Paper pulp bleaching process

A pulp bleaching and process technology, applied in the field of pulp bleaching process, can solve problems such as high water consumption, paper industry pollution, etc., and achieve the effects of improving pulp yield, pulp polymerization degree, and folding endurance.
CN1401848AInactive Publication Date: 2003-03-12QILU UNIV OF TECH
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
QILU UNIV OF TECH
Publication Date
2003-03-12
Estimated Expiration
Not applicable · inactive patent

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Abstract

A process for bleaching paper pulp includes such steps as adding hypochlorite, prebleaching at 30-60 deg.C for 30-150 min, water washing, adding ClO2, bleaching and water washing. Its advantages are low pollution and low consumption of water.
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Description

[0001] (1) The technical field

[0002] The invention belongs to a pulp bleaching process, and particularly relates to a low-pollution and low-water consumption pulp bleaching process. (2) Background technology

[0003] my country is a non-wood pulp, especially a large producer of straw pulp, accounting for more than 60% of the world's total non-wood pulp. Non-wood pulp pulping black liquor is basically treated by burning alkali recovery, but the middle-stage wastewater of pulping (mainly bleaching wastewater) adopts the traditional CEH (chlorination-alkali treatment-hypochlorite bleaching) process. There are also the following problems:

[0004] (1) The amount of AOX produced in wastewater is large, about 5Kg or more per ton of slurry. AOX can adsorb organic halogens. Its main component is chlorinated phenols. Since the 1980s, it has been found to contain dioxin, a highly toxic substance. Dioxin is known to be the most toxic among toxicants. It has carcinogenicity, mutagenicity, t...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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