Effects of Electrolyte pH on the Electro-Osmotic Characteristics in Anthracite | Zendy

Liankun Zhang | Zendy; Tianhe Kang | Zendy; Jianting Kang | Zendy; Xiaoyu Zhang | Zendy; Runxu Zhang | Zendy; Guanxian Kang | Zendy

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Effects of Electrolyte pH on the Electro-Osmotic Characteristics in Anthracite

Author(s) -

Liankun Zhang,

Tianhe Kang,

Jianting Kang,

Xiaoyu Zhang,

Runxu Zhang,

Guanxian Kang

Publication year - 2020

Publication title -

acs omega

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.779

H-Index - 40

ISSN - 2470-1343

DOI - 10.1021/acsomega.0c04013

Subject(s) - anthracite , chemistry , coalbed methane , electrolyte , drainage , extraction (chemistry) , osmosis , osmotic pressure , zeta potential , coal , methane , chromatography , chemical engineering , coal mining , membrane , biochemistry , electrode , engineering , ecology , organic chemistry , nanoparticle , biology

Accelerating the drainage of water in coal reservoirs can significantly improve the extraction efficiency of coalbed methane (CBM). The movement of water with different pH values in anthracite was tested and analyzed. The results showed that the electro-osmotic flow velocity increased first and then slightly decreased with the increase of time up to 120 h. The electro-osmotic flow was markedly strengthened under a strong acid (pH 2) or strong alkaline (pH 13) environment, and the direction of electro-osmosis was reversed at a pH of 3-4. The changes in zeta potential, surface groups, and minerals in anthracite were tested to analyze the mechanism of electro-osmotic characteristics. The results obtained from this work will provide a basis for the process of drainage and depressurization during the CBM extraction.

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