CN1072746A - A kind of method of efficient bleached pulp - Google Patents
A kind of method of efficient bleached pulp Download PDFInfo
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- CN1072746A CN1072746A CN 91111022 CN91111022A CN1072746A CN 1072746 A CN1072746 A CN 1072746A CN 91111022 CN91111022 CN 91111022 CN 91111022 A CN91111022 A CN 91111022A CN 1072746 A CN1072746 A CN 1072746A
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- pulp
- paper pulp
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- bleached pulp
- washing dehydration
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Abstract
The invention provides a kind of method of bleached pulp.This method is made bleaching agent with sulfuric acid, potassium permanganate, calcium hypochlorite, oxalic acid, adds in the paper pulp at different time respectively and stirs, washs, dewaters.Use this method bleached pulp can improve pulp brightness, boost productivity.Be used for paper industry.
Description
The present invention relates to a kind of method for bleaching of paper pulp.
The present association with pulp bleaching in the paper industry generally uses the method and the oxygen bleach method of chlorine bleach.In chloride multistage bleaching, there are two sections to be,, influence the healthy of workman because chlorine leakage usually causes air pollution with chlorine and caustic soda pulp treatment.Its water quality of waste water that paper pulp is discharged through superchlorination and alkali treatment is by severe contamination.The pollution that the oxygen bleach method produces is lighter, but bleaching will be carried out under certain temperature, pressure in this way, and device therefor is because of heatproof, withstand voltage and complicated, cost height.One piece of " bleaching agent that permanganate and reducing substances are formed " patent application was disclosed on April 22nd, 1, it adopts, and potassium permanganate, oxalic acid, oxalic acid are received, manganese sulfate is made bleaching agent, carry out redox reaction, this method does not have air pollution, carries out under condition of normal pressure, its equipment is than simple with oxidizing process, want 3-4 hour but float cotton pulp with this method, float rice straw pulp and want 7 hours, temperature needs the 30-40 degree, it is long to exist the omnidistance time of bleaching, the shortcoming that the power consumption time is long.
The method that the purpose of this invention is to provide a kind of efficient bleached pulp uses this method pollution-free, can reach the effect of four sections bleachings with tri-stage bleaching, thereby improves pulp brightness, improves output, reduces cost.
This method is to adopt following method to realize: wait to float paper pulp and mix with sulfuric acid and potassium permanganate, sulfuric acid accounts for 2,76% of oven dry stock weight, potassium permanganate accounts for 0,55% of oven dry stock weight, the average rate mixing time is at least 25 minutes under the normal temperature, washing dehydration then, paper pulp mixes with calcium hypochlorite again, calcium hypochlorite accounts for 15,5% of oven dry stock weight, temperature 35-45 degree, average rate stirred 90 minutes at least, then washing dehydration, paper pulp mixes with oxalic acid at last, oxalic acid accounts for oven dry stock weight 2,2%, and normal temperature stirred 20 minutes down at least, then washing dehydration.
Paper pulp of the present invention to be floated can be the true qualities sulfate wood pulp.
Use the present technique bleached pulp, device therefor is identical with the method institute use equipment of chlorine bleach paper pulp.
Used sulfuric acid, potassium permanganate, calcium hypochlorite and oxalic acid in this method, wherein the effect of sulfuric acid is the ash that can remove in the paper pulp, as the calcium in the paper pulp, magnesium, receive, potassium, silicon, iron, copper etc.Sulfuric acid and potassium permanganate can make delignified pulp remove the part lignin.Calcium hypochlorite is an oxidant, carries out nucleophilic addition with chromophoric group in the paper pulp, makes the chromophoric group group that becomes colorless, and can further remove lignin.Oxalic acid is reductant, and it is a kind of reduction reaction that this method bleaches pulp bleaching.Float the true qualities sulfate wood pulp with this method and experiment showed, that the whiteness index is apparently higher than the whiteness with other method bleached pulp.This method is through saving one section operation than original with four sections bleachings of chloridizing after the tri-stage bleaching, therefore use 1 less, 5-2 hour, improve production capacity 40%, save 3-4 section operation than the method that proposes in " bleaching agent that potassium permanganate and reducing substances are formed ", bleaching is shortened 3,5 hours, and production capacity significantly improves.The fibre strength damage is light, and fiber loss is few, floats loss rate and has reached the whiteness raising than chloridizing reduction by 4,14-5,73%, and output improves, the goal of the invention that totle drilling cost reduces.Water analysis CODcr374mg/L, BOD
581,47mg/L meets national papermaking B-grade sewage discharge standard.Do not produce air pollution in the technology.
Embodiment 1
Bleach 1 kilogram of common paper pulp, add water 8-10 kilogram, the sulfuric acid 15ml that adds content 5,5g potassium permanganate solution and content 98% at room temperature average rate stirred 25 minutes, then washing dehydration.Add effective chlorine dose 15, the 5g calcium hypochlorite aqueous solution again, temperature 37 degree, average rate stirred 90 minutes, then washing dehydration.Add content 22g oxalic acid liquid at last, average rate stirred 20 minutes under the normal temperature, then washing dehydration.Whiteness can reach more than 80 degree.
Embodiment 2
1 kilogram of bleached sulphate true qualities wood pulp, Kappa number 48,27, fracture length 6466m adds water 8-10 kilogram, adds content 5,5g potassium permanganate solution, adds the sulfuric acid 15ml of content 98%, and at room temperature average rate stirred 40 minutes, then washing dehydration.Add effective chlorine dose 15, the 5g calcium hypochlorite aqueous solution again, temperature 45 degree, average rate stirred 120 minutes, then washing dehydration.Add content 22g oxalic acid liquid at last, average rate stirred 40 minutes under the normal temperature, then washing dehydration.Whiteness can reach more than 70.
Claims (2)
1, a kind of method of efficient bleached pulp, it is characterized in that: wait to float and add 2,76% sulfuric acid and 0.55% potassium permanganate in the paper pulp, normal temperature stirred 25 minutes down at least, and washing dehydration adds 15,5% calcium hypochlorite again in the paper pulp then, temperature 35-45 degree, stirred at least 90 minutes, washing dehydration adds 2.2% oxalic acid in the last paper pulp then, normal temperature stirred 20 minutes down at least, then washing dehydration.
2, according to the method for the said a kind of efficient bleached pulp of claim 1, it is characterized in that: paper pulp to be floated is the true qualities sulfate wood pulps.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 91111022 CN1072746A (en) | 1991-11-20 | 1991-11-20 | A kind of method of efficient bleached pulp |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 91111022 CN1072746A (en) | 1991-11-20 | 1991-11-20 | A kind of method of efficient bleached pulp |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1072746A true CN1072746A (en) | 1993-06-02 |
Family
ID=4910427
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 91111022 Pending CN1072746A (en) | 1991-11-20 | 1991-11-20 | A kind of method of efficient bleached pulp |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1072746A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1055737C (en) * | 1996-01-15 | 2000-08-23 | 南京林业大学 | Prescription and process for intensively bleaching pulp using singlet state oxygen in alkali bleaching stage of multi-stage process |
| US7306698B2 (en) | 2001-03-20 | 2007-12-11 | Biopulping International | Method for producing pulp |
| CN106460343A (en) * | 2014-05-20 | 2017-02-22 | 佐治亚-太平洋消费产品有限合伙公司 | Bleaching and shive reduction process for non-wood fibers |
| US10711399B2 (en) | 2014-05-20 | 2020-07-14 | Gpcp Ip Holdings Llc | Bleaching and shive reduction process for non-wood fibers |
| US10844538B2 (en) | 2014-05-20 | 2020-11-24 | Gpcp Ip Holdings Llc | Bleaching and shive reduction process for non-wood fibers |
-
1991
- 1991-11-20 CN CN 91111022 patent/CN1072746A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1055737C (en) * | 1996-01-15 | 2000-08-23 | 南京林业大学 | Prescription and process for intensively bleaching pulp using singlet state oxygen in alkali bleaching stage of multi-stage process |
| US7306698B2 (en) | 2001-03-20 | 2007-12-11 | Biopulping International | Method for producing pulp |
| CN106460343A (en) * | 2014-05-20 | 2017-02-22 | 佐治亚-太平洋消费产品有限合伙公司 | Bleaching and shive reduction process for non-wood fibers |
| US10640899B2 (en) | 2014-05-20 | 2020-05-05 | Gpcp Ip Holdings Llc | Bleaching and shive reduction process for non-wood fibers |
| US10711399B2 (en) | 2014-05-20 | 2020-07-14 | Gpcp Ip Holdings Llc | Bleaching and shive reduction process for non-wood fibers |
| US10844538B2 (en) | 2014-05-20 | 2020-11-24 | Gpcp Ip Holdings Llc | Bleaching and shive reduction process for non-wood fibers |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C01 | Deemed withdrawal of patent application (patent law 1993) | ||
| WD01 | Invention patent application deemed withdrawn after publication |