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Method for promoting removal rate, whiteness and viscosity of oxygen delignification by STPP

A technology of sodium tripolyphosphate and oxygen delignification, applied in the direction of adding inorganic compounds, etc., to reduce environmental pollution, improve lignin removal rate, and reduce dosage

Inactive Publication Date: 2010-11-03
FUJIAN AGRI & FORESTRY UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0014]The purpose of this study is to solve the problem that oxygen bleaching is worse than traditional chlorine-containing bleaching agent in delignification effect, and the bleaching pulp has lower brightness and lower viscosity , trying to find effective oxygen bleaching auxiliaries to promote delignification in the oxygen bleaching process, thereby improving the whiteness and viscosity of bleached pulp

Method used

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  • Method for promoting removal rate, whiteness and viscosity of oxygen delignification by STPP
  • Method for promoting removal rate, whiteness and viscosity of oxygen delignification by STPP
  • Method for promoting removal rate, whiteness and viscosity of oxygen delignification by STPP

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Embodiment 1

[0037] Effects of different protective agents on the effect of oxygen delignification

[0038] In order to find a suitable protective agent to replace MgSO4, 8 different protective agents were selected for research. The oxygen delignification process steps and process conditions are as follows: Unbleached sulfate bamboo pulp with a pulp concentration of 10% is fed with oxygen pressure Oxygen at 0.5 MPa, add NaOH so that the amount of NaOH accounts for 2.5% (for absolute dry pulp), add a protective agent, the type and amount of the added protective agent are shown in Table 2 below, at a temperature of 100 ° C, the reaction time is 60 minutes, wash with water Remove the residue, and the measured results are shown in Table 2. The pulp of this example selects unbleached sulfate bamboo pulp for use, is taken from the product produced by Shaowu Zhongzhu Paper Industry.

[0039] Table 2 Effects of different protective agents on the effect of oxygen delignification

[0040]

[00...

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Abstract

The present invention discloses an application of sodium tripolyph-osphate as protecting auxiliary in the oxygen delignification bleaching, and by weight percentage, the dosage of the sodium tripolyph-osphate of the protecting auxiliary is 0.1 percent to 0.5 percent. Compared with the prior universal protecting auxiliaries, such as bitter salt, the kappa value of the sodium tripolyph-osphate applied as the protecting auxiliary of oxygen delignification is low, that is, the delignification rate is high, exceeding 50 percent, while whiteness and viscosity are the highest, so the sodium tripolyph-osphate applied by the present invention, the protecting auxiliary of oxygen delignification, has the better effect than the bitter salt used as the protecting auxiliary of oxygen delignification, and while the sodium tripolyph-osphate protects carbohydrate, lignin is removed as much as possible. The environmental pollution is reduced. Using sodium tripolyph-osphate as the protecting auxiliary of oxygen delignification can increase the delignification rate, thus reducing the subsequent dosage of bleaching chemicals and therefore also reducing the pollution load of bleaching wastewater.

Description

Technical field: [0001] The invention relates to an oxygen delignification protection aid, in particular to a method for improving the removal rate, whiteness and viscosity of oxygen delignification by using sodium tripolyphosphate. Background technique: [0002] The most serious source of pollution in pulp and paper mills is chlorine bleaching effluent. In the past, the seriousness of this kind of waste liquid pollution was not well understood, but it has been paid attention to by scientists in recent years. In my country, many paper mills use non-wood pulp to make paper, such as: bamboo pulp, wheat straw pulp, straw pulp or reed pulp. Non-wood pulping papermaking waste liquor - black liquor, is basically treated through the combustion alkali recovery process, but the pulp bleaching section uses chlorine and chloride as the main bleaching agent to bleach pulp, these chlorine and chlorine bleaching agents The pulp fiber is damaged, the yield of the pulp and the strength o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D21H17/66D21C9/153
Inventor 黄六莲陈礼辉
Owner FUJIAN AGRI & FORESTRY UNIV
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