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Deinking Technique for news bogus paper through enzyme

A technology for newsprint, technology, used in the field of pulp and paper

Inactive Publication Date: 2006-03-08
QILU UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The industrial application of other enzymes that can be used for waste paper deinking has not been reported

Method used

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  • Deinking Technique for news bogus paper through enzyme

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] (1) Pulping: Pulping is carried out in a pulper. Add 8# American waste into the pulper, pass oxygen, add 0.2% deinking agent (the weight ratio of Tween80 and fatty alcohol polyoxyethylene ether is 1:1), 10LAMU / g laccase NS 51003 (Denmark Novozymes) production), 0.5% purple uric acid, and oxygen. Control the pulp concentration to 10%, the temperature to 60°C, the rotor rotation frequency of the pulper to be 25Hz, to disintegrate for 15-60 minutes, and to keep the temperature for 0-30 minutes.

[0016] (2) Flotation: Flotation is carried out in a flotation cell. Dilute the disintegrated pulp with water to a pulp concentration of 1%, add 0.1%-2.0% deinking agent, and control the ventilation volume to 8-25m 3 / h, the pressure is 0.3-1.0MPa, and the flotation is 5-30min at room temperature.

[0017] (3) Washing: the pulp after flotation is diluted to a pulp concentration of 0.2%-0.5%, and washed and concentrated through an 80-mesh copper mesh.

[0018] (4) Bleaching: The...

Embodiment 2

[0021] (1) Pulping: Pulping is carried out in a pulper. The "Life Daily" published by Dazhong Daily was added to the pulper, 0.2% deinking agent (Tween80 and fatty alcohol polyoxyethylene ether weight ratio 1:1), 10LAMU / g laccase NS 51003 (Denmark Novi Xin Corporation), 0.5% purple uric acid, and oxygen. Control the pulp concentration to 10%, the temperature to 60°C, the rotor rotation frequency of the pulper to be 25Hz, to disintegrate for 15-60 minutes, and to keep the temperature for 0-30 minutes.

[0022] (2) Flotation: Flotation is carried out in a flotation cell. Dilute the disintegrated pulp with water to a pulp concentration of 1%, add 0.1%-2.0% deinking agent, and control the ventilation volume to 8-25m 3 / h, the pressure is 0.3-1.0MPa, and the flotation is 5-30min at room temperature.

[0023] (3) Washing: the pulp after flotation is diluted to a pulp concentration of 0.2%-0.5%, and washed and concentrated through an 80-mesh copper mesh.

[0024] (4) Bleaching: T...

Embodiment 3

[0026] Example 3: As described in Example 1, the difference is that the deinking agent is Tween80.

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Abstract

A waste new print zyme deinking technology includes crushing the pulp, deinking, suspension selection, washing, bleaching among which, deinking agent, laccase, amboceptor are added into the pulped with waste newsprints and waster to be inlet with oxygen and the pulp concentration is controlled at 3%-18%, temperature 20-70deg.C pulping, keeping warmth.

Description

(1) Technical field [0001] The invention relates to an enzyme deinking technology for waste newsprint, belonging to the technical field of pulping and papermaking. (2) Background technology [0002] The recycling of waste paper is an effective way to solve the three major problems faced by the paper industry, such as shortage of raw materials, energy shortage and serious pollution. Deinking is the key to waste paper recycling technology. The traditional alkaline chemical deinking needs to add a lot of chemicals, which will increase the pollution load of the deinking wastewater; the waste paper containing more mechanical pulp will have the phenomenon of "alkali blackening" during the alkaline deinking process, which will cause Decrease in pulp brightness. In addition, traditional chemical deinking is not conducive to the improvement of pulp water drainage and strength properties. Compared with conventional chemical deinking, enzymatic deinking has many advantages: it can i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D21C9/10D21C5/02C09D9/04
CPCY02W30/64
Inventor 秦梦华徐清华傅英娟石淑兰
Owner QILU UNIV OF TECH
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