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

Guo Jinyuan; Chen Xiao; Gui Xia

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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
- C₃H₈ synergistic flue gas (CO₂+N₂) replacement of CH₄ hydrate
- 中国化学工程学报（英文） 2026年90卷第2期页码：18-32
- 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：
  中图分类号：
- 收稿：2025-07-03，
  
  修回：2025-08-16，
  
  录用：2025-09-12，
  
  网络首发：2025-11-19，
  
  纸质出版：2026-02
- Accepted：
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Guo Jinyuan, Chen Xiao, Gui Xia. C₃H₈ synergistic flue gas (CO₂+N₂) replacement of CH₄ hydrate[J]. 中国化学工程学报（英文）, 2026,90(2):18-32.

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.
Guo Jinyuan, Chen Xiao, Gui Xia. C₃H₈ synergistic flue gas (CO₂+N₂) replacement of CH₄ hydrate[J]. 中国化学工程学报（英文）, 2026,90(2):18-32. 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：

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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