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A method of reducing oxalate formation during oxygen delignification

A technology of oxygen delignification and medium oxalate, which is applied in the field of pulp and paper making, can solve the problems of complicated operation, long time consumption, and reduced production efficiency, and achieve the effects of simple operation, improved pulp properties, and reduced consumption

Active Publication Date: 2018-01-16
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These methods are complicated to operate, take a long time, and reduce production efficiency

Method used

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  • A method of reducing oxalate formation during oxygen delignification
  • A method of reducing oxalate formation during oxygen delignification
  • A method of reducing oxalate formation during oxygen delignification

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Eucalyptus kraft pulp

[0028] (1) Sodium phytate combined with ultrasonic treatment

[0029] Add sodium phytate (20kg / t absolute dry pulp) to the pulp, adjust the pulp concentration to 10%, perform ultrasonic treatment for 60 minutes after mixing evenly, the ultrasonic power is 200W, and the treatment temperature is 50°C, and the pulp is washed after treatment.

[0030] (2) Oxygen delignification

[0031] Add sodium hydroxide (10kg / t absolute dry pulp) and magnesium hydroxide (10kg / t absolute dry pulp) to the treated eucalyptus kraft pulp, adjust the pulp concentration to 10%, and introduce oxygen for oxygen delignification The oxygen delignification temperature is 100° C., the oxygen pressure is 0.8 MPa, and the time is 60 minutes. After the end, the pulp is washed.

[0032] Experimental results:

[0033]

Embodiment 2

[0035] Bamboo Kraft Pulp

[0036] (1) Sodium phytate combined with ultrasonic treatment

[0037] Add sodium phytate (10kg / t absolute dry pulp) to the pulp, adjust the pulp concentration to 10%, perform ultrasonic treatment for 45min after mixing evenly, the ultrasonic power is 500W, and the treatment temperature is 30°C, and the pulp is washed after treatment.

[0038] (2) Oxygen delignification

[0039] Add sodium hydroxide (15kg / t absolute dry pulp) and magnesium hydroxide (5kg / t absolute dry pulp) to the treated bamboo sulfate pulp, adjust the pulp concentration to 10%, and feed oxygen to carry out oxygen delignification , the oxygen delignification temperature is 100° C., the oxygen pressure is 0.8 MPa, and the time is 60 minutes. After the end, the pulp is washed.

[0040] Experimental results:

[0041]

Embodiment 3

[0043] Acacia kraft pulp

[0044] (1) Sodium phytate combined with ultrasonic treatment

[0045] Add sodium phytate (25kg / t absolute dry pulp) to the pulp, adjust the pulp concentration to 10%, perform ultrasonic treatment for 120min after mixing evenly, the ultrasonic power is 500W, and the treatment temperature is 50°C, and the pulp is washed after treatment.

[0046] (2) Oxygen delignification

[0047] Add sodium hydroxide (10kg / t absolute dry pulp) and magnesium hydroxide (15kg / t absolute dry pulp) to the treated acacia kraft pulp, adjust the pulp concentration to 10%, and introduce oxygen for oxygen delignification The oxygen delignification temperature is 100° C., the oxygen pressure is 0.8 MPa, and the time is 60 minutes. After the end, the pulp is washed.

[0048] Experimental results:

[0049]

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Abstract

The invention discloses a method for reducing oxalate radicals formed in an oxygen delignification process. The method is characterized by comprising the following steps: (1) ultrasonically processing sodium phytate: adding sodium phytate into paper pulp, controlling pulp concentration at 5%-15%, uniformly mixing and then ultrasonically processing and washing after the ending of processing; (2) oxygen delignification: adding sodium hydroxide and magnesium hydrate into the pulp after being processed, controlling the pulp concentration at 5%-15%, performing oxygen delignification, and then washing. The sodium phytate adopted in the method is an important pure natural green additive, has strong chelation effect with metal ions and has the advantages of economic and environment-friendly effects, simplicity in operation and high pulp whiteness after bleaching. The oxygen delignification for the pulp according to the method can increase the whiteness of the pulp, can reduce the forming of the oxalate radicals in the oxygen delignification process and can reduce the pollution load of the oxygen delignification wastewater.

Description

technical field [0001] The invention relates to a method for reducing the formation of oxalate in the process of oxygen delignification, and belongs to the technical field of pulping and papermaking. Background technique [0002] With the improvement of people's awareness of protection, the pulp and paper industry's bleaching technology is gradually getting rid of the dependence on chlorine, and then develops ECF and TCF bleaching technologies. In order to achieve the same whiteness effect as the chlorine bleaching process, while reducing the consumption of reactants and environmental pollution, oxygen delignification technology has been developed. Oxygen delignification, also known as oxygen-alkali bleaching, is to dissolve and remove lignin in pulp by using magnesium salt as a protective agent to react pulp with oxygen in an alkaline environment and using various oxygen-containing active substances. process. Compared with traditional bleaching technology, oxygen delignif...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D21C9/147D21C9/10
CPCD21C9/1026D21C9/1063D21C9/147
Inventor 李海龙刘莹莹刘梦茹
Owner SOUTH CHINA UNIV OF TECH
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