Purification of Natural Gas with High CO2 Content by Formation of Gas Hydrates: Thermodynamic Verification

Azmi, Nurulhuda; Mukhtar, Hilmi; Sabil, Khalik M.

doi:10.3923/jas.2011.3547.3554

Cited by 6 publications

(5 citation statements)

References 29 publications

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“…This is due to the occupancy of CH 4 and CO 2 gas molecules in the larger cavities of hydrate structure. The other heavy carbon elements in composition like C 3 H 8 and C 4 H 10, which are larger in molecular structure, will act as gas diluents and do not participate in the hydrate formation 36 . For the validation of the simulation, experimental data is considered and compared to that of the CSMGEM data.…”

Section: Discussion and Resultsmentioning

confidence: 99%

Phase behavior study on gas hydrates formation in gas dominant multiphase pipelines with crude oil and high CO2 mixed gas

Sayani

Pedapati

Lal

2020

Sci Rep

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This research is focused on understanding the phase behavior of gas hydrate formation in the gas dominant multiphase pipelines containing mixed gas with high CO2, crude oil, and deionized water. The experimental conditions are in the pressure range of 3–7 MPa with water cut as 20% of the volume. Initially, the effect of high CO2 content in natural gas on the phase boundary conditions of hydrates is studied through simulation (CSMGEM software) and experiments. Later, an additional phase of crude oil was introduced, with 15% of the volume to study the multiphase system. From the experimental analysis, thermodynamic equilibrium conditions were found, and the hydrate-liquid–vapor-equilibrium (HLVE) curves were drawn. The phase behavior is comprehended by comparing the HLVE curves of pure and multiphase systems. It is found that the high CO2 content tends to promote the gas hydrate formation. Based on the results, temperature variance and enthalpy of formation were calculated for the multiphase system. With a difference of 1.32 average temperature variance, the multiphase system exhibits inhibition. A basic statistical regression model was made to predict the gas hydrate formation in multiphase transmission pipelines. This work helps in understanding the effect of a new phase on gas hydrate formation.

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Section: Discussion and Resultsmentioning

confidence: 99%

Phase behavior study on gas hydrates formation in gas dominant multiphase pipelines with crude oil and high CO2 mixed gas

Sayani

Pedapati

Lal

2020

Sci Rep

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“…There are variety of different processes and technologies for CO 2 capture from industrial and natural gas streams. Adsorption‐based methods , cryogenic fractionation based CO 2 recovery , hydrate‐based systems , permeation processes , and absorption with solvents are the main approaches. In some studies, hybrid systems are proposed for CO 2 removal .…”

Section: Introductionmentioning

confidence: 99%

Decision tree‐based modeling of CO₂ equilibrium absorption in different aqueous solutions of absorbents

Yarveicy

Saghafi²,

Ghiasi

et al. 2019

Env Prog and Sustain Energy

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In absorption‐based CO2 removal processes, one of the most important parameters that must be determined is the equilibrium solubility of CO2 in solvents. This study is the first time to employ the extremely randomized trees, Extra Trees, methodology to develop an Extra Trees model for the CO2 loading capacity of various absorbents. The ability of the proposed decision tree‐based model in estimation of CO2 solubility values was compared to that of the previously presented models on the basis of the adaptive neuro‐fuzzy inference system (ANFIS), least squares version of the support vector machine (LSSVM), and artificial neural network (ANN), using error analysis. According to the obtained results, the presented Extra Trees model is able to estimate the CO2 loading capacity of solvents with an absolute relative deviation in percent (AARD%) equal to 0.15. The calculated values of AARD% for the literature models, i.e., LSSVM, radial basis function‐artificial neural network (RBF‐ANN), multilayer perceptron‐ANN (MLP‐ANN), and ANFIS, are 2.00, 10.03, 6.18, and 14.15, respectively. Hence, the developed Extra Trees model provides much higher robustness and accuracy in estimating/representing the solubility of CO2 in different aqueous solutions of solvents. © 2019 American Institute of Chemical Engineers Environ Prog, 38: S441–S448, 2019

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“…CO2 capturing from natural gas is seen as an option of utilizing these undeveloped resources. However, there are challenges associated with this technique such as high cost, advanced technology and processes corrosion and high energy demand [8,9]. This study therefore was focused on increasing the CO2 minimum requirement in the Malaysian natural gas composition from 0.57% to 40% as a way of simulating the natural gas field's composition and at the same time study the effect of high CO2 content-natural gas on engine performance.…”

Section: Introductionmentioning

confidence: 99%

The Effect of High Carbon Dioxide Content on the Performance and Emission Characteristics of a Direct Injection (DI) Compressed Natural Gas Engine

Ayandotun

Aziz

Heikal

2014

AMM

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Abstract. This paper investigates the potential of utilizing the undeveloped natural gas fields in Malaysia with high carbon dioxide (CO2) content ranging from 28 to 87%. For this experiment, various CO2 proportions by volume were added to pure natural gas as a way of simulating raw natural gas compositions in these fields. The experimental tests were carried out using a 4-stroke single cylinder spark ignition (SI) direct injection (DI) compressed natural gas (CNG) engine. The tests were carried out at 180 o CA BTDC injection timing and 3000 rpm, to establish the effects on the engine performance. The findings revealed that the brake torque decreased by 9% with 20% CO2 proportion in the mixture due to the decrease in the heating value of the mixture. At the same proportion of CO2, the brake specific fuel consumption decreased by about 8.5% and the brake thermal efficiency increased by 9.2%. There was a reduction in the unburnt hydrocarbons (THC) and carbon monoxide (CO) emissions by 15% and 89% respectively, but the NOx emissions increased by 78%. The utilization of natural gas with 20% CO2 content as fuel in DI-CNG engine was found to be viable with insignificant drop in engine performance and with reductions in exhaust emissions. IntroductionThe search for alternative fuels for internal combustion engines with a view to improving the engine fuel economy and reducing harmful exhaust emissions becomes necessary [1] as the energy needs in the transportation sector is growing drastically due to the increase in the number of vehicles. However, fossil fuels, specifically crude oil, being the major sources of energy and fuel for transportation, power generation and other applications are depleting at alarming rates, leading to increases in their prices. Also the increasing consumption of these fuels is causing environmental pollution thereby causing global warming and health related problems. Therefore, dependency on fossil fuels (gasoline and diesel) calls for alternative energy sources for future energy needs. Moreover, with the increasing stringent emission standards continually legislated, alternative fuels are currently being used [2,3] to tackle the negative resultant effects of environmental pollution such as unburned hydrocarbon (uHC), carbon monoxide (CO) and nitrogen oxide (NOx) among others generated by all sectors.In lieu of this, extensive research studies have been carried out to determine alternative fuels that are best suited for both spark ignition (SI) and compression ignition engines; and other applications. For spark ignition engines, biogas and syngas [4,5] have been studied and proved to enhance performance and reduce emissions under appropriate operating condition while for compression ignition engines, seed-oil bio fuels [5,6] have been examined and found to give similar performance and emissions when compared with conventional diesel fuels, particularly when blended with diesel fuel or emulsified with ethanol or water.Natural gas is amongst the fast growing component of the world's primary ...

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Purification of Natural Gas with High CO2 Content by Formation of Gas Hydrates: Thermodynamic Verification

Cited by 6 publications

References 29 publications

Phase behavior study on gas hydrates formation in gas dominant multiphase pipelines with crude oil and high CO2 mixed gas

Phase behavior study on gas hydrates formation in gas dominant multiphase pipelines with crude oil and high CO2 mixed gas

Decision tree‐based modeling of CO₂ equilibrium absorption in different aqueous solutions of absorbents

The Effect of High Carbon Dioxide Content on the Performance and Emission Characteristics of a Direct Injection (DI) Compressed Natural Gas Engine

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Purification of Natural Gas with High CO2 Content by Formation of Gas Hydrates: Thermodynamic Verification

Cited by 6 publications

References 29 publications

Phase behavior study on gas hydrates formation in gas dominant multiphase pipelines with crude oil and high CO2 mixed gas

Phase behavior study on gas hydrates formation in gas dominant multiphase pipelines with crude oil and high CO2 mixed gas

Decision tree‐based modeling of CO2 equilibrium absorption in different aqueous solutions of absorbents

The Effect of High Carbon Dioxide Content on the Performance and Emission Characteristics of a Direct Injection (DI) Compressed Natural Gas Engine

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About

Decision tree‐based modeling of CO₂ equilibrium absorption in different aqueous solutions of absorbents