Chemical Recovery in TEMPO Oxidation
To be regarded as environmentally friendly and economical, an industrial process using 2,2,6,6-tetramethylpiperidine 1-oxyl (TEMPO) oxidation requires recycling and/or recovery of chemicals. In this work, hypochlorite recycling via electrolysis was evaluated and potential means for TEMPO recovery we...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
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North Carolina State University
2016-05-01
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| Series: | BioResources |
| Subjects: | |
| Online Access: | http://ojs.cnr.ncsu.edu/index.php/BioRes/article/view/BioRes_11_3_6050_Kuutti_Chemical_Recovery_Tempo_Oxidation |
| _version_ | 1818383930430062592 |
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| author | Lauri Kuutti Heikki Pajari Stella Rovio Juha Kokkonen Markus Nuopponen |
| author_facet | Lauri Kuutti Heikki Pajari Stella Rovio Juha Kokkonen Markus Nuopponen |
| author_sort | Lauri Kuutti |
| collection | DOAJ |
| description | To be regarded as environmentally friendly and economical, an industrial process using 2,2,6,6-tetramethylpiperidine 1-oxyl (TEMPO) oxidation requires recycling and/or recovery of chemicals. In this work, hypochlorite recycling via electrolysis was evaluated and potential means for TEMPO recovery were explored. The most important variable affecting electrochemical hypochlorite conversion was the concentration of sodium chloride in the feed solution. With 30 g/L NaCl salt, a sufficient hypochlorite concentration of 0.8% could be obtained for pulp oxidation of up to 5% consistency. The regeneration of hypochlorite in the treated TEMPO solution was possible by electrolysis and further oxidation performed with only a small addition of make-up chemicals. During electrolysis, some TEMPO degradation took place; therefore, recovery of TEMPO should be done prior to electrolysis. For the recovery of TEMPO, solid phase extraction (SPE) was tested. The best recovery of TEMPO was obtained using a combination of hydrophobic SPE resin material and distillation (yields between 52% and 87%). |
| first_indexed | 2024-12-14T03:14:11Z |
| format | Article |
| id | doaj.art-9bd92406e7c04cc48896e67c8fa14fbf |
| institution | Directory Open Access Journal |
| issn | 1930-2126 1930-2126 |
| language | English |
| last_indexed | 2024-12-14T03:14:11Z |
| publishDate | 2016-05-01 |
| publisher | North Carolina State University |
| record_format | Article |
| series | BioResources |
| spelling | doaj.art-9bd92406e7c04cc48896e67c8fa14fbf2022-12-21T23:19:11ZengNorth Carolina State UniversityBioResources1930-21261930-21262016-05-011136050606110.15376/biores.11.3.6050-6061Chemical Recovery in TEMPO OxidationLauri Kuutti0Heikki Pajari1Stella Rovio2Juha Kokkonen3Markus Nuopponen4VTT Technical Research Centre of Finland Ltd, P.O. Box 1000, 02044 Espoo, Finland; FinlandVTT Technical Research Centre of Finland Ltd, P.O. Box 1000, 02044 Espoo, Finland; FinlandVTT Technical Research Centre of Finland Ltd, P.O. Box 1000, 02044 Espoo, Finland; FinlandVTT Expert Services Ltd, P.O. Box 1001, 02044 VTT, Finland; FinlandUPM, Alvar Aallon katu 1, 00101 Helsinki, Finland; FinlandTo be regarded as environmentally friendly and economical, an industrial process using 2,2,6,6-tetramethylpiperidine 1-oxyl (TEMPO) oxidation requires recycling and/or recovery of chemicals. In this work, hypochlorite recycling via electrolysis was evaluated and potential means for TEMPO recovery were explored. The most important variable affecting electrochemical hypochlorite conversion was the concentration of sodium chloride in the feed solution. With 30 g/L NaCl salt, a sufficient hypochlorite concentration of 0.8% could be obtained for pulp oxidation of up to 5% consistency. The regeneration of hypochlorite in the treated TEMPO solution was possible by electrolysis and further oxidation performed with only a small addition of make-up chemicals. During electrolysis, some TEMPO degradation took place; therefore, recovery of TEMPO should be done prior to electrolysis. For the recovery of TEMPO, solid phase extraction (SPE) was tested. The best recovery of TEMPO was obtained using a combination of hydrophobic SPE resin material and distillation (yields between 52% and 87%).http://ojs.cnr.ncsu.edu/index.php/BioRes/article/view/BioRes_11_3_6050_Kuutti_Chemical_Recovery_Tempo_OxidationSolid polymer phaseRecoveryRegenerationElectrolysisTEMPO oxidation |
| spellingShingle | Lauri Kuutti Heikki Pajari Stella Rovio Juha Kokkonen Markus Nuopponen Chemical Recovery in TEMPO Oxidation BioResources Solid polymer phase Recovery Regeneration Electrolysis TEMPO oxidation |
| title | Chemical Recovery in TEMPO Oxidation |
| title_full | Chemical Recovery in TEMPO Oxidation |
| title_fullStr | Chemical Recovery in TEMPO Oxidation |
| title_full_unstemmed | Chemical Recovery in TEMPO Oxidation |
| title_short | Chemical Recovery in TEMPO Oxidation |
| title_sort | chemical recovery in tempo oxidation |
| topic | Solid polymer phase Recovery Regeneration Electrolysis TEMPO oxidation |
| url | http://ojs.cnr.ncsu.edu/index.php/BioRes/article/view/BioRes_11_3_6050_Kuutti_Chemical_Recovery_Tempo_Oxidation |
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