Gas diffusion coefficient in coal: calculation of tangent slope accuracy through the inflection point determination
This investigation aims to develop an accurate method to calculate the tangent slope ( b ) - a fundamental parameter to calculate gas diffusion coefficients under different pressures - using inflection point determinations. The authors also studied the different tangent slope behaviours depending on...
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| Veröffentlicht in: | Journal of mining science 2016, Vol.52 (1), p.87-101 |
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| creator | Rodrigues, C. F. Dinis, M. A. P. Lemos de Sousa, M. J. |
| description | This investigation aims to develop an accurate method to calculate the tangent slope (
b
) - a fundamental parameter to calculate gas diffusion coefficients under different pressures - using inflection point determinations. The authors also studied the different tangent slope behaviours depending on the experimental gas sorption used. The single Langmuir model for individual gases and the extended Langmuir model, for multicomponent gas mixtures were applied to fit experimental gas sorption isotherm data. Two coals were selected in order to minimize and/or avoid the maceral composition and vitrinite mean random reflectance effects. Samples were submitted to three different gas compositions, viz. 99.999% CH
4
; 99.999% CO
2
; and a gas mixture containing 74.99% CH
4
+ 19.99% CO
2
+ 5.02% N
2
. Results showed that the first and the second derivatives calculated to define the first inflection points represent exactly the final limit of tangent slopes. |
| doi_str_mv | 10.1134/S1062739116010162 |
| format | Article |
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b
) - a fundamental parameter to calculate gas diffusion coefficients under different pressures - using inflection point determinations. The authors also studied the different tangent slope behaviours depending on the experimental gas sorption used. The single Langmuir model for individual gases and the extended Langmuir model, for multicomponent gas mixtures were applied to fit experimental gas sorption isotherm data. Two coals were selected in order to minimize and/or avoid the maceral composition and vitrinite mean random reflectance effects. Samples were submitted to three different gas compositions, viz. 99.999% CH
4
; 99.999% CO
2
; and a gas mixture containing 74.99% CH
4
+ 19.99% CO
2
+ 5.02% N
2
. Results showed that the first and the second derivatives calculated to define the first inflection points represent exactly the final limit of tangent slopes.</description><identifier>ISSN: 1062-7391</identifier><identifier>EISSN: 1573-8736</identifier><identifier>DOI: 10.1134/S1062739116010162</identifier><language>eng</language><publisher>Moscow: Pleiades Publishing</publisher><subject>Carbon dioxide ; Coal ; Coefficients ; Composition ; Composition effects ; Diffusion coefficient ; Diffusion coefficients ; Dye dispersion ; Earth and Environmental Science ; Earth Sciences ; Gas mixtures ; Gaseous diffusion ; Gases ; Geomechanics ; Geophysics/Geodesy ; Geotechnical Engineering & Applied Earth Sciences ; Inflection points ; Methane ; Mineral Resources ; Reflectance ; Slope ; Sorption</subject><ispartof>Journal of mining science, 2016, Vol.52 (1), p.87-101</ispartof><rights>Pleiades Publishing, Ltd. 2016</rights><rights>COPYRIGHT 2016 Springer</rights><rights>Copyright Springer Science & Business Media 2016</rights><lds50>peer_reviewed</lds50><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c451t-c7e7e2eb138d7383bc89cea23224df7a3ec3d90c9ab750e3a7e71f19cea2157d3</citedby><cites>FETCH-LOGICAL-c451t-c7e7e2eb138d7383bc89cea23224df7a3ec3d90c9ab750e3a7e71f19cea2157d3</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktopdf>$$Uhttps://link.springer.com/content/pdf/10.1134/S1062739116010162$$EPDF$$P50$$Gspringer$$H</linktopdf><linktohtml>$$Uhttps://link.springer.com/10.1134/S1062739116010162$$EHTML$$P50$$Gspringer$$H</linktohtml><link.rule.ids>314,780,784,27924,27925,41488,42557,51319</link.rule.ids></links><search><creatorcontrib>Rodrigues, C. F.</creatorcontrib><creatorcontrib>Dinis, M. A. P.</creatorcontrib><creatorcontrib>Lemos de Sousa, M. J.</creatorcontrib><title>Gas diffusion coefficient in coal: calculation of tangent slope accuracy through the inflection point determination</title><title>Journal of mining science</title><addtitle>J Min Sci</addtitle><description>This investigation aims to develop an accurate method to calculate the tangent slope (
b
) - a fundamental parameter to calculate gas diffusion coefficients under different pressures - using inflection point determinations. The authors also studied the different tangent slope behaviours depending on the experimental gas sorption used. The single Langmuir model for individual gases and the extended Langmuir model, for multicomponent gas mixtures were applied to fit experimental gas sorption isotherm data. Two coals were selected in order to minimize and/or avoid the maceral composition and vitrinite mean random reflectance effects. Samples were submitted to three different gas compositions, viz. 99.999% CH
4
; 99.999% CO
2
; and a gas mixture containing 74.99% CH
4
+ 19.99% CO
2
+ 5.02% N
2
. Results showed that the first and the second derivatives calculated to define the first inflection points represent exactly the final limit of tangent slopes.</description><subject>Carbon dioxide</subject><subject>Coal</subject><subject>Coefficients</subject><subject>Composition</subject><subject>Composition effects</subject><subject>Diffusion coefficient</subject><subject>Diffusion coefficients</subject><subject>Dye dispersion</subject><subject>Earth and Environmental Science</subject><subject>Earth Sciences</subject><subject>Gas mixtures</subject><subject>Gaseous diffusion</subject><subject>Gases</subject><subject>Geomechanics</subject><subject>Geophysics/Geodesy</subject><subject>Geotechnical Engineering & Applied Earth Sciences</subject><subject>Inflection points</subject><subject>Methane</subject><subject>Mineral Resources</subject><subject>Reflectance</subject><subject>Slope</subject><subject>Sorption</subject><issn>1062-7391</issn><issn>1573-8736</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2016</creationdate><recordtype>article</recordtype><recordid>eNp1kVFLwzAQx4soOKcfwLeCTz50Js3apL6NoXMwEJw-lyy9bBldM5MU3Lf3uvrgEMnDJfn__pe7XBTdUjKilI0flpTkKWcFpTmhhObpWTSgGWeJ4Cw_xz3KSadfRlfebwkhhciLQeRn0seV0br1xjaxsqC1UQaaEJvuKOvHWMlatbUMHWB1HGSz7nRf2z3EUqnWSXWIw8bZdr3BCGjVNaijYW8NshUEcDvTHJNcRxda1h5ufuIw-nh-ep--JIvX2Xw6WSRqnNGQKA4cUlhRJirOBFspUSiQKUvTcaW5ZKBYVRBVyBXPCDCJPNX0yGDrFRtGd33evbOfLfhQbm3rGnyypEIQkWfjLENq1FNrWUOJlduA_eCqYGeUbUAbvJ9khOREZDlHw_2JAZkAX2EtW-_L-fLtlKU9q5z13oEu987spDuUlJTd4Mo_g0NP2ns8svjV7lfZ_5q-Aa73mxE</recordid><startdate>2016</startdate><enddate>2016</enddate><creator>Rodrigues, C. F.</creator><creator>Dinis, M. A. P.</creator><creator>Lemos de Sousa, M. J.</creator><general>Pleiades Publishing</general><general>Springer</general><general>Springer Nature B.V</general><scope>AAYXX</scope><scope>CITATION</scope><scope>ISR</scope><scope>7TN</scope><scope>7UA</scope><scope>C1K</scope><scope>F1W</scope><scope>H96</scope><scope>L.G</scope></search><sort><creationdate>2016</creationdate><title>Gas diffusion coefficient in coal: calculation of tangent slope accuracy through the inflection point determination</title><author>Rodrigues, C. F. ; Dinis, M. A. P. ; Lemos de Sousa, M. J.</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c451t-c7e7e2eb138d7383bc89cea23224df7a3ec3d90c9ab750e3a7e71f19cea2157d3</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2016</creationdate><topic>Carbon dioxide</topic><topic>Coal</topic><topic>Coefficients</topic><topic>Composition</topic><topic>Composition effects</topic><topic>Diffusion coefficient</topic><topic>Diffusion coefficients</topic><topic>Dye dispersion</topic><topic>Earth and Environmental Science</topic><topic>Earth Sciences</topic><topic>Gas mixtures</topic><topic>Gaseous diffusion</topic><topic>Gases</topic><topic>Geomechanics</topic><topic>Geophysics/Geodesy</topic><topic>Geotechnical Engineering & Applied Earth Sciences</topic><topic>Inflection points</topic><topic>Methane</topic><topic>Mineral Resources</topic><topic>Reflectance</topic><topic>Slope</topic><topic>Sorption</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Rodrigues, C. F.</creatorcontrib><creatorcontrib>Dinis, M. A. P.</creatorcontrib><creatorcontrib>Lemos de Sousa, M. J.</creatorcontrib><collection>CrossRef</collection><collection>Gale In Context: Science</collection><collection>Oceanic Abstracts</collection><collection>Water Resources Abstracts</collection><collection>Environmental Sciences and Pollution Management</collection><collection>ASFA: Aquatic Sciences and Fisheries Abstracts</collection><collection>Aquatic Science & Fisheries Abstracts (ASFA) 2: Ocean Technology, Policy & Non-Living Resources</collection><collection>Aquatic Science & Fisheries Abstracts (ASFA) Professional</collection><jtitle>Journal of mining science</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Rodrigues, C. F.</au><au>Dinis, M. A. P.</au><au>Lemos de Sousa, M. J.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Gas diffusion coefficient in coal: calculation of tangent slope accuracy through the inflection point determination</atitle><jtitle>Journal of mining science</jtitle><stitle>J Min Sci</stitle><date>2016</date><risdate>2016</risdate><volume>52</volume><issue>1</issue><spage>87</spage><epage>101</epage><pages>87-101</pages><issn>1062-7391</issn><eissn>1573-8736</eissn><abstract>This investigation aims to develop an accurate method to calculate the tangent slope (
b
) - a fundamental parameter to calculate gas diffusion coefficients under different pressures - using inflection point determinations. The authors also studied the different tangent slope behaviours depending on the experimental gas sorption used. The single Langmuir model for individual gases and the extended Langmuir model, for multicomponent gas mixtures were applied to fit experimental gas sorption isotherm data. Two coals were selected in order to minimize and/or avoid the maceral composition and vitrinite mean random reflectance effects. Samples were submitted to three different gas compositions, viz. 99.999% CH
4
; 99.999% CO
2
; and a gas mixture containing 74.99% CH
4
+ 19.99% CO
2
+ 5.02% N
2
. Results showed that the first and the second derivatives calculated to define the first inflection points represent exactly the final limit of tangent slopes.</abstract><cop>Moscow</cop><pub>Pleiades Publishing</pub><doi>10.1134/S1062739116010162</doi><tpages>15</tpages><oa>free_for_read</oa></addata></record> |
| fulltext | fulltext |
| identifier | ISSN: 1062-7391 |
| ispartof | Journal of mining science, 2016, Vol.52 (1), p.87-101 |
| issn | 1062-7391 1573-8736 |
| language | eng |
| recordid | cdi_proquest_journals_1880865455 |
| source | SpringerNature Journals |
| subjects | Carbon dioxide Coal Coefficients Composition Composition effects Diffusion coefficient Diffusion coefficients Dye dispersion Earth and Environmental Science Earth Sciences Gas mixtures Gaseous diffusion Gases Geomechanics Geophysics/Geodesy Geotechnical Engineering & Applied Earth Sciences Inflection points Methane Mineral Resources Reflectance Slope Sorption |
| title | Gas diffusion coefficient in coal: calculation of tangent slope accuracy through the inflection point determination |
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