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- W2183654204 abstract "1. Summary The kappa number of unbleached eucalyptus kraft pulp is decreased with a hot acid hydrolysis stage by approximately 20%. This results in a lower demand for chlorine dioxide. The savings are not substantial enough to justify an investment into an additional tower and a washing filter. Additional changes in the bleaching sequence are necessary to obtain an optimized effect. Acid hydrolysis allows to reconfigure a bleach plant to ECF bleaching in mills with limited chlorine dioxide capacity without large rebuilt. It is necessary to modify the bleaching stages by changing a DEopDED sequence to AOpDEpD. Instead of the investment into an oxygen stage the alternative could be the addition of an acid hydrolysis stage and the application of the sequence AOpDEpDP. The effluent load of such a sequence and the yield are identical to a conventional sequence with the stages ODEopDD. For mills with an existing oxygen stage the effect of acid hydrolysis is too limited to allow a cost effective implementation. The only option to use the hydrolysis effect seems to be to run the existing D0 stage at a very high temperature (90°C). This decreases the demand for chlorine dioxide." @default.
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- W2183654204 date "1998-01-01" @default.
- W2183654204 modified "2023-09-27" @default.
- W2183654204 title "Chemicals demand in ECF bleaching of eucalyptus pulp with extended prebleaching" @default.
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