Formation of Carbonyl and Carboxyl Groups on Cellulosic Pulps: Effect on Alkali Resistance
Ozone bleaching generates carbonyl groups on the cellulose polymer when applied to unbleached kraft pulps. This suggests that pulp fully bleached with a totally chlorine-free (TCF) sequence may contain more oxidized groups than standard elemental chlorine-free (ECF) bleached pulp. A fully bleached p...
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| Format: | Article |
| Language: | English |
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North Carolina State University
2014-10-01
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| Series: | BioResources |
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| Online Access: | http://ojs.cnr.ncsu.edu/index.php/BioRes/article/view/BioRes_09_4_7299_Perrin_Carbonyl_Carboxyl_Groups_Cellulosic_Pulps |
| _version_ | 1828970094236008448 |
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| author | Jordan Perrin Frédéric Pouyet Christine Chirat Dominique Lachenal |
| author_facet | Jordan Perrin Frédéric Pouyet Christine Chirat Dominique Lachenal |
| author_sort | Jordan Perrin |
| collection | DOAJ |
| description | Ozone bleaching generates carbonyl groups on the cellulose polymer when applied to unbleached kraft pulps. This suggests that pulp fully bleached with a totally chlorine-free (TCF) sequence may contain more oxidized groups than standard elemental chlorine-free (ECF) bleached pulp. A fully bleached pulp was treated with sodium hypochlorite to form oxidized groups (mostly carbonyls) on the pure carbohydrates, which were investigated during subsequent alkaline treatment. Carbonyl groups had a strong impact on color development during alkaline treatment. Among the carbonyls, the keto groups were the most active. This was confirmed by the behavior of carbohydrate model compounds that contained aldehyde, keto, and/or carboxyl groups when subjected to alkaline conditions. A subsequent hydrogen peroxide (P) stage effectively decreased the carbonyl content, which reduced yellowing during alkaline treatment. However, the oxidized cellulose was severely depolymerized. The addition of magnesium sulfate (Mg) into the P stage minimized depolymerization while maintaining some of the carbonyls in the carbohydrates. It is proposed that Mg cations can hinder alkaline β-elimination, possibly by forming a complex with the carbonyl groups. |
| first_indexed | 2024-12-14T12:44:49Z |
| format | Article |
| id | doaj.art-056d1ef9b316454eb8816dab9b545c2b |
| institution | Directory Open Access Journal |
| issn | 1930-2126 1930-2126 |
| language | English |
| last_indexed | 2024-12-14T12:44:49Z |
| publishDate | 2014-10-01 |
| publisher | North Carolina State University |
| record_format | Article |
| series | BioResources |
| spelling | doaj.art-056d1ef9b316454eb8816dab9b545c2b2022-12-21T23:00:49ZengNorth Carolina State UniversityBioResources1930-21261930-21262014-10-01947299731010.15376/biores.9.4.7299-7310Formation of Carbonyl and Carboxyl Groups on Cellulosic Pulps: Effect on Alkali ResistanceJordan Perrin0Frédéric Pouyet1Christine Chirat2Dominique Lachenal3 Univ. Grenoble Alpes; FranceUniv. Grenoble Alpes, LGP2, F-38000 Grenoble, France; FranceUniv. Grenoble Alpes, LGP2, F-38000 Grenoble, France; FranceUniv. Grenoble Alpes, LGP2, F-38000 Grenoble, France; FranceOzone bleaching generates carbonyl groups on the cellulose polymer when applied to unbleached kraft pulps. This suggests that pulp fully bleached with a totally chlorine-free (TCF) sequence may contain more oxidized groups than standard elemental chlorine-free (ECF) bleached pulp. A fully bleached pulp was treated with sodium hypochlorite to form oxidized groups (mostly carbonyls) on the pure carbohydrates, which were investigated during subsequent alkaline treatment. Carbonyl groups had a strong impact on color development during alkaline treatment. Among the carbonyls, the keto groups were the most active. This was confirmed by the behavior of carbohydrate model compounds that contained aldehyde, keto, and/or carboxyl groups when subjected to alkaline conditions. A subsequent hydrogen peroxide (P) stage effectively decreased the carbonyl content, which reduced yellowing during alkaline treatment. However, the oxidized cellulose was severely depolymerized. The addition of magnesium sulfate (Mg) into the P stage minimized depolymerization while maintaining some of the carbonyls in the carbohydrates. It is proposed that Mg cations can hinder alkaline β-elimination, possibly by forming a complex with the carbonyl groups.http://ojs.cnr.ncsu.edu/index.php/BioRes/article/view/BioRes_09_4_7299_Perrin_Carbonyl_Carboxyl_Groups_Cellulosic_PulpsFully bleached pulpCarbonyl groupsCarboxyl groupsAlkaline yellowingBrightness stabilityHypochlorous acid oxidationOzone oxidation |
| spellingShingle | Jordan Perrin Frédéric Pouyet Christine Chirat Dominique Lachenal Formation of Carbonyl and Carboxyl Groups on Cellulosic Pulps: Effect on Alkali Resistance BioResources Fully bleached pulp Carbonyl groups Carboxyl groups Alkaline yellowing Brightness stability Hypochlorous acid oxidation Ozone oxidation |
| title | Formation of Carbonyl and Carboxyl Groups on Cellulosic Pulps: Effect on Alkali Resistance |
| title_full | Formation of Carbonyl and Carboxyl Groups on Cellulosic Pulps: Effect on Alkali Resistance |
| title_fullStr | Formation of Carbonyl and Carboxyl Groups on Cellulosic Pulps: Effect on Alkali Resistance |
| title_full_unstemmed | Formation of Carbonyl and Carboxyl Groups on Cellulosic Pulps: Effect on Alkali Resistance |
| title_short | Formation of Carbonyl and Carboxyl Groups on Cellulosic Pulps: Effect on Alkali Resistance |
| title_sort | formation of carbonyl and carboxyl groups on cellulosic pulps effect on alkali resistance |
| topic | Fully bleached pulp Carbonyl groups Carboxyl groups Alkaline yellowing Brightness stability Hypochlorous acid oxidation Ozone oxidation |
| url | http://ojs.cnr.ncsu.edu/index.php/BioRes/article/view/BioRes_09_4_7299_Perrin_Carbonyl_Carboxyl_Groups_Cellulosic_Pulps |
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