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Method for treating paper pulp by using 1-butyl-3-methylimidazole chloride

A technology of methyl imidazole and chloride is applied in the field of pulp processing to achieve the effects of improving physical indicators, improving fiber quality and reducing energy consumption for beating

Inactive Publication Date: 2010-08-18
QILU UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the method of using ionic liquids for pulp pretreatment before beating to improve beating performance has not been reported at present.

Method used

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  • Method for treating paper pulp by using 1-butyl-3-methylimidazole chloride

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Experimental program
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Effect test

Embodiment 1

[0015] The bagasse chemical pulp is conventionally beaten to a beating degree of 38.0°SR, the beating energy consumption is 420kW·h / t pulp, the fiber length is 1.18mm, and the fine component content is 14.2%. Use this slurry to make quantitative 68g / m 2 Cultural paper, the bulk thickness of the finished paper is 1.85cm 3 g -1 , whiteness 80.2% ISO, burst index 1.75KPa m 2 g -1 , Tensile index 45.8N m / g, folding number 356 times, tear index 4.58mN m / g 2 g -1 , the pulling speed is 1.12m / s, and the K&N value is 20.5.

[0016] The method of the invention is adopted to process the bagasse chemical pulp. Steps: Before beating, the pulp is concentrated, dried and dehydrated to a moisture content of 1.9%, and then the pulp is treated with 1-butyl-3-methylimidazolium chloride, and the treatment conditions are: 1-butyl-3-methylimidazolium chloride The dosage is 12L / kg slurry, the steam is indirectly heated, the temperature is 80°C, and the time is 120min. The pulp is washed aft...

Embodiment 2

[0019] Poplar high-yield pulp is beaten to a beating degree of 52.0°SR, the beating energy consumption is 1095kW·h / t pulp, the fiber length is 1.01mm, and the fine component content is 22.8%. Use this slurry to make paper with a weight of 70g / m 2 , the bulk thickness of the paper is 3.24cm 3 g -1 , whiteness 78.3% ISO, burst index 2.38KPa m 2 g -1 , tensile index 33.5N m / g, tear index 3.28mN m / g 2 g -1 , the pulling speed is 0.72m / s, and the K&N value is 25.3.

[0020] The method of the invention is used to treat the poplar high-yield pulp. Steps: after a period of rough refining, the poplar high-yield pulp is treated, the pulp is first concentrated, dried and dehydrated to a moisture content of 1.7%, and then the pulp is treated with recovered 1-butyl-3-methylimidazolium chloride, The dosage is 6L / kg pulp, microwave heating, temperature 100°C, time 80min, pulp is washed after treatment, and the removed 1-butyl-3-methylimidazolium chloride continues to be recycled.

[...

Embodiment 3

[0023] The taeda pine chemical pulp was conventionally beaten to a beating degree of 53.0°SR, the beating energy consumption was 545kW·h / t pulp, the fiber length was 2.41mm, and the fine component content was 8.2%. Use this slurry to make quantitative 70g / m 2 Cultural paper, the bulk thickness of the finished paper is 1.91cm 3 g -1 , whiteness 81.8% ISO, burst index 2.72KPa m 2 g -1 , Tensile index 46.2N m / g, folding number 487 times, tear index 6.04mN m / g 2 g -1 , the pulling speed is 1.21m / s, and the K&N value is 20.2.

[0024] The method of the invention is used to treat the taeda pine chemical pulp. Steps: Concentrate, dry and dehydrate the pulp to a moisture content of 1.5% before beating, and treat the pulp with 1-butyl-3-methylimidazolium chloride, and the treatment condition is the amount of 1-butyl-3-methylimidazolium chloride 5L / kg pulp, microwave heating, temperature 140°C, time 100min, wash the pulp after treatment, and recover 1-butyl-3-methylimidazolium ch...

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Abstract

The invention discloses a method for treating paper pulp by using 1-butyl-3-methylimidazole chloride, comprising the steps of: carrying out concentration drying dehydration on the paper pulp, and then filling the 1-butyl-3-methylimidazole chloride to treat the paper pulp; after treatment, washing the paper pulp by water for removing the 1-butyl-3-methylimidazole chloride; and then, entering the pulping work section for pulping. The 1-butyl-3-methylimidazole chloride removed by water washing can be recycled by simple dehydration. The method has simple operation and uses the ionic liquid which can be recycled, thus being environment-friendly. The paper pulp treated by the method reduces the pulping energy consumption, improves the fiber quality of the paper pulp, and enhances the physical indexes such as strength, white degree, surface performance, printing performance and the like of paper.

Description

technical field [0001] The invention relates to a pulp treatment method, in particular to a method for treating pulp with 1-butyl-3-methylimidazolium chloride. Background technique [0002] The beating of pulp is mechanically acting on the fibers to cause the fibers to undergo swelling, cutting, fibrillation and bending deformation to improve the papermaking performance of the pulp. The beating method is mainly divided into free beating and viscous beating. Free beating is mainly based on cutting action, and the concentration of pulp is low. The paper produced by this method has low surface smoothness and is easy to fluff. The viscous beating method is based on the principles of rupture and abrasion. The pulp concentration used is relatively high, the paper is more flexible, and the ink absorption effect is poor. Therefore, improving the beating performance of pulp is an urgent problem to be solved. [0003] Ionic liquids are organic salts that are liquid at 100°C, and th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21C3/18
Inventor 庞志强陈嘉川杨桂花董翠华刘玉
Owner QILU UNIV OF TECH
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