| 摘要 |
Chemical cellulose is produced by treatment in a digester. In the first step, wood in the form of chips is treated for a period of about from 15 to 90 minutes with a cooking acid of a calculated amount of below 5% by weight and at least 2.5% by weight of SO2 and a mole ratio of SO2 to MgO or CaO of from about 2 : 1 to 3.5 : 1 at a temperature of from about 45 to 90 DEG C. The liquid SO2 is fed into the digester until the total SO2 content of the cooking acid is from about 6 to 10 percent by weight, and completing the digestion in a second step to obtain a pulp by cooking at a temperature of above 110 DEG C., and working up the pulp in a manner known per se to obtain chemical cellulose. |
