| 摘要 |
A method is described for bleaching cellulose and producing cellulose derivatives comprising the sequence AHTDP, which includes a first cellulose pulp bleaching stage called acid hydrolysis (AHT), during which one part cellulose pulp is mixed with nine parts acid reagents for about 2 hours at a temperature of 98°C and a pH of 3.0; a second stage of the brightening method (D), during which one part cellulose pulp is mixed with nine parts of a solution containing chlorine dioxide and sodium hydroxide, kept at a temperature of 70°C for about 2 hours, with a pH from 5.0 to 5.5; and a third stage of the brightening method (P), during which one part cellulose pulp is mixed with nine parts of a solution containing hydrogen peroxide and sodium hydroxide, at a temperature of 98°C for about 2 hours, the pH being kept between 10.5 and 11.0. |
