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Method for short-sequence bleaching of eucalyptus plank pulp with ozone

A technology of eucalyptus board and leather pulp, which is applied in pulp bleaching, acid acid/anhydride pulping, cellulose pulp post-treatment, etc. It can solve the problems of harsh environment, damage, large amount of bleaching wastewater discharge, hazards, etc., and achieve bleaching time Shorter, less pollution control cost, fewer bleaching stages

Active Publication Date: 2022-01-07
佛山市新纸道环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The traditional CEH three-stage bleaching wastewater discharges a large amount and contains a large amount of toxic and harmful AOX and other substances. These substances not only cause severe damage to the environment, but also cause immeasurable harm to human beings’ own papermaking.

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  • Method for short-sequence bleaching of eucalyptus plank pulp with ozone
  • Method for short-sequence bleaching of eucalyptus plank pulp with ozone
  • Method for short-sequence bleaching of eucalyptus plank pulp with ozone

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Embodiment Construction

[0029] The following description serves to disclose the present invention to enable those skilled in the art to carry out the present invention. The preferred embodiments described below are only examples, and those skilled in the art can devise other obvious variations.

[0030] Step 1: taking unbleached sulfate eucalyptus pulp as raw material, soaking and decomposing it, the concentration of the eucalyptus pulp is 10%;

[0031] Step 3: dry the thawed eucalyptus pulp with a flat centrifuge, and the dryness is between 35-40%;

[0032] Step 4: Mix the eucalyptus bark pulp obtained in step 3 with sulfuric acid, adjust the moisture to 10%, and the concentration of sulfuric acid is 2mol / L;

[0033] Step 5: Put the mixed eucalyptus pulp into a water bath and react for 30 minutes;

[0034] Step 6: Transfer the eucalyptus bark pulp obtained in step 5 to a stirred reactor, and feed into ozone, the amount of ozone is 1%wt, and the concentration of ozone is 90mg / L;

[0035] Step 7: W...

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Abstract

The invention provides a method for short-sequence bleaching of eucalyptus plank pulp with ozone. The method specifically comprises the following steps: step 1, mixing the eucalyptus plank pulp with sulfuric acid; 2, after mixing is completed, subjecting a mixed liquid to reaction for a period of time at a certain temperature; step 3, introducing ozone into a slurry obtained in the step 2 for a period of time; 4, adding hydrogen peroxide into a product obtained in the step 3 for bleaching, and obtaining the eucalyptus plank bleached pulp. The method is energy-saving, environment-friendly and high in production efficiency.

Description

technical field [0001] The invention relates to the technical field of papermaking technology and waste comprehensive utilization, in particular to a method for ozone short-sequence bleaching of eucalyptus pulp. Background technique [0002] The paper industry is an important raw material industry closely related to the national economy and social development. It is related to the country's economy, culture, production, national defense and many other aspects, and occupies an important position in the national economy [1]. The 2020 annual report of China's paper industry shows that in 2020, there will be about 2,500 paper and cardboard manufacturers nationwide, and the total national paper and cardboard output will reach 112.6 million tons, an increase of 4.06% over 2019. The national consumption of paper and paperboard is as high as 118.27 million tons, an increase of 10.49% compared with 2019. With the continuous development of science and technology, my country's pulp an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21C9/10D21C9/153D21C9/16D21C3/04
CPCD21C9/1057D21C9/1073D21C9/153D21C9/163D21C3/04
Inventor 李军朱忆魁万兴
Owner 佛山市新纸道环保科技有限公司