Environment-friendly and efficient waste paper deinking method

A waste paper deinking and waste paper technology, which is applied in the field of papermaking, can solve the problems of inability to achieve quality, efficiency, environmental protection, cumbersome addition of deinking agent, and inability to meet the needs of deinking, and achieve excellent biodegradability and efficient Facilitate the removal and increase the effect of hydrolysis speed

Active Publication Date: 2017-11-03
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The current deinking methods for waste paper either use a single deinking process that cannot meet the deinking requirements, or use part of the combined technology but need to add chemicals that are unfavorable to the environment during the deinking process, and the addition of deinking agents requires The process of joining at different stages is complicated, and it is impossible to achieve the purpose of taking into account quality, efficiency and environmental protection

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Follow the steps below for deinking:

[0033] (1) Tear the mixed office waste paper into small pieces of 2cm×2cm, mix well, add appropriate amount of water and soak for 20min.

[0034] (2) Add 15U / g cutinase, 5U / g amylase, 10U / g lipase in turn; The mass ratio of phenol sulfonate and fatty alcohol polyoxyethylene ether sulfate is 2:1:1; it is evenly stirred with waste paper, and placed in a hydraulic pulper for pulping. The slurry concentration is controlled at 10%, the rotational speed of the pulper is 200r / min, the pulping time is 60min, and the pulping temperature is 50°C.

[0035] (3) After pulping, the slurry is subjected to ultrasonic treatment, the frequency is 45KHz, and the treatment time is 20min.

[0036](4) After the ultrasonic treatment is completed, the slurry is properly diluted, and zeolite is added to the pulp for adsorption treatment, the slurry concentration is 1%, and the treatment time is 20 minutes. After the adsorption is completed, gradient cen...

Embodiment 2

[0040] Follow the steps below for deinking:

[0041] (1) Tear the mixed office waste paper into small pieces of 2cm×2cm, mix well, add appropriate amount of water and soak for 10min.

[0042] (2) add 5U / g cutinase, 15U / g amylase, 10U / g lipase successively; Surfactant addition is 0.2% of waste paper dry mass, in surfactant, cardanol polyoxyethylene ether, The mass ratio of cardanol sulfonate and fatty alcohol polyoxyethylene ether sulfate is 1:1:2: Stir with waste paper evenly, and place it in a hydraulic pulper for pulping. The slurry concentration is controlled at 9%, the rotational speed of the pulper is 200r / min, the pulping time is 30min, and the pulping temperature is 40°C.

[0043] (3) After pulping, the slurry is subjected to ultrasonic treatment, the frequency is 40KHz, and the treatment time is 10min.

[0044] (4) After the ultrasonic treatment is completed, the slurry is properly diluted, and diatomaceous earth is added to the pulp for adsorption treatment, the slu...

Embodiment 3

[0048] (1) Tear the mixed office waste paper into small pieces of 2cm×2cm, mix well, add appropriate amount of water and soak for 20min.

[0049] (2) add 10U / g cutinase, 5U / g amylase, 15U / g lipase successively; Surfactant addition is 0.4% of waste paper dry mass, in surfactant, cardanol polyoxyethylene ether, The mass ratio of cardanol sulfonate and fatty alcohol polyoxyethylene ether sulfate is 1:1:2; it is evenly stirred with waste paper, and placed in a hydraulic pulper for pulping. The slurry concentration is controlled at 8%, the speed of the pulper is 250r / min, the pulping time is 40min, and the pulping temperature is 50°C.

[0050] (3) After the pulping is finished, the slurry is subjected to ultrasonic treatment, the frequency is 50KHz, and the treatment time is 30min.

[0051] (4) After the ultrasonic treatment is completed, the slurry is properly diluted, and sepiolite is added to the pulp for adsorption treatment, the slurry concentration is 3%, and the treatment t...

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Abstract

The invention discloses an environment-friendly and efficient waste paper deinking method, and belongs to the technical field of papermaking. The invention adopts a combined technology of bioenzymes, environment-friendly surfactants, ultrasonic treatment, adsorption and flotation. In the deinking process, connection between fiber and ink is cut off by adding a complex enzyme of cutinase, amylase, lipase, cellulase, hemicellulase, laccase and other bioenzymes, and in combination with the surfactants with good biodegradability, namely cardanol polyoxyethylene ether, cardanol sulfonate and fatty alcohol polyoxyethylene ether sulfate, the ink is emulsified and dispersed. By the combined method, the production cost and the subsequent wastewater treatment cost are reduced and the environment pollution is reduced.

Description

technical field [0001] The invention relates to an environmentally friendly and efficient waste paper deinking method, which belongs to the technical field of papermaking. Background technique [0002] In recent years, with the continuous reduction of the earth's forest resources and people's increasing emphasis on environmental protection, secondary fiber has become an important fiber source in the paper industry worldwide. It has become more and more common behavior to use waste paper as an important papermaking raw material and improve the recycling rate of waste paper. [0003] Waste paper pulping has a series of advantages, such as reducing pollution and saving resources. However, in the process of waste paper deinking and recycling, there are also a series of problems such as poor product quality and damage to the ecological environment. Traditional deinking methods usually add NaOH, Na 2 SiO 3 、H 2 o 2 , EDTA and other chemicals, the addition of these drugs not o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21C5/00D21C5/02
CPCD21C5/005D21C5/025Y02W30/64
Inventor 龙柱王凤
Owner JIANGNAN UNIV
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