CN1786335A - Process for bleaching wheat straw grass pulp by alkaline method - Google Patents
Process for bleaching wheat straw grass pulp by alkaline method Download PDFInfo
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- CN1786335A CN1786335A CN 200510102198 CN200510102198A CN1786335A CN 1786335 A CN1786335 A CN 1786335A CN 200510102198 CN200510102198 CN 200510102198 CN 200510102198 A CN200510102198 A CN 200510102198A CN 1786335 A CN1786335 A CN 1786335A
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Abstract
The invention discloses a wheat straw hood pulp alkaline process bleaching method. It includes the following steps: respectively adding solubility magnesium salt, chelating agent, hydrogen peroxide, sodium hydroxide, sodium silicate into 10%-12% weight wheat straw hood pulp; inputting oxygen with 0.5-1.3MPa pressure; bleaching at 60-110 centigrade degree for 40-100 min. the invention can realize wheat straw hood pulp short sequence and short time bleaching. Whiteness of the bleaching pulp is high and stable to ensure sanitary quality and not produce poisonous substance.
Description
Technical field
The present invention relates to a kind of post-processing approach of cellulose pulp, particularly a kind of alkaline process method for bleaching of Straw Pulp.
Background technology
China is the papermaking big country of wood raw material shortage of resources, and careless class is the important source material of China's paper industry, and wheat straw raw material is wherein most important a kind of, has every year 8000 ten thousand tons of wheat straws that the pulping and paper-making utilization can be provided approximately.At present, the bleaching process and the technology of China's Straw Pulp (comprising other straw pulps) are very backward, middle-size and small-size paper plant generally adopts calcium hypochlorite single stage bleaching (being that H floats), the general so-called C-E-H tri-stage bleaching of being made up of chlorination (C), alkali treatment (E) and calcium hypochlorite (H) that adopts of big-and-middle-sized factory.In recent years, there is part factory on C-E-H bleaching basis, to increase hydrogen peroxide and floats (P), form C-E-H-P and float for four sections.
Paper pulp is in the chlorine bleaches bleaching process, a large amount of organic chlorides (being TOCl, slurry 4-8 kilogram per ton) that produce, wherein considerable part can be adsorbed by animals and plants, be poisonous even carcinogenic, as 2,3,7,8-tetrachloro hexichol Er Evil (being TCDD) and 2,3,7,8-Tetrachlorodibenzofuran (TCDF) etc.In C-E-H tri-stage bleaching process, the noxious material that the H section is overflowed mainly is chloroform (CHCl
3), the pollutant that C section and E section are overflowed is maximum, toxicity is the strongest, as TCDD and TCDF etc.These pollutant overwhelming majority are discharged with waste water, the water system around the severe contamination plant area, and the harm ecological environment, small amounts of contamination remains in the bleached pulp, hygienic quality and purposes that slurry is floated in influence.Simultaneously, the Cl in the chlorine-contained wastewater
-Ion at high temperature can the heavy corrosion reclaimer, makes factory can't carry out the recycle of waste water.In addition, the H of paper pulp bleaching or C-E-H bleaching and C-E-H-P bleaching have low, the intensity difference of yield of bleached pulp, whiteness low (only 70%～80%ISO), distinct disadvantage such as retention of whiteness difference.
At present, international paper pulp mainly uses O completely without polluting method for bleaching
2, H
2O
2And O
3Be bleaching agent, form 4～6 sections multistage bleaching, and in order to bleached wood pulp.Straw pulp has the advantages that obviously be different from wood pulp, is not used for bleaching straw pulp as yet completely without polluting bleaching technology.
Summary of the invention
The present invention has overcome deficiency of the prior art, a kind of alkaline process method for bleaching of Straw Pulp is provided, can realize the short preface of Straw Pulp, in short-term, bleached pulp brightness height, retention of whiteness height, hygienic quality is good, do not produce noxious material in the bleaching process, can realize the closed circulation of waste water, thoroughly pollution abatement.
The alkaline process method for bleaching of Straw Pulp of the present invention, be that solubility magnesium salts, chelating agent, hydrogen peroxide, NaOH and sodium metasilicate are joined respectively in the Straw Pulp that concentration is 10%～12% weight, feed the oxygen that pressure is 0.5～1.3MPa then, under 60～110 ℃ temperature, finish bleaching through 40～100 minutes, the parts by weight consumption of said components is:
Over dry Straw Pulp 100
Chelating agent 0.2～0.8
Hydrogen peroxide 3～7
NaOH 1～5.5
Sodium metasilicate 1～6
The magnesium ion 0.03～0.07 of solubility magnesium salts.
Described solubility magnesium salts is a kind of or more than one mixtures in magnesium sulfate, magnesium carbonate, magnesium nitrate, the magnesium acetate.
Described chelating agent is one or more mixtures in diethylene-triamine pentaacetic acid (DTPA), ethylenediamine tetra-acetic acid (EDTA), the citric acid.
Compared with prior art, the present invention has following advantage:
(1) method for bleaching of the present invention, operation is short, cost is low.
(2) method for bleaching of the present invention, bleaching time is short, high efficiency.
(3) method for bleaching of the present invention floats the pulp yield height, and intensity is good, whiteness height, retention of whiteness height, and hygienic quality is good.
(4) method for bleaching of the present invention, the waste water that discharge the bleaching back does not contain Cl
-Ion and other noxious material can be realized the waste water closed circulation, environmentally safe.
The specific embodiment
Following examples are preferred forms of the present invention, and the present invention is not limited only to this.
Embodiment 1
Magnesium sulfate, chelating agent DTPA, hydrogen peroxide, NaOH and sodium metasilicate are joined respectively in the Straw Pulp that concentration is 10% weight, feed the oxygen that pressure is 0.5MPa then, under 110 ℃ temperature, through finishing bleaching in 40 minutes, 88.6%ISO, yield is 90.71%, and indoor placement 1 year is brightness reversion not.Each amounts of components (gram) is as follows:
Over dry Straw Pulp 100
DTPA 0.2
Hydrogen peroxide 3
NaOH 1
Sodium metasilicate 6
The magnesium ion 0.07 of magnesium sulfate.
Embodiment 2
Solubility magnesium salts, chelating agent, hydrogen peroxide, NaOH and sodium metasilicate are joined respectively in the Straw Pulp that concentration is 12% weight, feed the oxygen that pressure is 1.3MPa then, under 60 ℃ temperature, through finishing bleaching in 40 minutes, the gained bleached pulp brightness reaches 85.2%ISO, yield is 92.10%, and indoor placement 1 year is brightness reversion not.Each composition weight (gram) is as follows:
Over dry Straw Pulp 100
DTPA and EDTA each 0.4
Hydrogen peroxide 7
NaOH 5.5
Sodium metasilicate 3
The magnesium ion 0.03 of magnesium nitrate.
Embodiment 3
Magnesium nitrate and magnesium acetate, citric acid, hydrogen peroxide, NaOH and sodium metasilicate are joined respectively in the Straw Pulp that concentration is 12% weight, feed the oxygen that pressure is 0.5MPa then, under 110 ℃ temperature, through finishing bleaching in 40 minutes, the gained bleached pulp brightness reaches 81.6%ISO, yield is 94.22%, and indoor placement 1 year is brightness reversion not.
Each composition weight (gram) is as follows:
Over dry Straw Pulp 100
Citric acid 0.7
Hydrogen peroxide 5
NaOH 4
Sodium metasilicate 1
The magnesium ion of magnesium nitrate and magnesium acetate each 0.03.
Claims (3)
1, a kind of alkaline process method for bleaching of Straw Pulp, it is characterized in that solubility magnesium salts, chelating agent, hydrogen peroxide, NaOH and sodium metasilicate are joined respectively in the Straw Pulp that concentration is 10%～12% weight, feed the oxygen that pressure is 0.5～1.3MPa then, under 60～110 ℃ temperature, finish bleaching through 40～100 minutes, the parts by weight consumption of said components is:
Over dry Straw Pulp 100
Chelating agent 0.2～0.8
Hydrogen peroxide 3～7
NaOH 1～5.5
Sodium metasilicate 1～6
The magnesium ion 0.03～0.07 of solubility magnesium salts.
2, the method for bleaching of alkaline wheat straw pulp according to claim 1 is characterized in that described solubility magnesium salts is a kind of or more than one mixtures in magnesium sulfate, magnesium carbonate, magnesium nitrate, the magnesium acetate.
3, the method for bleaching of alkaline wheat straw pulp according to claim 1 and 2 is characterized in that described chelating agent is one or more mixtures in diethylene-triamine pentaacetic acid (DTPA), ethylenediamine tetra-acetic acid (EDTA), the citric acid.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200510102198 CN1786335A (en) | 2005-12-09 | 2005-12-09 | Process for bleaching wheat straw grass pulp by alkaline method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200510102198 CN1786335A (en) | 2005-12-09 | 2005-12-09 | Process for bleaching wheat straw grass pulp by alkaline method |
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|---|---|
| CN1786335A true CN1786335A (en) | 2006-06-14 |
Family
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200510102198 Pending CN1786335A (en) | 2005-12-09 | 2005-12-09 | Process for bleaching wheat straw grass pulp by alkaline method |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102061638A (en) * | 2010-11-12 | 2011-05-18 | 昆明理工大学 | Process for catalytically bleaching pulp by acetate/persulfate |
| CN103382671A (en) * | 2013-07-29 | 2013-11-06 | 四川理工学院 | Clean pulping technology for high-polymerization-degree bamboo pulp |
| CN103668388A (en) * | 2013-12-27 | 2014-03-26 | 浙江苏泊尔股份有限公司 | Alkaline-resistant blocking solution and blocking method of hard anode oxide film |
| CN110747682A (en) * | 2019-10-08 | 2020-02-04 | 中国宣纸股份有限公司 | Chlorine-free bleaching method for rice paper straw pulp |
-
2005
- 2005-12-09 CN CN 200510102198 patent/CN1786335A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102061638A (en) * | 2010-11-12 | 2011-05-18 | 昆明理工大学 | Process for catalytically bleaching pulp by acetate/persulfate |
| CN102061638B (en) * | 2010-11-12 | 2013-07-10 | 昆明理工大学 | Process for catalytically bleaching pulp by acetate/persulfate |
| CN103382671A (en) * | 2013-07-29 | 2013-11-06 | 四川理工学院 | Clean pulping technology for high-polymerization-degree bamboo pulp |
| CN103668388A (en) * | 2013-12-27 | 2014-03-26 | 浙江苏泊尔股份有限公司 | Alkaline-resistant blocking solution and blocking method of hard anode oxide film |
| CN110747682A (en) * | 2019-10-08 | 2020-02-04 | 中国宣纸股份有限公司 | Chlorine-free bleaching method for rice paper straw pulp |
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