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Deinking method of waste paper alkaline enzyme

An alkaline enzyme and waste paper technology, applied in the processing of waste paper, papermaking, paper recycling, etc., can solve the problems of low activity, difficulty, single composition, etc., and achieve the effect of simplified steps, obvious effect, energy saving and water saving.

Inactive Publication Date: 2010-04-07
南京川平科技开发有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In order to solve the disadvantages that most of the deinking enzymes in the prior art are acid enzymes with low activity and single composition, and are difficult to use in large-scale deinking production, the present invention provides an alkaline deinking enzyme for waste paper Biological enzyme deinking method, can deink under neutral and alkaline conditions, high enzyme activity

Method used

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  • Deinking method of waste paper alkaline enzyme
  • Deinking method of waste paper alkaline enzyme
  • Deinking method of waste paper alkaline enzyme

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Disposal of mixed office waste paper

[0028] After adding 15%wt of water required for slurry concentration into the beaker, put it in a constant temperature water bath at 60°C, and then add 0.20%-2.00%wt of surfactants such as fatty alcohol polyoxyethylene ether, alkylbenzenesulfonic acid Salt. Take 15g of absolute dry mixed office waste paper, in which the ratio of laser printing paper and electrostatic copy paper is 7:3, tear it into strips of 10×15cm and put it in a plastic beaker, soak for 3 to 5 minutes, start the strong constant Speed ​​blender, stirring to shred the waste paper. and use CH 2 COOH or NaOH adjusts the pH of the pulp to 7-11. Then add required enzyme amount, xylanase 100-200μ / g absolute dry pulp, pectinase 70-120μ / g absolute dry pulp, amylase 50-100U / g absolute dry pulp. The reaction time is 10-30min. Dilute the slurry after enzyme treatment to 1%wt, then add 0.05%-0.20%wt anhydrous CaCl 2 , Carry out flotation in the flotation tank, the flot...

Embodiment 2

[0039] Embodiment 2 processes old newsprint

[0040] The treatment process is the same as in Example 1, except that the flotation process is omitted and the water is directly washed. After adding 15% of the water required for slurry concentration into the beaker, put it in a constant temperature water bath at 60°C, and then add 0.20%-1.50% of surfactants such as fatty alcohol polyoxyethylene ether, sodium alkylbenzene sulfonate, Take 15g of dry old newsprint, the waste paper is taken from Wuhan Chenming Paper Co., Ltd., it is imported American waste 8# and 10#, the ratio of 8# / 10# is 7 / 3, tear it into strips of 10×15cm Put it into a plastic beaker, soak for 3 to 5 minutes, start a powerful constant speed mixer, and stir to disintegrate the waste paper. And adjust the pH of the pulp to 7-11. Then add the required enzyme amount, xylanase 120-200μ / g, pectinase 80-100μ / g, amylase 60-120U / g. The reaction time is 15-30min. After the enzyme treatment, the obtained slurry was wash...

Embodiment 3

[0049] After adding 15% of the water required for slurry concentration into the beaker, put it in a constant temperature water bath at 60°C, and then add 0.24%-1.69% surfactants such as fatty alcohol polyoxyethylene ether, alkylbenzene sulfonate, Take 15g of absolute dry mixed office waste paper, in which the ratio of laser printing paper and electrostatic copy paper is 7:3, tear it into strips of 10×15cm and put it in a plastic beaker, soak for 3 to 5 minutes, start the strong constant Speed ​​blender, stirring to shred the waste paper. and use CH 2 COOH or NaOH adjusts the pH of the pulp to 7-11. Then add the required amount of enzymes, xylanase 80-180μ / g dry pulp, pectinase 70-100μ / g dry pulp, amylase 50-100U / g dry pulp, and cellulase 30-100μ / g dry pulp, enzyme activator sodium chloride or sodium sulfate 0.5%-2.0%. The reaction time is 10-30min. Dilute the slurry after enzyme treatment to 1%wt, then add 0.05%-0.20%wt anhydrous CaCl 2 , Carry out flotation in the flotat...

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Abstract

The invention discloses a deinking method of waste paper alkaline enzyme, comprising the following steps: carrying out soaking, disintegration, enzyme processing and washing on the waste paper to obtain the processed pulp; adding surface active agent when soaking at a usage amount of 0.10%-2.00%wt, wherein the enzyme processing is carried out under the conditions that the pH is 6-11, the temperature is 45-75 DEG C, and xylanase 30-150 mu / g of oven dry stock, pectinase 40-100 mu / g of oven dry stock and amylase 50-120 mu / g of oven dry stock are adopted to process the disintegrated waste paper for 10-30min. Cellulase can also be added in the enzyme processing procedure with an added quantity of 100 mu / g of oven dry stock. The processing effect is better if enzyme activator, such as sodium chloride is added in the enzyme processing procedure; and the alkaline enzyme can be bathed and used in a matching manner with a plurality of surface active agent, even with compounds with certain oxidation functions; and the process of waste paper deinking technology can be shortened and the bleaching process in deinking by the conventional enzyme method can be left out.

Description

technical field [0001] The invention relates to a method for deinking waste paper, in particular to a method for deinking using biological enzymes. Background technique [0002] In the past ten years, waste paper treatment technology has been continuously improved and perfected, and the recovery rate and utilization rate of waste paper have increased year by year. According to the statistics of major paper-producing countries and regions in 1998, a total of 117 million tons of secondary fibers were recovered, with a recovery rate of 38.8% and a utilization rate of 42.6%. South Korea has the highest recovery rate of waste paper, reaching 73.8%, and Mexico has the highest utilization rate. According to the predictions of the United Nations and the World Food and Agriculture Organization, the waste paper utilization rate in 2010 will reach 50.9%. Every ton of waste paper used is equivalent to saving 3m 3 Wood, 1.2 tons of coal, 600 kwh electricity, 100m 3 water. It can be s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21C5/02D21C9/08C12S3/08
CPCY02W30/64
Inventor 王传槐朱凯
Owner 南京川平科技开发有限公司
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