CN101613969B - Pulping process for paper product pulp - Google Patents
Pulping process for paper product pulp Download PDFInfo
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- CN101613969B CN101613969B CN2008100170685A CN200810017068A CN101613969B CN 101613969 B CN101613969 B CN 101613969B CN 2008100170685 A CN2008100170685 A CN 2008100170685A CN 200810017068 A CN200810017068 A CN 200810017068A CN 101613969 B CN101613969 B CN 101613969B
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Abstract
The invention relates to pulping and papermaking technology, in particular to the pulping and papermaking technology for straw plants containing fibers, particularly a pulping process for paper product pulp, which adopts a method that: a pretreated raw material, together with an alkaline treatment medicament, is introduced into a sealed reaction device, and subjected to reaction at high temperature and high pressure; and an oxidant is added in the reaction process. The process realizes quick pulping and does not generate black liquor any more; and treatment difficulty of generated waste liquor is greatly reduced. The production process facilitates the posttreatment and up to standard emission of cooking wastewater, reduces environmental pollution, reduces the damage to the fibers due to high temperature cooking, and improves the quality of the obtained pulp.
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 process of paper product pulp.
Background technology
Traditional papermaking straw pulp production technology generally adopts alkaline process or sulfate process chemical pulping, its main method is with rice, fibrous raw materials such as wheat straw and alkaline process or sulphate cook soup add in the batch cooking rotary spherical digester together, feed steam, heat up, venting, heat up again, delignification reaction is carried out in insulation, thereby make rice, Straw Pulp, this gas phase boiling method cooking reaction is violent, most heat that adopt are spurted, the rice of boiling, Straw Pulp intensity is low, drainability is poor, especially soda pulping process semilate rice, the black digestion liquid silicone content of Straw Pulp is big, the viscosity height causes the of low quality of gained slurries, has caused rice simultaneously, the wheat straw black liquor recovery rate is low, black liquid extraction concentration is low, so alkali recovery is low and the cost height of recovery alkali.Seriously influence the enforcement of paddy and wheat straw pulp alkali recovery technology.This traditional digesting technoloy, its discharging black liquor is that its improvement of one of the present China of formation industrial wastewater primary pollution source is the emphasis of efforts at environmental protection, treatment technology to straw pulp black liquor has become a universally acknowledged difficult problem, particularly for small-sized, even medium-sized enterprise, investment is big owing to curb environmental pollution, operating cost is high, is raw material papermaking with the wheat straw, produce profit and avoid pollution hardly may.Have the little paper mill of 6000-7000 family 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 the 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.
Provide the method for employing enzyme catalyst to improve this technology at the many enterprises of this problem, but because technology is limit, only can reduction in a small amount pollute, what bring simultaneously is the significantly raising of equipment cost and production cost, is difficult to be promoted widely; While, therefore how in conjunction with current production devices, improving with the doulbe-sides' victory that reaches environmental protection and profit to production technology was a problem that needs to be resolved hurrily owing to the use of most of manufacturers all is the pulping by cooking technology of rotary spherical digester method.
Summary of the invention
Many deficiencies at pulping process existence in the existing papermaking, the invention provides a kind of pulping process of paper product pulp, it adopts pretreated raw material is fed the confined reaction device together with the basic treatment medicament, under High Temperature High Pressure, react and in course of reaction, add the method for strong oxidizer, realized quick pulping, simultaneously no longer produce black liquor, the liquid waste processing difficulty that is produced reduces greatly.After adopting this production technology, made things convenient for the post-processed and the qualified discharge of boiling waste water, reduced pollution, reduced the gained slurry of quality thermophilic digestion has improved to(for) the damage of fiber simultaneously for environment.
Technology of the present invention mainly comprises pretreated raw material, according to following ratio proportioning:
1 ton of raw material: 2-4 ton water: the alkaloids of 30-100kg,
Put in the airtight reactor, the pressure in the control reactor reacted 1-2 hour under 1-3 atmospheric level; The ratio of adding the 400-1200kg strong oxidizer according to raw material per ton is sent into reactor afterwards, reacts afterwards to get final product pulping in 0.5-2 hour, keeps pressure in the reactor at 3-8 atmospheric pressure in this reaction time.
In order to reach best treatment effect, when adopting peroxide as strong oxidizer, general control process is: with pretreated raw material, according to 1 ton of raw material: the ratio of the alkaloids of 3 tons of water: 40kg is put in the airtight reactor, pressure in the control reactor reacted 1-1.5 hour under 1-3 atmospheric level; The ratio of adding the 500kg peroxide according to raw material per ton is sent into reactor afterwards, reacts afterwards to get final product pulping in 1-1.5 hour, keeps pressure in the reactor at 4-6 atmospheric pressure in this reaction time.
When adopting hypochlorite as strong oxidizer, general control process is: with pretreated raw material, according to 1 ton of raw material: the ratio of the alkaloids of 3 tons of water: 40kg is put in the airtight reactor, and the pressure in the control reactor reacted 1-1.5 hour under 1-3 atmospheric level; The ratio of adding the 1000-1200kg hypochlorite according to raw material per ton is sent into reactor afterwards, reacts afterwards to get final product pulping in 1-1.5 hour, keeps pressure in the reactor at 4-6 atmospheric pressure in this reaction time.
The raw material weight of being mentioned in the above-mentioned technology is the absolute dry weight behind the removal moisture, adopt above-mentioned technology, owing to added the alkaloids of 30-100kg, make the lignin in the raw material can obtain certain removal, simultaneously because the addition of alkaline matter only is about the 30-80% of existing technology, greatly reduce the generation of black liquor, also reduced simultaneously the viscosity of cooking waste liquor, made things convenient for the shotcreting process in later stage, in order to reach best effect, the addition of general alkaloids is controlled at the consumption of raw material 40-50kg per ton.Owing in the process of pulping, need bigger pressure, therefore adopted closed container, generally the rotary spherical digester that can select for use most of producers using gets final product, the requirement that only needs the operating pressure of rotary spherical digester is regulated to meet technology gets final product, found new outlet with regard to the equipment that need upgrade like this for existing most of enterprises, promptly reach the purpose of cleaner production, farthest reduced the expense of production cost and technical equipment innovation again, be suitable for existing most of papermaking enterprise.
Can bring into play better delignification in order to make alkaline matter, the pressure of general control reactor gets final product at 1-3 atmospheric pressure, excessive pressure can make raw material be produced unnecessary black liquor pollution environment by overcook, reduce final yield simultaneously, therefore operating pressure that will this section is set at 1-3 atmospheric pressure, the time of control reaction simultaneously is at 1-2 hour, and the long black liquor that also can cause waste liquid to change high pollution into of reaction time is unfavorable for shortening time of pulping simultaneously.The control water consumption can effectively reduce the waste of water resource and the output of waste liquid at raw material water 2-4 ton per ton, can not cause the concentration of fiber to reduce simultaneously owing to water consumption is excessive, and generally preferably water consumption is a raw material 3-3.5 ton per ton.
After finishing above-mentioned reaction, add the ratio of 400-1200kg strong oxidizer according to raw material per ton and send into reactor, because the effect of oxidant, fibrous refinement in the raw material is separated, oxidizable substance in the material is removed, 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, created better reaction condition, thereby reduced the use amount of steam in the digestion process, the use amount that has reduced water resource has reduced energy consumption and production cost simultaneously; Because the effect of strong oxidizer, make the stem branch joint of reluctant wheat straw joint in the raw material or other fibrous plants obtain effective processing and be converted into available fiber, improved the yield of product, oxidizable substance and coloring matter oxidation in the waste liquid that the alkali lye digestion process is produced before inciting somebody to action simultaneously, made things convenient for the post-processed of waste liquid, for cleaning pulping provides strong help.In order to reach best effect, the inventor is through long-term plant experiment and calculating, the consumption of having determined strong oxidizer uses 400-1200kg comparatively suitable at raw material per ton, and wherein the effect that raw material per ton uses 500kg to handle when adopting peroxide as oxidant is best; When adopting hypochlorite as strong oxidizer, the effect that raw material interpolation 1000-1200kg per ton handles is best, consumption crosses that I haven't seen you for ages and causes the poor effect of oxidation, influence final yield and cause the viscosity of final gained waste liquid and colourity excessive, increased intractability, too small 3-8 the atmospheric pressure that can't reach technological requirement of Fan Ying thermal discharge simultaneously so just increased the consumption of steam; The oxidant consumption too much can cause the cracked even oxidation of excessive refinement of target fibers, also can cause the decline of yield and cause the quality of gained slurry to descend, exothermic heat of reaction is too fast too much simultaneously, cause the temperature, pressure in the reactor excessive, thereby cause the overload operation of closed container to cause production accident easily, therefore need consumption according to above-mentioned consumption standard control strong oxidizer.In this step processing, in order to prevent that the excessive hard cook of danger and raw material that causes of pressure from causing black liquor to increase and slurry quality decline, therefore with Pressure control at 3-8 atmospheric pressure, preferred 4-6 atmospheric operating pressure, when insufficient pressure that exothermic heat of reaction provided when reaching standard, can adopt the form that adds steam to be supplied.For the yield that guarantees to react, the reaction time of this step reaction was controlled at 0.5-2 hour, preferred 1-1.5 hour.
Described preliminary treatment mainly comprises the cut-out operation, generally raw material is cut into segment less than 6cm, can dwindle the length of raw material like this, make things convenient for the whitewashing operation in charging and later stage, prevent to cause the load of equipment to strengthen owing to the length of raw material is excessive, also prevented the inhomogeneous of processing, made that the fiber content of gained slurry is more even.Simultaneously contain too much impurity in the raw material, also can before entering cut-out technology, raw material at first be cleaned, to remove attached to its surperficial dust and impurity in order to prevent.
Described alkaline matter mainly comprises NaOH, potassium hydroxide, calcium hydroxide etc., and the perhaps mixture of above-mentioned multiple alkaline matter is as long as can guarantee the alkalescence of whole reaction system.The strong oxidizer that is adopted generally comprises: peroxide, as ammonium persulfate, hydrogen peroxide etc.; Hypochlorous acid class material, as clorox, calcium hypochlorite etc. when only adopting a kind of oxidant effectively to handle raw material, can mix two kinds of oxidants and use.Because the medicament that is adopted is the medicament commonly used in the paper industry, has promptly made things convenient for the purchase of producer, has also reduced for the required expense of scrap build, is suitable for existing most of papermaking enterprise and uses.
Through the raw material after the above-mentioned processing, the slurry of gained can form whitewashing under the effect of pressure after reaction is finished, and the yield of fiber is 50-75% in the gained slurries, and the fibre damage degree is traditional pulping process fibre damage degree 1-5%; The cod that handles back gained waste liquid is less than 10000, colourity be 5-800 doubly, the cod of gained black liquor is at 70000-80000 in traditional pulping process, colourity 6000-7000 situation has doubly had great improvement, has made things convenient for the liquid waste processing in later stage; The slurries of gained can through existing operation as grind, technology such as bleaching makes all kinds of pulps, also can further handle obtaining paper, specifically decide by user's different needs.
In sum, adopt this production technology after, the more existing digesting technoloy of available fiber content is enhanced in the slurries of gained, simultaneously the injury tolerance of the fiber yield that decreases drastically also is enhanced; Simultaneously because the decline of alkali consumption, make the viscosity, colourity etc. of technique waste water obtain effectively reducing, what emit no longer is reluctant black liquor, but the waste liquid of being convenient to handle has also finally been realized standard wastewater discharge, even part waste water realized the industrialization reuse, saved great amount of water resources.The consumption that the principle that has made full use of chemical heat release has reduced steam has reduced energy consumption, has reached the purpose of energy-saving and emission-reduction, is suitable for the technological improvement of existing each slurrying enterprise simultaneously, has reduced the cost of technological improvement, has improved the applicability of technology.
The specific embodiment
Process implementing example 1
A kind of pulping process, its processing step mainly comprises:
The segment of 5-6cm will be cut into after the cleaning of wheat straw process, afterwards with pretreated raw material, according to following ratio proportioning: 1 ton of raw material wheat straw: the NaOH of 2 tons of water: 50kg, put in the rotary spherical digester, pressure in the control reactor reacted 2 hours under 2 atmospheric levels; Send in the rotary spherical digester according to the ratio of raw material interpolation 500kg ammonium persulfate strong oxidizer per ton afterwards, react afterwards and got final product pulping in 1.5 hours, pressure in this reaction time in the maintenance reactor is at 3-4 atmospheric pressure, equipment whitewashing behind the pulping, the yield of gained slurry is: 65%, and the injury tolerance of fiber is: traditional pulping process fibre damage degree 5%; The waste liquid of gained, its cod are 10000, and colourity is 200 times.
The slurry of gained makes the standard white slurry through technologies such as fine grinding, bleachings and sells.
Process implementing example 2
A kind of pulping process, its processing step mainly comprises:
The segment of 5-6cm will be cut into after the cleaning of cotton stalk process, afterwards with pretreated raw material, according to following ratio proportioning: 1 ton of raw material: the potassium hydroxide of 3 tons of water: 40kg, put in the rotary spherical digester, pressure in the control reactor reacted 1 hour under 3 atmospheric levels; Send in the rotary spherical digester according to the ratio of raw material interpolation 1200kg clorox per ton afterwards, react afterwards and got final product pulping in 1 hour, pressure in this reaction time in the maintenance reactor is at 4-5 atmospheric pressure, equipment whitewashing behind the pulping, the yield of gained slurry is: 75%, and the injury tolerance of fiber is: traditional pulping process fibre damage degree 1.5%; The waste liquid of gained, its cod are 6000, and colourity is 10 times.
The slurry of gained makes the standard white slurry through technologies such as fine grinding, bleachings and sells.
Process implementing example 3
A kind of pulping process, its processing step mainly comprises:
Wheat straw is cut into the segment of 6-7cm, afterwards with pretreated wheat straw, according to following ratio proportioning: 1 ton of wheat straw raw material: the NaOH of 4 tons of water: 80kg, put in the rotary spherical digester, pressure in the control reactor reacted 1 hour under 2 atmospheric levels; Send in the rotary spherical digester according to the ratio of wheat straw interpolation 1050kg clorox per ton afterwards, react afterwards and got final product pulping in 0.5 hour, pressure in this reaction time in the maintenance reactor is at 6-7 atmospheric pressure, equipment whitewashing behind the pulping, the yield of gained slurry is: 70%, and the injury tolerance of fiber is: traditional pulping process fibre damage degree 3%; The waste liquid of gained, its cod are 8000, and colourity is 300 times.
The slurry of gained makes the standard white slurry through technologies such as fine grinding, bleachings and sells.
Process implementing example 4
A kind of pulping process, its processing step mainly comprises:
With wheat straw through the segment that is cut into 4-5cm after cleaning according to following ratio proportioning: 1 ton of wheat straw raw material: the potassium hydroxide of 2 tons of water: 100kg, put in the rotary spherical digester, the pressure in the control reactor reacted 2 hours under 3 atmospheric levels; Send in the rotary spherical digester according to the ratio of wheat straw interpolation 650kg hydrogen peroxide per ton afterwards, react afterwards and got final product pulping in 1.5 hours, pressure in this reaction time in the maintenance reactor is at 3-4 atmospheric pressure, equipment whitewashing behind the pulping, the yield of gained slurry is: 62%, and the injury tolerance of fiber is: traditional pulping process fibre damage degree 4.5%; The waste liquid of gained, its cod are 7500, and colourity is 350 times.
The slurry of gained makes the standard white slurry through technologies such as fine grinding, bleachings and sells.
Claims (4)
1. the pulping process of a paper product pulp, it is characterized in that: with pretreated raw material, according to 1 ton of raw material: the ratio of the alkaloids of 3 tons of water: 40kg is put in the airtight reactor, and the pressure in the control reactor reacted 1-1.5 hour under 1-3 atmospheric level; The ratio of adding the 500kg peroxide according to raw material per ton is sent into reactor afterwards, reacts afterwards to get final product pulping in 1-1.5 hour, keeps pressure in the reactor at 4-6 atmospheric pressure in this reaction time.
2. the pulping process of a paper product pulp, it is characterized in that: with pretreated raw material, according to 1 ton of raw material: the ratio of the alkaloids of 3 tons of water: 40kg is put in the airtight reactor, and the pressure in the control reactor reacted 1-1.5 hour under 1-3 atmospheric level; The ratio of adding the 1000-1200kg hypochlorite according to raw material per ton is sent into reactor afterwards, reacts afterwards to get final product pulping in 1-1.5 hour, keeps pressure in the reactor at 4-6 atmospheric pressure in this reaction time.
3. pulping process according to claim 1 and 2 is characterized in that: described alkaline matter is NaOH or potassium hydroxide or calcium hydroxide or its mixture.
4. pulping process according to claim 1 and 2 is characterized in that: the weight of described raw material is the weight of raw material behind the adiabatic drying.
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| CN2008100170685A CN101613969B (en) | 2008-06-25 | 2008-06-25 | Pulping process for paper product pulp |
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| CN2008100170685A CN101613969B (en) | 2008-06-25 | 2008-06-25 | Pulping process for paper product pulp |
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| CN101613969B true CN101613969B (en) | 2011-08-31 |
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| CN103255661A (en) * | 2013-05-14 | 2013-08-21 | 昆明理工大学 | Preparation method of straw pulp |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1293284A (en) * | 1999-10-13 | 2001-05-02 | 鱼京淑 | Technology for preparing paper pulp from corn stalk |
| CN1297084A (en) * | 1999-11-22 | 2001-05-30 | 黑龙江省兴凯湖造纸厂 | Middle- and high-grade stationery paper made of rice straw pulp and its making process |
| CN1371439A (en) * | 1999-08-30 | 2002-09-25 | 北卡罗来纳州立大学 | Pulping process for corn stover and other nonwood fibrous materials |
| 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 |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1371439A (en) * | 1999-08-30 | 2002-09-25 | 北卡罗来纳州立大学 | Pulping process for corn stover and other nonwood fibrous materials |
| CN1293284A (en) * | 1999-10-13 | 2001-05-02 | 鱼京淑 | Technology for preparing paper pulp from corn stalk |
| CN1297084A (en) * | 1999-11-22 | 2001-05-30 | 黑龙江省兴凯湖造纸厂 | Middle- and high-grade stationery paper made of rice straw pulp and its making process |
| 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 |
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