CN1077630C - Process for producing pulp from lignocellulosic plants, and pulp obtained - Google Patents
Process for producing pulp from lignocellulosic plants, and pulp obtained Download PDFInfo
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- CN1077630C CN1077630C CN97193114A CN97193114A CN1077630C CN 1077630 C CN1077630 C CN 1077630C CN 97193114 A CN97193114 A CN 97193114A CN 97193114 A CN97193114 A CN 97193114A CN 1077630 C CN1077630 C CN 1077630C
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
- D21C1/00—Pretreatment of the finely-divided materials before digesting
- D21C1/06—Pretreatment of the finely-divided materials before digesting with alkaline reacting compounds
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21B—FIBROUS RAW MATERIALS OR THEIR MECHANICAL TREATMENT
- D21B1/00—Fibrous raw materials or their mechanical treatment
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21B—FIBROUS RAW MATERIALS OR THEIR MECHANICAL TREATMENT
- D21B1/00—Fibrous raw materials or their mechanical treatment
- D21B1/04—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres
- D21B1/12—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres by wet methods, by the use of steam
- D21B1/30—Defibrating by other means
- D21B1/36—Explosive disintegration by sudden pressure reduction
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
- D21C5/00—Other processes for obtaining cellulose, e.g. cooking cotton linters ; Processes characterised by the choice of cellulose-containing starting materials
Abstract
The invention relates to a process for producing pulp, from raw lignocellulosic material based on annual or perennial plants, or residues of such plants. The process comprises impregnating said raw material with an aqueous soda solution such that the weight proportion of soda is substantially comprises between 3.5 % and 10 % based on the dry material and that the weight ratio of hydration of the cellulosic material after impregnation is at least equal to 40 %, and subjecting the lignocellulosic material thus impregnated to vapocracking which consists in pressurising said material under saturated vapour conditions and producing a sudden expansion through a direct passage valve. The solid fraction which forms the pulp is then separated from the aqueous phase and the hydrosoluble products. The process yields good quality pulps characterized particularly by a braking length higher than 5500 meters, and having a high lignine ratio (KAPPA index comprises between 60 and 65).
Description
The present invention relates to a kind of method of producing paper pulp by the lignocellulosic material that with annual plant or perennial plant is base-material." annual plant " is meant about 1 year any plant in growth period (cotton, hemp, flax, cereal crops, sugarcane, Chinese sorghum etc.) hereinafter, and " perennial plant " is meant much longer plant in growth period (bamboo, reed, sisal hemp, broad leaf tree or coniferous tree etc.); The lignocellulosic material that the present invention relates to can comprise whole strain plant, or is some part (stem, leaf etc.) of these plants, or the accessory substance of these plants (straw, bagasse etc.).
People know, the paper pulp that has four classes to be obtained by annual plant or perennial plant basically at present:
-very low-quality paper pulp, its productive rate is higher than 90%: ground wood pulp, defibrator process wood pulp and chemical heat ground wood pulp,
-low-quality paper pulp, its productive rate are 80-90%: chemigroundwood pulp or machine-processed chemical wood pulp,
The paper pulp of-mean quality, its productive rate are 70-80%: half chemical wood pulp,
The paper pulp of-good quality, its productive rate are 45-55%: chemical wood pulp.
(productive rate typically refers to the part by weight in the resultant paper pulp of plant material starting weight in the paper pulp field).
From the paper pulp of very low-quality paper pulp up to good quality, because significant loss constantly increases, the expense of mechanical energy or heat energy constantly increases, and the consumption of the chemical products that uses constantly increases, and its production cost is constantly increase also.
Under the situation of the paper pulp of being produced by annual plant, just the chemical pulp that obtains with low-yield (being lower than 55%) just has high mechanical strength, and its intensity is corresponding to be greater than or equal to 5500-6000 rice with breaking length; Under the situation of the paper pulp of being produced by perennial plant, some half-chemical wood pulp can reach these intensity levels.People know, breaking length be supposition with any width and uniformly band wherein an end hangs the time, this band is broken length under the effect of its intrinsic weight.This breaking length can be calculated according to following formula: formula
In the formula:
-R
TBe to be the tensile break strength (standard NFQ03002) of unit representation with every meter newton,
-G is paper pulp quantitatively (every square metre of quality),
-g is acceleration of gravity (9.8 meter per second/second).
In addition, also have some for methods for the treatment of plants by these plant production animal feeding-stuff components.A kind of in these methods, be steam cracking (vapocraquage), be to allow lignocellulosic material be subjected to high temperature high pressure process (the about 20-30 crust of pressure, the about 210-240 of temperature ℃), reduce pressure then so that destroy this kind of plant, so improve its easy digestibility by this explosive the expansion suddenly.From its character itself, a kind of like this method causes the lignocellulose material to be degraded greatly owing to expanding suddenly, and promptly fiber seriously ruptures, and also causes hemicellulose and cellulosic component intense hydrolysis in the plant material.
Once proposed mainly to produce very low quality or low-quality paper pulp by trees with this process for steam cracking; The equipment of testing can be produced this class wood pulp, and its productive rate is higher than 80%.In some equipment, can be with this steam cracking and sodium sulfite Na
2SO
3Processing combines, and also combines with naoh treatment sometimes, and its sodium hydrate content is very low, is less than or equal to 2% (in the percetage by weight of dried lignocellulosic material NaOH).What should emphatically point out is, lignocellulosic material is applied very high mechanical stress, make the badly faulted process for steam cracking of fiber, demonstrating and obtain its breaking length at the very start, to be greater than or equal to 5500 meters good quality wood pulp incompatible, need keep these fibers because obtain a kind of like this quality.So any suggestion of using steam cracking to make paper pulp is confined to produce the very low quality or the low-quality wood pulp of pure ground wood pulp or chemigroundwood pulp class.
Except above-mentioned observed result, it should still be noted that the relevant possibility of using this cracking method to obtain the good quality wood pulp carried out two research work: " people such as B.V.KOKTA; CelluloseChem.Technol., 26,107-123 (1992) " and US-A-4798651 patent; " people such as H.MAMERS, TAPPI JOURNAL, Vol.64, n ° 7,93-96 (1981,7) ".
As if first research work (KOKTA) show that the wood pulp that adopts steam cracking to obtain good quality is possible, but use a high proportion of sodium sulfite (16%), thereby make this method have the defective of chemical method: a large amount of chemical productss that use make their circulation expend huge (in addition, people know that sodium sulfite makes that circulatory problems is difficult to solve especially).It is also noted that US-4798651 patent (KOKTA) is also mentioned the use swelling agent, but as indicated in the embodiment described in this patent, these swelling agents use when just in the end bleaching is operated, rather than use when steam cracking.
A kind of method of carrying out steam cracking has been described in another research work (MAMERS), when steam cracking, described material forces its material by a branch of discharge duct when reactor is discharged in the blast mode, and these discharge ducts can make described material be subjected to very strong mechanical shear stress.Under these conditions, lignocellulose fiber is degraded strongly, part raw material splits into very thin, therefore cause damage: explain so just (partly), the productive rate of method described in this article low (33.6-52.5%) is until being lower than as the 4th pointed chemical method productive rate of this article conclusion.It is also noted that this article points out that this blast carries out in the presence of NaOH, but indefinite its effect of explanation.
At present, the unique method that moves effectively with commercial scale that is obtained good quality wood pulp (breaking length is greater than or equal to 5500 meters) by annual plant is traditional or flexible chemical method, this method is used very a high proportion of chemical products (particularly, traditional chemical method 14-18% NaOH), and productive rate is very low, and its productive rate is 45-55%.As for perennial plant, some quasi-chemical method can reach these values, but only is to use some tree (coniferous tree) can reach these values, uses other tree or uses annual plant, and these performances are much lower.
The present invention proposes a kind of method of producing paper pulp by annual plant or perennial plant, the wood pulp that this method can obtain good quality (particularly, breaking length equals 5500 meters at least), this method uses the amount of suitable chemical reactor more much lower than the necessary amount of chemical method, and its productive rate is 60-70%, is much higher than the productive rate that obtains similar quality chemical wood pulp or is much higher than the productive rate of the method that is proposed by people such as MAMERS.The present invention relates to a kind of method, regardless of the plant character of using, this method can both reach these performances, and therefore under the situation of annual plant, this method also is noticeable especially for these plants provide a new outlet.
For this reason, the present invention produces the method for paper pulp, it is characterized in that this method combines following step:
-be the lignocellulosic material of base-material with sodium hydrate aqueous solution dipping with annual plant or perennial plant or these plant residues, so that containing the part by weight of NaOH in described lignocellulosic material is 3.5-10% in dry basically, and the hydration weight rate of described cellulose substances equals about 40% at least behind dipping
-then, in closed container, guarantee that by adding saturated vapor so the pressure and the temperature of the lignocellulosic material of dipping raise, in this container under temperature that reaches like this and pressure the described material of boiling, open the straight-through valve that links to each other with described container and be equipped with a suitable clear passage then, these materials are expanded suddenly, so that do not having to discharge these materials under the significant mechanical shear stress situation, thereby make the lignocellulosic material of this dipping carry out steam cracking
-the solid portion that will constitute paper pulp is separated with water-soluble products by water.
Method of the present invention is from following surprising observation result: at the NaOH part by weight is 3.5-10%, 5-8% preferably, and when carrying out the lignocellulosic material steam cracking under the situation of aquation ratio enough high (being higher than 40%), although explosion time is subjected to very big stress, but still can avoid the lignocellulose fiber degraded, thereby having kept the papermaking quality of these paper pulp, how also all like this type of plant (annual plant or perennial plant) is.So obtain the wood pulp of very high strength, its quality is corresponding to the quality of chemical wood pulp, and productive rate is much higher than the productive rate (the about 60-70% of the productive rate of being tested) of chemical method.Like this, with respect to traditional chemical method or flexible chemical method, on the one hand, the wood pulp weight that the present invention can obtain is higher than the same weight of lignocellulosic material, on the other hand chemical products consumption much lower (NaOH below 10%); These lower NaOH use amounts have important actually economical advantage, because they can cause reducing greatly the cycle cost of this product.Should emphatically point out, with respect to other chemical reagent that proposed as bisulfites and so on, use NaOH to have very important advantage, because NaOH is chemically circulating (change into sodium carbonate, calcining and use lime causticization) easily from essence.
An amount of NaOH and the steam cracking of carrying out fiberization are combined, keep these mechanism of the papermaking quality of fiber to be difficult to explain again simultaneously; But following hypothesis can be proposed:
1) NaOH that adds with predetermined ratio of a part reacts with the organic acid that least firm component discharges through hydrolysis in the material under temperature action.The organic acid neutralization of this NaOH and release, because NaOH has not reacted, this digestion media still is alkalescence.Under these alkaline pH conditions, the automatic hydrolysis phenomenon is suppressed, and this shows that the wood pulp productive rate increases, and also keeps the fiber in the cellulose that is not subjected to chemical action.
2) can dissolve hemicellulose a little as for the amount of remaining NaOH (not and the NaOH of organic acid reaction) and constitute the lignin of main bond between the fiber, the result is subjected to the elasticity that the material that has flooded of steam cracking has and is much higher than original elasticity, and bears unexpected expansion better; Under these conditions, this expansion is (predetermined aquation ratio allows this release) that is suitable for discharging fiber, limits these fiber degradation fractures simultaneously.On the contrary, when not having NaOH or its ratio to be less than or equal under 2% (generally being 0.5-1%) situation to implement the known steam cracking method, there is the raw material of very good structure to obtain relatively poor elasticity, and can be subjected at fiber exploding under the condition of very big loss.
What should emphatically point out is, importantly lignocellulose fiber is not subjected to significant mechanical stress after the container outlet blast, because some stress make NaOH protective effect explained earlier become invalid like this, and causing the cellulose in the lignocellulosic material cracked, this tries hard to avoid method of the present invention; Therefore, effect and the present invention of reaching of the method that proposes by people such as MAMERS completely contradict [pointed as the 3rd of the conclusion in the TAPPI JOURNAL article (fragmentation des cellules etdes fibres)].
Method of the present invention can be implemented with being selected from following plant, plant part or plant mixture:
-annual plant (cotton, hemp, flax etc.),
-cereal crops (wheat, barley, rye, oat, triticale, rice) stalk,
-perennial plant (bamboo, reed, sisal hemp, broad leaf tree, coniferous tree etc.),
-agriculture residue (bagasse, sugar grass slag etc.).
This method is significant especially for annual plant, because it can make the product increment of also regarding second class up to today as, and this method does not have the defective of chemical method.
Preferably, shred lignocellulosic material in advance, so as with its be reduced to length be substantially 0.5-15 centimetre the section.So increased the contact gear ratio surface of raw material and NaOH and saturated vapor.
It seems that regulating these parameters in the following manner can reach best pulp quality and maximum raising productive rate:
The part by weight of-NaOH is 5-8% substantially,
-hydration ratio is 60-85% substantially.
According to first kind of embodiment, roughly be in the 5-15 grams per liter sodium hydrate aqueous solution in concentration, and water volume (dry weight of solution weight/lignocellulosic material) roughly is 8-20, described raw material submergence was flooded in 10-30 minute.This embodiment causes equipment simple, and is also not too expensive.
According to another embodiment, dipping carries out as follows: spraying an amount of concentration on cellulose substances roughly is 10-25 grams per liter sodium hydrate aqueous solution, to reach above-mentioned part by weight and hydration ratio, lignocellulosic material will carry out mix when carrying out described sprinkling.
This dipping can at room temperature carry out.Improve temperature a little and help this dipping, particularly, it is possible selecting dipping temperature to be 40-60 ℃.
The general condition itself of implementing steam cracking is known: in closed container, roughly be 12-22 crust (12 * 10 by adding pressure
5To 22 * 10
5Pascal), and temperature roughly is 140-230 ℃ a saturated vapor, guarantee that the pressure and the temperature of having flooded lignocellulosic material raise, then after boiling a period of time, in less than the time in 4 seconds, make it return atmospheric pressure this medium decompression, as previously described, this is to be undertaken by a straight-through valve that can be limited in the suffered stress of lignocellulose fiber of container outlet, it is favourable carrying out steam cracking like this.
Steam cracking (temperature and pressure rising, boiling, the expansion) time is preferably adjusted to roughly 4-8 minute, can reach good fiberization and don't the remarkable degradation of fibers of meeting like this.
According to preferred embodiment a kind of, before steam cracking, the material that has flooded carries out preheating so that it reaches temperature is 60-100 ℃, and described warm-up operation and mechanically homogenise operation are combined.Under optimum condition (better productivity ratio), carry out steam cracking then.
The invention still further relates to by implementing the paper pulp that previously defined method is produced by annual plant; These paper pulp are characterised in that:
-breaking length is 5500-9000 rice basically,
-KAPPA value is 60-65 basically,
-concora test CMT (Concora Medium Test) index is 1.5-2.SN.m basically
2/ g,
-and the distribution of weight of following cellulose, hemicellulose and lignin: cellulose is that 55-80%, hemicellulose are that 12-25% and lignin are 8-12%.
According to the NFQ03002 standard test breaking length, according to the NFT12-018 standard test KAPPA value, also according to the NFQ03044 standard test CMT index.
Some paper pulp also never obtain up to now like this: these paper pulp are characterised in that to have extraordinary mechanical performance, and the lignin ratio that this right and wrong is normal high is correlated with.In known paper pulp, (the KAPPA value about 30) that the favorable mechanical performance is always relevant with low lignin ratio, this shows as low productive rate (lignin loss) when making paper pulp.
By following embodiment the present invention is described, wherein steam cracking is to carry out in the represented Container Type equipment of accompanying drawing Fig. 1 and 2 constructed profile; In these accompanying drawings:
-Fig. 1 is the schematic diagram of equipment,
-Fig. 2 is the reactor outlet profile that has disposed the straight-through outlet valve of outlet.
Embodiment is as follows among these embodiment:
At first, adopt usual way to remove unwanted irrelevant composition (rubble, sand, soil, sheet metal etc.) from lignocellulosic material.Adopt the hay cutter that 12 cuttves are arranged material to be chopped into 0.5-15 centimetre broken section then.
Raw material is completely infused in the sodium hydrate aqueous solution of 40 ℃ of temperature and carries out impregnation steps.By regulating following parameter adjustment fixing NaOH ratio and hydration ratio: concentration of sodium hydroxide solution, dip time, alr mode and dehydration (adopting the shaft type forcing press to dewater).
The raw material that will flood is added to as accompanying drawing with in 1 blender/preheater of representing then.In this equipment, add 3 crust steam its material is heated to about 90 ℃ of temperature; Residence time of material is 10 minutes.
Flood, the material of homogenizing and preheating adds in the steam cracking reaction device 2 again.
The steam cracking phase I comprises saturated vapor pressure and the rising temperature of charge of adjusting reactor.Owing to use boiler, the time in this stage very short (about 1-2 minute) with high flow capacity steam.
When reaching desired pressure, the stage of carrying out next steam cracking; This stage comprises the boiling of material isothermal and isobaric.Keep-up pressure and temperature by regulating loop 3, along with the steam in the reactor is condensed successively, loop 3 supply response device steam.
The final stage of steam cracking is unexpected expansion arc, is to throw open the straight-through blow-off valve 4 that is positioned at reactor bottom to operate.Therefore in an embodiment, this valve is the quillotine valve, when this valve is opened, can make reactor outlet unimpeded fully, guarantees that the continuity that material passes through do not have any obstacle.Under the effect of expanding suddenly, the condensed water in the plant under pressure changes into steam, and necessary energy when discharging the plant material fiberization.This material is discharged by straight-through valve does not have significant shear stress.
After steam cracking operation, cyclone separator 5 can separate and be recovered in explosion time (outlet 7) and generate gaseous state and contain water and solid (exporting 6) in mutually.
Having carried out 5 embodiment with the cereal crops straw, is respectively wheat (embodiment 1), triticale (embodiment 2), rye (embodiment 3), oat (embodiment 4), spring barley (embodiment 5).
According to following standard test make the mechanical property of resultant paper behind the paper pulp:
-quantitatively: NF Q03019
-thickness: NF Q03016
-tensile strength and percentage elongation: NF Q03002
-anti-tearing strength: NF Q03011
-breaking resistance: NF Q03053
-dull and stereotyped compression strength or CMT:NF Q03044
-Ring Crush Test or RCT:TAPPI T822om87
Following table has been compiled operating condition and resulting result.
| Embodiment 1 | Embodiment 2 | Embodiment 3 | Embodiment 4 | Embodiment 5 | |
| The dry material weight of having handled (kilogram) | 393.9 | 44.8 | 46.7 | 45.9 | 36 |
| Dipping | |||||
| Liquor capacity (liter) | 3218 | 1000 | 1000 | 1000 | 1000 |
| Naoh concentration (grams per liter) in the solution before the dipping | 9.7 | 10.4 | 5.6 | 9.2 | 10.2 |
| Dip time (minute) | 30 | 40 | 30 | 30 | 30 |
| Dipping and dehydration back surplus solution volume (liter) | 1919 | 870 | 880 | 850 | 850 |
| Naoh concentration (grams per liter) in dipping and the dehydration back solution | 3.1 | 9.5 | 4.4 | 8.8 | 9.1 |
| Fixing NaOH weight rate (%) | 6 | 4.6 | 3.6 | 3.8 | 6.7 |
| Hydration weight rate (%) | 76.7 | 74.4 | 72.0 | 76.6 | 80.6 |
| The preheating homogenizing | |||||
| Plant dry material weight rate (%) after the homogenizing | 20.5 | 22.2 | 23.4 | 19.5 | 16.4 |
| Steam cracking | |||||
| Cooking pressure (crust) | 19 | 19 | 16 | 17.5 | 17.5 |
| Boiling temperature (℃) | 212 | 212 | 204 | 208 | 208 |
| Pressure rising time (second) | 100 | 106 | 93 | 59 | 51 |
| Digestion time (second) | 330 | 270 | 300 | 330 | 360 |
| Productive rate and characteristic | |||||
| Behind washing, refining, classification, purifying, reclaim dry material paper pulp gross production rate % (weight) | 92.7 | 83.8 | 81.7 | 92.7 | 94.2 |
| Reclaim dry material paper pulp gross production rate % (weight) | 65.00 | 66.5 | 70.27 | 70.15 | 62.5 |
| Classification refuse (%) | 0.3 | 0.5 | 1.2 | 4.9 | 2.1 |
| Index (° SR) dewaters after the classification | - | - | - | 39 | 41 |
| Refining back dehydration index (° SR) | 32.5 | 45 | 45 | 38 | 53 |
| Quantitative (gram/rice 2) | 111.6 | 104.4 | 106.5 | 111.7 | 114.8 |
| Thickness (1/1000 millimeter) | 151 | 158 | 177 | 149 | 142 |
| The quality volume (centimetre 3/ gram) | 1.35 | 1.51 | 1.67 | 1.34 | 1.24 |
| Breaking length (m) | 8083 | 6690 | 5530 | 7500 | 7740 |
| Percentage elongation (%) | - | 2.99 | 3.00 | 3.34 | 2.99 |
| Cracked index (kPa m 2/g) | 4.78 | 33.9 | 3.2 | 4.59 | 4.61 |
| Tearing index (mNm 2/g) | 4.38 | 5.3 | 5.6 | 6.35 | 3.83 |
| RCT(N)(Ring Crush Test) | - | 148 | 161 | 182 | 172 |
| CMT index (Nm 2/g) | 2.00 | 1.68 | 1.51 | 1.55 | 1.61 |
| KODAK hardness (mN.m) | 0.82 | ||||
| SCT(nN/m) | 4.10 |
Embodiment 1 resultant paper pulp constituent analysis provides following result (distribution of weight):
-cellulose: 58.4%
-hemicellulose: 17.3%
-lignin: 10.5%
The KAPPA value of these embodiment is 62-65, and mean value is 64.
Claims (11)
1, produce the method for paper pulp, it is characterized in that this method combines following step:
-be the lignocellulosic material of base-material with sodium hydrate aqueous solution dipping with annual plant or perennial plant or these plant residues, so that containing the part by weight of NaOH in described lignocellulosic material is 3.5-10% in dry basically, and the hydration weight rate of described lignocellulosic material equals about 40% at least behind dipping
-then, in closed container, guarantee the pressure and temperature rising of the lignocellulosic material that flooded by adding saturated vapor, in this container under temperature that reaches like this and pressure the described material of boiling, open the straight-through valve that links to each other with described container and be equipped with a suitable clear passage then, these raw materials are expanded suddenly, so that when having remarkable mechanical shear stress, can not discharge these materials, thereby make the lignocellulosic material of this dipping carry out steam cracking
-the solid portion that will constitute paper pulp separates with water-soluble products by containing water.
2, shred lignocellulosic material in advance according to the process of claim 1 wherein, so that its length reduced to substantially 0.5-15 centimetre section.
3, according to the method for claim 1 or 2, wherein flood so that the NaOH part by weight is 5-8% substantially in the lignocellulosic material, the hydration ratio is 60-85% substantially.
4, according to the method for claim 1 or 2, it is characterized in that working concentration is 5-15 grams per liter sodium hydrate aqueous solution substantially, and water volume (dry weight of solution weight/lignocellulosic material) is 8-20 substantially, described raw material carries out 10-30 minute dipping.
5, according to the method for claim 1 or 2, it is characterized in that spraying an amount of concentration on cellulosic material is 10-25 grams per liter sodium hydrate aqueous solution substantially, to reach above-mentioned part by weight and hydration ratio, lignocellulosic material will carry out mix when carrying out described sprinkling.
6,, it is characterized in that adopting sodium hydrate aqueous solution to be 40-60 ℃ and carry out this dipping in temperature according to the method for claim 1 or 2.
7, according to the method for claim 1 or 2, in closed container, be 12-22 crust (12 * 10 substantially wherein by adding pressure
5To 22 * 10
5Pascal) and temperature be 140-230 ℃ saturated vapor substantially, guarantee to improve the pressure and the temperature of having flooded lignocellulosic material, after boiling a period of time, in less than the time in 4 seconds, make it return atmospheric pressure this medium decompression then by a straight-through valve.
8, method according to claim 7, it is characterized in that flooding lignocellulosic material steam cracking (temperature and pressure rising, boiling, the expansion) time of carrying out is 4-8 minute substantially.
9, according to the method for claim 7, it is characterized in that before steam cracking, flooded that material carries out preheating so that its material reaches temperature is 60-100 ℃, described warm-up operation and mechanical homogenization operation are combined.
10,, wherein use following plant, plant part or plant mixture as lignocellulosic material according to the method for claim 1 or 2:
-annual plant (cotton, hemp, flax etc.),
-cereal crops (wheat, barley, rye, oat, triticale, rice etc.) stalk,
-perennial plant (bamboo, reed, sisal hemp, broad leaf tree, coniferous tree etc.),
-agriculture residue (bagasse, sugar grass slag etc.).
11, adopt the paper pulp of the method for claim 1 or 2 by annual plant production, its breaking length roughly is a 5500-9000 rice, it is characterized in that:
(1) the KAPPA value is 60-65 substantially,
(2) concora test CMT index is 1.5-2.5N.m substantially
2/ g,
(3) following weight is distributed: cellulose is that 55-80%, hemicellulose are that 12-25% and lignin are 8-12%.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR96/00760 | 1996-01-17 | ||
| FR9600760A FR2743579B1 (en) | 1996-01-17 | 1996-01-17 | PROCESS FOR PRODUCING PAPER PULP FROM LIGNOCELLULOSIC PLANTS AND PAPER PULP OBTAINED |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1214091A CN1214091A (en) | 1999-04-14 |
| CN1077630C true CN1077630C (en) | 2002-01-09 |
Family
ID=9488388
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN97193114A Expired - Fee Related CN1077630C (en) | 1996-01-17 | 1997-01-15 | Process for producing pulp from lignocellulosic plants, and pulp obtained |
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| Country | Link |
|---|---|
| EP (1) | EP0874935B1 (en) |
| CN (1) | CN1077630C (en) |
| AT (1) | ATE192798T1 (en) |
| CA (1) | CA2242232A1 (en) |
| DE (1) | DE69701960T2 (en) |
| ES (1) | ES2146456T3 (en) |
| FR (1) | FR2743579B1 (en) |
| WO (1) | WO1997026401A1 (en) |
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| CN101748633B (en) * | 2008-12-19 | 2012-07-04 | 北京英力生科新材料技术有限公司 | Novel cellulose extraction process |
| CN105178080A (en) * | 2015-09-18 | 2015-12-23 | 新疆国力源投资有限公司 | Method for preparing flax stem unbleached pulp |
| CN108277670B (en) * | 2018-03-12 | 2024-03-08 | 北京新锐得环保科技有限公司 | Steam explosion pulping system for salix psammophila pulping |
| DE102019008351A1 (en) * | 2019-12-03 | 2021-06-10 | Klingele Papierwerke Gmbh & Co. Kg | Method and device for the production of pulp with a feed system and a screw system |
| WO2021110188A1 (en) * | 2019-12-03 | 2021-06-10 | Klingele Papierwerke Gmbh & Co. Kg | Method and device for producing fibrous material with a feed system and a helical screw system |
| CN113829459B (en) * | 2021-09-23 | 2022-07-22 | 北京科技大学 | Preparation method of artificially-degraded water-saturated wood |
| CN116084206A (en) * | 2022-12-29 | 2023-05-09 | 中冶美利云产业投资股份有限公司 | Production process of high-grade black paperboard |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4798651A (en) * | 1987-03-24 | 1989-01-17 | Stake Technology Ltd. | Process for preparing pulp for paper making |
-
1996
- 1996-01-17 FR FR9600760A patent/FR2743579B1/en not_active Expired - Fee Related
-
1997
- 1997-01-15 EP EP97900645A patent/EP0874935B1/en not_active Expired - Lifetime
- 1997-01-15 CA CA002242232A patent/CA2242232A1/en not_active Abandoned
- 1997-01-15 AT AT97900645T patent/ATE192798T1/en active
- 1997-01-15 DE DE69701960T patent/DE69701960T2/en not_active Expired - Fee Related
- 1997-01-15 ES ES97900645T patent/ES2146456T3/en not_active Expired - Lifetime
- 1997-01-15 CN CN97193114A patent/CN1077630C/en not_active Expired - Fee Related
- 1997-01-15 WO PCT/FR1997/000065 patent/WO1997026401A1/en active IP Right Grant
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4798651A (en) * | 1987-03-24 | 1989-01-17 | Stake Technology Ltd. | Process for preparing pulp for paper making |
Also Published As
| Publication number | Publication date |
|---|---|
| ES2146456T3 (en) | 2000-08-01 |
| DE69701960D1 (en) | 2000-06-15 |
| CN1214091A (en) | 1999-04-14 |
| DE69701960T2 (en) | 2001-01-25 |
| FR2743579B1 (en) | 1998-03-06 |
| EP0874935A1 (en) | 1998-11-04 |
| ATE192798T1 (en) | 2000-05-15 |
| CA2242232A1 (en) | 1997-07-24 |
| WO1997026401A1 (en) | 1997-07-24 |
| FR2743579A1 (en) | 1997-07-18 |
| EP0874935B1 (en) | 2000-05-10 |
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