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Method for deinking and decoloring office waste paper by using ion liquid

An ionic liquid, office waste paper technology, applied in the processing of waste paper, recycling technology, papermaking, etc., to achieve the effects of mild operating conditions, low price, and simple equipment

Inactive Publication Date: 2008-01-09
CHANGZHOU INST OF ENERGY STORAGE MATERIALS &DEVICES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in practical applications, office waste paper contains not only cellulose but also impurities such as ink and pigment. How to efficiently use ionic liquid to dissolve cellulose and remove ink and pigment impurities is the key to recycling office waste paper. There are no reports on related technologies for deinking and decolorizing office waste paper

Method used

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  • Method for deinking and decoloring office waste paper by using ion liquid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035]The office waste paper used in the deinking experiment in the present invention is laser-printed office waste paper printed with ink. Adequate drying of office waste paper and ionic liquids is a must. Mix the laser printing waste paper with ink printed on the shredder and the ionic liquid ([BMIm]Cl) at a mass ratio of 1:10, that is, 0.5g:5g, and microwave the ionic liquid to melt it and add it. Waste paper, stir evenly so that the waste paper is completely soaked, and perform intermittent heating under the microwave power of 210W: heating for 10 seconds each time, then take it out and cool it in an ice-water bath for about 60s to 40°C, and then microwave for 10 seconds. Repeat for a total of about 1800 seconds of heating. Take a small amount of liquid to lay a film and press it, and observe under a microscope that there is no cellulose filament, then the cellulose is completely dissolved, and an ionic liquid / cellulose solution is obtained; the ink particles are suspende...

Embodiment 2

[0037] The office waste paper used in the decolorization experiment in the present invention is color copy paper. Adequate drying of office waste paper and ionic liquids is a must. Mix the color copy paper shredded with a shredder and the ionic liquid ([BMIm]Cl) at a mass ratio of 1:6.7, that is, 0.45g:3g, and microwave heating until the ionic liquid is melted, and then add waste paper and stir to make the waste paper. Completely soaked, heated intermittently under microwave power of 210W for 10 seconds each time, then taken out and cooled in an ice-water bath for about 60s to 40°C, then microwaved for 10 seconds, repeated in turn, heated for a total of 1500 seconds, take a small amount Lay the liquid film and press the tablet, and observe under the microscope that there is no cellulose filament, then the cellulose is completely dissolved, and thus the ionic liquid / cellulose solution is prepared.

[0038] The ionic liquid / cellulose solution was filmed, and the film was orange...

Embodiment 3

[0040] Take 1 g of the cellulose / ionic liquid solvent prepared in Example 1, spread it evenly in a polytetrafluoroethylene mold, and repeatedly soak and rinse with distilled water until the cellulose film is clear, transparent and colorless. Place the cellulose film in a ventilated place at room temperature and dry naturally. A transparent regenerated cellulose film was obtained. The film has better toughness and better mechanical properties.

[0041] The ionic liquid is dissolved in water and separated from the cellulose membrane. Take 5ml of water and ionic liquid clear solution in a test tube, add about 3g K 2 CO 3 Shake on a vortex mixer for 5 minutes to make K 2 CO 3 Completely dissolve and mix evenly, stand to form two phases, and the upper layer is the ionic-rich liquid phase. The upper phase ionic liquid is collected and subjected to distillation, concentration and drying to obtain pure ionic liquid with a recovery rate of 97%. The recovered ionic liquid can be ...

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Abstract

The invention relates to a method used ion liquid to process office waste paper de-inking de-coloring. It can solve the problems of pollution and unable reclaiming for the de-inking drugs. The ion liquid can be reclaimed to utilize circularly, which can save cost. The microwave heating device is simple, cheap, has moderate, non-toxic, and harmless operation condition.

Description

technical field [0001] The invention relates to a method for deinking and decolorizing office waste paper by utilizing ionic liquid. technical background [0002] Waste paper recycling is the process of separating the usable pulp cellulose from other components of paper (such as inks, pigments, inorganic fillers, laser toner particles, binders, etc.) and regenerating waste paper. Two kinds of materials are produced during the recycling process: 1. Pulp fibers, called "regenerated" fibers, can be reused as raw materials for papermaking. Due to the characteristics of the aggregated structure of cellulose in paper and the existence of a large number of hydrogen bonds between molecules and molecules, cellulose has the characteristics of insolubilization and insolubility in most solvents, and the processing performance is poor. 2. Composite waste, mainly including ink and pigment contained in waste paper. The residual amount of ink and pigment determines the quality of recycled...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21C5/02D21C9/10
CPCY02W30/64
Inventor 陈继郭琳刘郁
Owner CHANGZHOU INST OF ENERGY STORAGE MATERIALS &DEVICES
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