CN1270023C - Pulp-making method of raising fiber-recovering quality - Google Patents

Pulp-making method of raising fiber-recovering quality Download PDF

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CN1270023C
CN1270023C CNB021606145A CN02160614A CN1270023C CN 1270023 C CN1270023 C CN 1270023C CN B021606145 A CNB021606145 A CN B021606145A CN 02160614 A CN02160614 A CN 02160614A CN 1270023 C CN1270023 C CN 1270023C
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liquor
boiling vessel
white liquid
cooking
minutes
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CN1423012A (en
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T·泰
J·F·德格劳
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Nevamar Corp
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W30/00—Technologies for solid waste management
    • Y02W30/50—Reuse, recycling or recovery technologies
    • Y02W30/64—Paper recycling

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Abstract

The invention provides a method for treating disused cellulose materials and its apparatus. The method includes: the step of adding cellulose materials and cooking liquor at least containing green liquor into a boiling apparatus, the step of cooking cellulose materials in the boiling apparatus at certain temperature, pressure and chemical load for a period of time, and forming basically mushy cellulose materials.

Description

Improve the pulping process of recycled fiber quality
Invention field
The present invention relates generally to the processing method of cellulosic material.More particularly, relate to the pulping process of recycled fiber cellulosic material, be applicable to the quality pulp of high-quality blank sheet of paper product with preparation.
Background of invention
The method that various processing cellulosic materials are arranged is to remove delignification, dyestuff, glue and other unwanted materials.The United States Patent (USP) 5147503 of Nguyen discloses and has reclaimed the waste cellulose material that comprises corrugated board, with the method and apparatus of preparation cellulosic pulp fiber.This method is included in the waste cellulose material of boiling such as corrugated board in the aqueous alkaline cooking liquor, is lower than the step of not floating paper pulp of the Kappa number of waste materials with the preparation Kappa number.The paper pulp that reclaims can be used for the special-purpose paper pulp composition of brown paper products, maybe can bleach so that the paper pulp of white goods to be provided.This brown stock can be mixed with magma.
Disclosed as United States Patent (USP) 5147503, cardboard is typically by the magma manufacturing.The preparation method of magma comprises at high temperature with alkaline cooking liquor and wooden sheet reaction or boiling.Lignin is the composition of wooden sheet, dissolves by cooking liquor in the preparation of cellulose pulp.The feature of the paper pulp of preparation depends on the degree of removing delignification from wooden sheet, promptly depends on the residual lignin content of final paper pulp.Kappa number is represented the measured value of remaining wood value cellulose content.The higher expression residual lignin of Kappa number level is higher.The Kappa number of the brown stock that obtains by boiling soft wood in kraft liquor is typically 50～100, and this paper pulp is used to make liner board or corrugated board.The Kappa number of the brown stock that obtains by boiling hardwood in kraft liquor is typically 130～160, and this paper pulp is used to make the corrugating medium of corrugated board.It is about 10～15 that the Kappa number of hardwood brown stock need drop to, and that the Kappa number of soft wood brown stock need drop to is about 25～35, so that the paper pulp that is suitable for bleaching to be provided, with preparation blank sheet of paper product.The Kappa number that contains the corrugated board waste material of liner board and corrugating medium is about 80～120.
The United States Patent (USP) 5587048 of Streisel etc., and Hank etc. 5538594 and 5597447 preparation waste cellulose material before boiling vessel is disclosed, and with the mixture process paper pulp of white liquid or white liquid and black cooking liquor, to prepare the method and apparatus of sheet paper products.
The United States Patent (USP) 6017415 of Phillips etc. discloses the waste cellulose material has been combined with wooden sheet, so that the method and apparatus of cellulose pulp to be provided.
5486268 of the United States Patent (USP) 5211809,5324390,5332471 of Naddeo etc. and Nguyen etc. disclose the method and apparatus of removing dyestuff and/or lignin with oxygen and other reagent from the paper pulp that reclaims.
The United States Patent (USP) 5213661 and 5338401 of Naddeo etc. discloses to be used oxygen and uses oxygen and other chemicals to remove the method for the viscosity of viscose glues as selecting.
None instruction of above-mentioned list of references adds green liquor in boiling is handled, with the plain paper pulp of the recycled fiber that low levels of lignin, high viscosity and high fibre strength are provided, make paper pulp can be used to make high-quality blank sheet of paper product, thereby improve the quantity of the useful circulation of cellulose fibre.
Summary of the invention
In the present invention, these targets and other tangible targets comprise that with the green liquor processing method and apparatus of the cellulosic material of waste cellulose material is achieved by providing to relate at least usually.
The preferable methods of handling the waste cellulose material comprises waste cellulose material and the cooked solution that contains green cooking liquor is placed boiling vessel, with under uniform temperature, pressure and chemical capacity value (chemical charge) in boiling vessel cooking cellulose material certain hour, to form the step of the cellulosic material make slurry substantially.Cooked solution also can contain at least white liquid, black liquor, anthraquinone or derivatives thereof, the liquid (aminerelated liquor) relevant with amine, pure as methyl alcohol or ethanol, and sulfite liquor (sulfite liquor).
In a preferred method, cooked solution can contain the white liquid of green liquor and 40-99%, or the white liquid of preferred 45-95%, or even the white liquid of preferred 60-80%, or the green liquor of most preferred about 70% white liquid and about 30%.
The waste cellulose material can contain initial Kappa number and be at least about 50 corrugated paper box and/or newsprint, and the cellulosic material of making slurry can have about 40 or lower Kappa number.The cellulosic material of making slurry can have the viscosity at least about 16-17cP, and boiling is preferably carried out under the chemical capacity value of counting about 9-13.5% total alkali content (total alkali) with the paper pulp gross dry weight.
Preferable methods also can comprise the black liquor that reclaims black liquor and be added to the small part recovery from the cellulosic material of making slurry in boiling vessel.
Other preferable methods comprise that the black liquor that is evaporated to the small part recovery is to form concentrated black liquid, burn to the small part concentrated black liquid with from the dissolving organic matter such as lignin and carbohydrate recover energy, with form to reclaim, be inorganic green liquor substantially, in boiling vessel, be added to the green liquor that small part reclaims, also can comprise the partially recycled at least green liquor causticization that not to add in the boiling vessel, with the white liquid of formation recovery, and in boiling vessel, be added to the white liquid that small part reclaims.
The preferred embodiment of the present invention can be included in the boiling vessel or mix cellulosic material and cooked solution before sending into boiling vessel, also can comprise adding steam.
The preferred embodiment of the present invention comprises the device of implementing method described herein.
Other purposes of the present invention, characteristics and advantage will understand that these accompanying drawings do not limit visual interpretation to the present invention when describing in detail preferred embodiment with reference to accompanying drawing following:
Accompanying drawing is briefly described
Fig. 1 is the calcspar that the expression prior art is removed the lignin method.
Fig. 2 is the calcspar that expression the present invention preferably removes the lignin method.
Fig. 3 is illustrated under three kinds of different total alkali content levels, with the chart of the green liquor that changes relative quantity with the levels of lignin of the paper pulp of white liquid boiling.
Fig. 4 is illustrated under the different total alkali content levels, with the green liquor that changes relative quantity and the viscosity of the paper pulp of white liquid boiling and the chart of levels of lignin.
Fig. 5 is speed is removed in expression with the lignin of green liquor that changes relative quantity and white liquid boiling a chart.
Preferred implementation is described in detail
Prior art
The present invention preferably reference standard pulping process describes.Fig. 1 is the calcspar that the expression prior art is removed the lignin method.Cellulosic material corrugated paper box or waste paper is as usual added in the pulper 2, in pulper 2, remove non-fibrous material.Surplus material is sent in the scavenger 4, in scavenger 4, removed other impurity, place storage area 6 then such as plastics, metal, non-fibrous material etc.Paper pulp is sent into the screw extruder 8 from storage area 6, added then in the boiling vessel 10.With white liquid (mainly is NaOH, Na 2S and some Na 2CO 3And Na 2SO 4Mixture) or this paper pulp of mixture boiling of boiling chemicals, described boiling chemicals can comprise that white liquid, black liquor (mainly are lignin, carbohydrate, NaOH, the Na of dissolving 2S and some Na 2CO 3And Na 2SO 4Mixture), anthraquinone or derivatives thereof, the liquid relevant with amine, alcohol be as methyl alcohol or ethanol, and sulfite liquor.After leaving boiling vessel 10, the paper pulp fiber of boiling is sent in the blow bin 12, made the pressure release of boiling vessel and drop to environmental pressure.With fiber by Screening Treatment 14, thereby dismiss fibre bundle and remove non-fibrous material, then fiber is sent in the rinsing maching 16, with rinse water remaining boiling chemical substance of flush away from the fiber.Behind rinsing maching 16, again fiber is carried out Screening Treatment 18, and be placed in the holder 20 as brown stock.This moment can be to fiber bleached and be used to make sheet paper products 22.
The black liquor that contains the lignin of removing in a large number from paper pulp reclaims from fiber in rinsing maching 16.Black liquor is sent in the evaporimeter 24 to remove part moisture, black liquor is concentrated to higher solids content, send into burning in the recovery furnace 26 then, produce heat energy from lignin and the carbohydrate that is dissolved in wherein.Portion of energy can be used for boiling and handles.Combustion process comprises oxidation and reduction reaction.In the zoneofoxidation of recovery furnace, Na 2The oxidized formation of S and NaOH Na 2CO 3And Na 2SO 4Then in the reducing zone that is arranged in furnace bottom by carbon with Na 2SO 4Be reduced into Na 2S.Then with the Na of fusion 2S and Na 2CO 3Be dissolved in the water, forming green liquor (mainly is Na 2S and Na 2CO 3With some Na 2SO 4Mixture with sodium thiosulfate).This green liquor sent into preserves in jars 28, then by with lime Ca (OH) 2Reaction forms NaOH and CaCO 3Carry out causticization 30, and send in the lime white rinsing maching 32, with NaOH and lime white (CaCO 3) separately.Reaction between lime and green liquor is with Na 2CO 3Change into NaOH, formation can add in the boiling vessel 10 the white liquid with another batch of boiling paper pulp.
Preferred implementation of the present invention
The present invention handles the preferred implementation of waste cellulose material can be closely similar with the method used in the prior art, and different is finds amazedly that green liquor can improve and remove lignin and handle, thereby preferably joins in the boiling vessel with cellulosic material.
It has been generally acknowledged that white liquor ratio green liquor is to removing the much effective of delignification.But when joining green liquor in the boiling vessel, the content of lignin of gained paper pulp only obviously reduces (lower Kappa number) with white liquid or with the paper pulp that the mixture of white liquid and black liquor obtains than general.And the paper pulp that gained paper pulp obtains than known boiling method has obviously higher viscosity.Pulp viscosity is usually used in weighing the cellulose in the fiber or the degree of polymerization of hemicellulose in paper industry.The viscosity of paper pulp is the reliable indication of fibre strength, and promptly the high more expression fibre strength of viscosity is high more.Recovery paper pulp with low levels of lignin and higher pulp viscosity can be used for making high-quality blank sheet of paper product and need not add magma after bleaching.
The definite reason of improving the result that obtains low levels of lignin is not known, but it is believed that when using the green liquor boiling, higher with the viscosity that only relatively obtains with white liquid boiling, because pure white liquid is because of the higher cellulose fibre that destroyed of its pH value, the high concentration that is the high alkalinity cooking liquor is removed delignification easily, but also destroys fiber.As green liquor, black liquor has the pH value lower than white liquid, but black liquor contains impurity and the lignin that is brought by the boiling processing in a large number, so levels of lignin is as being lowered effectively with green liquor.The green liquor that adds specified quantitative also make levels of lignin with only reduce sooner with white liquor ratio, make digestion time shorter, thereby reduced energy consumption.
Fig. 2 is illustrating of the preferred delignification processing of expression.In this embodiment, pulping process similar to the method for available technology adopting (Fig. 1).Yet improved method can directly add green liquor the boiling vessel 10 from container 28 by pipeline 34, and not necessarily, the part green liquor is become white liquid by causticization as mentioned above.In addition, pipeline 36 can join white liquid in the green liquor pipeline 34, makes that two kinds of cooking liquors are added in the boiling vessel simultaneously.And, can directly transfer in the boiling vessel 10 from the black liquor of rinsing maching 16, or white liquid and/or green liquor can mix (not shown) with black liquor reaching boiling vessel 10 before along pipeline 38.Can use to comprise anthraquinone or derivatives thereof, the liquid relevant, alcohol as methyl alcohol or ethanol with amine, and other chemicals of sulfite liquor.Zu He white liquid, green liquor, black liquor or other chemicals can add in the boiling vessel by any way, they are mixed as the corrugated paper box and/or the newsprint that reclaim with cellulosic material in boiling vessel, or these cooking liquors can mix (not shown) with cellulosic material before adding boiling vessel.
The various combinations of available these cooking liquors.Usually the white liquid of 40-99% and green liquor and nonessential other chemicals of 1-60% can be mixed.Preferably the white liquid of 45-95% and green liquor and nonessential other chemicals of 5-55% are mixed.More preferably the white liquid of 60-80% and green liquor and nonessential other chemicals of 20-40% are mixed.Most preferred embodiment is that the green liquor of about 70% white liquid and about 30% is mixed.In addition, cellulosic material can be used steam treatment before or after adding boiling vessel 10.In the digestion process in boiling vessel 10, preferred total alkali content scope is 9-13.5%, with the preparation quality pulp.Total alkali content is Na 2S, Na 2CO 3Combination with NaOH.With Na 2S, Na 2CO 3Be converted into Na with the weight of NaOH 2The weight of O is the common way in the pulp industry, and this numerical value is total alkali content.
Produced astonishing result with various cooking liquors especially green liquor and other cooking liquors are mixed, promptly reduced the levels of lignin in the paper pulp than former method, and the higher viscosity of paper pulp that gained paper pulp has kept the method than many prior aries to obtain, promptly higher fibre strength.Usually with identical digestion time, the method for prior art is reduced to the Kappa number of 40-55 with the levels of lignin of cellulose pulp from the Kappa number of about 90-130, and method of the present invention is reduced to about 20-40 with levels of lignin from about 90-130.The viscosity of the method gained paper pulp of prior art is no more than 12cP (centipoise) usually, and the viscosity of method gained paper pulp of the present invention can reach at least about 17cP.The paper pulp that levels of lignin is lower, especially full-bodied paper pulp can be used for the product of wider scope, and especially high-quality blank sheet of paper product, this blank sheet of paper were in the past commonly used to be made to small part magma.Therefore like this, preferable methods has kept fibre strength, has prolonged the service life of paper pulp, but because this paper pulp than more times ground recovery and reuse of former paper pulp.Directly the result has reduced the needs of magma and can make product widely from cellulosic material.
Do not change the preferable methods of general features of the present invention and can comprise (as depicted in figs. 1 and 2) with various possible variation between the prior art: preferable methods can be utilized screw extruder or the thickener 8 ' relative with screw extruder 8.Equally, the paper pulp after handling can be sent in bleach plant (bleach mill) and paper machine or the pulper (pulp machine) 22 ', just in time corresponding with bleach plant and paper machine 22.Other small variations of any amount all are possible.For example, Fig. 2 shows lime white (CaCO 3) reacting the limekiln 40 that forms lime (CaO), described lime can react with green liquor during causticization step 30.And, between pulper 2 and cleaner 4, can use screen cloth 42; Between screen cloth 18 and holder 20, can use cleaner 44.
Embodiment 1:
Obtain the recycled fiber material of corrugated board form of chips from contiguous container board mill.Fragment and water is mixed, and be dispersed in the medium-scale hydrabrusher with defibre.The fiber that will disperse (paper pulp) centrifuge dripping is removed any excessive moisture then.Push paper pulp then, make its pulp thickness be measured as 32%.The Kappa number of this paper pulp is 110, and pulp viscosity is 43.5cP.Pulp viscosity removes delignification with part and determines by using sodium chlorite solution's pulp treatment.The sodium chlorite solution by will about 7.5g sodium chlorite, 2.5g sodium acetate and 5ml glacial acetic acid and the mixed preparation of 120ml distilled water.1g paper pulp is at room temperature joined in the above-mentioned solution of 10ml, and put in the dark a night.
The boiling chemicals comprises that white liquid, black liquor and green liquor obtain from process of lapping and laboratory.Chemical capacity value on the recycled fiber is expressed with the total alkali capacity value on the fiber material (total alkali charge).In this research, the total alkali content (TA) of employing 9%, 11.25% and 13.5% 3 kind of level.
Digestion time, boiling temperature and pulp thickness keep identical level in each test.In all tests, boiling temperature was raised to about 170 ℃ high temperature from about 100 ℃ initial temperature in 57 minutes.Kept about 170 ℃ of temperature then 60 minutes.In all samples, pulp thickness is about 10%.The mixture that 5 kinds of white liquid and green liquor are all arranged for each total alkali content level: 100% white liquid/0% green liquor; 70% white liquid/30% green liquor; 50% white liquid/50% green liquor; 30% white liquid/70% green liquor; 0% white liquid/100% green liquor.Total alkali content percentage (TA) determined by the total alkali content in white liquid and/or the green liquor, represents that as the mixture of 70% white liquid/30% green liquor of 13.5% total alkali content 9.45% total alkali content makes clear one's meaning and position the total alkali content of liquid and 4.05% from green liquor.
Pulp-making test carries out in tubular reactor.The paper pulp of about 15g over dry is put into pipe, and white liquid and the green liquor with the pipette, extract requested number moves in the pipe then.Xiang Guanzhong adds deionized water, and the pulp thickness of each test is adjusted to about 10%.Cover tight tubular reactor with lid then, and transfer in 100 ℃ the oil bath.Then oil bath temperature was raised to 170 ℃ target boiling temperature in about 57 minutes.Tubular reactor remains in the oil bath in the boiling of remainder is handled, and changes during this period of time.After the boiling processing finishes, tubular reactor is transferred to the ice-water bath from oil bath.When after the pipe cooling, uncap is poured out paper pulp and is used washed with de-ionized water paper pulp.
The results are shown in the table 1 of these tests.Down flat at all bucks, the levels of lignin of cellulosic material (Kappa number) reduces in the mixture of about 70% white liquid and about 30% green liquor at most.Under total alkali content level, carry out boiling and obtain minimum levels of lignin 13.5.Fig. 3 is the diagram of table 1 data.Fig. 3 clearly illustrates that to utilize paper pulp that green liquor obtains in boiling is handled lower than the Kappa number of the paper pulp that only obtains with white liquid boiling.
Usually is that about 70% white liquid/30% green liquor boiling makes levels of lignin than only with green liquor the time more than the reduction 40-70% with ratio, more than the levels of lignin reduction 20-30% than only with white liquid the time.
Embodiment 2:
With with embodiment 1 in the recycled fiber of the old corrugated paper box that obtains with the paper pulp mill of the similar methods test described.Handle this material with hydrabrusher before the test, with loosen collagen fibre and cleaning.The initial Kappa number of this fiber is 92.1, and viscosity is 32.2cP, and pulp thickness is 28.7%.What viscosity such as embodiment 1 described measures on the paper pulp that chlorite is handled.
For estimate the degree that fibre strength keeps in this is handled, under various green liquors/white liquor ratio value, handle sample.Obtain various degree of delignification by the green liquor that changes under the different temperatures with relative consumption, total alkali capacity value and the digestion time of white liquid.The detailed preparation condition of per sample (p.s.) is shown in Table 2.Fig. 4 is the diagram of table 2 data, and shows than under the low kappa number, use to the paper pulp of small part green liquor boiling than only with the viscosity height of the paper pulp of white liquid processing.Fig. 5 is the diagram of table 2 data, and the green liquor of the different consumptions relatively of expression and slurrying speed different under the liquid in vain.Levels of lignin reduces under the situation of the mixture that occurs in about 70% white liquid and 30% green liquor the soonest.
When the present invention describes with reference to preferred implementation, one of ordinary skill in the art will appreciate that can carry out being equal to of various variations and key element substitutes and do not depart from the scope of the present invention.For example, the step of preferable methods and device or the accurate layout of equipment can be different, as long as can reach essentially identical result.For example, although preferred implementation has been described and obtained white liquid, green liquor and black liquor from pulping process, and they are turned back to method and apparatus in the boiling vessel, but usually that green liquor and other chemicals is mixed with the method for improving pulping process also within the scope of the present invention, and regardless of the source of these chemicals how.And the present invention can be used for handling the various cellulosic materials that are different from those disclosed in the preferred implementation.
Therefore, be not to want to limit the invention to conduct to be considered to finish optimal mode of the present invention and the disclosed specific embodiment, but the present invention will comprise all embodiments in the scope that belongs to dependent claims.
Table 1: the influence that green liquor is removed lignin
White liquid Green liquor Total alkali content Temperature is from the digestion time of 170 ℃ of 100- Digestion time under 170 ℃ Kappa number
Initial paper pulp 110
0％ 100％ 9％ 57 minutes 60 minutes 69
30％ 70％ 9％ 57 minutes 60 minutes 53.8
50％ 50％ 9％ 57 minutes 60 minutes 50.1
70％ 30％ 9％ 57 minutes 60 minutes 40
100％ 0％ 9％ 57 minutes 60 minutes 52.6
Initial paper pulp 110
0％ 100％ 11.25％ 57 minutes 60 minutes 68.7
30％ 70％ 11.25％ 57 minutes 60 minutes 47.5
50％ 50％ 11.25％ 57 minutes 60 minutes 46.6
70％ 30％ 11.25％ 57 minutes 60 minutes 33.1
100％ 0％ 11.25％ 57 minutes 60 minutes 41.8
Initial paper pulp 110
0％ 100％ 13.5％ 57 minutes 60 minutes 61.6
30％ 70％ 13.5％ 57 minutes 60 minutes 37.9
50％ 50％ 13.5％ 57 minutes 60 minutes 35
70％ 30％ 13.5％ 57 minutes 60 minutes 20.2
100％ 0％ 13.5％ 57 minutes 60 minutes 42
Table 2: green liquor is to the influence of lignin removal and pulp viscosity
White liquid Green liquor Total alkali content Temperature is from the digestion time of 170 ℃ of 100- Digestion time under 170 ℃ Kappa number Viscosity (cPs)
Initial paper pulp 92.1 32.2
100％ 0％ 9％ 57 minutes 60 minutes 52.5 20.6
100％ 0％ 12％ 57 minutes 60 minutes 39.3 16.5
100％ 0％ 12％ 57 minutes 90 minutes 28.9 14
100％ 0％ 12％ 57 minutes 120 minutes 23.6 11.3
Initial paper pulp 92.1 32.2
70％ 30％ 9％ 57 minutes 60 minutes 39.8 22.4
70％ 30％ 12％ 57 minutes 60 minutes 29.5 17.9
70％ 30％ 12％ 57 minutes 90 minutes 26 16.9
Initial paper pulp 92.1 32.2
50％ 50％ 9％ 57 minutes 60 minutes 44.9 25.8
50％ 50％ 12％ 57 minutes 60 minutes 35.6 20
50％ 50％ 12％ 57 minutes 90 minutes 31.8 20
Initial paper pulp 92.1 32.2
30％ 70％ 9％ 57 minutes 60 minutes 50.4 25.3
30％ 70％ 12％ 57 minutes 60 minutes 41 22
30％ 70％ 12％ 57 minutes 120 minutes 36.9 19
Initial paper pulp 92.1 32.2
0％ 100％ 9％ 57 minutes 60 minutes 65.3 27.2
0％ 100％ 12％ 57 minutes 60 minutes 60.4 25.9

Claims (17)

1, handle the method for waste cellulose material, may further comprise the steps:
(a) waste cellulose material and cooking liquor are sent in the boiling vessel, cooking liquor comprises the white liquid of 40-99% and the green liquor of 1-60%; With
(b) in boiling vessel, cooking cellulose material certain hour under the chemical capacity value of uniform temperature and 9-13.5% total alkali content forms the cellulosic material of making slurry substantially.
2, the process of claim 1 wherein that cooking liquor contains the white liquid of 45-95%.
3, the process of claim 1 wherein that cooking liquor contains the white liquid of 60-80%.
4, the process of claim 1 wherein that cooking liquor contains 70% white liquid.
5, the process of claim 1 wherein that cooking liquor contains 30% green liquor.
6, the process of claim 1 wherein that the waste cellulose material is made up of corrugated paper box and/or newsprint.
7, the process of claim 1 wherein that the waste cellulose material has is at least 50 initial Kappa number, and the cellulosic material of making slurry has and is no more than 40 Kappa number.
8, the process of claim 1 wherein that the cellulosic material of making slurry has the viscosity of 16cPs at least.
9, the process of claim 1 wherein that cooking liquor also contains at least a chemicals that is selected from black liquor, anthraquinone or derivatives thereof, the liquid relevant with amine, pure and mild sulfite liquor.
10, the method for claim 9, wherein alcohol is methyl alcohol or ethanol.
11, the method for claim 1, further comprising the steps of:
Cellulosic material and the cooking liquor of making slurry are emitted from boiling vessel; With
From the cellulosic material of making slurry, reclaim black liquor.
12, the method for claim 11, further comprising the steps of:
(a) black liquor of near small part recovery joins in the boiling vessel.
13, the method for claim 11, further comprising the steps of:
(a) be evaporated to the black liquor that small part reclaims, to form concentrated black liquid;
(b) burn to the small part concentrated black liquid, to form the green liquor that reclaims; With
(c) in the green liquor adding boiling vessel that near small part reclaims.
14, the method for claim 11, further comprising the steps of:
(a) be evaporated to the black liquor that small part reclaims, to form concentrated black liquid;
(b) burn to the small part concentrated black liquid, to form the green liquor that reclaims;
(c) in the green liquor adding boiling vessel that near small part reclaims;
(d) will not add the partially recycled at least green liquor causticization of boiling vessel, to form the white liquid that reclaims; With
(e) in the white liquid adding boiling vessel that near small part reclaims.
15, the process of claim 1 wherein that cellulosic material and cooking liquor are mixed in boiling vessel.
The process of claim 1 wherein before sending into boiling vessel that 16, cellulosic material and cooking liquor are mixed to form slurry.
17, the process of claim 1 wherein that elder generation adds steam in mixture before the mixture of cellulosic material and cooking liquor is sent into boiling vessel.
CNB021606145A 2001-09-19 2002-09-19 Pulp-making method of raising fiber-recovering quality Expired - Fee Related CN1270023C (en)

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JP5105271B2 (en) * 2005-09-22 2012-12-26 株式会社シード Waste paper recycling apparatus, pulp manufacturing apparatus, pulp supply apparatus, and dewatering apparatus
CN104345125B (en) * 2014-09-23 2016-02-17 周栋 A kind of method of Fast Evaluation willow sulfate pulping technique
CN106638079B (en) * 2016-12-08 2018-08-17 中山市为客包装制品有限公司 A kind of production method with antistatic characteristic paper pulp
CN106638078B (en) * 2016-12-08 2018-08-17 中山市为客包装制品有限公司 A kind of production method with fire resistance characteristic paper pulp
CN108166294A (en) * 2017-12-23 2018-06-15 林荣铨 A kind of paper products of graphene-containing and preparation method thereof
CN108149501A (en) * 2017-12-23 2018-06-12 林荣铨 A kind of graphene-containing/medicinal plant fiber and preparation method thereof
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