Automated analysis of the gas mixture from ethylene epoxidation by oxygen and nitrous oxide mixtures using gas chromatography

1988 ◽  
Vol 450 (3) ◽  
pp. 399-402 ◽  
Author(s):  
You-Sing Yong ◽  
K.Jacob Soerensen ◽  
Noel W. Cant
Keyword(s):  
Gas Chromatography ◽  
Nitrous Oxide ◽  
Automated Analysis ◽  
Gas Mixture ◽  
Ethylene Epoxidation

DlCO measurements with gas chromatography

1962 ◽  
Vol 17 (6) ◽  
pp. 856-860 ◽  
Author(s):  
Josef R. Smith ◽  
Lyle H. Hamilton
Keyword(s):  
Gas Chromatography ◽  
Normal Subjects ◽  
Inert Gas ◽  
Breath Holding ◽  
Gas Mixture ◽  
Diffusing Capacity ◽  
Gas Chromatograph ◽  
Excellent Correlation ◽  
Pulmonary Diffusing Capacity ◽  
The Mean

A gas chromatograph has been used to analyze gases for the measurement of pulmonary diffusing capacity using the breath-holding technique. The gas mixture used for the measurement consisted of carbon monoxide in air with neon as the insoluble inert gas. The calculated DlCO was unaffected when sulphur hexafloride (SF6) or He was substituted for Ne in the mixture, but since CO and Ne could be most simply and rapidly analyzed, this combination was preferred for the gas mixture used to measure DlCO. The mean DlCO for ten normal subjects was 25.8 ± 4.2 ml/min mm Hg. These results were comparable to values reported in the literature when established methods of analysis were used. An excellent correlation was found between calculated DlCO and the clinical condition of patients with impaired pulmonary diffusing capacity. Submitted on February 14, 1962

THE ACTION OF PYRIDINE ON D-MANNITOL HEXANITRATE

1955 ◽  
Vol 33 (12) ◽  
pp. 1735-1745 ◽  
Author(s):  
J. R. Brown ◽  
L. D. Hayward
Keyword(s):  
Nitric Oxide ◽  
Nitrous Oxide ◽  
Material Balance ◽  
Ring Cleavage ◽  
Gas Mixture

From a 0.368 M solution of D-mannitol hexanitrate in pyridine at 30 ± 5 °C. a gas consisting of nitric oxide, nitrous oxide, and nitrogen was evolved and D-mannitol-1,2,4,5,6-pentanitrate and pyridinium nitrate were recovered after dilution with water. The amount and composition of the gas mixture were sensitive to traces of moisture in the pyridine. Establishment of a material balance for the reaction indicated that approximately two moles of pyridine suffered ring cleavage while 0.25 mole of hexanitrate was completely denitrated and 0.75 mole of pentanitrate was formed. Some features of the mechanism of the denitration reaction are discussed.

scholarly journals Relationship between Stationary and Mobile Phase Composition and its Influence on the Retention Time of Some Analytes in Gas Chromatography

2000 ◽  
Vol 18 (4) ◽  
pp. 323-331
Author(s):  
R. Nasuto
Keyword(s):  
Gas Chromatography ◽  
Mobile Phase ◽  
Hydrogen Gas ◽  
Gas Mixture ◽  
Frontal Analysis ◽  
Mobile Phase Composition ◽  
Column Packing ◽  
Chromatographic Process ◽  
Mobile Phase Modifier ◽  
Methanol Vapour

A binary methanol vapour/hydrogen gas mixture has been used as the mobile phase in gas chromatography. Through the use of modified frontal analysis (undertaken just before measurements of the retention of the tested analytes), it has been possible to determine the adsorption isotherm of the mobile phase modifier (methanol) under typical conditions for a chromatographic process. It was found that adsorption of the mobile phase modifier on the column packing surface caused a decrease in the retention times of all the analytes tested. Furthermore, as a result of such adsorption, an increase in the degree of hydrophobization of the column packing surface also occurred, leading to a decrease of the selectivity of the packing.

Evaluation of Nitrous Oxide in the Gas Mixture for Anesthesia (ENIGMA) Studies

2017 ◽  
Vol 124 (6) ◽  
pp. 2077-2079 ◽  
Author(s):  
Girish P. Joshi ◽  
John H. Pennant ◽  
Henrik Kehlet
Keyword(s):  
Nitrous Oxide ◽  
Gas Mixture

A 3D-printed metal column for micro gas chromatography

Lab on a Chip ◽  
2020 ◽  
Vol 20 (18) ◽  
pp. 3435-3444
Author(s):  
Sooyeol Phyo ◽  
Sung Choi ◽  
Jaeheok Jang ◽  
Sun Choi ◽  
Jiwon Lee
Keyword(s):  
Gas Chromatography ◽  
Stationary Phase ◽  
Gas Mixture ◽  
Mixture Separation ◽  
Phase Coating ◽  
3D Printed ◽  
Pre Treatment

A square spiral 1 m-long column for gas mixture separation was 3D-printed out with the dimensions of 3.4 × 3.3 × 0.2, followed by pre-treatment and stationary phase coating.

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