The Comparison of Kinetics of Microwave-Assisted Extraction of Bast and Birch Bark

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UDС

66.061.4

DOI:

10.17238/issn0536-1036.2017.3.164

Abstract

The overview of birch bark is presented. Kinetics of the microwave extraction process of birch bark and bast are studied. For the experiments we use wood bark residual of the plywood production manually divided into bast and bark. The extraction is carried out in a microwave chamber under the earlier determined optimal conditions. The following parameters are calculated to investigate the dependence of the degree of extraction of extractives on the duration of bast extraction: the concentration of extractives in solids, the degree of insufficient extraction, obtained by the calculated and experimental methods. Similar indicators are determined for birch bark (combined processing of birch bark and bast without prior separation) for fractions of less than 1 mm, 1...2 mm, 2...3 mm. The characteristic form of the logarithmic dependence of the concentration simplex of extractives on the duration of extraction for the fractions of bast and birch bark is obtained. Dependences of the degree of insufficient extraction on the duration of extraction for fractions of bast and birch bark are presented. A regular mode and linear relationship are observed even after the first minute of microwave extraction for bast and for birch bark. When studying the dependences of the degree of insufficient extraction on the duration of extraction for different factions of bast and birch bark we observe a maximum value of this index in the initial phase of the microwave extraction, and towards the end of the process – its reduction. With a decrease in the bast fraction, the degree of insufficient extraction is less; with a decrease in the fraction of birch bark the degree of insufficient extraction is greater. For birch bark the extraction process lasts for about 600 s, and for bast it lasts for a considerable time. By the time the extraction is completed, the degree of insufficient extractives from bast is several times greater than from birch bark. The greatest value of the internal diffusion coefficient in bast is observed for the fraction of less than 1 mm, and the least – for the fraction of 2…3 mm; the greatest value in birch bark is observed for the fraction of 2…3 mm, and the least – for the
fraction of less than 1 mm.

Authors

A.I. Badogina, Postgraduate Student S.I. Tret’yakov, Candidate of Engineering Sciences, Professor N.A. Kutakova, Candidate of Engineering Sciences, Professor E.N. Koptelova, Candidate of Engineering Sciences, Associate Professor

Affiliation

Northern (Arctic) Federal University named after M.V. Lomonosov, Naberezhnaya Severnoy Dviny, 17, Arkhangelsk, 163002, Russian Federation; e-mail: a.badogina@narfu.ru

Keywords

bast, bark, extractives, microwave extraction.

For citation

Badogina A.I., Tret’yakov S.I., Kutakova N.A., Koptelova E.N. The Comparison of Kinetics of Microwave-Assisted Extraction of Bast and Birch Bark. Lesnoy zhurnal [Forestry journal], 2017, no. 3, pp. 164–175. 10.17238/issn0536-1036.2017.3.164

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