Adsorption of Natural Gas Mixtures of Methane, Ethane, and Propane in Nanoporous Carbon: Fully Atomistic Numerical Studies

The feasibility of using Raman spectrometry for determining the composition of mixtures of natural gas components was examined. Raman intensity measurements were carried out on eight, gravimetrically prepared, binary gas mixtures containing methane, nitrogen, and isobutane at ambient temperature and at pressures to 0.8 MPa. The repeatability of the molar intensity ratio, ( I2/ y2)/( I1/ y1), where y1 is the concentration of component 1 in the mixture, and I1 is the intensity of the related line in the mixture spectrum, was examined. The compositions of two gravimetrically prepared methane-nitrogen-isobutane gas mixtures were determined spectrometrically with an estimated precision of about 0.001 in the mole fraction. Typical differences from the gravimetric concentrations were less than 0.002 in the mole fraction. The Raman spectrum of a gravimetrically prepared, eight component, hydrocarbon gas mixture was obtained to show that the Raman spectrometric method has potential for being applicable to natural gas type mixtures.

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Modeling of nitrogen separation from natural gas through nanoporous carbon membranes

Journal of Natural Gas Science and Engineering ◽

10.1016/j.jngse.2015.08.040 ◽

2015 ◽

Vol 26 ◽

pp. 1278-1284 ◽

Cited By ~ 7

Author(s):

Abdulrahman A. Al-Rabiah ◽

Abdelhamid M. Ajbar ◽

Moustafa A. Soliman ◽

Fahad A. Almalki ◽

Omar Y. Abdelaziz

Keyword(s):

Natural Gas ◽

Nanoporous Carbon ◽

Carbon Membranes

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Thermophysical Properties of Natural Gas Mixtures Derived from Acoustic Cavity Measurements

ACS Symposium Series - Supercritical Fluid Engineering Science ◽

10.1021/bk-1992-0514.ch010 ◽

1992 ◽

pp. 121-132

Author(s):

S. O. Colgate ◽

A. Sivaraman

Keyword(s):

Natural Gas ◽

Thermophysical Properties ◽

Gas Mixtures ◽

Acoustic Cavity

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Capturing the Effects of NOX and SOX Impurities on Oxy-Combustion Under Supercritical CO2 Conditions for Coal-Derived Syngas and Natural Gas Mixtures

10.1115/1.0002639v ◽

2021 ◽

Author(s):

Ramees K Rahman ◽

K R v (Raghu) Manikantachari ◽

Samuel Barak ◽

Erik Ninnemann ◽

Ashvin Hosangadi ◽

...

Keyword(s):

Natural Gas ◽

Supercritical Co2 ◽

Gas Mixtures

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Ignition Studies of C1-C7 Natural Gas Blends At Gas-Turbine Relevant Conditions

Journal of Engineering for Gas Turbines and Power ◽

10.1115/1.4050063 ◽

2021 ◽

Author(s):

Amrit Sahu ◽

A.A.E.S Mohamed ◽

Snehashish Panigrahy ◽

Gilles Bourque ◽

Henry Curran

Keyword(s):

Natural Gas ◽

Gas Turbine ◽

Gas Mixtures ◽

Rapid Compression Machine ◽

Temperature Range ◽

Auto Ignition ◽

Wide Range ◽

Model Predictions ◽

Detailed Kinetic Model ◽

Sensitization Effect

Abstract New ignition delay time measurements (IDT) of natural gas mixtures enriched with small amounts of n-hexane and n-heptane were performed in a rapid compression machine to interpret the sensitization effect of heavier hydrocarbons on auto-ignition at gas-turbine relevant conditions. The experimental data of natural gas mixtures containing alkanes from methane to n-heptane were carried out over a wide range of temperatures (840-1050 K), pressures (20-30 bar), and equivalence ratios (f = 0.5 and 1.5). The experiments were complemented with numerical simulations using a detailed kinetic model developed to investigate the effect of n-hexane and n-heptane additions. Model predictions show that the addition of even small amounts (1-2%) of n-hexane and n-heptane can lead to an increase in reactivity by ~40-60 ms at a temperature of 700 K. The IDTs of these mixtures decrease rapidly with an increase in the concentration of up to 7.5% but becomes almost independent of the C6/C7 concentration >10%. This sensitization effect of C6 and C7 is also found to be more pronounced in the temperature range 700-900 K compared to that at higher temperatures (>900 K). The reason is attributed to the dependence of IDT primarily on H2O2(+M)??H+?H (+M) at higher temperatures while the fuel-dependent reactions such as H-atom abstraction, RO2 dissociation, or Q OOH+O2 reactions are less important compared to the temperature range 700-900 K, where they are very important.

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Ignition Studies of C1–C7 Natural Gas Blends at Gas-Turbine Relevant Conditions

Volume 4B: Combustion, Fuels, and Emissions ◽

10.1115/gt2020-15826 ◽

2020 ◽

Author(s):

Amrit Bikram Sahu ◽

A. Abd El-Sabor Mohamed ◽

Snehasish Panigrahy ◽

Gilles Bourque ◽

Henry Curran

Keyword(s):

Natural Gas ◽

Gas Turbine ◽

Ignition Delay ◽

Delay Time ◽

Ignition Delay Time ◽

Gas Mixtures ◽

Auto Ignition ◽

Wide Range ◽

Detailed Kinetic Model ◽

Sensitization Effect

Abstract New ignition delay time measurements of natural gas mixtures enriched with small amounts of n-hexane and n-heptane were performed in a rapid compression machine to interpret the sensitization effect of heavier hydrocarbons on auto-ignition at gas-turbine relevant conditions. The experimental data of natural gas mixtures containing alkanes from methane to n-heptane were carried out over a wide range of temperatures (840–1050 K), pressures (20–30 bar), and equivalence ratios (φ = 0.5 and 1.5). The experiments were complimented with numerical simulations using a detailed kinetic model developed to investigate the effect of n-hexane and n-heptane additions. Model predictions show that the addition of even small amounts (1–2%) of n-hexane and n-heptane can lead to increase in reactivity by ∼40–60 ms at compressed temperature (TC) = 700 K. The ignition delay time (IDT) of these mixtures decrease rapidly with an increase in concentration of up to 7.5% but becomes almost independent of the C6/C7 concentration beyond 10%. This sensitization effect of C6 and C7 is also found to be more pronounced in the temperature range 700–900 K compared to that at higher temperatures (> 900 K). The reason is attributed to the dependence of IDT primarily on H2O2(+M) ↔ 2ȮH(+M) at higher temperatures while the fuel dependent reactions such as H-atom abstraction, RȮ2 dissociation or Q.OOH + O2 reactions are less important compared to 700–900 K, where they are very important.

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An improved method for calculating critical temperatures and critical pressures in natural gas mixtures with up to nC11 hydrocarbons

Oil & Gas Science and Technology – Revue d’IFP Energies nouvelles ◽

10.2516/ogst/2019027 ◽

2019 ◽

Vol 74 ◽

pp. 53

Author(s):

Marvin Ricaurte ◽

José M. Fernández ◽

Alfredo Viloria

Keyword(s):

Natural Gas ◽

Empirical Model ◽

Gas Mixtures ◽

Gas Condensate ◽

Critical Properties ◽

Improved Method ◽

Critical Temperatures

This study suggests an improvement to the empirical model proposed by Peng (1986, Can. J. Chem. Eng. 64, 827–830) to calculate critical temperatures and critical pressures in natural gas mixtures. It aims to extend its application to natural gas mixtures containing hydrocarbons compounds up to undecane (nC11). This work focuses on establishing new matrices of coefficients Aij by obtaining new binary interactions between heavy compounds and the rest of compounds present in natural gas mixtures. The analysis considered more than 300 natural gas mixtures. Different comparisons were made between calculated critical properties, and referenced critical properties. Mean absolute errors <1.00% for the critical temperatures, and <2.70% for critical pressures were obtained. These low average deviations demonstrate the accuracy of this study, and could be considered as an easy-to-use engineering tool for estimating critical properties in natural gas mixtures, applicable to lean gas, rich gas, gas condensate, and Natural Gas Liquids (NGL).

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