Hydrogen peroxide stabilizer composition in paper pulp bleaching

Abstract

A hydrogen peroxide stabilizer composition in paper pulp bleaching contains the following materials by the weight percentages: ethylenediaminetetraacetic acid 8%-10%, polyacrylic acid 3%-5%, nitrilortiacetic acid 5%-10%, hydroxy ethylidene-1, 1-diphosphonic acid 5%-8%, sodium hydroxide in suitable amount and the rest of deionized water,. The preparation method includes: mixing the materials in the material ratio, adjusting the pH value to 6.8-7.1 with the sodium hydroxide and adding the deionized water to 100%. The inventive hydrogen peroxide stabilizer composition in the paper pulp bleaching can reduce the decomposition rate of the hydrogen peroxide to less than 20%, prevent the fouling from generating and dispersing pulp fibers and chelating metal ions.

Description

technical field [0001] The invention relates to a hydrogen peroxide stabilizer composition in pulp bleaching. Background technique [0002] In the process of pulp bleaching, compared with the method of chlorine bleaching, the use of hydrogen peroxide bleaching has the advantages of strong adaptability, whiteness stability and higher whiteness of bleached pulp. During the bleaching process, hydrogen peroxide can eliminate the carbonyl and phenolic hydroxyl groups on the side chains of some lignin macromolecules, destroy or reduce the chromophoric groups, thereby effectively improving the whiteness of pulp, and because the by-products after hydrogen peroxide bleaching are all It is an oxide, and the wastewater does not contain chloride ions, which reduces toxicity and pollution, and has important practical significance in environmental protection. However, when bleaching with hydrogen peroxide, heavy metal ions such as iron and manganese in the pulp will accelerate the decomp...

AI Technical Summary

Problems solved by technology

However, when bleaching with hydrogen peroxide, heavy metal ions such as iron and manganese in the pulp will accelerate the decomposition of hydrogen peroxide, reduce hydrogen peroxide ions, and reduce the bleaching effect.