C3H8 synergistic flue gas (CO2+N2) replacement of CH4 hydrate

Guo Jinyuan; Chen Xiao; Gui Xia

doi:10.1016/j.cjche.2025.09.025

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C₃H₈ synergistic flue gas (CO₂+N₂) replacement of CH₄ hydrate

Updated：2026-05-14

- C₃H₈ synergistic flue gas (CO₂+N₂) replacement of CH₄ hydrate
- Chinese Journal of Chemical Engineering Vol. 90, Issue 2, Pages: 18-32(2026)
- Affiliations：
  
  College of Chemical Engineering, Nanjing Tech University, Nanjing 211816, China
- Author bio：
  
  Corresponding author. E-mail address: guixia@njtech.edu.cn (X. Gui).
- Funds：
- DOI：10.1016/j.cjche.2025.09.025
  CLC：
- Received：03 July 2025，
  
  Revised：2025-08-16，
  
  Accepted：12 September 2025，
  
  Online First：19 November 2025，
  
  Published：2026-02
- Accepted：
Scan QR Code
Guo Jinyuan, Chen Xiao, Gui Xia. C₃H₈ synergistic flue gas (CO₂+N₂) replacement of CH₄ hydrate[J]. Chinese Journal of Chemical Engineering, 2026, 90(2): 18-32. DOI: 10.1016/j.cjche.2025.09.025.
DOI：

Guo Jinyuan, Chen Xiao, Gui Xia. C₃H₈ synergistic flue gas (CO₂+N₂) replacement of CH₄ hydrate[J]. Chinese Journal of Chemical Engineering, 2026, 90(2): 18-32. DOI: 10.1016/j.cjche.2025.09.025. DOI：

摘要

Abstract

There are bottleneck problems in the binary replacement process of flue gas (CO

)

such as the decreased stability of the sediment layer of hydrates after replacement and the decline in replacement efficiency. This paper innovatively proposes a pathway for the replacement of natural gas hydrates by flue gas with the synergistic effect of C

. The study reveals that doping a trace amount of C

(approximately 2% (mol)) can increase the dissociation enthalpy value of flue gas hydrates by nearly 20 kJ·mol

-1

. The crystal structure of the hydrates significantly transforms from the sI type to the sII type

which promotes the occupation of N

molecules in the small cages (with an increase of about 5%). This leads to a reduction of the phase equilibrium conditions by 15% to 25% through molecular scale pressure sharing. C

and N

have a synergistic effect on the re

covery of CH

hydrates. Compared with the flue gas without C

doping

the flue gas doped with 3.5% C

can increase the CH

recovery rate by approximately 4.5% and the N

sequestration rate by about 5%

while maintaining a high CO

sequestration rate. Since it is a surface reaction

doping an excessive amount of C

(more than 5%) does not significantly improve the CH

recovery rate. This study provides a new option for the design of engineering schemes and processes for the replacement-based exploitation of natural gas hydrates.

关键词

Keywords

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