CN101613976B - Method for preparing bleached chemi-mechanical pulp by using whole straw of mulberry tree branch - Google Patents
Method for preparing bleached chemi-mechanical pulp by using whole straw of mulberry tree branch Download PDFInfo
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Abstract
The invention discloses a method for preparing bleached chemi-mechanical pulp by using a whole straw of a mulberry tree branch, which comprises presteaming, two sections of screw extrusion, two sections of chemical impregnation, high-consistency double-screw pulp refining, high-consistency residence, middle-consistency pulp refining and other working sections. The method is based on the raw material characteristics of the whole straw of the mulberry tree branch, gradually removes most of non-fiber components in the mulberry tree branch unfavorable for pulp refining, maintains fiber components as much as possible and reduces unfavorable factors to subsequent pulp refining and bleaching caused by the non-fiber components; chlorine containing bleaching agents are not used in the pulp refining process, so that the environment is protected; in addition, the obtained paper pulp has high yield, good physical strength and excellent optical property, and the cleaning and high-efficiency pulp refining of the whole straw of the mulberry tree branch is achieved. The method has the characteristics of simple process flow, less investment, environment-friendly pulp refining process and the like, and has better economic benefit and social benefit and wide popularization value.
Description
Technical field
The invention belongs to the pulping technique by chemical-mechanical method field, particularly a kind of technology of utilizing the whole straw of mulberry tree branch preparing bleached chemi-mechanical pulp.
Background technology
China is the production and consumption big country of paper and cardboard, the output of paper and cardboard and consumption figure Jun Ju second place of the world.But China is again the serious deficient country of wood fibre resource.For a long time, because the deficiency of wood pulp, caused the quality of China's paper, cardboard and paper products low, acute structural imbalance, and drug on the market for low-grade paper, and high-grade paper insufficiency of supply-demand is bigger, some high-grade cultures are with the import of having to rely in a large number of paper, high-grade package paper and paper products, every year must be from a large amount of commercial wood pulp of external import, and since two thousand two, the wood pulp import volume of China is sure to occupy the No. 1 in the world always.Along with the reinforcement of the whole world to ecological environmental protection, the cost of timber and products thereof import can be more and more higher, and maintaining sustained and rapid growth of pulp inlet and goods thereof badly influenced the security and the sound development of China's paper industry in recent years.Therefore, how to utilize the existing wood fibre resource of China fully efficiently, make great efforts the proportion of the lignocellulose raw material of raising paper industry, become the common recognition of China's pulping and paper-making industry.
Mulberry tree is the deciduous tree of Moraceae Morus, is perennial phreatophyte.Because mulberry tree is strong to soil and climate adaptability, the characteristics such as (annual growth secondaries) that have that growth is fast, picking time is short, output is high are one of seeds of China's each department mulberry sericulture base kind commerial growing always.According to statistics, total cultivated area of the present mulberry tree of China is near 1,000,000 hectares.Characteristic and purposes based on growing of mulberry, people have limit more all the year round flourishing in order to keep mulberry tree, all need every year mulberry tree is pruned integer 1 ~ 2 time, thereby a large amount of mulberry branch is all produced in the Sang Yangcan base every year, about about 7000 of Ramulus Mori can be cut in general one mu of mulberry field, weight is about 700 kilograms, can extrapolate China mulberry sericulture base thus and can produce total amount present every year and be approximately mulberry branch about 1,000 ten thousand tons.But all the time, Ramulus Mori all mainly is to act as a fuel or directly stack to rot in the rural area, and this has not only caused the great wasting of resources, has also brought pollution to environment simultaneously.Therefore, how rational and efficient use Ramulus Mori resource becomes one of Sang Yangcan area urgent problem.The Ramulus Mori raw material is applied to pulping and paper-making fully effectively,, improves China's papermaking material structure, improve slurry paper product quality, caused the great attention of China's papermaking industry to increase silkworm raiser's income.
The papermaker of China has also done some pulp-making research to Ramulus Mori at present, but the part that all comes with some shortcomings." Ramulus Mori be stored in pulping and paper-making performance " literary composition of delivering as the 65th page of " Chinese papermaking " the 1st phase of calendar year 2001, introduced Jiangxi Province light industry research institute carries out slurrying with Ramulus Mori research, but what this research was adopted is chemical pulping technology, chemical pulping has its intrinsic defective, mainly show the chemicals usage height, the yield of paper pulp is low, and pollutional load is big, wastewater treatment difficulty etc.In addition, a disclosed patent of invention on January 12nd, 2005 " a kind of is the papermaking process of raw material with Ramulus Mori ", this patent technological process is: Ramulus Mori-pulverizing-scurf removing-bleach-pull an oar-copy paper.This method at first is ground into Ramulus Mori 20-60 purpose Ramulus Mori bits, removes scurf afterwards and bleaches slurrying again.Because this method is ground into 20-60 purpose Ramulus Mori bits to Ramulus Mori earlier, crushing process will inevitably cause a large amount of cut-outs to the Ramulus Mori fiber; In addition, removed paper mulberry bark in the pulping process in this method, and paper mulberry bark is a kind of good bast fiber, this not only causes the waste of high-quality fiber, finally also must reduce the physical strength of pulping; In addition, this method has only been utilized 20-60 purpose Ramulus Mori bits, has in fact just only utilized the part xylem of Ramulus Mori, but not full stalk slurrying is lower to the utilization rate of Ramulus Mori, does not realize fully effectively utilizing of fibrous raw material, therefore, this method still exists many deficiencies to have much room for improvement.Therefore, continue to research and develop out and rationally efficiently utilize the slurrying new technology of Ramulus Mori to still have bigger realistic meaning.
Summary of the invention
The objective of the invention is provides a kind of method of utilizing the full bar preparing bleached chemi-mechanical pulp of Ramulus Mori in order to overcome in the prior art defective such as the low and product adaptation narrow range of Ramulus Mori utilization rate, can efficiently utilize whole straw of mulberry tree branch to produce bleached chemi-mechanical pulp.
Technical scheme of the present invention is, a kind of method of utilizing the full bar preparing bleached chemi-mechanical pulp of Ramulus Mori, and step is:
(1) preparation of Ramulus Mori raw material: whole straw of mulberry tree branch after chipping, advanced row filter, washing, to remove impurity such as silt, the wood chip after the washing soaks again, the time is 4～12 hours, so that the moisture content of Ramulus Mori wood chip is even;
(2) presteaming: carry out presteaming under Ramulus Mori wood chip 1 atmospheric pressure to step (1) processing, the structure of wood chip is softened.Condition is: temperature is 100～105 ℃, and the time is 10～30 minutes;
(3) I section screw extrusion: the employing compression ratio is that the material that the twin (double) screw extruder of 4～6: 1 (volume ratio) is handled step (2) pushes, make the effect of being squeezed of wood chip structure and tear distortion, promote the soup of subsequent chemistry processing procedure to absorb, remove non-fibre fractionations such as most of Ramulus Mori epidermis and marrow core simultaneously;
(4) I section chemical impregnation: the material that adding metal ion chelation agent and NaOH are handled step (3) carries out Chemical Pretreatment.Treatment conditions are: the metal ion chelation agent consumption accounts for 0.2～0.6% of over dry Ramulus Mori chip quality, sodium hydroxide concentration accounts for 1～3% of over dry Ramulus Mori chip quality, dipping concentration is 25～35%, and dipping temperature is 70～90 ℃, and dip time is 15～60 minutes.Described transition metal chelator is diethylene triamine pentacetic acid (DTPA) five sodium (DTPA);
(5) II section screw extrusion: the employing compression ratio is that the material after the twin (double) screw extruder of 4～6: 1 (volume ratio) is handled step (4) pushes, removal is through DTPA chelated metal ion and alkali extractive, to reduce the adverse effect that such material brings follow-up paper pulp alkaline hydrogen peroxide bleaching;
(6) II section chemical impregnation: the material after with the alkaline hydrogen peroxide bleaching soup step (5) being handled carries out the chemical treatment of II section.Treatment conditions are: hydrogen peroxide consumption 4～10% (to the over dry material), sodium hydroxide concentration 3～8% (to the over dry material), DTPA consumption 0.2～0.6% (to the over dry material), sodium metasilicate consumption 2～5% (to the over dry material), dipping concentration is 25～35%, dipping temperature is 40～50 ℃, and dip time is 15～60 minutes;
(7) first sections defibrinations: the material after with double-screw pulp-milling (6) being handled carries out high dense normal pressure defibrination, and the defibrination process is without thin up.Refining concentration is 20～40%.
(8) high dense stop: not additionally heating, make full use of the heat energy that produces in the defibrination process, make the slurry after step (7) is handled in the dense reserving tower of height, finish bleaching action.Stopping the reaction time is 60～120 minutes, and the temperature of reaction is that 85～90 ℃, reaction end pH value are 8.5～9.5;
(9) dense mill was milled to the paper pulp of the required Canadian freedom of final paper product during the slurry after step (8) is handled was used, and refining concentration is 8～12%.The mill disposed slurry is latent through disappearing, washing, screening, and last pulping places storage slurry tower.
Principle of the present invention is as follows: because whole straw of mulberry tree branch contains the epidermis and the marrow core of non-fibre fractionation, and these two kinds of components all are difficult to handle.Present technique is from the configuration of technical process and equipment, the incremental formula of material ground is carried out step process such as the chemical impregnation of presteaming, extruding and tearing, different modes and defibrination, whole process is before the bleaching pulping, remove as much as possible in most of Ramulus Mori wood chip the disadvantageous non-fibre fractionation of slurrying, kept its fibre fractionation as far as possible, can reduce the unfavorable factor that non-fibre fractionation is brought follow-up pulping bleaching, realize the efficient bleaching of paper pulp and keep high yield.In addition, after first section defibrination of this technology places material and chemicals that reaction is fully arranged, can reduce the transition damage of Ramulus Mori fiber in the defibrination process, make pulping have good physical strength performance.
Beneficial effect is:
1. pulping process is according to the characteristics of whole straw of mulberry tree branch raw material, progressively removed in most of whole straw of mulberry tree branch the disadvantageous non-fibre fractionation of slurrying, kept its fibre fractionation as far as possible, reduced the unfavorable factor that non-fibre fractionation is brought follow-up pulping bleaching, required chemicals usage when not only having kept the high yield of slurrying but also can reduce paper pulp floating to the same target whiteness;
2. pulping process energy-conserving and environment-protective.What technical process adopted is the chemicals comparatively friendly to environment, and pulping process pollutes few; Bleaching action is external heat source not, makes full use of the heat energy that the defibrination process produces;
3. the paper pulp yield that utilizes whole straw of mulberry tree branch to make can reach more than 82%, and tensile strength can reach more than the 35N.m/g, and whiteness can reach more than the 73%ISO, has realized the full stalk clean and effective utilization of Ramulus Mori.
The specific embodiment
Through the advanced row filter of the Ramulus Mori material of section, washing, soak, carry out the normal pressure presteaming then, material after the decatize carries out I section extruding and tearing with twin (double) screw extruder, add metal ion chelation agent and caustic soda then material is carried out I section Chemical Pretreatment, material after the processing carries out the extruding of II section with twin (double) screw extruder again, material after the extruding carries out II section chemical impregnation with the alkaline hydrogen peroxide bleaching soup again, material behind the dipping carries out first section high dense normal pressure defibrination with double-screw pulp-milling, the mill disposed slurry is finished bleaching action in the dense reserving tower of height, finish behind the bleaching action slurry again with in dense mill be milled to the required Canadian freedom paper pulp of final paper product, it is latent to disappear then, washing, screening, last pulping.
Below in conjunction with embodiment the present invention is described in further detail.
Embodiment 1:
Whole straw of mulberry tree branch is through after chipping, screen, washing, in water, soaked 10～12 hours, use 100～105 ℃ of steam, 1 atmospheric pressure decatize 15min then, wood chip after the decatize is with compression ratio 4～6: the twin (double) screw extruder of 1 (volume ratio) carries out I section extruding and tearing, material after the extruding and tearing carries out I section Chemical Pretreatment, treatment conditions are: DTPA consumption 0.3% (to over dry Ramulus Mori wood chip), sodium hydroxide concentration 2.0% (to over dry Ramulus Mori wood chip), dipping concentration is 30%, dipping temperature is 75 ℃, and dip time is 30 minutes.Material after the chemical treatment is used compression ratio 4～6 again: the twin (double) screw extruder of 1 (volume ratio) carries out the extruding of II section, and the material after the extruding of II section carries out the chemical treatment of II section with the alkaline hydrogen peroxide bleaching soup again.Treatment conditions are: hydrogen peroxide consumption 6.0% (to over dry Ramulus Mori wood chip), sodium hydroxide concentration 3.0% (to over dry Ramulus Mori wood chip), DTPA consumption 0.2% (to over dry Ramulus Mori wood chip), sodium metasilicate consumption 3.0% (to the over dry material), dipping concentration is 30%, dipping temperature is 50 ℃, and dip time is 15 minutes; Material after the chemical treatment of II section carries out first section high dense normal pressure defibrination with double-screw pulp-milling, and refining concentration is 30%; The mill disposed slurry utilizes the heat energy that produces in the defibrination process to finish bleaching action in the dense reserving tower of height.The temperature of reaction is 86～89 ℃, stop the reaction time is that 75 minutes, reaction end pH value are 8.95; Finish slurry behind the bleaching action be mixed with 10% slurry dense after, again with in dense mill to be milled to Canadian freedom be paper pulp about 200mLCSF, latent, the washing of disappearing then, screening, last pulping.Pulp quality is: paper pulp yield 83.5%, tensile strength 36.8N.m/g, whiteness 73.6%ISO.
Embodiment 2:
Whole straw of mulberry tree branch is through after chipping, screen, washing, in water, soaked 10～12 hours, use 100～105 ℃ of steam normal pressure decatize 15min then, wood chip after the decatize is with compression ratio 4～6: the twin (double) screw extruder of 1 (volume ratio) carries out I section extruding and tearing, material after the extruding and tearing carries out I section Chemical Pretreatment, treatment conditions are: DTPA consumption 0.4% (to the over dry quality of material), sodium hydroxide concentration 2.0% (to the over dry quality of material), dipping concentration is 30%, dipping temperature is 75 ℃, and dip time is 30 minutes.Material after the chemical treatment is used compression ratio 4～6 again: the twin (double) screw extruder of 1 (volume ratio) carries out the extruding of II section, and the material after the extruding carries out II section chemical impregnation with the alkaline hydrogen peroxide bleaching soup again.Immersion condition is: hydrogen peroxide consumption 8.0% (to the over dry material), sodium hydroxide concentration 3.0% (to the over dry material), DTPA consumption 0.3% (to the over dry material), sodium metasilicate consumption 4% (to the over dry material), dipping concentration is 30%, and dipping temperature is 50 ℃, and dip time is 15 minutes; Material behind the dipping carries out first section high dense normal pressure defibrination with double-screw pulp-milling, and refining concentration is 30%; The mill disposed slurry utilizes the heat energy that produces in the defibrination process to finish bleaching action in the dense reserving tower of height, and 88～93 ℃ of the temperature of reaction, to stop the reaction time be that 90 minutes, reaction end pH value are 9.28; Finishing slurry behind the bleaching action, to be mixed with 10% slurry dense, again with in dense mill to be milled to Canadian freedom be paper pulp about 200mLCSF, latent, the washing of disappearing then, screening, last pulping.Pulp quality is: paper pulp yield 82.8%, tensile strength 40.5N.m/g, whiteness 76.3%ISO.
Embodiment 3
A kind of method of utilizing the full bar preparing bleached chemi-mechanical pulp of Ramulus Mori, step is:
(1) preparation of Ramulus Mori raw material: whole straw of mulberry tree branch after chipping, advanced row filter, washing, to remove impurity such as silt, the wood chip after the washing soaks again, the time is 4～10 hours, so that the moisture content of Ramulus Mori wood chip is even;
(2) presteaming: carry out presteaming under Ramulus Mori wood chip 1 atmospheric pressure to step (1) processing, the structure of wood chip is softened.Condition is: temperature is 100～105 ℃, and the time is 30 minutes;
(3) I section screw extrusion: the employing compression ratio is that the material that the twin (double) screw extruder of 4～6: 1 (volume ratio) is handled step (2) pushes, make the effect of being squeezed of wood chip structure and tear distortion, promote the soup of subsequent chemistry processing procedure to absorb, remove non-fibre fractionations such as most of Ramulus Mori epidermis and marrow core simultaneously;
(4) I section chemical impregnation: the material that adding metal ion chelation agent and NaOH are handled step (3) carries out Chemical Pretreatment.Treatment conditions are: the metal ion chelation agent consumption accounts for 0.6% of over dry Ramulus Mori chip quality, and sodium hydroxide concentration accounts for 3% of over dry Ramulus Mori chip quality, and dipping concentration is 35%, and dipping temperature is 90 ℃, and dip time is 60 minutes.Described transition metal chelator is diethylene triamine pentacetic acid (DTPA) five sodium (DTPA);
(5) II section screw extrusion: the employing compression ratio is that the material after the twin (double) screw extruder of 4～6: 1 (volume ratio) is handled step (4) pushes, removal is through DTPA chelated metal ion and alkali extractive, to reduce the adverse effect that such material brings follow-up paper pulp alkaline hydrogen peroxide bleaching;
(6) II section chemical impregnation: the material after with the alkaline hydrogen peroxide bleaching soup step (5) being handled carries out the chemical treatment of II section.Treatment conditions are: hydrogen peroxide consumption 4% (to the over dry material), sodium hydroxide concentration 3% (to the over dry material), DTPA consumption 0.2% (to the over dry material), sodium metasilicate consumption 2% (to the over dry material), dipping concentration is 35%, and dipping temperature is 50 ℃, and dip time is 60 minutes;
(7) first sections defibrinations: the material after with double-screw pulp-milling (6) being handled carries out high dense normal pressure defibrination, and the defibrination process is without thin up.Refining concentration is 40%.
(8) high dense stop: not additionally heating, make full use of the heat energy that produces in the defibrination process, make the slurry after step (7) is handled in the dense reserving tower of height, finish bleaching action.Stopping the reaction time is 120 minutes, and the temperature of reaction is that 85～90 ℃, reaction end pH value are 8.5～9.5;
(9) dense mill was milled to the required Canadian freedom paper pulp of final paper product during the slurry after step (8) is handled was used, and refining concentration is 12%.The mill disposed slurry is latent through disappearing, washing, screening, and last pulping places storage slurry tower.
Claims (3)
1. a method of utilizing the whole straw of mulberry tree branch preparing bleached chemi-mechanical pulp is characterized in that, step is:
The first step, the preparation of Ramulus Mori raw material: whole straw of mulberry tree branch after chipping, advanced row filter, washing, the chip impregnation after the washing 4～12 hours;
In second step, presteaming: the Ramulus Mori wood chip that the first step is handled carried out presteaming 10～30 minutes under 1 atmospheric pressure, 100～105 ℃;
In the 3rd step, I section screw extrusion: the material that adopts twin (double) screw extruder that second step was handled pushes;
The 4th step, I section chemical impregnation: add metal ion chelation agent and NaOH the 3rd material that goes on foot processing is carried out Chemical Pretreatment, treatment conditions are: the metal ion chelation agent consumption accounts for 0.2～0.6% of over dry Ramulus Mori chip quality, sodium hydroxide concentration accounts for 1～3% of over dry Ramulus Mori chip quality, dipping concentration is 25～35%, dipping temperature is 70～90 ℃, and dip time is 15～60 minutes;
The 5th step, II section screw extrusion: adopt the material after twin (double) screw extruder was handled the 4th step to push;
The 6th step, II section chemical impregnation: the 5th material that goes on foot after handling is carried out the chemical treatment of II section with the alkaline hydrogen peroxide bleaching soup, treatment conditions are: the hydrogen peroxide consumption is to account for 4～10% of over dry quality of material, sodium hydroxide concentration accounts for 3～8% of over dry quality of material, the metal ion chelation agent consumption accounts for 0.2～0.6% of over dry quality of material, the sodium metasilicate consumption accounts for 2～5% of over dry quality of material, dipping concentration is 25～35%, dipping temperature is 40～50 ℃, and dip time is 15～60 minutes;
In the 7th step, first section defibrination: with double-screw pulp-milling the 6th material that goes on foot after handling is carried out defibrination under 1 atmospheric pressure, refining concentration is 20～40%;
The 8th step, high dense stop: utilize the heat energy that produces in the defibrination process, make the slurry after the 7th step handled finish bleaching action in the dense reserving tower of height, stopping the reaction time is 60～120 minutes, and the temperature of reaction is that 85～95 ℃, reaction end pH value are 8.5～9.5;
The 9th step, the slurry after the 8th step handled with in dense mill be milled to the paper pulp of the required Canadian freedom of final paper product, refining concentration is 8～12%, the mill disposed slurry is latent through disappearing, washing, screening, last pulping places storage slurry tower.
2. the method for utilizing the full bar preparing bleached chemi-mechanical pulp of Ramulus Mori as claimed in claim 1 is characterized in that, described metal ion chelation agent is diethylene triamine pentacetic acid (DTPA) five sodium.
3. the method for utilizing the full bar preparing bleached chemi-mechanical pulp of Ramulus Mori as claimed in claim 1 is characterized in that, the compression ratio of described twin (double) screw extruder is a volume ratio 4～6: 1.
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Application publication date: 20091230 Assignee: Jiangsu Jinwo Machinery Co.,Ltd. Assignor: Institute of Chemical Industry of Forest Products, Chinese Academy of Forestry Contract record no.: 2013320000031 Denomination of invention: Method for preparing bleached chemi-mechanical pulp by using whole straw of mulberry tree branch Granted publication date: 20101208 License type: Exclusive License Record date: 20130129 |
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