HAL will be down for maintenance from Friday, June 10 at 4pm through Monday, June 13 at 9am. More information
Skip to Main content Skip to Navigation
Journal articles

Novel field-portable high-pressure adsorbent tube sampler prototype for the direct in situ preconcentration of trace compounds in gases at their working pressures: application to biomethane

Abstract : In Europe, renewable energy gases such as biomethane are aimed at substituting natural gas provided their stringent compliance to natural gas quality standards stipulating maximal levels of several chemical trace compounds (TC). Preconcentration is generally required to detect TC and inasmuch as biomethane is compressed for injection in the natural gas grid, preconcentration is commonly either done by collecting the bulk pressurized gas in a high-pressure cylinder or by first depressurizing it to collect a bulk volume in e.g. a gas sampling bag. Such whole gas samples are then transported to the lab and transferred to a preconcentration unit, entailing contamination and TC loss risks. Therefore, here a novel handy fieldportable device for the direct in situ high-pressure preconcentration of TC is presented, enabling to sample gases at pressures up to 200 bar a through a self-assembled Tenax®TA + Carbopack™X multibed adsorbent tube. The effect of the gas sampling pressure on the preconcentration of TC on adsorbent tubes was evaluated using a synthetic gas mixture containing 41 halogenated volatile organic compounds each at 1 ppm mol in N 2. At given normalized sampled volumes and in the pressure range 5-100 bar a handled in French gas transport grids, the pressure had no influence on the preconcentration when the gas circulates through the adsorbent tubes and as long as the adsorbents are not saturated. Next, for the first time, a real biomethane stream was sampled using the novel direct high-pressure preconcentration method on Tenax®TA + Carbopack™X multibed adsorbent tubes, allowing to preconcentrate, in a single sampling run, a wide range of volatile organic TC. More than 26 distinct TC were detected, belonging to seven chemical families: alkenes, aromatics, alkanes (linear, cyclic and polycyclic), sulphur-compounds and terpenes, with linear alkanes (pentane, heptane, octane) and terpenes predominating. Semi-quantification indicated pentane, dimethylcyclopropane, hexane, heptane, octane, a-pinene and camphene are present at a #1 ppm mol concentration threshold in the biomethane.
Document type :
Journal articles
Complete list of metadata

https://hal-univ-pau.archives-ouvertes.fr/hal-03625631
Contributor : Brice Bouyssiere Connect in order to contact the contributor
Submitted on : Thursday, March 31, 2022 - 7:59:38 AM
Last modification on : Monday, May 9, 2022 - 11:02:25 AM

File

RSC Advances 2022 12 pp10071-1...
Publisher files allowed on an open archive

Identifiers

Collections

Citation

Aurore Lecharlier, Carrier Hervé, Brice Bouyssière, Guilhem Caumette, Pierre Chiquet, et al.. Novel field-portable high-pressure adsorbent tube sampler prototype for the direct in situ preconcentration of trace compounds in gases at their working pressures: application to biomethane. RSC Advances, Royal Society of Chemistry, 2022, 12 (16), pp.10071-10087. ⟨10.1039/d2ra00601d⟩. ⟨hal-03625631⟩

Share

Metrics

Record views

10

Files downloads

7