Fractal Dimension and Nuclear Magnetic Resonance Characteristics of Surfactants for Coal Gas Desorption

In this paper, the fractal dimension of coal surfaces was calculated using theory, and influence different surfactants on surface studied. Six kinds sustainable traditional used in gas desorption processes were compared analyzed. We mineral fertilizer from Huainan Liuzhuang, China, as research object studied sodium dodecyl benzene sulfonate (SDBS), cohol diethanolamide (CDEA), nonylphenol polyoxyethylene ether (NP-10), tea saponin, sucrose ester rhamnolipid to modify coal. The methane adsorption capacity before after surfactant modification measured by low field nuclear magnetic resonance adsorption, Langmuir volume pressure obtained according fitting equation. results showed that perspective dimensions, best context sustainability (in order) is rhamnolipid, CDEA, ester. According two important parameters VL PL equation, sample modified had strongest capacity. numerical analysis DS surfactants, soluble organic matter raw samples dissolved, micropore morphology evolved become mesoporous or macroporous, which more favorable for desorption. SDBS ability.