초록 ▼

A process for washing a cellulose pulp from alkali digestion, wherein the pulp is fed into a multistage washing system comprising several countercurrently coupled washers, acid is added to a washing solution, the acidified fiber suspension is fed further to the following stage wherein the acidified

A process for washing a cellulose pulp from alkali digestion, wherein the pulp is fed into a multistage washing system comprising several countercurrently coupled washers, acid is added to a washing solution, the acidified fiber suspension is fed further to the following stage wherein the acidified solution is replaced in the fiber suspension by washing water, and the filtrate obtained from this stage is used after acidification at least partially as a washing solution at the previous stage. The acid is added at a stage when the concentration of the dissolved organic substances is at a value that detrimental precipitation of the organic substances is prevented.

대표청구항 ▼

A process for washing a cellulose pulp from alkali digestion, prior to the bleaching stage wherein the pulp is fed into a multistage washing system comprising at least three countercurrently coupled washers/in sequence, acid is added directly to a washing solution thus lowering the pH of said soluti

A process for washing a cellulose pulp from alkali digestion, prior to the bleaching stage wherein the pulp is fed into a multistage washing system comprising at least three countercurrently coupled washers/in sequence, acid is added directly to a washing solution thus lowering the pH of said solution to a value of 3 or lower at a stage immediately preceding the last washing stage when the concentration of dissolved organic substances is at a value that detrimental precipitation of the organic substances is prevented, the acidified fiber suspension is fed further to the last stage wherein the acidified solution is displaced from the fiber suspension by washing water, and the solution obtained form the last stage is used at least partially as a washing solution at the said stage immediately preceding the last stage.