Gas chromatographic unit for investigation of pyrolysis catalysts

1979 ◽  
Vol 15 (5) ◽  
pp. 380-383
Author(s):  
Yu. G. Egiazarov ◽  
B. Kh. Cherches ◽  
N. P. Krut'ko
Keyword(s):  
Chromatographic Unit

Separation of praziquantel enantiomers using simulated moving bed chromatographic unit with performance designed for semipreparative applications

Chirality ◽  
2019 ◽  
Vol 31 (8) ◽  
pp. 583-591 ◽  
Author(s):  
Felipe C. Cunha ◽  
Argimiro R. Secchi ◽  
Mauricio B. Souza ◽  
Amaro G. Barreto
Keyword(s):  
Simulated Moving Bed ◽  
Moving Bed ◽  
Chromatographic Unit

scholarly journals Supplementary material to "Optimization of a gas chromatographic unit for measuring BVOCs in ambient air"

2019 ◽  
Author(s):  
Kenneth Mermet ◽  
Stéphane Sauvage ◽  
Sébastien Dusanter ◽  
Thérèse Salameh ◽  
Thierry Léonardis ◽  
...  
Keyword(s):  
Ambient Air ◽  
Chromatographic Unit ◽  
Supplementary Material

Chromatographic unit for separation of light hydrocarbons from mixtures

1979 ◽  
Vol 15 (2) ◽  
pp. 140-142
Author(s):  
A. V. Garusov ◽  
V. I. Semkin ◽  
A. A. Muslinkin ◽  
A. A. Martynov
Keyword(s):  
Light Hydrocarbons ◽  
Chromatographic Unit

Analysis of Elastomers by Gas Chromatography

1964 ◽  
Vol 37 (1) ◽  
pp. 297-309 ◽  
Author(s):  
H. Hulot ◽  
P. Lebel
Keyword(s):  
Gas Chromatography ◽  
Small Samples ◽  
Feeding System ◽  
Analysis Method ◽  
Accurate Analysis ◽  
Volatile Products ◽  
Chromatographic Unit ◽  
Last Stage ◽  
Set Up ◽  
Basic Constituent

Abstract This study is the last stage in the design of a new analysis method for either pure or mixed elastomers. Such elastomers are polymers which, when brought to high temperatures, are dissociated into their basic constituent monomers (isoprene for natural rubber, isobutylene for butyl rubber, and so on) and other more or less volatile products. The principle of the study consists in analyzing such different fractions with a chromatographic unit which exhibit peaks used to differentiate various polymers according to their relative positions. The main novelty of the method is the elimination of less volatile fractions which are trapped in ice at 0° C, so that only lighter fractions are fed to the chromatograph. In order that the latter may be fully available or ready for analysis, pyrolysis is carried out directly in the carrier gas circuit, in a furnace set-up, instead of in the gas sample feeding system of the chromatographic unit. Pyrolysis made directly in the unit offers several advantages: Very accurate analysis, since all the pyrolyzate is fed to the unit; Very small samples (1–4 mg); Reduced handling.

scholarly journals Optimization of a gas chromatographic unit for measuring biogenic volatile organic compounds in ambient air

2019 ◽  
Vol 12 (11) ◽  
pp. 6153-6171 ◽  
Author(s):  
Kenneth Mermet ◽  
Stéphane Sauvage ◽  
Sébastien Dusanter ◽  
Thérèse Salameh ◽  
Thierry Léonardis ◽  
...  
Keyword(s):  
Gaseous Mixture ◽  
Ambient Air ◽  
Internal Diameter ◽  
Flame Ionization ◽  
Volatile Organic ◽  
Chromatographic Unit ◽  
Gas Chromatographic Method ◽  
First Time ◽  
Calibration Step ◽  
Accurate Quantification

Abstract. A new online gas chromatographic method dedicated to biogenic volatile organic compound (BVOC) analysis was developed for the measurement of a 20 BVOC gaseous mixture (isoprene; β-pinene; α-pinene; limonene; ocimene; myrcene; sabinene; Δ3-carene; camphene; 1,8 cineole; terpinolene; linalool; α-phellandrene; nopinone; citral; α-terpinene; β-caryophyllene; p-cymene; γ-terpinene; and 2-carene) at a time resolution of 90 min. The optimized method includes an online Peltier-cooled thermodesorption system sample trap made of Carbopack B coupled to a gas chromatographic system equipped with a 60 m, 0.25 mm internal diameter (i.d.) BPX5 column. Eluent was analysed using flame ionization detection (FID). Potassium iodide was identified as the best ozone scrubber for the 20 BVOC mixture. In order to obtain an accurate quantification of BVOC concentrations, the development of a reliable standard mixture was also required. Quantification of BVOCs was reported with a detection limit ranging from 4 ppt for α-pinene to 19 ppt for sabinene. The main source of uncertainty was the calibration step, stressing the need for certified gaseous standards for a wider panel of BVOCs. This new method was applied for the first time to measure BVOCs in a pine forest during the LANDEX episode 1 field campaign (summer 2017). All target BVOCs were detected at least once during the campaign. The two major monoterpenes observed were β-pinene and α-pinene, representing 60 % of the measured terpenoid concentration on average, while isoprene represented only 17 %. The uncertainties determined were always below 13 % for the six major terpenes.

scholarly journals Optimization of a gas chromatographic unit for measuring BVOCs in ambient air

2019 ◽  
Author(s):  
Kenneth Mermet ◽  
Stéphane Sauvage ◽  
Sébastien Dusanter ◽  
Thérèse Salameh ◽  
Thierry Léonardis ◽  
...  
Keyword(s):  
Detection Limit ◽  
Gaseous Mixture ◽  
Ambient Air ◽  
Flame Ionization ◽  
Volatile Organic ◽  
Chromatographic Unit ◽  
Gas Chromatographic Method ◽  
First Time ◽  
Calibration Step ◽  
Accurate Quantification

Abstract. A new online gas chromatographic method dedicated to Biogenic Volatile Organic Compounds (BVOC) analysis was developed for the measurement of a 20 BVOC gaseous mixture (isoprene, β-pinene, α-pinene, limonene, trans-β-ocimene, myrcene, sabinene, Δ3-carene, camphene, 1,8 cineole, terpinolene, linalool, α-phellandrene, nopinone, citral, α-terpinene, β-caryophhyllene, p-cymene, γ-terpinene and 2-carene) at a time resolution of 90 minutes. The optimized method includes an online Peltier-cooled thermodesorption system sample trap made of Carbopack B coupled to a gas chromatographic system equipped with a 60 m, 0.25 mm i.d. BPX5 column. Eluent was analysed using a flame ionization detection (FID). Potassium iodide was identified as the best ozone scrubber for the 20 BVOC mixture. In order to obtain an accurate quantification of BVOC concentrations, the development of a reliable standard mixture was also required. Quantification of BVOCs was reported with a detection limit ranging from 4 ppt for α-pinene to 19 ppt for sabinene. The main source of uncertainty was the calibration step, stressing the need of certified gaseous standards for a wider panel of BVOCs. This new method was applied for the first time to measure BVOCs in a pine forest during the LANDEX-episode-1 field campaign (summer 2017). All targeted BVOCs were detected at least once along the campaign. The two major monoterpenes observed were β-pinene and α-pinene, representing on average 60 % of the measured terpenoïds, while isoprene represented only 17 %. Uncertainties determined were always below 13 % for the six major terpenes. Uncertainties may be larger for the other compounds especially for those presenting a mixing ratio close to the detection limit.

scholarly journals Dextran and fructose separation on an SMB continuous chromatographic unit

2002 ◽  
Vol 12 (3) ◽  
pp. 215-221 ◽  
Author(s):  
Mariana S Coelho ◽  
Diana C.S Azevedo ◽  
José A Teixeira ◽  
Alı́rio Rodrigues
Keyword(s):  
Chromatographic Unit
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