Extractives Isolation Procedure from Birchbark Bast on Exposure to the Microwave Field

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Abstract

The paper investigates the effect of alkali consumption and ethyl alcohol concentration during the microwave extraction from birchbark bast. The bast obtained by separation from the technical bark was used. Bast was chosen due to the number of substances exposed to the hot water extraction as distinct from birchbark. This birchbark is a waste of raw material barking. Experiments were performed with the use of the microwave chamber, since the use of a microwave field allows effectively to carry out the extraction process and to reduce its duration. The independent selected parameters were the next: ethyl alcohol concentration, alkali consumption (KOH), liquid module. The output data are: extractives yield and a period of extracted bast filtration. The influence of the basic parameters of the process of microwave extraction of birchbark is studied. In the course of the experiments it was found that ethyl alcohol concentration and alkali consumption have a significant effect on the yield of extractives. The output of extractives can be speeded by reducing the ethyl alcohol concentration and increasing alkali consumption and it culminates with increasing liquid module. The yield of extractives increases if KOH consumption increases of from 10 to 30 %; it decreases if ethyl alcohol concentration increases from 10 to 30 %; it culminates if liquid module increases from 10:1 to 20:1. The dependence of the filtration period of ethyl alcohol concentration, KOH consumption and a liquid module was determined. The period of filtration decreases by increasing ethyl alcohol concentration and it decreases as the liquid module is decrease. The optimal parameters of microwave extraction process concerning the yield of extractives and filtration period are established. These parameters are required to attain the maximum output value based on the minimum time duration of a period of filtration. The kinetics of the extraction process with the use of microwave chamber. The microwave extraction increases the seed of the process speed and output of extractives as distinct from the by infusion. The period of the output, corresponding to the content of extractives in the feedstock is defined.

Authors

• A.I. Zakharova, postgraduate student
• S.I. Tret’yakov, candidate of Engineering, Professor
• N.A. Kutakova, candidate of Engineering, Professor
• E.N. Koptelova, candidate of Engineering, Teaching Assistant
  
  Northern (Arctic) Federal University named after M.V. Lomonosov,
  Naberezhnaya Severnoy Dviny, 17, Arkhangelsk, 163002, Russia;
  e-mail: allenza@yandex.ru

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References

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