CELLULOSE FROM THE SUNFLOWER STALKS
UDC 676.166
Abstract
The stalks of the sunflower (helianthus annuus) are stored up in the south Krasnoyrsk of the edge. The external layer and the pith (parenchyma fibers) was separated by hand. High degree of the stalks nonhomogeneitys was installed: coefficient of variation of the external layer mass part to be taken before 8%, pith – before 65%. The air-dry external layer reduced in laboratory desintegrator (beater mill), the material separated in the form particles length 10–20 mms, delignificated with the peroxide hydrogen and acetic acid water solution under liquid module 6 and temperature 93 °C. In the course of experiment varied the initial concentrations peroxide (the range of variation 3.5–4.5 g-mol/l) and acid (3–5 g-mol/l), length of the isothermal cooking (3–5 hours). The dependencies of the total leaving the hard remainder, noncooked and consumed peroxide hydrogen parts from the variable factor approximated with the second order equations of the regression. The equations used for graphic presentation result. The analyses dependencies correspond to a priori information. With growing of the value of each factor grows the part consumed peroxide hydrogen, decreases total leaving the hard remainder and noncooked. When leaving 40% and degree of the grind 30 °SR cellulose had a breakup length 7300 m, forcing through resistance 225 kPа, tearing – 230 mN
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