Recovery of methane from coal-bed methane gas mixture via hydrate-based methane separation method by adding anionic surfactants

ABSTRACT

To screen a preferable kinetics promoter, the effects of sodium dodecyl sulfate (SDS) and sodium dodecyl benzene sulfonate (SDBS) within tetrahydrofuran (THF) solution on recovering methane (CH₄) from simulated coal-bed methane (CBM) were investigated at 279.15 K and 1.50–4.50 MPa. The results show the addition of surfactants can remarkably enhance the hydrate formation rate. However, gas uptake, CH₄ split fraction and split factor in THF-SDS solution are superior to those in THF-SDBS solution. Therefore, THF-SDS solution is an ​appropriately integrated additive for recovering CH₄ from coal-bed methane gas mixture.

KEYWORDS:

• Coal-bed methane
• gas hydrate
• gas uptake
• hydrate formation rate
• separation

Additional information

Funding

This work is supported by Key Program of National Natural Science Foundation of China [51736009], National Key R&D Program of China [2016YFC0304002, 2017YFC0307306], National Natural Science Fund [51476174], CAS Science and Technology Apparatus Development Program [YZ201619], Frontier Sciences Key Research Program of the Chinese Academy of Sciences [QYZDJ-SSW-JSC033] and National Natural Science Fund of Guangdong Province, China [2017A030313301].