Plural stage mixing and thickening oxygen reacting

Details Plural stage mixing and thickening oxygen reacting Plural stage mixing and thickening oxygen reacting

D - Textiles, Paper

21

C

92/60.1

D21C 9/10 (2006.01)

Patent

CA 1088361

ABSTRACT OF THE DISCLOSURE A method and apparatus for the treatment of fiber material by oxygen bleaching. Digested cellulosic fiber material is treated with oxygen to reduce the Kappa number thereof further to about 15 or below. The reaction products are removed immediately after formation, and during the oxy- gen bleaching process. The fiber material is at a first consistency of about 8 to 15% consistency, and treatment with oxygen is accomplished by mixing the pulp with O2, NaOH solution, and water to thereby form an integral mixture of pulp with oxygen at a second consistency, thickening the integral mixture to return it to generally its first consis- tency, and repeating the mixing and thickening until pulp of a desired Kappa number (15 or below) is reached. The pulp is then washed and may be subsequently treated to reduce the Kappa number thereof to any desired value. A thickener is used which can thicken pulp at superatmospheric pressures and at a temperature greater than 100°C.

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