KINETICS OF FIR WOOD OXIDATION BY OXYGEN IN AQUEOUS ALKALINE MEDIA
Abstract
Kinetics of fir wood oxidation (Abies sibirica) in aqueous alkaline media were studied by measuring oxygen consumption rates. Oxidation of extracted wood conforms to the kinetics of non-branching chain mechanism. The same mechanism governs the initial stage of non-extracted wood oxidation, but a transition to degenerate branching mode soon occurs. This transition is probably caused by softwood's low hemicelluloses content and high content of propyl guaiacol lignin units that are prone to condensation involving phenolic hydroxyls. This leads to quick depletion of phenolic and uronic carboxylic groups; chain initiation by oxidizing the respective anions becomes impossible, and degenerate branching takes the lead. It is assumed that inert hydrophobic fir extractives physically shield hydroperoxides responsible for degenerate branching from alkali. This prevents alkali from causing heterolytic hydroperoxide cleavage that does result in chain branching. It is assumed that the catalyst accelerates the reaction of homolytic cleavage of the aforementioned hydroperoxides
Downloads
Metrics
References
Hermer E.I. Izvestia vuzov. Lesnoy zhurnal, 2006, no. 6, pp. 94–102. (in Russ.).
Tarabanko V.E., Kaygorodov K.L., Skiba E.A., Tarabanko N., Chelbina Yu.V., Baybakova O.V., Kuznetsov B.N., Djakovitch L. Journal of Wood Chemistry and Technology. 2016.. Published online 02 Nov. 2016. Pp. 1-9. DOI 10.1080/02773813.2016.1235583.
Wong Z.J., Chen K.F., Li J. Bioresources, 2010, vol. 5, no. 3, p. 1509-1516.
Deyneko I.P., Slonim V.Z., Nikolsky S.N., Zarubin N.Ya. Khimia drevesiny, 1983, no. 5, pp. 25-31. (in Russ.).
Knill C.J., Kennedy J.F. Carbohydrate Polymers, 2003, vol. 51, no. 3, pp. 281–300.
Tarabanko V.E., Pervishina E.P., Hendogina Yu.V. Reaction Kinetics and Catalysis Letters, 2001, vol. 72, no. 1, pp. 153–162.
Tarabanko V.E., Koropatchinskaya N.V., Kudryashev A.V., Kuznetsov B.N. Russian Chemical Bulletin, 1995, vol. 44, no. 2, pp. 367–371.
Fengel D., Wegener G. Wood. Chemistry, Infrastructure, Reactions. Walter de Gruyter Berlin; New York, 1984, 613 p.
Solvent extractives of wood and pulp. TAPPI standard test method T 204 cm 97. 1997. 4 p.
Tarabanko V.E., Fomova N.A., Kuznetsov B.N., Kudryashev A.V., Ivanchenko N.M. Reaction Kinetics and Catalysis Letters, 1995, vol. 55, no. 1, pp. 161–170.
Sharkov V.I., Kuybina N.I. Khimia gemitselluloz. [Chemistry of hemicelluloses]. Moscow, 1972. 440 p. (in Russ.).
Hermer E.I., Butko Yu.G. Khimia drevesiny,. 1983, no. 5, pp. 32–37. (in Russ.).
Denisov E.T. Konstanty skorosti gomoliticheskikh zhidkofaznykh reaktsii. [The rate constants of homolytic liquid phase reactions]. Moscow, 1971, p. 51. (in Russ.).
Skibida I.P., Sakharov A.M., Emanuel O.N. Itogi nauki i tekhniki, seria "Kinetika i kataliz", 1986, vol. 15, pp. 110–244. (in Russ.).
Hermer E.I. Khimia drevesiny, 1992, no. 4, pp. 46–55. (in Russ.).
Denisov E.T. Kinetika gomogennykh khimicheskikh reaktsii [Kinetics of homogeneous chemical reactions]. Moscow, 1988. 391 p. (in Russ.).
Tarabanko V.E., Pervishina E.P., Nevkritova T.A., Pen R.Z. Khimia rastitelnogo syr’ya, 1999, no. 4, pp. 53–59. (in Russ.).
Tarabanko V.E., Petukhov D.V., Selyutin G.E. Kinetics and Catalysis, 2004, vol. 45, no. 4, pp. 569–577.
![](http://journal.asu.ru/public/journals/1/cover_article_1582_en_US.jpg)
This work is licensed under a Creative Commons Attribution 4.0 International License.
The authors, which are published in this journal, agree to the following conditions:
1. Authors retain the copyright to the work and transfer to the journal the right of the first publication along with the work, at the same time licensing it under the terms of the Creative Commons Attribution License, which allows others to distribute this work with the obligatory indication of the authorship of this work and a link to the original publication in this journal .
2. The authors retain the right to enter into separate, additional contractual agreements for the non-exclusive distribution of the version of the work published by this journal (for example, to place it in the university depository or to publish it in a book), with reference to the original publication in this journal.
3. Authors are allowed to post their work on the Internet (for example, in a university repository or on their personal website) before and during the review process of this journal, as this may lead to a productive discussion, as well as more links to this published work.