Methods Development for On-Line Gas Chromatography

Villalobos, Richard

doi:10.1093/chromsci/28.7.341

Cited by 8 publications

(3 citation statements)

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“…1, the total number of moles of the products are equal to those of the reactants, so the total molar flow of the system should be constant. However, the calculations from the external standard method indicated that the total molar flow at the inlet of the reactor (i.e., 5.69±0.10 mmol min - Selectivity Conversion Time on stream (min) 1 ) was lower than those estimated in the outlet stream of the reactor during the catalytic experiments. Namely, this method indicated that at the beginning of the reaction, the total molar flow was 6.34 mmol min -1 and decreased during the reaction to 5.98 mmol min -1 .…”

Section: Validation Of the Developed Methodsmentioning

confidence: 84%

A Method for the Highly Accurate Quantification of Gas Streams by On-Line Chromatography

Sandoval-Bohorquez¹,

Velasco-Rozo²,

Medrano

2020

Preprint

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This paper presents a method for the quantification of gas streams from reactive systems using on-line gas chromatography. The method is based on the mathematical development of correlations between the quantities detected by a set comprised of a thermal conductivity detector, a methanizer, and a flame ionization detector. The method allows for a complete and physically meaningful quantification of the composition of gas streams.<br>

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Section: Validation Of the Developed Methodsmentioning

confidence: 84%

A Method for the Highly Accurate Quantification of Gas Streams by On-Line Chromatography

Sandoval-Bohorquez¹,

Velasco-Rozo²,

Medrano

2020

Preprint

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“…We based our idea on two facts. (1) The stoichiometry factor between methane and CO2 or CO is 1.0; see Eq. 15-16.…”

Section: Assessment Of the Sensitivity And Response Factorsmentioning

confidence: 99%

A Method for the Highly Accurate Quantification of Gas Streams by On-Line Chromatography

Sandoval-Bohorquez¹,

Velasco-Rozo²,

Medrano³

2020

Preprint

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“…On-line chromatography is the most used technique to quantitatively characterize the gaseous streams from chemical reactors and certain unit operations. [1][2][3] By "on-line," it is implied that the gas chromatograph (GC) is connected to the outlet stream of the corresponding process unit. The gaseous samples must be introduced into the GC by intricate arrangements of valves.…”

Section: Introductionmentioning

confidence: 99%

A method for the highly accurate quantification of gas streams by on-line chromatography

Sandoval-Bohorquez

Rozo

Medrano

2020

Journal of Chromatography A

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Quantification of the gas streams from chemical systems such as catalytic reactors are routinely performed by on-line chromatography. Gas chromatographs used for this purpose are typically provided with a combination of thermal conductivity (TCD) and flame ionization (FID) detectors to be able to detect and quantify both permanent gases and hydrocarbons. However, the accuracy of the quantification is hindered by the intrinsic limitations of each type of detector. Namely, TCD has low sensitivity and FID does not detect permanent gases; COx, N2, H2, etc. Therefore, modern gas chromatographs include methanizer units to partially overcome this shortcoming by converting COx to methane. However, as far as these authors know, the literature has not presented an analytical method to characterize gas streams with high accuracy by the simultaneous use of a combination of a TCD-FID detection system provided with a methanizer. In this work, we developed analytical methods for this purpose. Our approach consisted on formulating a mathematical model for the well-known external and internal standard quantification methods in gas chromatography. We specifically applied the methodology to the analysis of the gas streams from a catalytic reactor performing the combustion of methane. We found that the commonly applied external standard method leads not only to inaccurate quantification but also to physically meaningless conclusions on the behavior of the selected model system. In contrast, the internal standard method led to a highly accurate quantification with a physical meaning. Considering these findings, our contribution also draws attention to the need for a thoughtful application of chromatographic methods when studying the reactivity of gas systems.

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Methods Development for On-Line Gas Chromatography

Cited by 8 publications

References 0 publications

A Method for the Highly Accurate Quantification of Gas Streams by On-Line Chromatography

A Method for the Highly Accurate Quantification of Gas Streams by On-Line Chromatography

A Method for the Highly Accurate Quantification of Gas Streams by On-Line Chromatography

A method for the highly accurate quantification of gas streams by on-line chromatography

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