THE INFLUENCE OF PREHYDROLYSIS GRINDING OF FIBROUS MASS ON THE QUALITATIVE CHARACTERISTICS OF MICROCRYSTALLINE CELLULOSE
UDC 676.16.024.61
Abstract
The positive effect of pre-hydrolysis grinding of fibrous mass on the quality parameters of microcrystalline cellulose samples is shown. A comparative study of the properties of MCC from secondary lignocellulosic materials was conducted using wheat straw and bleached sulfate hardwood pulp as examples. The study of MCC samples from unmilled fibrous mass (grinding degree 15 °SR) and obtained with pre-hydrolysis grinding to a grinding degree of 85 °SR showed that the degree of polymerization decreases by 25%, the degree of crystallinity increases by 10±1%, and the bulk density by 25%. The lignin content decreases due to pre-hydrolysis grinding in samples from wheat straw by 40%, and from BSLC by 10%, which can be explained by the different structure of the fibers. When analyzing the quality characteristics of MCC samples obtained from bleached sulfate hardwood pulp and wheat straw, it was found that the use of secondary lignocellulose materials in the production of MCC is an economically and technologically justified solution. The use of alternative raw materials allows for a 1.5-fold reduction in production costs for the production of MCC and helps reduce the environmental impact.
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