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Alkaline biological enzyme deinking agent and application technology thereof in waste paper deinking

A waste paper deinking and biological enzyme technology, which is applied in the processing of waste paper, papermaking, paper recycling, etc., can solve the problems of poor catalytic deinking effect, etc., and achieve the effect of good deinking effect, simplified process and cost saving.

Active Publication Date: 2013-12-11
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The biological enzyme deinking agent of the present invention provides a novel biological enzyme deinking agent with alkali resistance and high catalytic activity aiming at the shortcomings of existing lipase-based deinking agents with poor catalytic deinking effect

Method used

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  • Alkaline biological enzyme deinking agent and application technology thereof in waste paper deinking

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Application of a biological enzyme deinking agent in the deinking of old newspapers (the effect of pulp concentration on deinking): 120g of old newspapers (best-dry pulp) that were manually shredded into 20mm×20mm and 1.0U / g of dry-dry pulp ARL lipase and 0.25% absolute dry pulp (w / w) Tween-80 were evenly mixed, the pulp concentrations were 8%, 10%, 12%, 15% and 18%, respectively, at 50°C (the optimal temperature for ARL ) under the condition of pulping for 25 minutes; then flotation in a 12L flotation tank with a slurry concentration of 1% and a temperature of 60-65°C for 7 minutes, and then washed with a punching screen for 2 minutes to 3 minutes. Each group of experiments was repeated 3 to 5 times. The experimental results show that when the pulp concentration is 10%, the whiteness of the deinked pulp is the highest, and the residual ink value is the lowest. Replace ARL with S7, repeat all the above experiments, the conclusion is the same.

Embodiment 2

[0038] Application of a biological enzyme deinking agent in the deinking of old newspapers (the effect of the amount of enzyme added on deinking): 120g of old newspapers (dry pulp) that were manually shredded into 20mm×20mm, with a pulp concentration of 10%, Mix evenly with ARL lipase and 0.25% Tween-80 of dry pulp (w / w), the addition amount of ARL lipase is 0.5, 1.0, 1.5, 2.0, 2.5 and 3.0U / g dry pulp, at 50 ℃ (the optimum temperature of ARL) for pulping for 25 minutes; then flotation in a 12L flotation tank with a slurry concentration of 1% and a temperature of 60-65℃ for 7 minutes, and then washed with a punching screen for 2 minutes to 3 minutes. Each group of experiments was repeated 3 to 5 times. The experimental results show that when the ARL addition amount is 1.0U / g absolute dry pulp, the whiteness of the deinked pulp is the highest, and the residual ink value is the lowest; When the pulp is dried, there is little difference in the whiteness and residual ink value of ...

Embodiment 3

[0040] Application of a biological enzyme deinking agent in the deinking of old newspapers (the impact of pulping time on the deinking effect): 120g of old newspapers (best dry pulp) hand-crushed into 20mm×20mm, with a pulp concentration of 10%, Mix evenly with 1.0U / g ARL lipase of dry pulp and 0.25% Tween-80 of dry pulp (w / w), and pulp at 50°C (the optimum temperature of ARL), and the time is 15 , 20, 25, 30, 35, 40, 50 and 60 minutes; then flotation in a 12L flotation tank with a slurry concentration of 1% and a temperature of 60-65°C for 7 minutes, and then washed with a punching screen for 2 minutes to 3 minutes. Each group of experiments was repeated 3 to 5 times. The experimental results show that it takes 20-30 minutes for the raw material - old newspapers to be crushed into pulp under the action of deinking agent and mechanical force. With the prolongation of time, the whiteness of the deinked pulp decreases and the residual ink value increases. Replace ARL with S7, r...

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Abstract

The invention discloses an alkaline biological enzyme deinking agent and an application technology thereof in waste paper deinking, and belongs to the industrial field of a novel biocatalyst and an application thereof. According to the technical scheme, the application technology comprises the following steps: making waste paper into paper pulp liquid with the pulp concentration of 10%-15%, adding 0.5*10<6>-15*10<6>U of alkaline lipase (ARL) and 0.2*10<6>-1*10<6>U of alkaline xylanase to per ton of oven dry stock, then adding a surface active agent-tween-80 to 0.06% oven dry stock (w / w), uniformly blending, and pulping for 20 minutes to 30 minutes at the optimum temperature of enzyme; and then carrying out flotation for 7 minutes to 10 minutes in a flotation tank under the conditions of the pulp concentration of 1% and the temperature of 60-65 DEG C, and washing for 2 minutes to 3 minutes with water by a punching sieve, thus obtaining delinked pulp. By adopting the deinking technology, the yield of the paper pulp is relatively high, and the COD (Chemical Oxygen Demand) value of waste water is low. The deinking technology is suitable for large-scale industrial application in production.

Description

technical field [0001] The invention belongs to the field of novel biocatalyst and its application industry, in particular to an alkaline biological enzyme deinking agent and its application process in waste paper deinking. Background technique [0002] In the waste paper recycling, the deinking agent is mainly used to destroy the adhesion of the ink to the fiber, so that the ink is peeled off from the fiber and dispersed in water. Traditional chemical deinking agents contain alkali, sodium silicate, hydrogen peroxide, additives and other chemicals, which play the role of wetting saponification, buffering, decolorization and penetration dispersion respectively. The chemical deinking effect is obvious, but the fiber loss is large, the paper strength is reduced, and the COD and BOD load of the wastewater is large. Over the past few decades, many enzymes (e.g. cellulase / hemicellulose, lipase, laccase) have been investigated as a substitute for chemical processes in the waste p...

Claims

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Application Information

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IPC IPC(8): D21C5/02D21C5/00
CPCY02W30/64
Inventor 林影龚艳韩双艳张建光
Owner SOUTH CHINA UNIV OF TECH
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