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Chemistry for Sustainable Development

2008 year, number 5

Intensification of Sawdust Powdering Process

O. V. Golyazimova, A. A. Politov
Keywords: sawdust powdering, wood flour, intensification, preliminary chemical treatment
Pages: 589-592


The effect of the preliminary chemical treatment on the process of mechanical powdering of the raw material is investigated. It is shown that the treatment of sawdust with the solutions of an acid, an alkaline or with enzymatic preparations results in the chemical modification of one of the components of the lignocarbohydrate matrix of sawdust (cellulose, hemicelluloses or lignins) and in the changes of the structure of wood. The effect of enzymatic hydrolysis on conversion degree and efficiency of powdering is investigated. It is shown that even a small degree of carbohydrate conversion (1-2 %) is sufficient for a decrease in the strength of wood structure by means of the enzymatic destruction of carbohydrates. The fraction of particles with a size within the range 19-25 Ојm increases approximately by a factor of 10 with the help of the method of preliminary chemical treatment of sawdust.