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membranous m([h 4 ]salen) catalyzed pulp bleaching process

A pulp bleaching and film-like technology, which is applied in the field of improved pulp bleaching technology, can solve the problems of easy separation of catalysts, etc., and achieve the effects of reducing chemical consumption, improving pulp bleaching, and increasing pulp whiteness

Active Publication Date: 2017-11-10
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the general immobilization still has the problem that the catalyst is easy to separate, and M([H 4 ] salen) firmly attached to the surface of the substrate. Avoid catalyst separation problems during use

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Embodiment 1: membranous M ([H 4 ] salen) the technique of catalyzed pulp bleaching, concrete operation is as follows:

[0019] (1) Cu ([H 4 ] salen) preparation

[0020] Dissolve 2.5g of ethylenediamine and 8.5mL of salicylaldehyde in 18mL of methanol, stir in ice water for 30min, let it stand for 15min, filter under reduced pressure with a G3 glass vessel, wash with 1mL of ether, and dry in vacuo at 33°C to obtain Pale yellow crystals, recrystallized with 160ml of absolute ethanol, and vacuum-dried at 33°C to obtain yellow crystals to obtain the Schiff base ligand salen;

[0021] 6.32 Schiff's base was dissolved in 920mL of methanol, and then 0.42 sodium borohydride (NaBH 4 ), stirred at room temperature for 2 hours, and the solvent was removed by distillation under reduced pressure, the crude product was washed with water, and then recrystallized with ethanol to obtain [H 4 ] White crystal of Salen ligand;

[0022] Weigh 2.32g ligand [H 4 ]salen was dissolved i...

Embodiment 2

[0027] (1) Film-like Co ([H 4 ]salen) for the preparation process with reference to the method in Example 1 step (1);

[0028] (2) In membranous M ([H 4 ]salen) (M=Co), the pulp is treated; when the pulp is treated, the membranous M ([H 4 ]salen) is used in an amount of 0.04% of the pulp mass, and the temperature of the treatment is controlled at 75°C for 90 minutes. When treating pulp, O 2 , O 2 The pressure is 0.2MPa; using this process improves the pulp whiteness by 25% compared with the general solid-supported catalyst; the oxygen consumption is 35%, and the use of this process can reduce the oxygen consumption by 25% compared with the general solid-supported catalyst.

Embodiment 3

[0030] (1) Film Fe ([H 4 ]salen) for the preparation process with reference to the method in Example 1 step (1);

[0031] (2) In membranous M ([H 4 ]salen) (M=Fe), the pulp is treated; when the pulp is treated, the membranous M ([H 4 ]salen) is used in an amount of 0.08% of the pulp quality, and the temperature of the treatment is controlled at 90°C for 120 minutes; when the pulp is processed, O 2 , O2 The pressure is 0.3MPa. Using this process improves the pulp whiteness by 30% compared with ordinary solid-supported catalysts; the oxygen consumption is 40%, and using this process can reduce oxygen consumption by 30% compared with ordinary solid-supported catalysts.

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PUM

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Abstract

The invention discloses a process for bleaching membrane-shaped M ([H4] salen) catalytic paper pulp. In the presence of membrane-shaped M ([H4] salen) (M equal to Cu, Co, Fe, Mn and Zn), treatment is carried out on the pulp. The process adopts a pollution-free pulp catalytic delignification technology, is less in raw material dose, is free of strict requirement on environmental condition, is capable of obviously improving whiteness and various properties of the paper pulp, and is capable of obviously reducing reagent consumption.

Description

technical field [0001] The present invention relates to a kind of membranous M ([H 4 ] salen) catalyzed pulp bleaching process, is an improved pulp bleaching technology. Background technique [0002] In recent years, due to the requirements of environmental protection, the pulp bleaching industry has turned to fully chlorine-free bleaching. In order to improve the efficiency of pulp delignification, methods such as biological enzyme treatment and chemical catalysis can be used. At present, the research in this area is relatively in-depth. They interact with certain components in lignin to form favorable conditions for pulp delignification and improve the bleaching performance of pulp. M ([H 2 ] salen) catalytic delignification has been reported. By reducing M ([H 2 ]salen), get M ([H 4 ]salen) (M=Cu, Co, Fe, Mn, Zn), making the C=N bond become a C-N bond, improving the catalytic activity of the catalyst; further improving the stability and activity of the catalyst thro...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D21C9/10D21C9/147
CPCD21C9/1036D21C9/147
Inventor 周学飞
Owner KUNMING UNIV OF SCI & TECH