Oxycellulose from Flax Fibers
Keywords:Flax fiber, TEMPO, Oxidation process, Oxycellulose, Carboxyl group
Objective. Development of technologies for obtaining products from natural sources of raw materials, which after the end of its life cycle is subject to biodegradation, as an alternative to products from exhaustive sources of raw materials – oil, coal, gas.
Objective. The aim of the paper is production of pulp from flax fibers by an ecologically safe method of delignification using peracetic acid solution and determining the influence of the main technological parameters of the cellulose oxidation process under the action of the TEMPO oxidant (2,2,6,6-tetramethyl-piperidine-1-oxyl) on the quality of oxycellulose.
Methods. In the first stage of flax fiber processing, extraction was carried out with a solution of sodium hydroxide at a concentration of 7%, a liquid-to-solid ratio of 10: 1, lasting from 1 to 4 hours at a temperature of 95 ± 3 °C. In the second stage, pulping with a solution of peracetic acid at a temperature of 95 ± 3 °C, for 4 hours was carried out. The process of cellulose oxidation from flax fibers was carried out with a solution of TEMPO at a consumption of 1.5; 3.0; 5,0 and 10,0% by weight of absolutely dry raw materials at a temperature of 20, 40 and 60 °С and duration from 2 to 6 hours.
Results. The chemical composition of flax fibers is given. The organosolvent pulp from flax fibers with a residual lignin content of 0.34% and an ash content of 0.03% was obtained, which was used for the TEMPO oxidation process. It is shown that an increase in the consumption of TEMPO oxidizer, duration and temperature of the oxidation process contribute to an increase in the content of carboxyl groups in the obtained oxycellulose samples from flax organosolvent pulp. It was established that by carrying out the process of oxidation of linseed cellulose at a TEMPO consumption of 5% of the mass of absolutely dry raw material, at a temperature of 60 °C and a duration of 6 hours, oxycellulose from a carboxyl group content of up to 5.3% was obtained.Conclusions. Obtained oxycellulose can be used in surgical practice as one of the components of non-toxic radioprotective, hemostatic, antimicrobial and wound healing materials.
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