Biological enzyme-based process for deinking wastepaper by neutral-alkaline dual-loop flotation

A waste paper deinking and bio-enzyme technology, applied in waste paper processing, papermaking, paper recycling, etc., can solve the problems of increasing waste paper fiber damage pollution load, inability to completely remove new ink, etc., to achieve good deinking effect, Less damage to strength properties and opacity, and the effect of improving strength properties

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

AI Technical Summary

Problems solved by technology

However, the traditional neutral and alkaline dual-circuit waste paper deinking process in the first stage of the neutral circuit only uses neutral deinking agents to remove flexographic printing inks, which cannot completely remove the existing new inks, resulting in the first The second-stage alkaline circuit needs to add more alkaline chemicals, which will increase the damage of waste paper fibers and the pollution load during the deinking process

Method used

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  • Biological enzyme-based process for deinking wastepaper by neutral-alkaline dual-loop flotation
  • Biological enzyme-based process for deinking wastepaper by neutral-alkaline dual-loop flotation
  • Biological enzyme-based process for deinking wastepaper by neutral-alkaline dual-loop flotation

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Effect test

Embodiment 1

[0030] In this embodiment, 200 g of waste newsprint (ONP) (moisture content 80%) is taken, and the following steps are used for deinking:

[0031] (1) Pulping: pulping in a hydraulic pulper, the pulping conditions are: pulping concentration 15%wt, pulping time 35min, pulping temperature 50°C, speed 300r / min.

[0032](2) Deinking: Add lipase and fatty alcohol polyoxyethylene ether sodium sulfate (AES), coconut acid diethanolamide ( 6501) and fatty alcohol polyoxyethylene ether (AEO-9), the amount of lipase and neutral deinking agent is 0.7u / g and 0.8% respectively (both relative to the mass of dry pulp) , Deinking after fully mixing, the deinking conditions are: the slurry concentration is 10%wt, the deinking temperature is 35°C, and the deinking time is 40min. After the waste paper pulp is deinked in the first stage, the second stage of alkaline hydrogen peroxide deinking is carried out directly. The deinking conditions are: the amount of NaOH is 2%, H 2 o 2 The dosage is 2...

Embodiment 2

[0043] In this example, 200g of mixed office waste paper (MOW) (moisture content 80%) was taken, and the following steps were used for deinking:

[0044] (1) Pulping: pulping in a hydraulic pulper, the pulping conditions are: pulping concentration 12%wt, pulping time 40min, pulping temperature 50°C, speed 300r / min.

[0045] (2) Deinking: Add lipase and fatty alcohol polyoxyethylene ether sodium sulfate (AES), coconut acid diethanolamide ( 6501) and fatty alcohol polyoxyethylene ether (AEO-9), the amount of lipase and neutral deinking agent is 0.8u / g and 1% respectively (both relative to the quality of dry pulp) , Deinking after fully mixing, the deinking conditions are: the slurry concentration is 10%wt, the deinking temperature is 40°C, and the deinking time is 45min. After the waste paper pulp is deinked in the first stage, it is directly deinked in the second stage with alkaline hydrogen peroxide. The deinking conditions are as follows: the amount of NaOH is 3%, H 2 o 2 ...

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Abstract

The invention discloses a biological enzyme-based process for deinking wastepaper by neutral-alkaline dual-loop flotation, which belongs to the technical field of pulping and papermaking processes. The technological characteristics of the process are as follows: in the process, a neutral mixed deinking agent is adopted for deinking in a first-section neutral loop in neutral-alkaline dual loops, wherein the neutral mixed deinking agent comprises biological enzymes and a neutral deinking agent; in a second-section alkaline loop, alkaline hydrogen peroxide is adopted for deinking, and then flotation and washing are conducted on the obtained object so as to obtain wastepaper pulp subjected to deinking. The process disclosed by the invention has the advantages of slight damages on the strength and the opaqueness of wastepaper fibers, large whiteness added value, low pollution load, and difficulty of yellow returning of bleached pulp.

Description

technical field [0001] The invention relates to the technical field of pulping and papermaking technology, in particular to the use of biological enzymes in the alkali double-circuit flotation deinking process in waste paper pulp. Background technique [0002] With the increasing shortage of plant resources and the emphasis on environmental protection, waste paper has become an important source of raw materials for the paper industry, and its proportion is increasing. Its recycling is to solve the shortage of raw materials, energy shortage and serious pollution faced by the paper industry. and other effective approaches to the three major issues. Deinking is an important step in waste paper recycling. Using good deinking technology to remove ink from paper and effectively protect waste paper fibers is the key to deinking waste paper. [0003] The methods used for waste paper deinking include mechanical method, chemical method and biological enzyme method. The traditional a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21C5/02
CPCY02W30/64
Inventor 万金泉孟庆林马邕文王艳黄明智陈杨梅
Owner SOUTH CHINA UNIV OF TECH
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