EXTRACTING SUBERIN ACIDS FROM BIRCH BARK WHEN EXPOSED TO A MICROWAVE FIELD
Abstract
The present study focuses on the identification of the components included in the suberin of birch bark, as well as the development of the method of intensification of hydrolysis of birch bark in the allocation of suberin.
Identification suberin derived from the technical of birch bark in conditions the microwave field was conducted the method of IR-spectroscopy (IRS). In the study of the chemical composition of suberin acids using gas chromatomass spectrometry (GC/MS) revealed the following dominant acid: docosanedioic (phellogenic) acid and 22-hydroxydocosanoic (phellonic) acid.
It is established that processing of birch bark in a microwave field allows 2 times to reduce the duration of process of water-alkaline hydrolysis. By the planned experiment, mathematical description of the process of hydrolysis of birch bark in conditions of microwave radiation was obtained; the influence of the main parameters was installed and the optimal conditions for suberin acids secretion were determined. Concentration of alkali, %; power, W; duration, min were selected How were the independent variables. It is noted that the increase in alkali concentration and duration of hydrolysis leads to a positive result. On the basis of economic considerations, the optimum concentration of KOH for microwave hydrolysis is 5%, duration – 15 min, power – 600 W. The power consumption is 37,5 kWh/kg birch bark.Downloads
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