A novel ozone bleaching technology for the ALCELL process
1996
Ni, Y. | Van Heiningen, A.R.P. | Lora, J. | Magdzinski, L. | Pye, E.K.
The ALCELL process is an ethanol-based autocatalyzed solvent pulping technology which is being developed by Repap Enterprises Inc. The paper will present a nova ozone bleaching process (Zn), which is compatible with the present ALCELL technology. It is based on that an acidified ethanol-water mixture is used as the pulp impregnation liquor during ozone bleaching. It was found that the presence of ethanol dramatically reduces that carbohydrate degradation while delignification is not affected. Process parameters in the Zn stage, including the ethanol concentration and pH, on the delignification efficiency and carbohydrate degradation were studied. The underlying mechanism of this novel bleaching technology will also be discussed.
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