Chemical changes accompanying oxygenation of coal by air and deoxygenation of oxidized coal by thermal treatment
This paper presents the results of progressive dry oxidation of coal by air at 170 ± 10 °C with reference to its acidity and alkali solubility. A mechanism is suggested for the oxidative degradation of coal, which results in the formation of smaller carboxylated species, soluble in alkali. This help...
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| Veröffentlicht in: | Fuel (Guildford) 1989-09, Vol.68 (9), p.1129-1133 |
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| creator | Banerjee, Ashim K. Choudhury, Debapriya Choudhury, Samar S. |
| description | This paper presents the results of progressive dry oxidation of coal by air at 170 ± 10 °C with reference to its acidity and alkali solubility. A mechanism is suggested for the oxidative degradation of coal, which results in the formation of smaller carboxylated species, soluble in alkali. This helps to reconcile the differences in acidity observed between the oxidized coal and the alkali-soluble and -insoluble fractions derived from it. The alkali solubility of oxidized coal diminishes, but not proportionately, with progressive elimination of COOH groups by thermal decarboxylation. Formation of linear anhydrides between the smaller alkali-soluble species (humic acids) by condensation of adjacent carboxyl groups is also indicated. The anhydride linkage may undergo thermal decomposition, giving rise to ether-type oxygen bridges. Different reactions that may occur during thermal decarboxylation of oxidized coal and their effects on its alkali solubility are discussed. |
| doi_str_mv | 10.1016/0016-2361(89)90183-X |
| format | Article |
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A mechanism is suggested for the oxidative degradation of coal, which results in the formation of smaller carboxylated species, soluble in alkali. This helps to reconcile the differences in acidity observed between the oxidized coal and the alkali-soluble and -insoluble fractions derived from it. The alkali solubility of oxidized coal diminishes, but not proportionately, with progressive elimination of COOH groups by thermal decarboxylation. Formation of linear anhydrides between the smaller alkali-soluble species (humic acids) by condensation of adjacent carboxyl groups is also indicated. The anhydride linkage may undergo thermal decomposition, giving rise to ether-type oxygen bridges. Different reactions that may occur during thermal decarboxylation of oxidized coal and their effects on its alkali solubility are discussed.</description><identifier>ISSN: 0016-2361</identifier><identifier>EISSN: 1873-7153</identifier><identifier>DOI: 10.1016/0016-2361(89)90183-X</identifier><language>eng</language><publisher>Oxford: Elsevier Ltd</publisher><subject>alkali ; Applied sciences ; depolymerization ; Energy ; Exact sciences and technology ; Fuel processing. 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Different reactions that may occur during thermal decarboxylation of oxidized coal and their effects on its alkali solubility are discussed.</description><subject>alkali</subject><subject>Applied sciences</subject><subject>depolymerization</subject><subject>Energy</subject><subject>Exact sciences and technology</subject><subject>Fuel processing. Carbochemistry and petrochemistry</subject><subject>Fuels</subject><subject>Solid fuel processing (coal, coke, brown coal, peat, wood, etc.)</subject><subject>thermal analysis</subject><issn>0016-2361</issn><issn>1873-7153</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>1989</creationdate><recordtype>article</recordtype><recordid>eNqFkU1rGzEQhkVIII7bf5DDHkJJD9tKq5UlXQrB9AsCuaSQmxhLI1vBKznSJsT99ZXr4EMOCQwzc3jmneEdQs4Z_cIom32lNbUdn7FLpT9ryhRv747IhCnJW8kEPyaTA3JKzkq5p5RKJfoJ2cxXOAQL68auIC6xNGBtGjYQtyEum_S8XWKEMaTYJN_YVMHFtoGQG4iucfgKSM_Bhb_oDuS4wjzUdswI44Bx_EBOPKwLfnypU_Lnx_fb-a_2-ubn7_nVdWu5FmOrpQXpFtiBFZZ5rf2ihucdE34hOglOaSV7Qfuu6xVqD8pxxRkINpO903xKPu11Nzk9PGIZzRCKxfUaIqbHYjrB-pmi74NMUMZ41Z6Sfg_anErJ6M0mhwHy1jBqdn8wO5PNzmSjtPn_B3NXxy5e9KFUn32GaEM5zEpeLxG7M77tMaymPAXMptiA0aILGe1oXApv7_kHM32djw</recordid><startdate>19890901</startdate><enddate>19890901</enddate><creator>Banerjee, Ashim K.</creator><creator>Choudhury, Debapriya</creator><creator>Choudhury, Samar S.</creator><general>Elsevier Ltd</general><general>Elsevier</general><scope>IQODW</scope><scope>AAYXX</scope><scope>CITATION</scope><scope>7ST</scope><scope>C1K</scope><scope>SOI</scope><scope>8FD</scope><scope>F28</scope><scope>FR3</scope></search><sort><creationdate>19890901</creationdate><title>Chemical changes accompanying oxygenation of coal by air and deoxygenation of oxidized coal by thermal treatment</title><author>Banerjee, Ashim K. ; Choudhury, Debapriya ; Choudhury, Samar S.</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c395t-97ca7dbe2ac5c1f99fb9fbf3215fb527ad898745042248e9fa8d3831a51674d93</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>1989</creationdate><topic>alkali</topic><topic>Applied sciences</topic><topic>depolymerization</topic><topic>Energy</topic><topic>Exact sciences and technology</topic><topic>Fuel processing. 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| ispartof | Fuel (Guildford), 1989-09, Vol.68 (9), p.1129-1133 |
| issn | 0016-2361 1873-7153 |
| language | eng |
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| source | Elsevier ScienceDirect Journals |
| subjects | alkali Applied sciences depolymerization Energy Exact sciences and technology Fuel processing. Carbochemistry and petrochemistry Fuels Solid fuel processing (coal, coke, brown coal, peat, wood, etc.) thermal analysis |
| title | Chemical changes accompanying oxygenation of coal by air and deoxygenation of oxidized coal by thermal treatment |
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