CN1182148A - Digestion-less and sieving-free chemical pulp-making method producing no nuisance - Google Patents
Digestion-less and sieving-free chemical pulp-making method producing no nuisance Download PDFInfo
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- CN1182148A CN1182148A CN 96120615 CN96120615A CN1182148A CN 1182148 A CN1182148 A CN 1182148A CN 96120615 CN96120615 CN 96120615 CN 96120615 A CN96120615 A CN 96120615A CN 1182148 A CN1182148 A CN 1182148A
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Abstract
The present invention relates to paper making technology and the chemical wheat straw pulp-making processes include: cutting wheat straw into certain size, wind dedusting, dedusting with NaOH solution of 1 mo1/L concentration, crushing wheat straw to shreds, bleaching with hypochlorous acid or hypochlorite, 1 mol/L concentration NaOH solution treatment to neutralize to pH 8-9 when pH is 5-6 and degree of bleaching is 85-90%, grinding into paper pulp, removing impurity and re-bleaching with hypochlorous acid or hypochlorite and water washing to obtain paper pulp.
Description
The present invention relates to the light industry pulping technology for paper-making, specifically refer to use a kind of digestion-less and sieving-free chemical pulp-making method producing no nuisance of ryegrass pulping.
Generally all be under high temperature, high pressure, to produce in the method for continuing to use in the existing light industry paper-making pulping, wherein produce paper per ton and need use about 1 ton of 30% NaOH, also need use anthraquinone in addition, have a large amount of black liquor contaminated environment to occur in the production accordingly.
The object of the present invention is to provide a kind of digestion-less and sieving-free chemical pulp-making method producing no nuisance that uses ryegrass pulping.This method and the existing alkaline process of being continued to use, sulphite, sulfate, imonium and other pulping process are compared, it has non-evaporating boiling, sieving-free, no High Temperature High Pressure, no black liquor discharging, the industrial water closed cycle is used, free from environmental pollution, thoroughly the existing pulping process of radical cure discharges the characteristics of black liquor to the pollution problems that environment caused.
The main technique flow process of ryegrass pulping digestion-less and sieving-free chemical pulp-making method producing no nuisance provided by the present invention comprises: handle in blank dedusting, alkali lye dedusting, corase grind, bleaching, the alkali lye, the correct grinding removal of impurities, float again, wash paper pulp.
Wherein concrete technology is: employed wheat straw is cut into certain specification through chaffcutter, the wind-force dedusting, use the NaOH solution dedusting of 1mol/L again, roughly grind then thread, with the bleaching of hypochlorous acid or its salt, when the bleaching degree is 85-90% when PH is 5-6, in the NaOH solution-treated with 1mol/l, degree of neutralization is PH8-9, finish grindes to paper pulp again, removal of impurities, with the bleaching of hypochlorous acid or its salt float again, wash paper pulp.
Wherein said blank length is 16-20mm;
The hypochlorous acid of the consumption of bleaching employed hypochlorous acid or its salt the wherein said first time or electrolysis prepared with 540 kilograms of chlorine or its salt bleaching time: 8-24 hour for paper pulp per ton approximately; Bleaching concentration: 20/L (effective chlorine);
The consumption of bleaching employed hypochlorous acid or its salt the wherein said second time for paper pulp per ton approximately with 60 kilograms bleach with hypochlorous acid or its salt; Bleaching time: 1-3 hour; Bleaching concentration: 20/L (effective chlorine);
Temperature generally is controlled at 40-60 ℃ in the production procedure of the present invention in addition;
Other technical indicator of product of the present invention is: the refining yield: 50～60%, ton slurry water: 50m
3, ton slurry consumption chlorine: 600kg (conversion), ton starch and use alkali: 30L (30%).
The present invention causes in thorough radical cure pulping process black liquor to the pollution problem of environment, thoroughly solve the pollution difficult problem of black liquor of pulp making to environment, adopt non-evaporating boiling, sieving-free, the two methods of floating of the two mills of two alkali, thoroughly effected a radical cure the problem of the black liquor environmental pollution that is produced in the pulping process, and useless bleaching liquor, middle section water, alkali dedusting liquid recycle all.
Therefore the present invention have non-evaporatingly boil, sieving-free, no black liquor produces, industrial water is realized the closed cycle use, using water wisely, energy savings, free from environmental pollution, nuisanceless, the fibre length of its paper pulp and pulling force all are higher than the characteristics of soda pulp
Various chemical raw materials wherein used in the present invention role in pulping process is: wheat straw is cut into the raw material of certain specification through chaffcutter, through the wind-force dedusting, remove dust, the awn of wheat and other foreign material are removed the material that the intrinsic fatty wax of the dust that attaches on wheat straw and wheat straw itself, pectin, starch etc. influence bleaching speed through alkali lye again; Alkali lye can make the wheat straw suction softening as scale remover, bleeding agent, softening agent, does not damage fiber during with the assurance corase grind, improves bleaching speed, the length of protection fiber, and pulling force prevents the decomposition of half fiber.In order to discongest, protect fiber better, damage fiber when preventing to finish grind, must adding alkali, that fiber is carried out secondary is softening and discongest, and it has been that effect is discongested in catalysis that secondary adds alkali; The correct grinding back prevents that in order to obtain bleaching all even qualified paper pulp paper defects from occurring, and must float again, thoroughly stops the appearance and the generation of paper defects.The used bleaching liquid of the present invention is hypochlorous acid and its esters, as calcium hypochlorite or clorox, alkali is highly basic, whole process of production is not used rotary spherical digester and other firing equipment, exempts screening process, adopts two alkali, two mill, two new technology of floating, realize that no black liquor produces and discharging in the pulping process, produce and use bleaching liquor, water all recycles, and has really realized nuisancelessization of slurrying.
The handled raw material of the present invention is not limited only to wheat straw, and other the raw material that can be used in the production straw pulp is all suitable equally, as reed pulp, wood pulp or the like.
Claims (6)
1, digestion-less and sieving-free chemical pulp-making method producing no nuisance, comprising: employed wheat straw is cut into certain specification through chaffcutter, and the NaOH solution dedusting of 1mol/L is used in the wind-force dedusting again, roughly grind thread then, with hypochlorous acid or the bleaching of its salt, when PH5-6, the bleaching degree is 85-90%, NaOH solution-treated with 1mol/L, degree of neutralization is that PH8-9 finish grindes to paper pulp again, removal of impurities, with the bleaching of hypochlorous acid or its salt float again, wash paper pulp.
2, the described digestion-less and sieving-free chemical pulp-making method producing no nuisance of claim 1, wherein said blank length is 16-20mm.
3, the described digestion-less and sieving-free chemical pulp-making method producing no nuisance of claim 1, the consumption of bleaching employed hypochlorous acid or its salt the wherein said first time for paper pulp per ton approximately prepared or electrolysis with 540 kilograms of chlorine with hypochlorous acid or its salt; Bleached bleaching time: 8-24 hour; Bleaching concentration: 20/L (effective chlorine).
4, the described digestion-less and sieving-free chemical pulp-making method producing no nuisance of claim 1, the consumption of bleaching employed hypochlorous acid or its salt the wherein said second time for paper pulp per ton approximately with 60 kilograms of chlorine made 5 fully or electrolysis with hypochlorous acid or its salt; Bleached bleaching time: 1-3 hour; Bleaching concentration: 20/L (effective chlorine).
5, the described digestion-less and sieving-free chemical pulp-making method producing no nuisance of claim 1, wherein temperature generally is controlled at 40-60 ℃ in the production procedure.
6, the described digestion-less and sieving-free chemical pulp-making method producing no nuisance of claim 1, wherein technical requirement is the refining yield: 50～60%, ton slurry water: 50m
3, ton slurry consumption chlorine: 600kg (conversion), ton starch and use alkali: 30L (30%).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 96120615 CN1182148A (en) | 1996-11-08 | 1996-11-08 | Digestion-less and sieving-free chemical pulp-making method producing no nuisance |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 96120615 CN1182148A (en) | 1996-11-08 | 1996-11-08 | Digestion-less and sieving-free chemical pulp-making method producing no nuisance |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1182148A true CN1182148A (en) | 1998-05-20 |
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ID=5126457
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 96120615 Pending CN1182148A (en) | 1996-11-08 | 1996-11-08 | Digestion-less and sieving-free chemical pulp-making method producing no nuisance |
Country Status (1)
| Country | Link |
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| CN (1) | CN1182148A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1296556C (en) * | 2005-05-30 | 2007-01-24 | 刘长如 | Fast enviornment protection cold soaking pulping process with broad-leaved wood material |
| WO2016106473A1 (en) * | 2014-12-31 | 2016-07-07 | 沈爱云 | Pulp made using spirogyra and preparation method therefor |
| CN110219192A (en) * | 2019-06-13 | 2019-09-10 | 梅州市环源再生资源开发利用有限公司 | A kind of method of rapidly extracting plant fiber production paper pulp |
-
1996
- 1996-11-08 CN CN 96120615 patent/CN1182148A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1296556C (en) * | 2005-05-30 | 2007-01-24 | 刘长如 | Fast enviornment protection cold soaking pulping process with broad-leaved wood material |
| WO2016106473A1 (en) * | 2014-12-31 | 2016-07-07 | 沈爱云 | Pulp made using spirogyra and preparation method therefor |
| CN110219192A (en) * | 2019-06-13 | 2019-09-10 | 梅州市环源再生资源开发利用有限公司 | A kind of method of rapidly extracting plant fiber production paper pulp |
| CN110219192B (en) * | 2019-06-13 | 2020-09-25 | 梅州市环源再生资源开发利用有限公司 | Method for producing paper pulp by quickly extracting plant fibers |
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