FRACTIONATION OF PINE BARK TO OBTAIN AN ANTHOCYANIDINS AND POWDERED CELLULOSE
UDC 676.1.022.6.001.5; 676.014
Abstract
A new method for fractionating pine bark to obtain anthocyanidins and powdered cellulose was proposed. Anthocyanidins were isolated from pine bark by treatment with a solution of hydrochloric acid in ethanol with a yield of 10.1 wt.%. The presence of cyanidin and delphinidin in the composition of anthocyanidins was confirmed by UV spectroscopy method. Experimental and mathematical optimization of the process of peroxide catalytic delignification of pine bark after anthocyanidin extraction was carried out. Delignification process was carried out in the presence of MnSO4 catalyst at a hydromodulus of 20, a temperature of 100 °C and a duration of 4 hours. Using the method of mathematical optimization of the delignification process, optimal conditions for obtaining powdered cellulose from pine bark were established: the concentration of H2O2 6.4 wt.% and CH3COOH 57.1 wt.%. The experimental yield of cellulose product under optimal conditions was 34.1 wt.%, and the content of lignin in it was 1.1 wt.%, cellulose 86.4 wt.%. The crystallinity index of cellulose product was 0.81, the average particle size was 2.74 μm. The characteristics of powdered cellulose were determined by elemental and chemical analysis, FTIR, XRD, SEM, EDS and laser diffraction methods.
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