CN103147330A - Manufacturing method for environment-friendly paper pulp - Google Patents
Manufacturing method for environment-friendly paper pulp Download PDFInfo
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- CN103147330A CN103147330A CN 201310056544 CN201310056544A CN103147330A CN 103147330 A CN103147330 A CN 103147330A CN 201310056544 CN201310056544 CN 201310056544 CN 201310056544 A CN201310056544 A CN 201310056544A CN 103147330 A CN103147330 A CN 103147330A
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Abstract
The invention discloses a manufacturing method for environment-friendly paper pulp, which relates to pulping and papermaking technology for straw plants containing fibers and belongs to the technical field of pulping and papermaking. The method is characterized in that pretreated raw materials and an alkaline treating agent are introduced into an enclosed reaction unit and undergo a reaction at a high temperature and a high pressure and a strong oxidant is added in the process of reaction so as to realize rapid pulping. The invention has the following beneficial effects: black liquor is not generated anymore, and treating difficulty of liquid waste is substantially reduced.
Description
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Technical field
The present invention relates to contain the pulp and paper technology of the straw plant of fiber, belong to the pulp and paper technology field, specifically a kind of manufacture method of environment-friendly paper pulp.
Background technology
China's pulp and paper industry quantity of wastewater effluent accounts for 10～12% of national total amount of sewage discharge, occupies the 3rd; In sewage effluent, chemical oxygen consumption (COC) accounts for 40～45% of national total emission volumn, occupies first.The paper maker had become one of main industries of China's contaminated environment already.The general small scale of the enterprises in pulp and paper industry of China take non-timber as raw material is equipped relatively backwardly, and the pollution control degree of its waste water lags far behind world average level, and the problem of existence is many, is topmost pollution sources.The pollution of papermaking is mainly can use a large amount of bleaching agents in its production process, and acid material directly is discharged to the river course and causes water to pollute, and is exactly secondly the smell contaminated air that it distributes.
traditional papermaking straw pulp production technology generally adopts alkaline process or sulfate process chemical pulping, its main method is with rice, the fibrous raw materials such as wheat straw and alkaline process or sulphate cook liquid add in the batch cooking rotary spherical digester together, pass into 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 that is cooked into, Straw Pulp intensity is low, drainability is poor, especially soda pulping process semilate rice, the black digestion liquid silicone content of Straw Pulp is large, viscosity is high, cause the of low quality of gained slurries, caused simultaneously rice, Extraction Rate of Black Liquor is low, black liquid extraction concentration is low, so alkali recovery is low and the cost of recovery alkali is high.Seriously influence the enforcement of paddy and wheat straw pulp alkali recovery technology.This traditional digesting technoloy, its discharging black liquor be form one of present China industrial wastewater primary pollution source its
Improvement is the emphasis of efforts at environmental protection, and the treatment technology of straw pulp black liquor has been become a universally acknowledged difficult problem.
The national straw pulp black liquor that alkaline process chemical pulp generation more than 30% is approximately arranged basically without any processing, directly effluxes at present, 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.Many enterprises provide the method for employing enzyme catalyst to improve this technology for this problem, but because technology is limit, only can reduction in a small amount pollute, and are difficult to be promoted widely; So production technology improves jointly to reach environmental protection and profit is a problem that needs to be resolved hurrily.
Summary of the invention
The object of the present invention is to provide a kind of manufacture method of environment-friendly paper pulp, it adopts pretreated raw material is passed into the confined reaction device together with the basic treatment medicament, react and add the method for strong oxidizer in course of reaction under High Temperature High Pressure, realized quick pulping, simultaneously no longer produce black liquor, the liquid waste processing difficulty that produces reduces greatly.After adopting this production technology, facilitated post-processed and the qualified discharge of waste water from cooking, reduced the pollution for environment, reduced simultaneously thermophilic digestion and improved the quality of gained slurry for the damage of fiber.
For achieving the above object, the manufacture method of a kind of environment-friendly paper pulp of the present invention is characterized in that: according to following ratio proportioning: 1T raw material: the alkaloids of 1.5～2.5T water: 20～25kg; Above-mentioned raw materials is put in airtight reactor, controlled the interior pressure of reactor under 1～3 atmospheric level, reaction 1～2h; Then send into reactor according to the ratio of every T raw material interpolation 400～1200kg strong oxidizer, react afterwards 0.5～2h and get final product pulping, the pressure within this reaction time in the maintenance reactor is at 3～8 atmospheric pressure.
Described employing peroxide is during as strong oxidizer, control technique is: with pretreated raw material, according to the 1T raw material: the ratio of the alkaloids of 1.5T water: 23kg is put in airtight reactor, controls pressure in reactor under 1～3 atmospheric level, reaction 1～1.5h; Send into reactor according to the ratio of raw material interpolation 500kg peroxide per ton afterwards, react afterwards 1～1.5h and get final product pulping, the pressure within this reaction time in the maintenance reactor is at 4～6 atmospheric pressure.
Described employing hypochlorite is during as strong oxidizer, control technique is: with pretreated raw material, according to the 1T raw material: the ratio of the alkaloids of 1.5T water: 23kg is put in airtight reactor, controls pressure in reactor under 1～3 atmospheric level, reaction 1～1.5h; Send into reactor according to the ratio of raw material interpolation l000～1200kg hypochlorite per ton afterwards, react afterwards 1～1.5h and get final product pulping, the pressure within this reaction time in the maintenance reactor is at 4～6 atmospheric pressure.
The raw material weight of mentioning in described technique is the absolute dry weight after removal moisture, adopt above-mentioned technique, due to the alkaloids that has added 20～25kg, make the lignin in raw material can obtain certain removal, addition due to alkaline matter is only 30～80% left and right of existing technique simultaneously, greatly reduce the generation of black liquor, also reduced the viscosity of cooking waste liquor simultaneously.
Described alkaline matter is in order to bring into play better delignification, the pressure of general control reactor is at 1～3 atmospheric pressure, excessive pressure can make raw material be produced unnecessary black liquor pollution environment by overcook, reduce simultaneously final yield, therefore operating pressure that will this section is set as 1～3 atmospheric pressure, control simultaneously the time of reaction at 1～2h, 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.
Control water consumption at raw material water per ton 1.5～2.5T, can effectively reduce the waste of water resource and the output of waste liquid, can not cause because water consumption is excessive the concentration of fiber to reduce simultaneously, generally preferably water consumption is raw material 1.5～2.5T 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, effect due to oxidant, fibrous refinement in raw material is separated, oxidizable substance in material is removed, improve the purity of slurry, process due to oxidant and raw material reaction is the process of an exothermic reaction simultaneously, 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, effect due to strong oxidizer, make the stem branch joint of reluctant wheat straw joint in 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 before inciting somebody to action simultaneously, the alkali lye digestion process produces, facilitated 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 the effect that wherein raw material per ton uses 500kg to process when adopting peroxide as oxidant is best; When adopting hypochlorite as strong oxidizer, the effect that raw material interpolation per ton 1000～1200kg processes is best, consumption crosses that I haven't seen you for ages and causes the poor effect of oxidation, affect final yield and cause the viscosity of final gained waste liquid and colourity excessive, increased intractability, too small 3～8 atmospheric pressure that can't reach technological requirement of the thermal discharge of simultaneous reactions have so just increased the consumption of steam; The oxidant consumption too much can cause the cracked even oxidation of the excessive refinement of target fibers, also can cause the decline of yield and cause the Quality Down of gained slurry, the simultaneous reactions heat release is too fast too much, cause the temperature, pressure in reactor excessive, thereby easily cause the overload operation of closed container to cause production accident, therefore need to control according to above-mentioned consumption standard the consumption of strong oxidizer.In processing in this step, for the hard cook that prevents the excessive cause danger of pressure and raw material causes black liquor to increase and slurry quality decline, therefore pressure is controlled at 3～8 atmospheric pressure, preferred 4～6 atmospheric operating pressures, the insufficient pressure that provides when exothermic heat of reaction can adopt the form that adds steam to be supplied when reaching standard.For the yield that guarantees to react, the reaction time of this step reaction is controlled at 0.5～2h, preferred 1～1.5h.
Described preliminary treatment mainly comprises the cut-out operation, generally raw material is cut into the segment less than 6cm, can dwindle the length of raw material like this, facilitate the whitewashing operation in charging and later stage, prevent from causing because the length of raw material is excessive the load of equipment to strengthen, also prevent the inhomogeneous of processing, made the fiber content of gained slurry more even.Simultaneously to contain too much impurity in raw material in order preventing, also can before entering Cutting process, at first raw material to be cleaned, be attached to its surperficial dust and impurity with removal.
Described alkaline matter is a kind of in NaOH, potassium hydroxide, calcium hydroxide, perhaps the mixture of above-mentioned multiple alkaline matter.
Described strong oxidizer is 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 process raw material, can mix two kinds of oxidants and use.
Through the raw material after above-mentioned processing, the slurry of gained can form whitewashing under the effect of pressure after reaction is completed, and in the gained slurries, the yield of fiber is 50～75%, and the fibre damage degree is traditional pulping process fibre damage degree 1～5%; After processing, the cod of gained waste liquid is less than 10000, and colourity is 5～800 times, and the cod of gained black liquor is 70000～80000 in traditional pulping process, and the situation that colourity is 6000～7000 times has had great improvement, has facilitated the liquid waste processing in later stage; The slurries of gained can through existing operation as grind, the technique such as bleaching makes all kinds of pulps, also can further process obtaining paper.
The manufacture method of a kind of environment-friendly paper pulp of the present invention, its beneficial effect is: after adopting this production technology, in the slurries of gained, the more existing digesting technoloy of available fiber content is enhanced, and simultaneously the injury tolerance of the fiber yield that decreases drastically also is enhanced; While is due to the decline of alkali consumption, viscosity, colourity that makes technique waste water etc. has obtained effectively reducing, what emit is no longer reluctant black liquor, but the waste liquid of being convenient to process has also finally been realized the qualified discharge of waste water, even part waste water has been realized the industrialization reuse, has saved a large amount of water resources.The consumption that the principle that takes full advantage of chemical heat release has reduced steam has reduced energy consumption, has reached the purpose of energy-saving and emission-reduction, is suitable for simultaneously the technological improvement of existing each slurrying enterprise, has reduced the cost of technological improvement, has improved the applicability of technique.
The specific embodiment
Following examples are that the present invention further goes out to set forth.
Embodiment 1
1. be cut into the segment of 5～6cm after the wheat straw process being cleaned, afterwards with pretreated raw material, according to following ratio proportioning: 1 ton of raw material wheat straw: the NaOH of 2 tons of water: 20kg, put in rotary spherical digester, control the interior pressure of reactor under 2 atmospheric levels, reaction 2h; Send in rotary spherical digester according to the ratio of raw material interpolation 500kg ammonium persulfate strong oxidizer per ton afterwards, react afterwards 1.5h and get final product pulping, pressure within this reaction time in the maintenance reactor is at 3～4 atmospheric pressure, equipment whitewashing after 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, and the slurry of gained makes the standard white slurry through techniques such as fine grinding, bleachings and sells.
Embodiment 2
1. be cut into the segment of 5～6cm after the cotton stalk process being cleaned, afterwards with pretreated raw material, according to following ratio proportioning: 1 ton of raw material: the potassium hydroxide of 2.5 tons of water: 23kg, put in rotary spherical digester, control the interior pressure of reactor under 3 atmospheric levels, reaction 1h; Send in rotary spherical digester according to the ratio of raw material interpolation 1200kg clorox per ton afterwards, react afterwards 1h and get final product pulping, pressure within this reaction time in the maintenance reactor is at 4～5 atmospheric pressure, equipment whitewashing after 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, and the slurry of gained makes the standard white slurry through techniques such as fine grinding, bleachings and sells.
Embodiment 3
1. 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 1.5 tons of water: 25kg, put in rotary spherical digester, control the interior pressure of reactor under 2 atmospheric levels, reaction 1h; Send in rotary spherical digester according to the ratio of wheat straw interpolation 1050kg clorox per ton afterwards, react afterwards 0.5h and get final product pulping, pressure within this reaction time in the maintenance reactor is at 6～7 atmospheric pressure, equipment whitewashing after 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, and the slurry of gained makes the standard white slurry through techniques such as fine grinding, bleachings and sells.
Claims (4)
1. the manufacture method of an environment-friendly paper pulp is characterized in that: according to following ratio proportioning: 1T raw material: the alkaloids of 1.5～2.5T water: 20～25kg; Above-mentioned raw materials is put in airtight reactor, controlled the interior pressure of reactor under 1～3 atmospheric level, reaction 1～2h; Then send into reactor according to the ratio of every T raw material interpolation 400～1200kg strong oxidizer, react afterwards 0.5～2h and get final product pulping, the pressure within this reaction time in the maintenance reactor is at 3～8 atmospheric pressure.
2. a kind of manufacture method of environment-friendly paper pulp as claimed in claim 1, it is characterized in that: described employing peroxide is during as strong oxidizer, control technique is: with pretreated raw material, according to the 1T raw material: the ratio of the alkaloids of 1.5T water: 23kg is put in airtight reactor, control the interior pressure of reactor under 1～3 atmospheric level, reaction 1～1.5h; Send into reactor according to the ratio of raw material interpolation 500kg peroxide per ton afterwards, react afterwards 1～1.5h and get final product pulping, the pressure within this reaction time in the maintenance reactor is at 4～6 atmospheric pressure.
3. a kind of manufacture method of environment-friendly paper pulp as claimed in claim 1, it is characterized in that: described employing hypochlorite is during as strong oxidizer, control technique is: with pretreated raw material, according to the 1T raw material: the ratio of the alkaloids of 1.5T water: 23kg is put in airtight reactor, control the interior pressure of reactor under 1～3 atmospheric level, reaction 1～1.5h; Send into reactor according to the ratio of raw material interpolation l000～1200kg hypochlorite per ton afterwards, react afterwards 1～1.5h and get final product pulping, the pressure within this reaction time in the maintenance reactor is at 4～6 atmospheric pressure.
4. a kind of manufacture method of environment-friendly paper pulp as claimed in claim 1, it is characterized in that: described preferred water consumption is raw material 1.5～2.5T per ton.
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| CN 201310056544 CN103147330A (en) | 2013-02-22 | 2013-02-22 | Manufacturing method for environment-friendly paper pulp |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103304319A (en) * | 2013-06-19 | 2013-09-18 | 中农舜天生态肥业有限公司 | Organic and inorganic biological compound fertilizer and preparation method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103304319A (en) * | 2013-06-19 | 2013-09-18 | 中农舜天生态肥业有限公司 | Organic and inorganic biological compound fertilizer and preparation method |
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Application publication date: 20130612 |