Deinking Technique for news bogus paper through enzyme

A technology of newsprint, technology, applied in the field of pulp and paper making

Inactive Publication Date: 2005-01-12
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. 8# American waste is added in the pulper, ventilated oxygen, add 0.2% deinking agent (Tween80 and fatty alcohol polyoxyethylene ether weight ratio 1: 1), 10LAMU / g laccase NS 51003 (Denmark Novozymes company production), 0.5% violuric acid, and oxygen. Control pulp concentration to 10%, temperature at 60°C, pulper rotor rotation frequency at 25Hz, crushing for 15-60min, and heat preservation for 0-30min.

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

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

[0018] (4) Bleaching: The deinked pulp is bleached with hydrogen peroxide. Slurry conce...

Embodiment 2

[0021] (1) Pulping: Pulping is carried out in a pulper. The "Life Daily" published by Dazhong Daily was added to the pulper, and 0.2% deinking agent (Tween80 and fatty alcohol polyoxyethylene ether weight ratio 1: 1), 10LAMU / g laccase NS 51003 (Novi, Denmark) was added to the pulper. Xin company production), 0.5% violin, through oxygen. Control pulp concentration to 10%, temperature at 60°C, pulper rotor rotation frequency at 25Hz, crushing for 15-60min, and heat preservation for 0-30min.

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

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

[0024] (4) Bleaching: The deinked pulp is bleached with h...

Embodiment 3

[0026] Embodiment 3: As described in embodiment 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. Traditional alkaline chemical deinking needs to add a lot of chemicals, which will cause an increase in the pollution load of deinking wastewater; waste paper containing more mechanical pulp will experience "alkali blackening" in the process of alkaline deinking, which will cause Reduction of pulp brightness. In addition, traditional chemical deinking is not conducive to the improvement of pulp drainage and strength properties. Compared with conventional chemical deinking, enzymatic deinking has many advantages: it can increase the remova...

Claims

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Application Information

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