ClO2 bleaching method of bagasse pulp

Abstract

The invention relates to a clO2 bleaching method of bagasse pulp, which indicates 1) preparing the ponderance concentration of the bagasse fundamental colour pulp as 10%, and then getting d>=[0]albefaction pulp by mixing the aforementioned fundamental colour pulp with clo2 containing available chlorine of 2.5%-3.5% of the fundamental colour pulp by weight. 2) preparing the ponderance concentration of the aforementionedd>=[0]albefaction pulp as 10% after washing it, then gettinge>=[p]extraction pulp by addingh>=[2]o>=[2]which is 0.3%-0.5% of the fundamental colour pulp by weight and NaOH which is 1.5%-2.5% of the fundamental colour pulp by weight and carrying them into intensification alkalis reaction. 3) preparing the ponderance concentration of the aforementioned E>=[P]albefaction pulp as 10% after washing it, and then getting d>=[1]albefaction pulp by mixing the aforementioned fundamental colour pulp with clo2 containing available chlorine of 1.0%-1.5% of the fundamental colour pulp by weight. 4) In the end getting the high white content albefaction pulp with white content of 81%-87% ISO and yield rate of 90%-92% by diluting the aforementionedd>=[1]albefaction pulp and washing it.

Description

technical field [0001] The invention belongs to the technical field of pulp bleaching, in particular to a chlorine dioxide bleaching method for bagasse pulp. technical background [0002] Chlorine dioxide is a strong oxidizing agent. Stable chlorine dioxide has been considered by the World Health Organization as a fungicide with good effect and a bactericidal disinfectant with excellent performance, and it is also a good paper bleaching agent. The use of chlorine dioxide in pulp bleaching has the characteristics of high brightness, stable brightness, strength retention, low color drainage and low toxicity. Its unique advantages are unmatched by any other chemicals so far. In view of the superiority of chlorine dioxide bleaching and the high toxicity of chlorine bleaching, the National Development and Reform Commission has recommended chlorine dioxide as one of the chemicals for pulp bleaching, and phased out the chlorine bleaching process. [0003] At present, in southern m...

AI Technical Summary

Problems solved by technology

[0003] At present, in southern my country, the rich bagasse resources are used to produce bleached pulp, mainly using chlorination-alkali treatment-??? hypochlorite (CEH) three-stage bleaching method, using (CEH) bleaching method, the yield of bleached pulp is low , generally 82 to 85%, and the bleaching wastewater contains a large amount of organic chloride, which greatly pollutes the environment