CN1847519A - Cotton stalk pulping process with high whiteness of pulp - Google Patents
Cotton stalk pulping process with high whiteness of pulp Download PDFInfo
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- CN1847519A CN1847519A CN 200610075049 CN200610075049A CN1847519A CN 1847519 A CN1847519 A CN 1847519A CN 200610075049 CN200610075049 CN 200610075049 CN 200610075049 A CN200610075049 A CN 200610075049A CN 1847519 A CN1847519 A CN 1847519A
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Abstract
The cotton stalk pulping process with high pulp whiteness includes the following steps: crushing cotton stalk in a peel-stalk separator and eliminating epidermis and pith; boiling crushed material by means of adding lignin decomposing agent and digesting assistant at steam pressure of 0.2-0.85 MPa and temperature of 110-180 deg.c for 35-420 min; chlorinating 1-6 % concentration cotton stalk pulp with chlorine of 1-8 % in the chlorinating section at temperature of 15-45 deg.c; alkali treating 6-15 % concentration cotton stalk pulp with NaOH of 0.5-6 % and H2O2 of 0.5-4.0 % in the alkali treating section at the temperature of 40-75 deg.c; bleaching in the bleaching section with hypochlorite of 0.5-6.0 % and NaOH of 0.5-3.0 %; and final washing and screening. The cotton stalk pulp of the present invention has high whiteness up to 75-85 %, low dust content and high strength, and may be used in making paper.
Description
Technical field
The invention belongs to the method for making paper pulp, particularly improve the pulping process of cotton stalk pulping whiteness.
Background technology
Cotton is the important crops in China's Strategy for economic development, and wide cultivated area is arranged, and agricultural also provides abundant cotton stalk resource in the results cotton.But many places do not utilize cotton stalk in the rural area, and cotton stalk is burned in the field as agricultural residue, abundant cotton stalk resource slatterning in vain.
Cotton stalk is as Angiospermae, the same guiding principle of cotton of dicotyledon and leaf wood, and leaf wood has been widely used in the manufacturing of high yield and chemical pulp as paper making raw material.And cotton stalk is rich in pectin, pigment, slurry and is difficult to bleaching, and existing at present people studies with cotton stalk and produces the high yield pulp or low whiteness chemical pulp the manufacturing paper with pulp with packing board, corrugated paper, brown paper and low-grade toilet paper of not bleaching.
Summary of the invention
The object of the present invention is to provide a kind of pulping process that improves the cotton stalk pulping whiteness, produce with this method that cotton stalk pulping has the whiteness height, dust is few, the characteristics that pulp strength is high can be used for manufacturing paper with pulp of medium-to-high grade cultural paper.
The object of the present invention is achieved like this: a kind of pulping process that improves the cotton stalk pulping whiteness, carry out according to the following steps: 1, with hull rod splitter with cotton stalk fragmentation, remove the outer epidermis of cotton stalk and the marrow of heart portion simultaneously; The cotton stalk raw material that 2, will the be broken digesting apparatus of packing into, add entry and chemicals and carry out boiling, chemicals is lignin distintegrant and digesting assistant, wherein: the weight ratio that adds raw material and water is 1: 1.25-6.0, and adding the lignin distintegrant is the 15.5-40% of raw material weight, adding digesting assistant is the 0.01-3.0% of raw material weight, sulphidity is 15-30%, digestion time is 35-420min, and steam pressure is 0.2-0.85Mpa, and temperature is 110 ℃-180 ℃; 3, wash dissolved impurity in the flush away cotton stem pulp with water; 4, enter the chlorination section, add chlorine in cotton stem pulp to be bleached, the consumption of chlorine is the 1-8% of cotton stem pulp weight, and the concentration of cotton stem pulp is 1-6.0%, and temperature is 15 ℃-45 ℃; 5, enter the alkali treatment section, add NaOH and H
2O
2, wherein the consumption of NaOH is the 0.5-6% of cotton stem pulp weight, H
2O
2Consumption be the 0.5-4.0% of cotton stem pulp weight, cotton stem pulp concentration is 6-15%, temperature is 40 ℃-75 ℃; 6, enter the hypochlorite bleaching section, add hypochlorite and NaOH, wherein the consumption of hypochlorite is the 0.5-6.0% of cotton stem pulp weight, and the consumption of NaOH is the 0.5-3.0% of cotton stem pulp weight; 7, wash with water, enter machine hand's preface then.
The relevant step optimizing technology parameters of above-mentioned pulping process is: the weight ratio that adds raw material and water in the step 2 is 1: 1.3-5.0, adding the lignin distintegrant is the 25-33% of raw material weight, adding digesting assistant is the 0.02-2.5% of raw material weight, sulphidity is 20-25%, digestion time 50-420min, steam pressure 0.5-0.8Mpa, 120 ℃-160 ℃ of temperature; The consumption of chlorine is the 3-6% of cotton stem pulp weight in the step 4, and the concentration of cotton stem pulp is 2-5%, and temperature is 20 ℃-40 ℃; The consumption that adds NaOH in the step 5 is the 3-5% of cotton stem pulp weight, H
2O
2Consumption be the 1-3% of cotton stem pulp weight, cotton stem pulp concentration is 8-14%, temperature is 50 ℃-70 ℃; The consumption that adds hypochlorite in the step 6 is the 2-5% of cotton stem pulp weight, and the consumption that adds NaOH is the 1-2.5% of cotton stem pulp weight.The lignin distintegrant is the A+B composition, and wherein the composition of A is NaOH or CaCO
3, the composition of B is Na
2SO
3Or S
2Or Na
2S or Na
2S
xOr Mg (HSO
3).The composition addition of A is the 15-30% of raw material weight in the lignin distintegrant, and the composition addition of B is the 0.5-10% of raw material weight.When the composition of A is NaOH, the composition of B is Na
2SO
3The time, the addition of NaOH is the 15-30% of raw material weight, Na
2SO
3Addition is the 0.5-10% of raw material weight.
The digesting assistant that adds in the pulping process step 2 of the present invention is green oxygen or anthraquinone.When the digesting assistant that adds was green oxygen, the addition of green oxygen was the 0.01%-0.1% of raw material weight.When the digesting assistant that adds was anthraquinone, the addition of anthraquinone was the 0.1%-2% of raw material weight.Its medium green oxygen is macromolecular compound, does not contain carcinogen, does not cause environmental pollution, and green oxygen boiling can reduce material consumption (caustic soda, imonium, inferior sodium), shortens digestion time, improves pulp yield, intensity and whiteness, is that the green of paper industry helps digesting assistant.The green oxygen that the present invention uses is the transparent liquid of light green.Its production unit: Henan provincial highway purifying worker technology Co., Ltd, the address: Zhengzhou City's culture road No. 128 space flight mansions 15 building A8, postcode: 450003, phone: 0371-63563761～63563766, fax: 0371-63563936.
The technical indicator of the green oxygen of this production of units:
| Model | Outward appearance | Working substance | PH value | Proportion | Storage period |
| 0-2 | The light green transparency liquid | 60±2％ | 1～4 | 1.05～1.10 | 1 year |
| 0-22 | The light green transparency liquid | 60±2％ | 7±1 | 1.05～1.10 | 1 year |
| 0-98 | The light green pressed powder | ≥90％ | 8±1 | 1.10～1.20 | 1 year |
| 0-99 | The light green pressed powder | ≥90％ | 8±1 | 1.10～1.20 | 1 year |
The structure of cotton stalk is made up of five different parts, marrow by outer epidermis, bast fiber, middle part wood fibre and heart portion is formed, the xylem at bast fiber and middle part contains can be by the used fiber of papermaking, and core mainly is that heteroproteose cell is formed, and must remove in pulping process.Outer epidermis contains abundant pectin and pigment, under the alkali condition of long-time high temperature, high pressure, makes lignin and pigment condensation in pulping process, generates the composition that is difficult to bleach.Therefore, in the hull rod splitter crushed cotton stalk, the outer epidermis of cotton stalk and the marrow of heart portion are removed.Because cotton stalk itself contains a certain amount of pectin and pigment, be difficult to the cotton stem pulp material is bleached whiteness more than 60% with traditional bleaching process, and the layer of wood tissue tight of cotton stalk, cooking liquor is difficult for soaking into during slurrying, only takes the long-time heating mode that relaxes, and cooking liquor is soaked into fully, boiling is even like this, the slag rate is low, and screened yield is improved, and the whiteness of slurry bleaching is improved.Through the evidence of multiple boiling mode, adopt the steaming preparation of single component to be difficult to improve pulp yield.Pulping process of the present invention adopts the lignin distintegrant of compound preparation, accounts for the NaOH of raw material weight 15-30% and adds the Na that accounts for raw material weight 0.5-10% as adding
2SO
3Be main delignification reaction agent, reach the purpose of removing lignin, the green oxygen that adding accounts for raw material weight 0.1-3.0% is as digesting assistant, to strengthen delignification reaction and protection raw fiber.Use chlorine, NaOH, H
2O
2As bleaching agent, and adopt corresponding combined bleach technology, the technological parameter of cotton stalk crushing process, digesting technoloy and bleaching process constantly is optimized.Crushing process adopts hull rod splitter to make cotton stalk fragmentation, tear evenly, has improved the expansion of raw material, makes cotton stalk material cooking even.Prolong digestion time, soup can fully be reacted with lignin, thereby reached the purpose of removing lignin, the whiteness of the bleaching cotton stem pulp made from cotton stalk raw material with pulping process of the present invention reaches 75-85%, dust is few, and the pulp strength height can be used for manufacturing paper with pulp of medium-to-high grade cultural paper.
There is abundant cotton stalk resource in China, and because of the value of cotton stalk is low, the cotton grower burns cotton stalk or discard in the field basically, both pollutes, and wastes resource again.Pulping process of the present invention is that the cotton stalk bleaching pulp material that raw material is made can be used for manufacturing paper with pulp of medium-to-high grade cultural paper with cotton stalk, make discarded cotton stalk twice laid on the one hand, make full use of resource, increased cotton grower's income, also solved a paper industry fibrous raw material difficult problem in short supply on the other hand.
The specific embodiment
Embodiment 1, and a kind of pulping process that improves the cotton stalk pulping whiteness carries out according to the following steps: 1, with hull rod splitter with cotton stalk fragmentation, remove the outer epidermis of cotton stalk and the marrow of heart portion simultaneously; The cotton stalk raw material that 2, will the be broken digesting apparatus of packing into adds entry and chemicals and carries out boiling, and chemicals is NaOH, Na
2SO
3With green oxygen, wherein: the weight ratio that adds raw material and water is 1: 5.0, and adding NaOH is 15% of raw material weight, adds Na
2SO
3Be 5% of raw material weight, adding green oxygen is 0.02% of raw material weight, and sulphidity is 20%, and digestion time is 40min, and steam pressure is 0.5Mpa, and temperature is 120 ℃; 3, wash dissolved impurity in the flush away cotton stem pulp with water; 4, enter the chlorination section, add chlorine in cotton stem pulp to be bleached, the consumption of chlorine is 4% of a cotton stem pulp weight, and the concentration of cotton stem pulp is 3%, and temperature is 30 ℃; 5, enter the alkali treatment section, add NaOH and H
2O
2, wherein the consumption of NaOH is 4% of a cotton stem pulp weight, H
2O
2Consumption be 2% of cotton stem pulp weight, cotton stem pulp concentration is 8%, temperature is 50 ℃; 6, enter the hypochlorite bleaching section, add hypochlorite and NaOH, wherein the consumption of hypochlorite is 3% of a cotton stem pulp weight, and the consumption of NaOH is 2% of a cotton stem pulp weight, and the concentration of cotton stem pulp is 10%, and temperature is 40 ℃; 7, wash with water, enter machine hand's preface then.
After testing: its whiteness 80% of cotton stem pulp quality, fracture length 4900m, the dust 532mm that make with pulping process of the present invention
2/ 500g slurry.
Embodiment 2,
Repeat embodiment 1 by described same steps as, but the weight ratio that wherein adds raw material and water in the step 2 is 1: 4, adding NaOH is 25% of raw material weight, adding Na
2SO
3Be 8% of raw material weight, adding anthraquinone is 2.5% of raw material weight, and sulphidity is 25%, digestion time 350min, steam pressure 0.8Mpa, 160 ℃ of temperature; The consumption of chlorine is 6% of a cotton stem pulp weight in the step 4, and the concentration of cotton stem pulp is 4.0%, and temperature is 40 ℃; The consumption that adds NaOH in the step 5 is 5% of a cotton stem pulp weight, H
2O
2Consumption be 3% of cotton stem pulp weight, cotton stem pulp concentration is 12%, temperature is 60 ℃; The consumption that adds hypochlorite in the step 6 is 4% of a cotton stem pulp weight, and the consumption that adds NaOH is 2.5% of a cotton stem pulp weight, and cotton stem pulp concentration is 12%, and temperature is 45 ℃.
After testing: its whiteness 85% of cotton stem pulp quality, fracture length 5979m, the dust 568mm that make with pulping process of the present invention
2/ 500g slurry.
Subordinate list is the cotton stalk bleaching pulp material made with method of the present invention and the contrast of hardwood pulp physical parameter.
| Title | Tear long (m) | Tearability | Folding (inferior) | Fibre length (mm) | ||
| The longest | The shortest | On average | ||||
| Cotton stalk bleaching pulp | 5979 | 373.3 | 106 | 1.35 | 0.61 | 0.93 |
| Hardwood pulp | 3499 | 386.4 | 1.2 | 0.57 | 0.86 | |
Physical parameter from subordinate list contrasts as can be seen, and cotton stalk bleaching pulp average fiber length is 0.93mm, and cotton stalk bleaching pulp fibre strength is higher than hardwood pulp, and cotton stem pulp can be used for manufacturing paper with pulp of medium-to-high grade cultural paper by the instead of part wood pulp.
The manufacture paper with pulp index of quality of paper pulp of medium-to-high grade cultural paper, whiteness 76%, fracture length: greater than 4000m, dust: be not more than 1000mm
2/ 500g slurry.
With the cotton stalk bleaching pulp that pulping process of the present invention is made, every after tested index of quality has all satisfied the pulp quality requirement of producing medium-to-high grade cultural paper.
Claims (8)
1, a kind of pulping process that improves the cotton stalk pulping whiteness is characterized in that: carry out according to the following steps: (1), with hull rod splitter with cotton stalk fragmentation, remove the outer epidermis of cotton stalk and the marrow of heart portion simultaneously; The cotton stalk raw material that (2), will the be broken digesting apparatus of packing into, add entry and chemicals and carry out boiling, chemicals is lignin distintegrant and digesting assistant, wherein: the weight ratio that adds raw material and water is 1: 1.25-6.0, and adding the lignin distintegrant is the 15.5-40% of raw material weight, adding digesting assistant is the 0.01-3% of raw material weight, sulphidity is 15-30%, digestion time is 35-420min, and steam pressure is 0.2-0.85Mpa, and temperature is 110 ℃-180 ℃; (3), wash dissolved impurity in the flush away cotton stem pulp with water; (4), enter the chlorination section, in cotton stem pulp to be bleached, add chlorine, the consumption of chlorine is the 1-8% of cotton stem pulp weight, the concentration of cotton stem pulp is 1-6.0%, temperature is 15 ℃-45 ℃; (5), enter alkali treatment section, adding NaOH and H
2O
2, wherein the consumption of NaOH is the 0.5-6% of cotton stem pulp weight, H
2O
2Consumption be the 0.5-4.0% of cotton stem pulp weight, cotton stem pulp concentration is 6-15%, temperature is 40 ℃-75 ℃; (6), enter the hypochlorite bleaching section, add hypochlorite and NaOH, wherein the consumption of hypochlorite is the 0.5-6.0% of cotton stem pulp weight, the consumption of NaOH is the 0.5-3.0% of cotton stem pulp weight; (7), wash with water, enter machine hand's preface then.
2, the pulping process of raising cotton stalk pulping whiteness according to claim 1, it is characterized in that: the weight ratio that adds raw material and water in the step (2) is 1: 1.3-5.0, adding the lignin distintegrant is the 25-33% of raw material weight, adding digesting assistant is the 0.02-2.5% of raw material weight, sulphidity is 20-25%, digestion time 50-420min, steam pressure 0.5-0.8Mpa, 120 ℃-160 ℃ of temperature; The consumption of chlorine is the 3-6% of cotton stem pulp weight in the step (4), and the concentration of cotton stem pulp is 2-5%, and temperature is 20 ℃-40 ℃; The consumption that adds NaOH in the step (5) is the 3-5% of cotton stem pulp weight, H
2O
2Consumption be the 1-3% of cotton stem pulp weight, cotton stem pulp concentration is 8-14%, temperature is 50 ℃-70 ℃; The consumption that adds hypochlorite in the step (6) is the 2-5% of cotton stem pulp weight, and the consumption that adds NaOH is the 1-2.5% of cotton stem pulp weight.
3, the pulping process of raising cotton stalk pulping whiteness according to claim 1 and 2 is characterized in that: the lignin distintegrant is the A+B composition, and wherein the composition of A is NaOH or CaCO
3, the composition of B is Na
2SO
3Or S
2Or Na
2S or Na
2S
XOr Mg (HSO
3).
4, the pulping process of raising cotton stalk pulping whiteness according to claim 3 is characterized in that: the composition addition of A is the 15-30% of raw material weight in the lignin distintegrant, and the composition addition of B is the 0.5-10% of raw material weight.
5, according to the pulping process of claim 3 or 4 described raising cotton stalk pulping whiteness, it is characterized in that: the composition of A is NaOH, and its addition is the 15-30% of raw material weight, and the composition of B is Na
2SO
3, its addition is the 0.5-10% of raw material weight.
6, the pulping process of raising cotton stalk pulping whiteness according to claim 1 and 2 is characterized in that: digesting assistant is green oxygen or anthraquinone.
7, the pulping process of raising cotton stalk pulping whiteness according to claim 6 is characterized in that: the addition of green oxygen is the 0.01%-0.1% of raw material weight.
8, the pulping process of raising cotton stalk pulping whiteness according to claim 6 is characterized in that: the addition of anthraquinone is the 0.1%-2% of raw material weight.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200610075049 CN1847519A (en) | 2006-03-30 | 2006-03-30 | Cotton stalk pulping process with high whiteness of pulp |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200610075049 CN1847519A (en) | 2006-03-30 | 2006-03-30 | Cotton stalk pulping process with high whiteness of pulp |
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| Publication Number | Publication Date |
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| CN1847519A true CN1847519A (en) | 2006-10-18 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110359312A (en) * | 2014-05-20 | 2019-10-22 | Gpcp知识产权控股有限责任公司 | The bleaching and clast reduction method of non-wood-fiber |
-
2006
- 2006-03-30 CN CN 200610075049 patent/CN1847519A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110359312A (en) * | 2014-05-20 | 2019-10-22 | Gpcp知识产权控股有限责任公司 | The bleaching and clast reduction method of non-wood-fiber |
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