Process of pulp oxygen delignification catalysis based on M(salen) catalytic paper and surfactant

A surfactant and oxygen delignification technology, which is applied in the field of improved pulp oxygen delignification technology to achieve the effects of increasing delignification rate, reducing oxygen consumption and high catalytic efficiency

Active Publication Date: 2015-12-02
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But based on M(salen) catalytic paper and O 2 , Surfactant OB to form a new pulp oxygen delignification process, there is no relevant technical report yet

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] Embodiment 1: the catalytic pulp oxygen delignification process based on Zn (salen) catalytic paper and surfactant, concrete operation is as follows:

[0013] (1) Preparation of Zn(salen)

[0014] Preparation of Schiff base ligand salen

[0015] Dissolve 2.5g of ethylenediamine and 8.5ml of salicylaldehyde in 18ml of methanol, stir in ice water for 30min, let 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.

[0016] Synthesis of Zn(salen)

[0017] Dissolve 10.4 mmol of Schiff base salen in 120 ml of methanol, and another 10.4 mmol of zinc acetate dihydrate, dissolve in warm water, quickly transfer to the above reaction bottle, and quickly form a brown precipitate, heat at 70 ° C ~ 80 ° C Reflux for 1 hour, the brown precipitate turns into dark red crystals, cool to ...

Embodiment 2

[0022] Embodiment 2: based on the catalytic pulp oxygen delignification process of Cu (salen) catalytic paper and surfactant, concrete operations are as follows:

[0023] (1) For the preparation method of Cu(salen) catalytic paper, refer to Steps (1) and (2) of Example 1;

[0024] (2) In Cu(salen) catalytic paper, O 2 In the presence of surfactant OB-2, carry out oxygen delignification treatment on the pulp; when treating the pulp, the amount of Cu(salen) catalytic paper is 0.06% of the pulp mass, the treatment temperature is controlled at 90°C, and the time 60min; when dealing with pulp, O 2 The pressure is 0.3MPa, and the amount of surfactant OB-2 is 0.2% of the pulp mass. The delignification rate is 73%. The delignification rate is increased by 25% by this process, the viscosity is only reduced by 5%, and the oxygen consumption is 50%. This process can reduce the oxygen consumption by 25%.

Embodiment 3

[0025] Embodiment 3: based on the catalytic pulp oxygen delignification process of Mn (salen) catalytic paper and surfactant, concrete operations are as follows:

[0026] (1) For the preparation method of Mn(salen) catalytic paper, refer to steps (1) and (2) of Example 1;

[0027] (2) In Mn(salen) catalytic paper, O 2 In the presence of surfactant OB-2, carry out oxygen delignification treatment on the pulp; when treating the pulp, the amount of Mn(salen) catalytic paper is 0.09% of the pulp mass, and the temperature of the treatment is controlled at 100°C. 90min. When treating pulp, O 2 The pressure is 0.5MPa, and the amount of surfactant OB-2 is 0.3%. The delignification rate is 77%. The delignification rate is increased by 30% by this process, the viscosity is only reduced by 7%, and the oxygen consumption is 60%. This process can reduce the oxygen consumption by 30%.

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Abstract

The present invention discloses a pulp oxygen delignification process based on a M(salen) catalytic paper and a surfactant, and the present invention relates to a modified process of pulp oxygen delignification, and belongs to the technology of pulp oxygen delignification. The present invention mainly comprises the following steps of: 1. performing a oxygen delignification on pulp, and performing a oxygen delignification process on the pulp on the basis of a condition of M(salen) (M=Cu, Co, Fe, Mn,Zn) catalytic paper, O2, and surfactant OB; and 2. when performing oxygen delignification on the pulp, controlling temperature, time and use amount of the catalytic paper, oxygen pressure and surfactant of the process. According to the present invention, a non-polluting surfactant catalyzed pulp oxygen delignification technology is adopted, and the process is low in raw materials use amount, free of tough requirements on the environmental condition, properties of the pulp oxygen delignification are obviously improved, and medicament consumption can be significantly reduced.

Description

technical field [0001] The invention relates to a catalytic pulp oxygen delignification process based on M (salen) catalytic paper and a surfactant, which is an improved pulp oxygen delignification technology. Background technique [0002] As global environmental protection regulations are increasingly strengthened and strict, people's awareness of environmental protection is also increasing, making the paper industry have to adopt elemental chlorine-free (ECF) bleaching and total chlorine-free (TCF) bleaching technologies. Oxygen delignification has the advantages of less environmental pollution, high pulp yield, stable whiteness, less yellowing, good dehydration performance and low bleaching cost. In order to further improve the efficiency of oxygen delignification of pulp, methods such as biological enzymes and activators can be used. M(salen) catalyzed bleaching has been reported, and the stability and catalytic efficiency of the catalyst can be improved by immobilizing ...

Claims

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Application Information

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IPC IPC(8): D21C9/00
Inventor 周学飞高田田
Owner KUNMING UNIV OF SCI & TECH
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