CN101748632B - Pulping process of paper pulp - Google Patents
Pulping process of paper pulp Download PDFInfo
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- CN101748632B CN101748632B CN2008102377613A CN200810237761A CN101748632B CN 101748632 B CN101748632 B CN 101748632B CN 2008102377613 A CN2008102377613 A CN 2008102377613A CN 200810237761 A CN200810237761 A CN 200810237761A CN 101748632 B CN101748632 B CN 101748632B
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Abstract
The invention relates to a pulp and paper technology, especially relating to a pulp and paper technology of straw plants containing fiber, in particular to a pulping process of paper pulp. The pulping process comprises the following steps: a preprocessed raw material is processed under the conditions of lower pressure and temperature and is changed into pulp by the role of chemical agents, fast pulping is realized, and at the same time black liquor is produced no longer; and the obtained pulp does not need bleaching and can carry out post processing. After the production process is adopted, the pulp only needs refining and can adopt the prior art to make paper, so directly adopting the chemical agents for pulping is realized. Compared with the existing chemical-mechanical pulping method, the pulping process reduces energy consumption and shortens the time required by the process. Furthermore, after the obtained pulp is made into paper, the quality of the paper is greatly increased.
Description
Technical field
The present invention relates to pulp and paper technology, be specifically related to contain the pulp and paper technology of the straw plant of fiber, particularly a kind of pulping disposed slurry can directly reach into the pulping process of paper whiteness standard.
Background technology
Traditional papermaking straw pulp production technology generally adopts the alkaline process chemical pulping, the straw pulp black liquor that this method produces, its improvement is the emphasis of efforts at environmental protection, treatment technology to straw pulp black liquor has become a universally acknowledged difficult problem, the optimal path of the improvement wheat straw black liquor of generally acknowledging is that alkali reclaims, but because Straw Pulp exists water filtering performance poor, black liquor viscosity is big, unfavorable factors such as silicon content height, make the alkali recovery technology difficulty very big, for small-sized, even medium-sized enterprise, investment is big owing to curb environmental pollution, the operating cost height is raw material papermaking with the wheat straw, produce profit and avoid polluting possibility hardly.Have 6000-7000 tame little paper mills to close because of not solving the pulp-making waste-water pollution in recent years, available resources such as a large amount of wheat straws go out of use; Because economic interests drive, still also have many wastewater treatments not up to standard in, small paper mill do not close; Some cost a huge sum of money pollution treatment engineerings of building are because the operating cost height, still sewage effluent stealthily.The national at present straw pulp black liquor that the alkaline process chemical pulp generation more than 30% is arranged approximately directly effluxes basically without any processing, accounts for 80-90% of gross contamination thing generating capacity.The black waste liquid of discharging contains a large amount of pollutants, and is the most serious to water pollution.
Except contaminated environment, more topmostly be, existing processes can't realize adopting chemically treated method directly to make the higher slurry of whiteness, all be to adopt chemical mechanical processing to combine to make master grind in the existing processes, adopt the method for repeatedly bleaching to make white slurry in the later stage again, the cost of sizing agent of gained is higher, simultaneously because processing procedure is longer, the yield of final slurry is lower, the quality of gained paper product also can't be guaranteed, and can't adapt to the requirement of society for intensification production and cleaner production.
Summary of the invention
Many deficiencies that exist at existing pulping process and can't adopt chemical treatment method directly to obtain the present situation of the higher slurry of high-quality whiteness, the invention provides a kind of pulping process of paper product pulp, it adopts pretreated raw material is handled under lower pressure and temperature conditions, effect pulping by chemical agent, realized quick pulping, no longer produce simultaneously black liquor, the slurry of gained need not bleached and can carry out the rear portion processing; After adopting this production technology, the slurry of gained only need carry out defibrination and can adopt prior art to become paper, realized direct employing chemical agent pulping, than existing chemical machinery pulping method, reduced energy consumption, shortened the required time of technology, and the slurry of gained becomes, and the quality of paper product is greatly improved behind the paper.
Technology of the present invention comprises that mainly its processing step is as follows:
With pretreated raw material with insert rotary spherical digester or connection digesting apparatus after alkaline matter mixes in, the weight ratio of raw material and alkaline matter is 100:6-100:12, and the weight ratio according to raw material and water is ratio corresponding water of adding in rotary spherical digester or connection digesting apparatus of 1:2.5-1:6 afterwards;
The pressurization that heats up, make raw material in rotary spherical digester or connection digesting apparatus with boiling 1-3h under the pressure of 80-120 ℃ temperature, 1-2kg;
After boiling finished, keeping the temperature in rotary spherical digester or the connection digesting apparatus was 75-85 ℃, added peroxide in rotary spherical digester or connection digesting apparatus, and the weight ratio of raw material and peroxide is 100:20-100:40, insulation 1.5-2.5h;
After insulation finishes, add polyacid in rotary spherical digester or connection digesting apparatus, the consumption of polyacid is the 1%-8% of peroxide weight, reacts after 10-20 minute and the gained slurry can be sent into the rear portion treatment process.
Wherein preliminary treatment comprises the raw material section that raw material is cut in advance diameter 0.5---7mm, length 1.5---50mm; Afterwards it is carried out removal of impurities, raw material just can carry out chemical immersion then, in order to reach better effect, raw material is cut in advance the raw material section of diameter 1.5---2.5mm, length 15---50mm.Can dwindle the length of raw material like this, make things convenient for the slurry process that in charging and later stage, prevent to cause the load of equipment to strengthen, also prevent the inhomogeneous of processing, make that the fiber content of gained slurry is more even owing to the length of raw material is excessive.
Described rear portion treatment process, mainly be that slurry with gained grinds, equipment such as the existing various fiberizers of general employing get final product, in order to reach best pulping effect, can adopt the fiberizer more than 2 to carry out serial operation, can improve the effect of defibrination like this, improve overall yield simultaneously; Can adopt the existing technology such as paper of copying to become paper through the slurry that grinds.
Raw material described in the above-mentioned technology is the hay of air-dry gained or the raw material of other straw plants that contain fiber, but not the absolutely dry raw material that dries out, the alkaline matter that is adopted is NaOH or potassium hydroxide or calcium hydroxide or its mixture, and preferably adopts NaOH; The peroxide that is adopted is hydrogen peroxide or sodium peroxide or potassium peroxide or its mixture, wherein preferred hydrogen peroxide; The polyacid that is adopted is sodium chlorate or sodium bromate or its mixture, wherein preferably adopts sodium chlorate.
Wherein, fibrous matter during the alkaline matter that adds has impelled originally dissociates, improved the effect of medicament infiltration, under alkali condition after the boiling, cooking liquor can fully enter in the material, and handling for the bottom provides environment preferably, and temperature and pressure is controlled at above-mentioned scope, both guaranteed that raw material can not caused the damage and the loss of fiber by hard cook, guaranteed medicament can be fully and raw material reaction; Adopt peroxide to handle afterwards, thereby mainly played the effect that chromogene plays the material decolouring of handling, fibrous refinement in the raw material is separated, the degree of polymerization that has kept simultaneously fiber again, remove the oxidizable substance in the material, improve the purity of slurry, simultaneously because the process of oxidant and raw material reaction is the process of an exothermic reaction, therefore the intensification for raw material provides condition to reduce the energy consumption of reaction, but in order to prevent to increase owing to peroxide adds the excessive leachable that causes, the situation that slurry yield reduces, the consumption of peroxide is controlled in the above-mentioned scope, but for the reaction time, in order to guarantee to obtain high preferably whiteness slurry, must be controlled in the above-mentioned time, otherwise the whiteness of the paper product that the gained slurry makes has the requirement that tangible reduction can't reach technology; In three-step reaction, add polyacid, cessation reaction timely, prevent that the unreacted peroxide from further causing slurry yield to descend to fiber oxidation, simultaneously can make things convenient for the discharge of slurry and follow-up processing, simultaneously owing to reduced the amount of leachable, also just reduce the COD of gained technique waste water, made things convenient for the processing and the reuse of technique waste water, reached the requirement of cleaner production.
In order further to improve the quality of gained slurry, the inventor is optimized above-mentioned pulping process, and its step is as follows:
With pretreated raw material with insert rotary spherical digester or connection digesting apparatus after alkaline matter mixes in, the weight ratio of raw material and alkaline matter is: 100:6-100:12, and the weight ratio according to raw material and water is afterwards: the ratio of 1:3.5-1:5 adds corresponding water in rotary spherical digester or connection digesting apparatus;
The pressurization that heats up, make raw material in rotary spherical digester or connection digesting apparatus with boiling 1.5-3h under the pressure of 90-120 ℃ temperature, 1-2kg;
After boiling finished, keeping the temperature in rotary spherical digester or the connection digesting apparatus was 75-85 ℃, added peroxide in rotary spherical digester or connection digesting apparatus, and the weight ratio of raw material and peroxide is 100:20-100:40, insulation 1.5-2.5h;
After insulation finishes, add polyacid in rotary spherical digester or connection digesting apparatus, the consumption of polyacid is the 1%-8% of peroxide weight, reacts after 10-20 minute and the gained slurry can be sent into the rear portion treatment process.
After adopting above-mentioned process control parameter, the reaction of various medicaments and raw material is more even, and the gained slurry can reach technologic requirement, and the paper product quality that the paper pulp of gained makes is better.
Through the raw material after the above-mentioned processing, after carrying out paste mill grinding, can save existing bleaching process, directly reach into the requirement of paper, thereby realized adopting chemical agent to handle the technological requirement that directly obtains high whiteness slurry, thoroughly having solved prior art can't adopt the chemical agent processing method to obtain the difficult problem of qualified high whiteness slurry, for paper technology provides brand-new production route, and this route can maximizedly utilize existing various paper making equipment, reduced enterprise's production cost, be suitable for large-scale popularization, also found another to utilize approach, realized the utilization and the environmental protection requirement of refuse for a large amount of straw plants that contains fiber.
The paper product that the paper pulp that adopts the present invention to make is at last made, its ring crush index, fracture length, folding strengths etc. all are enhanced: existing chemimechanical pulp, its yield only is about 70%, the ring crush index of gained paper product is generally 5, fracture length can reach 3.3km, it is about 18 times that folding strength is generally bent 135 ° number of times, and after adopting the used technology of the present invention, its yield is brought up to about 80-85%, the ring crush index of gained paper product is brought up to 9-10, fracture length can reach 5-6km, it is 60-80 that folding strength is generally bent 135 ° number of times, and whiteness is generally more than 40 degree, reached on the technology requirement for whiteness, and the waste liquid that produces in the pulping process, its COD is reduced to≤30000mg/L.This shows that gained paper pulp becomes every index behind paper nearly 10 percentage point that all rises; And the environmental protection index of pulping process water descends to some extent, and COD is reduced to≤30000mg/L, and colourity is at 1000-1500 times, and pH value is 6-8; The processing of the technique waste water of gained is convenient, and reduced the cost handled and to the pollution of environment.
In sum, adopt this production technology after, realized quick pulping, no longer produce simultaneously black liquor, the slurry of gained need not bleached and can carry out the rear portion and handle; The slurry of gained only need carry out defibrination and can adopt prior art to become paper, realized direct employing chemical agent pulping,, reduced energy consumption than existing chemical machinery pulping method, shortened the required time of technology, and the slurry of gained becomes, and the quality of paper product is greatly improved behind the paper.
The specific embodiment
Embodiment 1
A kind of pulping process of paper product pulp comprises that mainly its processing step is as follows:
Wheat straw after air-dry is cut in advance the raw material section of diameter 3.5---7mm, length 15---30mm; Afterwards it is cleaned removal of impurities;
With pretreated raw material 100kg with insert rotary spherical digester after the NaOH of 6kg mixes, in rotary spherical digester, add the water of 250kg afterwards;
The pressurization that heats up, make raw material in rotary spherical digester with boiling 3h under the pressure of 80 ℃ temperature, 1kg;
After boiling finished, keeping the temperature in the rotary spherical digester was 80 ℃, adds peroxide in rotary spherical digester, and peroxide adopts hydrogen peroxide, and consumption is 20kg, insulation 2.5h;
After insulation finishes, in rotary spherical digester, add the sodium chlorate of 1kg, react after 10-20 minute and the gained slurry can be sent into the rear portion treatment process.
The slurry of above-mentioned gained is carried out defibrination, makes the SR of slurry arrive 30,
Can make the finished product slurry after the dehydration, the slurry yield of technology is 85%;
The gained slurry is become paper by existing technology, and the paper product of gained is through detecting, and its ring crush index is 9, and fracture length is 4.5km, and folding strength is 60 times (135 ° folding), and the whiteness of paper product is: 45 degree, the waste liquid COD that produces in the pulping process is 27000mg/L.
Embodiment 2
A kind of pulping process of paper product pulp comprises that mainly its processing step is as follows:
Wheat straw after air-dry is cut in advance the raw material section of diameter 2.5-3.5mm, length 25--40mm; Afterwards it is cleaned removal of impurities;
With NaOH and the 10kg potassium hydroxide of pretreated raw material 200kg and 14kg, insert after the mixing in the rotary spherical digester, in rotary spherical digester, add the water of 1000kg afterwards;
The pressurization that heats up, make raw material in rotary spherical digester with boiling 1.5h under the pressure of 90 ℃ temperature, 1.2kg;
After boiling finished, keeping the temperature in the rotary spherical digester was 85 ℃, adds peroxide in rotary spherical digester, and peroxide adopts sodium peroxide, and consumption is 50kg, insulation 2h;
After insulation finishes, in rotary spherical digester, add the sodium bromate of 0.6kg,, react after 15-20 minute and the gained slurry can be sent into the rear portion treatment process.
Adopt existing two series connection fiberizers to carry out defibrination in the slurry of above-mentioned gained, make the SR of slurry arrive 32;
Can make the finished product slurry after the dehydration, the slurry yield of technology is 83%;
The gained slurry is become paper by existing technology, and the paper product of gained is through detecting, and its ring crush index is 9, and fracture length is 5.0km, and folding strength is 65 times (135 ° are folding), and the whiteness of paper product is: 47, and the waste liquid COD that produces in the pulping process is 26000mg/L.
Embodiment 3
A kind of pulping process of paper product pulp comprises that mainly its processing step is as follows:
Straw after air-dry is cut in advance the raw material section of diameter 1.5---2.5mm, length 30---45mm; Afterwards it is cleaned removal of impurities;
With pretreated raw material 500kg with insert rotary spherical digester after the NaOH of 40kg mixes, in rotary spherical digester, add the water of 2000kg afterwards;
The pressurization that heats up, make raw material in rotary spherical digester or connection digesting apparatus with boiling 1h under the pressure of 100 ℃ temperature, 2kg;
After boiling finished, keeping the temperature in the rotary spherical digester was 85 ℃, adds peroxide in rotary spherical digester, and peroxide adopts the mixture of potassium peroxide and sodium peroxide, and consumption is respectively 150kg, insulation 1.5h;
After insulation finishes, in rotary spherical digester, add the sodium chlorate of 9kg, react after 20 minutes and the gained slurry can be sent into the rear portion treatment process.
The slurry of above-mentioned gained is carried out defibrination, makes the SR of slurry arrive 35,
Can make the finished product slurry after the dehydration, the slurry yield of technology is 82%;
The gained slurry is become paper by existing technology, and the paper product of gained is through detecting, and its ring crush index is 9, and fracture length is 5.5km, and folding strength is 70 times (135 ° folding), and the whiteness of paper product is: 48 degree, the waste liquid COD that produces in the pulping process is 28000mg/L.
Embodiment 4
A kind of pulping process of paper product pulp comprises that mainly its processing step is as follows:
Straw after air-dry and wheat straw are cut in advance the raw material section of diameter 2.5---4.5mm, length 30---45mm; Afterwards it is cleaned removal of impurities;
With pretreated straw and each 150kg of wheat straw with insert rotary spherical digester after the NaOH of 24kg mixes, in rotary spherical digester, add the water of 1800kg afterwards;
The pressurization that heats up, make raw material in rotary spherical digester or connection digesting apparatus with boiling 1.5h under the pressure of 120 ℃ temperature, 1.8kg;
After boiling finished, keeping the temperature in the rotary spherical digester was 75 ℃, adds peroxide in rotary spherical digester, and peroxide adopts potassium peroxide, and consumption is respectively 100kg, insulation 2h;
After insulation finishes, in rotary spherical digester, add the sodium bromate of 7kg, react after 15 minutes and the gained slurry can be sent into the rear portion treatment process.
The slurry of above-mentioned gained is carried out defibrination, makes the SR of slurry arrive 37,
Can make the finished product slurry after the dehydration, the slurry yield of technology is 81%;
The gained slurry is become paper by existing technology, and the paper product of gained is through detecting, and its ring crush index is 10, and fracture length is 5.6km, and folding strength is 72 times (135 ° folding), and the whiteness of paper product is: 50 degree, the waste liquid COD that produces in the pulping process is 30000mg/L.
Embodiment 5
A kind of pulping process of paper product pulp comprises that mainly its processing step is as follows:
Wheat straw after air-dry is cut in advance the raw material section of diameter 3.5---7mm, length 15---30mm; Afterwards it is cleaned removal of impurities;
With pretreated raw material 400kg with insert rotary spherical digester after the NaOH of 48kg mixes, in rotary spherical digester, add the water of 2000kg afterwards;
The pressurization that heats up, make raw material in rotary spherical digester with boiling 3h under the pressure of 120 ℃ temperature, 2kg;
After boiling finished, keeping the temperature in the rotary spherical digester was 80 ℃, adds peroxide in rotary spherical digester, and peroxide adopts hydrogen peroxide, and consumption is 160kg, insulation 2h;
After insulation finishes, in rotary spherical digester, add the sodium chlorate of 1.3kg, react after 15 minutes and the gained slurry can be sent into the rear portion treatment process.
The slurry of above-mentioned gained is carried out defibrination, makes the SR of slurry arrive 45,
Can make the finished product slurry after the dehydration, the slurry yield of technology is 80%;
The gained slurry is become paper by existing technology, and the paper product of gained is through detecting, and its ring crush index is 10, and fracture length is 6.1km, and folding strength is 80 times (135 ° folding), and the whiteness of paper product is: 55 degree, the waste liquid COD that produces in the pulping process is 29000mg/L.
Claims (5)
1. the pulping process of a paper product pulp, it is characterized in that: its processing step is as follows:
With pretreated raw material with insert rotary spherical digester or connection digesting apparatus after alkaline matter mixes in, the weight ratio of raw material and alkaline matter is 100: 6-100: 12, and the weight ratio according to raw material and water is 1 afterwards: 2.5-1: 6 ratio adds corresponding water in rotary spherical digester or connection digesting apparatus;
The pressurization that heats up, make raw material in rotary spherical digester or connection digesting apparatus with boiling 1-3h under the pressure of 80-120 ℃ temperature, 1-2kg;
After boiling finished, keeping the temperature in rotary spherical digester or the connection digesting apparatus was 75-85 ℃, added peroxide in rotary spherical digester or connection digesting apparatus, and the weight ratio of raw material and peroxide is 100: 20-100: 40, and insulation 1.5-2.5h;
After insulation finishes, add sodium chlorate or sodium bromate or its mixture in rotary spherical digester or connection digesting apparatus, the consumption of above-mentioned substance is the 1%-8% of peroxide weight, reacts after 10-20 minute and the gained slurry can be sent into the rear portion treatment process;
Described alkaline matter is NaOH or potassium hydroxide or calcium hydroxide or its mixture;
Described peroxide is sodium peroxide or potassium peroxide or hydrogen peroxide or its mixture.
2. pulping process according to claim 1 is characterized in that: its processing step is as follows:
With pretreated raw material with insert rotary spherical digester or connection digesting apparatus after alkaline matter mixes in, the weight ratio of raw material and alkaline matter is: 100: 6-100: 12, and the weight ratio according to raw material and water is afterwards: 1: 3.5-1: 5 ratio adds corresponding water in rotary spherical digester or connection digesting apparatus;
The pressurization that heats up, make raw material in rotary spherical digester or connection digesting apparatus with boiling 1.5-3h under the pressure of 90-120 ℃ temperature, 1-2kg;
After boiling finished, keeping the temperature in rotary spherical digester or the connection digesting apparatus was 75-85 ℃, added peroxide in rotary spherical digester or connection digesting apparatus, and the weight ratio of raw material and peroxide is 100: 20-100: 40, and insulation 1.5-2.5h;
After insulation finishes, add sodium chlorate or sodium bromate or its mixture in rotary spherical digester or connection digesting apparatus, the consumption of above-mentioned substance is the 1%-8% of peroxide weight, reacts after 10-20 minute and the gained slurry can be sent into the rear portion treatment process;
Described alkaline matter is NaOH or potassium hydroxide or calcium hydroxide or its mixture;
Described peroxide is sodium peroxide or potassium peroxide or hydrogen peroxide or its mixture.
3. pulping process according to claim 1 is characterized in that: described raw material is the raw material after air-dry.
4. pulping process according to claim 1 and 2 is characterized in that: described preliminary treatment comprises the raw material section that raw material is cut in advance diameter 0.5---7mm, length 1.5---50mm; Afterwards it is carried out removal of impurities.
5. pulping process according to claim 1 and 2 is characterized in that: described rear portion treatment process comprises defibrination.
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| CN2008102377613A CN101748632B (en) | 2008-12-05 | 2008-12-05 | Pulping process of paper pulp |
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| CN2008102377613A CN101748632B (en) | 2008-12-05 | 2008-12-05 | Pulping process of paper pulp |
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| CN101748632A CN101748632A (en) | 2010-06-23 |
| CN101748632B true CN101748632B (en) | 2011-12-28 |
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| CN102505544B (en) * | 2011-11-02 | 2015-07-15 | 齐鲁工业大学 | Straw pulp making process |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1814910A (en) * | 2005-11-01 | 2006-08-09 | 张承绍 | Method for making paper pulp by using hydrogen peroxide and alkali substance reaction together |
| CN101063276A (en) * | 2006-04-26 | 2007-10-31 | 北京国力源高分子科技研发中心 | Method for hybrid giant napier producing in oxygen free radical doffing/bleaching integrated reactor with albefaction paper stuff |
| CN101082187A (en) * | 2007-08-03 | 2007-12-05 | 山东泉林纸业有限责任公司 | Oxygen delignify treating method for grass group unbleached chemical pulp |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1814910A (en) * | 2005-11-01 | 2006-08-09 | 张承绍 | Method for making paper pulp by using hydrogen peroxide and alkali substance reaction together |
| CN101063276A (en) * | 2006-04-26 | 2007-10-31 | 北京国力源高分子科技研发中心 | Method for hybrid giant napier producing in oxygen free radical doffing/bleaching integrated reactor with albefaction paper stuff |
| CN101082187A (en) * | 2007-08-03 | 2007-12-05 | 山东泉林纸业有限责任公司 | Oxygen delignify treating method for grass group unbleached chemical pulp |
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