Behavior of carbohydrate-based material in black liquor during heating
One industrial softwood Kraft black liquor was heat-treated (at 175 ?C and 190 ?C for 15-60 min) together with laboratory-made soda-AQ (wheat straw and reed canary grass) and Kraft (reed canary grass) black liquors (at 190 ?C for 30 min). The feedstock black liquors were characterized with respect t...
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| Veröffentlicht in: | Thermal science 2004, Vol.8 (2), p.81-92 |
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| creator | Louhelainen, Jarmo Raimo, Alén |
| description | One industrial softwood Kraft black liquor was heat-treated (at 175 ?C and 190 ?C for 15-60 min) together with laboratory-made soda-AQ (wheat straw and reed canary grass) and Kraft (reed canary grass) black liquors (at 190 ?C for 30 min). The feedstock black liquors were characterized with respect to their polysaccharide (mainly xylem) and aliphatic carboxylic acid contents before and after the heat treatments. It was noted that, due to the higher amount of polysaccharides in the non-wood black liquors (8.2-16.6% of d.s) compared to that in the softwood black liquor (1.4% of d.s), the heat treatment in the former case resulted in a 5-30% increase in the amount of aliphatic acids formed by various alkali-catalyzed degradation reactions of the liquor polysaccharides. In addition, in each case detailed gas chromatographic studies revealed that as a general trend the content of higher-molecular-mass acids decreased on heating with the subsequent increase in the content of lower-molecular-mass acids. |
| doi_str_mv | 10.2298/TSCI0402081L |
| format | Article |
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The feedstock black liquors were characterized with respect to their polysaccharide (mainly xylem) and aliphatic carboxylic acid contents before and after the heat treatments. It was noted that, due to the higher amount of polysaccharides in the non-wood black liquors (8.2-16.6% of d.s) compared to that in the softwood black liquor (1.4% of d.s), the heat treatment in the former case resulted in a 5-30% increase in the amount of aliphatic acids formed by various alkali-catalyzed degradation reactions of the liquor polysaccharides. In addition, in each case detailed gas chromatographic studies revealed that as a general trend the content of higher-molecular-mass acids decreased on heating with the subsequent increase in the content of lower-molecular-mass acids.</description><identifier>ISSN: 0354-9836</identifier><identifier>EISSN: 2334-7163</identifier><identifier>DOI: 10.2298/TSCI0402081L</identifier><language>eng</language><publisher>Belgrade: Society of Thermal Engineers of Serbia</publisher><subject>Acids ; Aliphatic compounds ; Black liquor ; Carbohydrates ; Carboxylic acids ; Chemical reactions ; Gas chromatography ; Grasses ; Heat treatment ; Liquor ; Polysaccharides ; Straw</subject><ispartof>Thermal science, 2004, Vol.8 (2), p.81-92</ispartof><rights>2004. This work is licensed under https://creativecommons.org/licenses/by-nc-nd/4.0/ (the “License”). Notwithstanding the ProQuest Terms and Conditions, you may use this content in accordance with the terms of the License.</rights><lds50>peer_reviewed</lds50><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c146l-834f4a30701bb8871113edf13d467927094afc9df830d10ede01181f2f4788bf3</citedby></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><link.rule.ids>314,780,784,4022,27921,27922,27923</link.rule.ids></links><search><creatorcontrib>Louhelainen, Jarmo</creatorcontrib><creatorcontrib>Raimo, Alén</creatorcontrib><title>Behavior of carbohydrate-based material in black liquor during heating</title><title>Thermal science</title><description>One industrial softwood Kraft black liquor was heat-treated (at 175 ?C and 190 ?C for 15-60 min) together with laboratory-made soda-AQ (wheat straw and reed canary grass) and Kraft (reed canary grass) black liquors (at 190 ?C for 30 min). The feedstock black liquors were characterized with respect to their polysaccharide (mainly xylem) and aliphatic carboxylic acid contents before and after the heat treatments. It was noted that, due to the higher amount of polysaccharides in the non-wood black liquors (8.2-16.6% of d.s) compared to that in the softwood black liquor (1.4% of d.s), the heat treatment in the former case resulted in a 5-30% increase in the amount of aliphatic acids formed by various alkali-catalyzed degradation reactions of the liquor polysaccharides. In addition, in each case detailed gas chromatographic studies revealed that as a general trend the content of higher-molecular-mass acids decreased on heating with the subsequent increase in the content of lower-molecular-mass acids.</description><subject>Acids</subject><subject>Aliphatic compounds</subject><subject>Black liquor</subject><subject>Carbohydrates</subject><subject>Carboxylic acids</subject><subject>Chemical reactions</subject><subject>Gas chromatography</subject><subject>Grasses</subject><subject>Heat treatment</subject><subject>Liquor</subject><subject>Polysaccharides</subject><subject>Straw</subject><issn>0354-9836</issn><issn>2334-7163</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2004</creationdate><recordtype>article</recordtype><sourceid>ABUWG</sourceid><sourceid>AFKRA</sourceid><sourceid>AZQEC</sourceid><sourceid>BENPR</sourceid><sourceid>CCPQU</sourceid><sourceid>DWQXO</sourceid><recordid>eNpNkDFPwzAUhC0EEqGw8QMssRJ4zzaOM0JEoVIkBsocObFNUtKktROk_nuMysB0N9x7p_sIuUa4YyxX9-v3YgUCGCgsT0jCOBdphpKfkgT4g0hzxeU5uQhhAyClUllClk-21d_d6OnoaKN9PbYH4_Vk01oHa-g2Wt_pnnYDrXvdfNG-288xbmbfDZ-0tXqKeknOnO6DvfrTBflYPq-L17R8e1kVj2XaoJB9qrhwQnPIAOs69iMit8YhN0JmOcsgF9o1uXGKg0GwxgKiQsecyJSqHV-Qm-PfnR_3sw1TtRlnP8TKiomIIN7FvQtye0w1fgzBW1ftfLfV_lAhVL-kqv-k-A_NVFp0</recordid><startdate>2004</startdate><enddate>2004</enddate><creator>Louhelainen, Jarmo</creator><creator>Raimo, Alén</creator><general>Society of Thermal Engineers of Serbia</general><scope>AAYXX</scope><scope>CITATION</scope><scope>7TB</scope><scope>8FD</scope><scope>8FE</scope><scope>8FG</scope><scope>ABJCF</scope><scope>ABUWG</scope><scope>AFKRA</scope><scope>ARAPS</scope><scope>AZQEC</scope><scope>BENPR</scope><scope>BGLVJ</scope><scope>CCPQU</scope><scope>D1I</scope><scope>DWQXO</scope><scope>FR3</scope><scope>HCIFZ</scope><scope>KB.</scope><scope>L6V</scope><scope>M7S</scope><scope>P5Z</scope><scope>P62</scope><scope>PDBOC</scope><scope>PIMPY</scope><scope>PQEST</scope><scope>PQQKQ</scope><scope>PQUKI</scope><scope>PRINS</scope><scope>PTHSS</scope></search><sort><creationdate>2004</creationdate><title>Behavior of carbohydrate-based material in black liquor during heating</title><author>Louhelainen, Jarmo ; 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The feedstock black liquors were characterized with respect to their polysaccharide (mainly xylem) and aliphatic carboxylic acid contents before and after the heat treatments. It was noted that, due to the higher amount of polysaccharides in the non-wood black liquors (8.2-16.6% of d.s) compared to that in the softwood black liquor (1.4% of d.s), the heat treatment in the former case resulted in a 5-30% increase in the amount of aliphatic acids formed by various alkali-catalyzed degradation reactions of the liquor polysaccharides. In addition, in each case detailed gas chromatographic studies revealed that as a general trend the content of higher-molecular-mass acids decreased on heating with the subsequent increase in the content of lower-molecular-mass acids.</abstract><cop>Belgrade</cop><pub>Society of Thermal Engineers of Serbia</pub><doi>10.2298/TSCI0402081L</doi><tpages>12</tpages><oa>free_for_read</oa></addata></record> |
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| subjects | Acids Aliphatic compounds Black liquor Carbohydrates Carboxylic acids Chemical reactions Gas chromatography Grasses Heat treatment Liquor Polysaccharides Straw |
| title | Behavior of carbohydrate-based material in black liquor during heating |
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