A pulp delignification process catalyzed by immobilized M([H4]salen)

A technology for delignification and pulping, which is applied in the field of improved pulp delignification technology to reduce chemical consumption, facilitate process implementation, and improve the effect of pulp delignification

Inactive Publication Date: 2015-07-08
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But immobilized M ([H 4 ]salen) and hydrogen peroxide to form a new catalytic pulp delignification process, there is no relevant technical report yet

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Embodiment 1: immobilized Cu ([H 4 ]salen) catalyzed pulp delignification process, the specific operation is as follows:

[0016] (1) Immobilized Cu ([H 4 ] salen) preparation

[0017] A, the preparation of Schiff base ligand salen

[0018] 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.

[0019] B, Preparation of tetrahydro-Schiff base ligand [H4]Salen

[0020] 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...

Embodiment 2

[0027] Embodiment 2: immobilized Co ([H 4 ]salen) catalyzed pulp delignification process, the specific operation is as follows:

[0028] (1) Immobilized Co ([H 4 ]salen) for the preparation process with reference to the method in Example 1 step (1);

[0029] (2) Immobilized Co([H 4 ]salen) catalytic pulp delignification

[0030] In immobilized M ([H 4 ]salen) (M=Co), H 2 o 2 Under the condition of existence, carry out delignification treatment to pulp; When processing pulp, immobilized M ([H 4 ]salen) is used in an amount of 0.07% of the pulp mass, and the temperature of the treatment is controlled at 70°C for 80 minutes. During the pulp treatment, H was also added 2 o 2 , H 2 o 2 The dosage is 0.7% of the pulp quality; the delignification rate is 60%, and the delignification rate is increased by 25% by this process; the hydrogen peroxide consumption is 50%, and the hydrogen peroxide consumption can be reduced by 25% by this process.

Embodiment 3

[0031] Embodiment 3: immobilized Fe ([H 4 ]salen) catalyzed pulp delignification process, the specific operation is as follows:

[0032] (1) Immobilized Fe ([H 4 ]salen) for the preparation process with reference to the method in Example 1 step (1);

[0033] (2) Immobilized Fe ([H 4 ]salen) catalytic pulp delignification

[0034] In immobilized M ([H 4 ]salen) (M= Fe), H 2 o 2 Under the condition of existence, carry out delignification treatment to pulp; When processing pulp, immobilized M ([H 4 ]salen) is used in an amount of 0.1% of the pulp mass, the temperature of the treatment is controlled at 90°C, and the time is 120min. When the pulp is treated, H 2 o 2 , H 2 o 2The dosage is 1.2% of the pulp quality; the delignification rate is 70%, and the delignification rate is increased by 25% by this process; the hydrogen peroxide consumption is 60%, and the hydrogen peroxide consumption can be reduced by 30% by this process.

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Abstract

The invention discloses a pulp delignification process catalyzed by immobilized M([H4]salen), and belongs to a pulp delignification technique. According to the process, pulp is delignified under the existence of the immobilized M([H4]salen) (with the M being Cu, Co, Fe, Mn or Zn) and H2O2. The process adopts a pollution-free pulp catalytic delignification technique, is low in raw material using amount, free of strict requirements on environment conditions, can obviously improve each property of pulp delignification and degradation and can obviously reduce consumption of agents.

Description

technical field [0001] The present invention relates to a kind of immobilization M ([H 4 ] salen) catalytic pulp delignification process, is an improved pulp delignification technology. Background technique [0002] In recent years, due to the requirements of environmental protection, the pulp delignification 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 a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21C9/16
CPCD21C9/16
Inventor 周学飞
Owner KUNMING UNIV OF SCI & TECH
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