Bleaching method for preparing high quality low pollution bamboo wood dissolving slurry

Abstract

The invention relates to a bleaching method for preparing a high quality low pollution bamboo wood dissolving slurry, which comprises the following steps: 1) removing parenchyma cells, employing a sieve method or a slurry washing method for removing parenchyma cells; 2) performing an oxidation reaction to remove a transition metal compound, removing boiled residual lignin in the unbleached slurry, performing ozone bleaching on washed slurry; 3) refining alkali in a reinforced mode; 4) bleaching chlorine dioxide; and 5) processing by acidifying at high temperature. According to the invention, delignification step by step, dynamic viscosity adjusting, whiteness enhancement, fine fiber generation reduction, and reaction capability activation are carried out on unbleached bamboo wood dissolving slurry, on the basis of increasing fiber strength, whiteness and filtering quality, the pollution load of the bleaching waste water is reduced, the bamboo wood dissolving slurry with high product quality and low environmental pollution is prepared, and provides a high quality raw material for producing the viscose fiber.

Description

technical field [0001] The invention relates to a bleaching method of high-quality and low-pollution bamboo dissolving pulp that can improve the reaction performance and strength of the dissolving pulp, improve the filtration performance and reduce environmental pollution, especially relates to a method of using bamboo as raw material to remove miscellaneous cells→ Oxidation reaction→intensified alkali refining→chlorine dioxide bleaching→high temperature acidification treatment to prepare a bleaching method for preparing high-quality and low-pollution bamboo dissolving pulp with good reaction ability, high filtration performance and less environmental pollution, which belongs to the fiber pulp manufacturing technology field. Background technique [0002] The traditional non-cotton cellulose dissolving pulp bleaching method mainly adopts the CEH three-stage bleaching method with high chlorine content, namely chlorination (C), alkalization (E), and hypochlorite (H) bleaching. ...

AI Technical Summary

Problems solved by technology

[0005] If the conventional CEH bleaching is still used, in order to achieve the purpose of improving the pulp whiteness and continuing to remove residual lignin, the only option is to use strong chlorine for oxidation treatment , the result is that the fiber strength drops sharply, the dispersion range of dynamic viscosity expands, and the uniformity cannot be guaranteed; the reaction performance and filtration performance deteriorate

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