Technology for the production of microcrystalline cellulose with prehydrolysis grinding on the example of samples of bio-damaged coniferous wood

The possibility of obtaining microcrystalline cellulose using prehydrolysis grinding is shown on the example of samples of dry-resistant coniferous wood. Cellulose from the bio-damaged wood was isolated with a cooking solution, the main components of which were sodium hydroxide and sulfide (NaOH and Na2S). Cooking was carried out in a laboratory autoclave at a maximum temperature of 170 ° C for 3 hours, the liquid module was 4.8, the degree of sulfidity of the cooking solution was 18%. To increase the content of alpha-cellulose in cellulose, two-stage bleaching and refining were carried out. The grinding of the fibrous mass took place on an experimental knife-less installation of the “jet–barrier” type (grinding conditions: the concentration of the fibrous mass was 1 %, the degree of grinding varied from 15 to 85). The chemical composition of the fibrous mass after grinding has been determined. Chemical treatment of cellulose samples with different degrees of grinding was carried out at the following parameters: hydrolysis temperature from 80 to 100 °C, hydrochloric acid concentration from 54.75 to 91.25 g/l, hydrolytic degradation time from 60 to 120 min. The nature of the change in the degree of polymerization of microcrystalline cellulose depending on the de-gree of grinding is analyzed. It was found that with an increase in the degree of grinding of the fibrous mass from 15 to 85 °C, the crystallinity index of MCC varies from 0.64 to 0.78; the degree of polymerization from 350 to 95. A linear regression equation has been obtained to determine the effect of technological parameters on the degree of polymerization. It was found out that the degree of polymerization of microcrystalline cellulose is decisively influenced by the degree of Shopper–Riegler grinding. The developed technology for producing microcrystalline cellulose makes it possible to solve the problem of recycling of bio-damaged wood and reduce the cost of obtaining MCC by 1.5 times.

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