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Technology for catalyzing and bleaching paper pulp with immobilized Schiff alkali metals

A technology of metal catalysis and Schiff base, applied in the field of papermaking, can solve the problems of high requirements for reaction equipment, long reaction time, and low stability, and achieve the effects of low equipment requirements, improved pulp whiteness, and increased selectivity

Inactive Publication Date: 2012-11-14
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The Schiff alkali metal complexes disclosed in the prior art have the disadvantages of low stability, poor selectivity, long reaction time, and high requirements for reaction equipment in pulp bleaching.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Embodiment 1: the process of immobilized Cu-salen catalyzed bleaching pulp, the specific content is as follows:

[0018] (1) Preparation of immobilized Cu-salen

[0019] ① Synthesis of Schiff base ligand Salen

[0020] Dissolve 2.5g of ethylenediamine and 8.5mL of salicylaldehyde in 18mL of methanol, stir in an ice-water bath for 30min, let stand for 15min, filter under reduced pressure, wash with 1mL of ether, and dry in vacuo at 33°C to obtain light yellow solid, recrystallized with 160 mL of absolute ethanol, and dried under vacuum at 33°C to obtain bright yellow crystals, namely the Schiff base ligand salen;

[0021] ② Synthesis of immobilized Cu-salen

[0022] 0.6389g CuAc 2 ·H 2 O was dissolved in 400 mL deionized water, then 20 g NaY molecular sieves were added, stirred at room temperature for 24 h, the solid was filtered, washed three times with deionized water, and finally dried at 120 °C for 12 h to obtain Cu / Y, respectively.

[0023] Mix Cu / Y with excess...

Embodiment 2

[0027] Embodiment 2: the technique of immobilized Mn-salen catalytic bleaching pulp, specific content is as follows:

[0028] (1) Preparation of immobilized Mn-salen

[0029] ① Synthesis of Schiff base ligand Salen

[0030] Dissolve 2.5g of ethylenediamine and 8.5mL of salicylaldehyde in 18mL of methanol, stir in an ice-water bath for 30min, let stand for 15min, filter under reduced pressure, wash with 1mL of ether, and dry in vacuo at 33°C to obtain light yellow solid, recrystallized with 160 mL of absolute ethanol, and dried under vacuum at 33°C to obtain bright yellow crystals, namely the Schiff base ligand salen;

[0031] ② Synthesis of immobilized Mn-salen

[0032] 0.6389g MnAc 3 4H 2 O was dissolved in 400 mL deionized water, then 20 g NaY molecular sieves were added, stirred at room temperature for 24 h, the solid was filtered out, washed three times with deionized water, and finally dried at 120 °C for 12 h to obtain Mn / Y, respectively.

[0033] Mix Mn / Y with exce...

Embodiment 3

[0037] Embodiment 3: the technique of immobilized Co-salen catalytic bleaching pulp, specific content is as follows:

[0038] (1) Preparation of immobilized Co-salen

[0039] ① Synthesis of Schiff base ligand Salen

[0040] Dissolve 2.5g of ethylenediamine and 8.5mL of salicylaldehyde in 18mL of methanol, stir in an ice-water bath for 30min, let stand for 15min, filter under reduced pressure, wash with 1mL of ether, and dry in vacuo at 33°C to obtain light yellow solid, recrystallized with 160 mL of absolute ethanol, and dried under vacuum at 33°C to obtain bright yellow crystals, namely the Schiff base ligand salen;

[0041] ② Synthesis of immobilized Co-salen

[0042] 0.6389g CoAc 2 ·H 2 O was dissolved in 400 mL deionized water, then 20 g NaY molecular sieves were added, stirred at room temperature for 24 h, the solid was filtered, washed three times with deionized water, and finally dried at 120 °C for 12 h to obtain Co / Y, respectively.

[0043] Mix Co / Y with excess S...

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Abstract

The invention relates to a technology for catalyzing and bleaching paper pulp with immobilized Schiff alkali metals, belonging to the technology for catalyzing and bleaching paper pulp. The method provided by the invention can ensure that paper pulp is catalyzed and bleached under a condition that immobilized Schiff alkali metals exist in a paper pulp bleaching treatment; and simultaneously peroxy acid and alcohol are added. The method provided by the invention is simple, is carried out easily, and is featured with remarkably effects; and the paper pulp bleaching effect is good.

Description

technical field [0001] The invention relates to a technique for bleaching pulp catalyzed by immobilized Schiff alkali metal, which belongs to the field of papermaking. Background technique [0002] Pulp bleaching is the process of removing color and increasing brightness. Conventional bleaching produces chlorinated organic compounds, which pollute the environment. The pulp and paper industry has minimized the use of chlorine bleaching. Effective degradation and selective removal of pulp bleached lignin are key processes. Therefore, the development of effective and selective bleaching agents remains a challenge for pulp bleaching. Biological bleaching using white rot fungi and enzymes is an option. Some reactions catalyzed by lignin peroxidase and manganese peroxidase can be catalyzed by non-enzymatic compounds, and these enzyme-mimetic systems have been valued as alternatives to lignin-degrading enzymes because they are more economical and easier to use; in this On the ...

Claims

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Application Information

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IPC IPC(8): D21C9/16
Inventor 周学飞张娜
Owner KUNMING UNIV OF SCI & TECH
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