moreover, to verify both proposed models, regression analysis and statistical analysis such as mean square errors (MSEs), average relative deviations (ARDs), standard deviations (STDs) and root mean square errors (RMSEs) have been conducted on the experimental and predicted values of semi-clathrate hydrate pressure of gases in TBAB. While, the values of R2=0.97759 and ARD=0.25465132obtained for SVM model, coefficient of determination (R2) and Average Relative Deviation (ARD) of GASVM between the experimental and predicted values are 0.99944 and 0.07180737 respectively. Finally, according to the obtained results, in this contribution, ability and better performance of using GASVM as a correlation for prediction of semi-clathrate hydrate pressure and temperature in TBAB has been shown against SVM model.

Experimental Measurement and Thermodynamic Modeling of Hydrate Dissociation Conditions for the Argon + TBAB + Water System

Gas hydrate (clathrate hydrate) dissociation data at low to moderate pressures are necessary for practical applications, e.g., for gas separation. However, it is often known or recognized that the separation conditions encountered exist at high pressures and low temperatures. One solution to this problem is the application of the quaternary ammonium salts (QAS) semiclathrate hydrates such as tetra-n-butyl ammonium bromide (TBAB) which can moderate the hydrate dissociation conditions. The addition of TBAB to the solution enables a shift in the pressure-temperature diagrams to lower pressures and higher temperatures. In this study, the isochoric pressure search method1,4,13,28,34−37 was used to measure hydrate dissociation conditions for the argon + TBAB + water system. The measurement of hydrate dissociation conditions were performed at various TBAB concentrations, namely, (0, 0.05, 0.10, 0.20, and 0.30) mass fraction. The experiments were performed in the temperature range of (274 to 293.6) K and pressures ranging from (0.34 to 12.32) MPa. Results indicate that TBAB has a significant promotion effect on argon hydrate formation. In addition, increasing the TBAB concentration increases its promotion effect. A thermodynamic model was developed to predict the hydrate dissociation conditions for the system of argon + TBAB + water. The results show good agreement between the experimental measurements and model results.