Перевод названия: Kinetics of Fir Wood Oxidation by Oxygen in Aqueous Alkaline Media
Тип публикации: статья из журнала
Год издания: 2016
Ключевые слова: Wood chemistry, kinetics, fir, Abies sibirica, oxidation, oxygen delignification, Wood extractives
Аннотация: 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 branchingПоказать полностьюmode 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.
Журнал: Химия растительного сырья
Выпуск журнала: № 4
Номера страниц: 57-63
ISSN журнала: 10295151
Место издания: Барнаул
Издатель: федеральное государственное бюджетное образовательное учреждение высшего образования "Алтайский государственный университет"