| Popis: |
The process of the formation of peracetic acid by acylation of hydro- gen peroxide with acetic acid with various catalysts - sulfuric acid, titanium and silicon dioxides, kaolin has been studied. The aqueous solution of the reagents was heated at a constant temperature of 60°C for 4.5 hours and analyzed for the content of residual hydrogen peroxide and formed peracetic acid. Silicon dioxide did not affect the results of the process. In the presence of titanium dioxide, an intense decomposition of hydrogen peroxide was observed. The highest concen- tration of peracetic acid, 0.81 g-mol/dm3, was obtained using sulfuric acid as a catalyst. With this solution, cooking (oxidative delignification) of wheat straw was performed for 130 minutes at 90°C. Technical cellulose was obtained with a yield of 57.4% and a mass fraction of lignin of 6.8%, whose properties are comparable to sulfate cellulose from hardwood. |
