Evaluating the Rate Equation of Delignification Reaction of Populus deltoides
Because of importance and wide usage of different species of Populus wood in paper pulping, the delignification reaction in pulping process of P. deltoides was investigated in order to obtain the relation between residual lignin in the pulp and cooking time. The samples were 10 years olded of Populu...
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| Format: | Article |
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Regional Information Center for Science and Technology (RICeST)
2017-04-01
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| Series: | تحقیقات علوم چوب و کاغذ ایران |
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| Online Access: | http://ijwpr.areeo.ac.ir/article_107119_9263ce63bffb1fccac8735792d4d6244.pdf |
| _version_ | 1819195439188017152 |
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| author | Mohammad Mahdi Barazandeh Saeid Mahdavi Abbas Fakhryan |
| author_facet | Mohammad Mahdi Barazandeh Saeid Mahdavi Abbas Fakhryan |
| author_sort | Mohammad Mahdi Barazandeh |
| collection | DOAJ |
| description | Because of importance and wide usage of different species of Populus wood in paper pulping, the delignification reaction in pulping process of P. deltoides was investigated in order to obtain the relation between residual lignin in the pulp and cooking time. The samples were 10 years olded of Populus deltoids woods which were collected from Chamestan Research Station located in Noor city of Mazandaran province. Kraft method was used for pulping the condition of which were 25% sulfidity, 14% alkali, 5:1 the ratio of liquor to sample, maximum cooking temperature as 155, 165, 175 degree centigrade. Kappa number and the yields of pulps were estimated and residual lignin was calculated for each sample. Using the models predicted for rate equation and trial and error method in excell software, the order and rate constant of delignification reaction were evaluated for each cooking temperature. The results show that the rate equations of delignification reaction of Populus deltoides in temperatures of 155°C, 165°C and 175°C have the orders of 5.5, 2.5 , 1 and the rate constants of 1.8× 10-7 min.-1 conc.-4.5, 7.7× 10-4 min.-1 conc.-1.5 and 3.5× 10-3 min.-1 , respectively. Using these equations it will be possible to control the pulping process and predict the time required to obtain a desired lignin concentration in the pulp. |
| first_indexed | 2024-12-23T02:12:46Z |
| format | Article |
| id | doaj.art-c88793c59c474b87a752acfbe0f0c898 |
| institution | Directory Open Access Journal |
| issn | 1735-0913 2383-112X |
| language | fas |
| last_indexed | 2024-12-23T02:12:46Z |
| publishDate | 2017-04-01 |
| publisher | Regional Information Center for Science and Technology (RICeST) |
| record_format | Article |
| series | تحقیقات علوم چوب و کاغذ ایران |
| spelling | doaj.art-c88793c59c474b87a752acfbe0f0c8982022-12-21T18:03:44ZfasRegional Information Center for Science and Technology (RICeST)تحقیقات علوم چوب و کاغذ ایران1735-09132383-112X2017-04-01321253210.22092/ijwpr.2017.107119107119Evaluating the Rate Equation of Delignification Reaction of Populus deltoidesMohammad Mahdi Barazandeh0Saeid Mahdavi1Abbas Fakhryan2Assistant Prof., Wood and forest products division, Research Institute of Forests and Rangelands, Agricultural Research Education and Extension Organization (AREEO), Tehran, IranAssociate Prof., Wood and forest products division, Research Institute of Forests and Rangelands, Agricultural Research Education and Extension Organization (AREEO), Tehran, IranM.Sc., Wood and forest products division, Research Institute of Forests and Rangelands, Agricultural Research Education and Extension Organization (AREEO), Tehran, IranBecause of importance and wide usage of different species of Populus wood in paper pulping, the delignification reaction in pulping process of P. deltoides was investigated in order to obtain the relation between residual lignin in the pulp and cooking time. The samples were 10 years olded of Populus deltoids woods which were collected from Chamestan Research Station located in Noor city of Mazandaran province. Kraft method was used for pulping the condition of which were 25% sulfidity, 14% alkali, 5:1 the ratio of liquor to sample, maximum cooking temperature as 155, 165, 175 degree centigrade. Kappa number and the yields of pulps were estimated and residual lignin was calculated for each sample. Using the models predicted for rate equation and trial and error method in excell software, the order and rate constant of delignification reaction were evaluated for each cooking temperature. The results show that the rate equations of delignification reaction of Populus deltoides in temperatures of 155°C, 165°C and 175°C have the orders of 5.5, 2.5 , 1 and the rate constants of 1.8× 10-7 min.-1 conc.-4.5, 7.7× 10-4 min.-1 conc.-1.5 and 3.5× 10-3 min.-1 , respectively. Using these equations it will be possible to control the pulping process and predict the time required to obtain a desired lignin concentration in the pulp.http://ijwpr.areeo.ac.ir/article_107119_9263ce63bffb1fccac8735792d4d6244.pdfPOPULUS DELTOIDESpaper pulpdelignificationreaction rate |
| spellingShingle | Mohammad Mahdi Barazandeh Saeid Mahdavi Abbas Fakhryan Evaluating the Rate Equation of Delignification Reaction of Populus deltoides تحقیقات علوم چوب و کاغذ ایران POPULUS DELTOIDES paper pulp delignification reaction rate |
| title | Evaluating the Rate Equation of Delignification Reaction of Populus deltoides |
| title_full | Evaluating the Rate Equation of Delignification Reaction of Populus deltoides |
| title_fullStr | Evaluating the Rate Equation of Delignification Reaction of Populus deltoides |
| title_full_unstemmed | Evaluating the Rate Equation of Delignification Reaction of Populus deltoides |
| title_short | Evaluating the Rate Equation of Delignification Reaction of Populus deltoides |
| title_sort | evaluating the rate equation of delignification reaction of populus deltoides |
| topic | POPULUS DELTOIDES paper pulp delignification reaction rate |
| url | http://ijwpr.areeo.ac.ir/article_107119_9263ce63bffb1fccac8735792d4d6244.pdf |
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