Nitrogen rejection from methane using dual-reflux pressure swing adsorption with a kinetically-selective adsorbent

Gongkui Xiao, Thomas L. Saleman, Yuan Zou, Gang Li, Eric F. May

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

Dual-reflux pressure swing adsorption (DR PSA) processes using a kinetically nitrogen selective molecular sieve carbon, MSC-3K 172, were investigated for the removal of nitrogen from a gas mixture consisting of 75 mol% CH 4 + 25 mol% N 2 . The four DR PSA configurations (PL-A, PH-A, PL-B and PH-B) were experimentally demonstrated and compared in terms of their nitrogen rejection and methane recovery performance. The experimental results indicated the PH-B configuration in general performed the best in terms of the methane product purity and recovery using the kinetic MSC-3K 172 adsorbent. A non-isothermal numerical model was constructed for the kinetic DR PSA process to simulate and optimise the performance of the PH-B configuration. Model predicted gas loadings on the adsorbent indicated that selectively removing nitrogen from methane was feasible when a feed step time close to the characteristic adsorption time of nitrogen was selected. The effective usage of the adsorption bed in the PH-B configuration was also numerically studied via the capacity ratio C, with the feed step time and light reflux flow as key operational parameters, at fixed heavy product-to-feed ratio, bed pressure ratio and feed location. The numerical model for the PH-B configuration was also employed to study the effect of pressure in the purge step beyond those conditions accessible in the experiment. The simulation results revealed that the PH-B configuration could achieve a separation performance of 90 mol% CH 4 in the light product with 90% CH 4 recovery when the pressure in the light purge column was lower than 40 kPa while the adsorption pressure was maintained at 500 kPa. This result opens new opportunities for efficiently upgrading sub-quality natural gas reserves.

Original languageEnglish
Pages (from-to)1038-1046
Number of pages9
JournalChemical Engineering Journal
Volume372
DOIs
Publication statusPublished - 15 Sep 2019

Fingerprint

Methane
Adsorbents
Nitrogen
methane
adsorption
Adsorption
nitrogen
Recovery
Numerical models
kinetics
Kinetics
Molecular sieves
Gas mixtures
natural gas
Natural gas
Carbon
Gases
carbon
gas
simulation

Cite this

@article{908b589392004b0e90e19190427ea01c,
title = "Nitrogen rejection from methane using dual-reflux pressure swing adsorption with a kinetically-selective adsorbent",
abstract = "Dual-reflux pressure swing adsorption (DR PSA) processes using a kinetically nitrogen selective molecular sieve carbon, MSC-3K 172, were investigated for the removal of nitrogen from a gas mixture consisting of 75 mol{\%} CH 4 + 25 mol{\%} N 2 . The four DR PSA configurations (PL-A, PH-A, PL-B and PH-B) were experimentally demonstrated and compared in terms of their nitrogen rejection and methane recovery performance. The experimental results indicated the PH-B configuration in general performed the best in terms of the methane product purity and recovery using the kinetic MSC-3K 172 adsorbent. A non-isothermal numerical model was constructed for the kinetic DR PSA process to simulate and optimise the performance of the PH-B configuration. Model predicted gas loadings on the adsorbent indicated that selectively removing nitrogen from methane was feasible when a feed step time close to the characteristic adsorption time of nitrogen was selected. The effective usage of the adsorption bed in the PH-B configuration was also numerically studied via the capacity ratio C, with the feed step time and light reflux flow as key operational parameters, at fixed heavy product-to-feed ratio, bed pressure ratio and feed location. The numerical model for the PH-B configuration was also employed to study the effect of pressure in the purge step beyond those conditions accessible in the experiment. The simulation results revealed that the PH-B configuration could achieve a separation performance of 90 mol{\%} CH 4 in the light product with 90{\%} CH 4 recovery when the pressure in the light purge column was lower than 40 kPa while the adsorption pressure was maintained at 500 kPa. This result opens new opportunities for efficiently upgrading sub-quality natural gas reserves.",
keywords = "Carbon molecular sieve, DR PSA, Methane upgrading, Nitrogen rejection, Sub-quality natural gas",
author = "Gongkui Xiao and Saleman, {Thomas L.} and Yuan Zou and Gang Li and May, {Eric F.}",
year = "2019",
month = "9",
day = "15",
doi = "10.1016/j.cej.2019.04.166",
language = "English",
volume = "372",
pages = "1038--1046",
journal = "Chemical Engineering Journal",
issn = "1385-8947",
publisher = "Elsevier Science & Technology",

}

Nitrogen rejection from methane using dual-reflux pressure swing adsorption with a kinetically-selective adsorbent. / Xiao, Gongkui; Saleman, Thomas L.; Zou, Yuan; Li, Gang; May, Eric F.

In: Chemical Engineering Journal, Vol. 372, 15.09.2019, p. 1038-1046.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Nitrogen rejection from methane using dual-reflux pressure swing adsorption with a kinetically-selective adsorbent

AU - Xiao, Gongkui

AU - Saleman, Thomas L.

AU - Zou, Yuan

AU - Li, Gang

AU - May, Eric F.

PY - 2019/9/15

Y1 - 2019/9/15

N2 - Dual-reflux pressure swing adsorption (DR PSA) processes using a kinetically nitrogen selective molecular sieve carbon, MSC-3K 172, were investigated for the removal of nitrogen from a gas mixture consisting of 75 mol% CH 4 + 25 mol% N 2 . The four DR PSA configurations (PL-A, PH-A, PL-B and PH-B) were experimentally demonstrated and compared in terms of their nitrogen rejection and methane recovery performance. The experimental results indicated the PH-B configuration in general performed the best in terms of the methane product purity and recovery using the kinetic MSC-3K 172 adsorbent. A non-isothermal numerical model was constructed for the kinetic DR PSA process to simulate and optimise the performance of the PH-B configuration. Model predicted gas loadings on the adsorbent indicated that selectively removing nitrogen from methane was feasible when a feed step time close to the characteristic adsorption time of nitrogen was selected. The effective usage of the adsorption bed in the PH-B configuration was also numerically studied via the capacity ratio C, with the feed step time and light reflux flow as key operational parameters, at fixed heavy product-to-feed ratio, bed pressure ratio and feed location. The numerical model for the PH-B configuration was also employed to study the effect of pressure in the purge step beyond those conditions accessible in the experiment. The simulation results revealed that the PH-B configuration could achieve a separation performance of 90 mol% CH 4 in the light product with 90% CH 4 recovery when the pressure in the light purge column was lower than 40 kPa while the adsorption pressure was maintained at 500 kPa. This result opens new opportunities for efficiently upgrading sub-quality natural gas reserves.

AB - Dual-reflux pressure swing adsorption (DR PSA) processes using a kinetically nitrogen selective molecular sieve carbon, MSC-3K 172, were investigated for the removal of nitrogen from a gas mixture consisting of 75 mol% CH 4 + 25 mol% N 2 . The four DR PSA configurations (PL-A, PH-A, PL-B and PH-B) were experimentally demonstrated and compared in terms of their nitrogen rejection and methane recovery performance. The experimental results indicated the PH-B configuration in general performed the best in terms of the methane product purity and recovery using the kinetic MSC-3K 172 adsorbent. A non-isothermal numerical model was constructed for the kinetic DR PSA process to simulate and optimise the performance of the PH-B configuration. Model predicted gas loadings on the adsorbent indicated that selectively removing nitrogen from methane was feasible when a feed step time close to the characteristic adsorption time of nitrogen was selected. The effective usage of the adsorption bed in the PH-B configuration was also numerically studied via the capacity ratio C, with the feed step time and light reflux flow as key operational parameters, at fixed heavy product-to-feed ratio, bed pressure ratio and feed location. The numerical model for the PH-B configuration was also employed to study the effect of pressure in the purge step beyond those conditions accessible in the experiment. The simulation results revealed that the PH-B configuration could achieve a separation performance of 90 mol% CH 4 in the light product with 90% CH 4 recovery when the pressure in the light purge column was lower than 40 kPa while the adsorption pressure was maintained at 500 kPa. This result opens new opportunities for efficiently upgrading sub-quality natural gas reserves.

KW - Carbon molecular sieve

KW - DR PSA

KW - Methane upgrading

KW - Nitrogen rejection

KW - Sub-quality natural gas

UR - http://www.scopus.com/inward/record.url?scp=85065103023&partnerID=8YFLogxK

U2 - 10.1016/j.cej.2019.04.166

DO - 10.1016/j.cej.2019.04.166

M3 - Article

VL - 372

SP - 1038

EP - 1046

JO - Chemical Engineering Journal

JF - Chemical Engineering Journal

SN - 1385-8947

ER -