CN101082188A - Scouring process for grass pulping course - Google Patents
Scouring process for grass pulping course Download PDFInfo
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- CN101082188A CN101082188A CN 200710143131 CN200710143131A CN101082188A CN 101082188 A CN101082188 A CN 101082188A CN 200710143131 CN200710143131 CN 200710143131 CN 200710143131 A CN200710143131 A CN 200710143131A CN 101082188 A CN101082188 A CN 101082188A
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Abstract
The invention provides a washing process in the grass pulping. It contains the following steps: A) send the cooked pulp into the presser for pressing to get the coarse pulp. B) Process the coarse pulp through the jumping screen. C) Send the screened pulp into the pulp washer for washing. The rigidity of the screened pulp is potassium permanganate value 16-28 (equals to karber value 24-50). The washed solvent remains 90-150ppm. Take the high rigidity pulp in this invention as materials to prepare bleaching chemical pulp by pressing and washing. The whiteness of the chemical pulp is 68-82%ISO and the removal rate of the lignin is 84-98%. The quality of the bleaching chemical pulp prepared by the grass is similar, even better than that of the exciting hardwood pulp.
Description
Technical field
The present invention relates to the washing process in a kind of grass pulping process.
Background technology
The grass raw material is tiny owing to fiber, and heteroproteose cell is many, ash content and pentose content height, and the black liquor viscosity that obtains with the soda pulping process boiling is also big.Therefore, therefore, when dogstail raw material that alkaline cooking is crossed washs, easily form filtering layer closely in suction washer, filtration resistance is big, and detersive efficiency is also than wood pulp difference.
In rolling up the May in 2006 the 25th of " slurrying and papermaking " magazine, disclose and be entitled as " calculating the combination process of talking drum-type vacuum pulp washing machine and Double screw pulp extruder from black liquid extraction " literary composition, mention existing many manufacturers in the literary composition in order to reach the extraction rate of black liquor height in the washing process, before wash engine, install 1 Double screw pulp extruder additional, directly extract the concentrated black liquid that spurts in the thick slurry in back, effect is also good, therefore, the high concentration that increases by 1 acroll press washer and so in the wash engine front is extracted black liquor equipment, the wheat straw black liquor recovery rate is brought up to more than 90%, like building consensus.
It has been generally acknowledged that the kind difference of paper pulp, the complexity of washing is also different, general long fiber drainage water filtering performance is good, be easy to washing, the dogstail plasmoid is more because of containing heteroproteose cell, and half fiber content is also many, easy aquation, water filtering performance is poor with respect to wood pulp, relatively is difficult to washing, and the wood pulp that uses alkaline process to make simultaneously more is difficult to washing than the wood pulp that uses acid system to make.
For straw pulp, the hardness height of slurry, viscosity is little, and the beginning water filtering performance is good, but last wash degree is relatively poor, this is because there is fibrous inside in a part of waste liquid, the slurry that hardness is high, and fiber destruction is few, inner waste liquid mainly be by the paper hole by in the lumen to external diffusion, the paper pulp that hardness is high, intrastitial waste liquid diffusional resistance just reaches, difficult more washing.The straw pulp that makes for alkaline process is with respect to wood pulp, and the difficulty of washing is bigger.
Technical scheme provided by the present invention is that the washing difficulty of the wood pulp that makes with alkaline process is launched greatly for solution just.
Summary of the invention
The invention provides the washing process in a kind of grass pulping process.
The invention provides the washing process in a kind of grass pulping process, comprise the steps:
A) slurry that obtains after the boiling be transported to carry out shove in the press master, slightly starched,
B) with described thick slurry through jumping the slurry after sieve obtains jumping sieve,
C) slurry behind the described jumping sieve sent in the wash engine washed,
The hardness of the slurry behind the jumping sieve wherein is the 16-28 permanganate number, is equivalent to card uncle valency 24-50, and the dissolvent residual behind the pulp washing is 90-150ppm.Above-mentioned solvent is meant residual cooking liquor, and for adopting alkaline cooking, above-mentioned solvent is and contains residual aqueous slkali, for adopting ammonium sulfite, above-mentioned solvent is and contains residual ammonium salt solution, and by that analogy, above-mentioned solvent can also be other solution that often uses in digestion process.
In washing process used solvent be with digestion process in solvent be identical, but its concentration will be lower than the solvent strength in digestion process from far away, this is in order to form concentration difference between inside and outside the cell fiber in washing process, in order to reach the pressure balance inside and outside the cell, water in the solvent enters cell interior, same intracellular solute spreads to the extracellular, thereby reaches the inside and outside pressure balance of cell.Thereby can macroscopic view show as: in the process of washing with the residual reduction of fibrocyte internal solvent of grass, thereby reach the effect of cleaning thick slurry.
The present invention also provides a kind of washing process, wherein in described steps A, the slurry that obtains after the boiling is carried out the adjusting of concentration with described solvent.The temperature that when carrying out above-mentioned concentration adjustment is can be carried out under the condition identical with the temperature of thermophilic digestion, also can temperature carry out after reducing after boiling, carries out under preferably identical with the thermophilic digestion temperature condition.
The present invention also provides a kind of washing process, and wherein said washing is when being 20 ℃ with temperature, and concentration is that a kind of in the solvent of 3-6.2 ° of Be ' and PH 8-8.3 or the clear water or two kinds wash.Better to clean effect in order reaching, can to wash with clear water again by after the solvent wash.Certainly in order in washing process, there to be clean result can also adopt clear water repeatedly to wash.
The present invention also provides a kind of washing process, and wherein said washing process carries out under vacuum condition.The purpose that adopts vacuum pulp washing machine is the easier inside and outside pressure difference of fibrocyte that is formed in the washing process, so more helps the wash degree that reaches high in washing process.
The present invention also provides a kind of washing process, and wherein said pulp washing is to adopt vacuum pulp washing machine, horizontal belt wash engine, pressure wash engine, high-speed pulp washer, slanted screen wash engine.
The present invention also provides a kind of washing process, and vacuum pulp washing machine wherein is drum-type vacuum pulp washing machine and level band vacuum pulp washing machine.
The present invention also provides a kind of washing process, and the concentration of wherein said jumping screening the pulp is 2.8-3.2%, pH value 7-9.
The present invention also provides a kind of washing process, and wherein said dogstail is a straw, and described jumping screening the pulp beating degree is 36-39 ° of SR.
The present invention also provides a kind of washing process, and wherein said dogstail is a wheat straw, and the button degree of separating of described jumping screening the pulp slurry is 22-25 ° of SR.
The present invention also provides a kind of washing process, and wherein the temperature 60-70 in the washing process ℃, the weight in wet base 1.8-2.1g of the slurry that obtains after the washing, the concentration of the slurry that obtains after the washing is 9-14%.。
Any combination between the above embodiment can reach clean result of the present invention.
Unlike the prior art be that the hardness of the handled grass slurry of the present invention is equivalent to card uncle valency 24-50 for the 16-28 permanganate number, the handled dogstail slurry of the present invention simultaneously is the high-hardness pulp that obtains through behind alkaline process and the sulfite cooking.Normally think for the dogstail of this high rigidity slurry those skilled in the art to obtain good clean result, yet after washing of the present invention, but can reach dissolvent residual is 90-150ppm.
The present invention at first adopts the way of extruding generally can extract the black liquor that is free between the fiber, for be present in the lumen and cell membrane in the part black liquor, can only just can extract with the way of diffusion.For this reason, obtain high paper pulp of wash degree and high solvent extraction rate, must select for use to have extruding concurrently, spread and replace the washing system of three kinds of effects.
That is adopted among the present invention successively carries out once or repeatedly washing with a kind of or solvent in solvent or the clear water and clear water, has utilized the effect of metathesis and diffusion just.These two kinds of effects are usually carried out simultaneously, diffusion is: the waste liquid that is present in fibrous inside can be used the method for dilution, cause the concentration difference of the inside and outside solution of fiber, intrastitial dissolved substance is diffused out, press filtration concentrates and to be separated then, and diffusion is exactly to produce the migration metathesis under the promotion of concentration difference, that is the high side's of concentration high dense thing molecule is just mobile to a low side, the side's that concentration is low hydrone also will be to the high side migration of concentration, displacement simultaneously.So the inside and outside liquid waste concentration difference of fiber is the motive force of diffusion, influence to diffusion velocity is bigger, and diffusion area is relevant with paper pulp kind and hardness thereof, and diffusion coefficient depends on the penetrating power of solid content when external diffusion of waste liquid dissolving in the fiber, with wash temperature, viscosity is relevant with pressure again.
Water or rarer waste liquid infiltrate the slurry layer more equably by filtration, displace the waste liquid of the flowing space in the slurry and with its isolated by filtration, promptly replace original liquid in the slurry with washing, in replacement process, because the influence of liquid waste concentration difference, diffusion is also carried out simultaneously.
After washing, also need the slurry that obtains bleached again and can obtain paper pulp.Bleaching can adopt the chemistry of tri-stage bleaching chemistry of the prior art, post-bleach, the bleached chemical of the ECF of element chlorine free bleaching system, the TCF of total chlorine free bleaching system slurry, the chemical pulp of oxygen-alkali bleaching, chemistry, displacement bleaching and the bio-bleaching of ozone bleaching all can.
Beneficial effect of the present invention is: high-hardness pulp of the present invention is a raw material with high-hardness pulp of the present invention, and through extruding washing back preparation bleach chemical pulp, the whiteness of described bleach chemical pulp is 68-82%ISO, and the delignification rate is 84-98%.With described high-hardness pulp is the prepared bleach chemical pulp of raw material, its beating degree is 25-36 ° of SR, fracture length is 4500-8000m, folding number is 20-70, preferred 20-60, whiteness is 68-82%ISO, and the quality of prepared with the grass kind plant the is bleach chemical pulp of feedstock production is comparable to existing leaf wood paper pulp, even has also surpassed existing leaf wood pulp quality.
The specific embodiment
Following examples are used for better understanding the present invention, but are not used in restriction the present invention
Embodiment 1:
Straw carries out boiling through Ammonium Sulfite Method, the hardness that obtains rice straw pulp after the boiling is 16 permanganate numbers, be equivalent to card uncle valency 24, rice straw pulp is regulated concentration to 10% with black liquor, then be transported to acroll press washer and arrange the processing of " dense " black liquor by pump, the concentrated black liquid of gained can be used for the evaporation of postorder and make fertilizer, the concentration of the slurry of extruding 10% brings up to 18% before the shove, this moment, the pH value of slurry was 8, the black liquid consistency of extruding is 9 ° of Be ' (20 ℃), residual ammonium 8g/L, again the rice straw pulp that obtains behind the shove is used for being diluted to the concentration of slurry to 2.5-3.0%, deliver to jump to sieve and carry out thick pulp screen choosing, jumping the sieve loss is 0.3%, to jump the rice straw pulp that obtains behind the sieve again adopts the drum-type vacuum pulp washing machine to wash, temperature in the washing process is 65 ℃, the beating degree that enters the thick slurry of wash engine is 36 ° of SR, it is that temperature is when being 20 ℃ that concentration is at first adopted in washing, concentration is 6.1 ° of Be ', and PH 8.1 black liquor wash, then adopt the oxygen delignification black liquor to wash once more, the weight in wet base of the slurry after the washing is 1.8g, and the residual of the imonium solvent behind the pulp washing is 140ppm.And the slurry of discharging from vacuum pulp washing machine is removed impurity by the high concentration scummer again, loss 0.1%, the concentration of washing disposed slurry is 9%, slurry is transported in the hypochlorous acid single stage bleaching technology at last and carries out single stage bleaching, to bleach disposed slurry with pump again pumps into vacuum pulp washing machine and washs, the whiteness of the bleach chemical pulp that obtains is 68%ISO, and the delignification rate is 86%.
Embodiment 2:
Wheat straw carries out boiling through Ammonium Sulfite Method, the hardness that obtains Straw Pulp after the boiling is that 18 permanganate numbers are equivalent to card uncle valency 29, Straw Pulp is when just finishing boiling, when temperature is 160 ℃, regulate concentration to 10% with black liquor, this Straw Pulp is transported to acroll press washer by pump carries out shove, the black liquor vaporizing of extruding is made fertilizer, the concentration of the slurry of extruding 8% brings up to 19% before the shove, this moment, the pH value of slurry was 8, the black liquid consistency of extruding is 11 ° of Be ' (20 ℃), residual ammonium 8g/L, the concentration that resulting Straw Pulp is diluted to slurry with black liquor is to 2.5-3.0% again, delivers to jump sieve and carry out thick pulp screen choosing, jumping the sieve loss is 0.2%, to jump the Straw Pulp employing level band vacuum pulp washing machine that obtains behind the sieve again and wash, the temperature in the washing process is 60 ℃, and the slurry concentration of vacuum cleaning is 2.8%, adopt clear water to carry out secondary washing in the washing process, the beating degree that enters the slurry of wash engine is 22 ° of SR.The weight in wet base of the slurry after the washing is 1.8g, remaining imonium in the slurry is 110ppm, the wash degree of pulp washing is 10% for the slurry concentration of coming out from wash engine, and the slurry of discharging from vacuum pulp washing machine is removed impurity by the high concentration scummer again, loss 0.1% is transported to slurry in the hypochlorous acid single stage bleaching technology at last and carries out single stage bleaching, will bleach disposed slurry with pump again and pump into vacuum pulp washing machine and wash, the whiteness of the bleach chemical pulp that obtains is 68%ISO, and the delignification rate is 86%.
Embodiment 3:
Straw carries out boiling through alkaline process, the hardness that obtains cotton stem pulp after the boiling is that 20 permanganate numbers are equivalent to card uncle valency 34, this rice straw pulp is transported to the single-screw press master by pump carries out shove, the concentration of the slurry of extruding 8% brings up to 20% before the shove, this moment, the pH value of slurry was 8.5, with the slurry that obtains, add black liquor and jump sieve, jump the concentration of regulating slurry before the sieve, with the concentration dilution to 3.0% of slurry, jumping the sieve loss is 0.2%, to jump behind the sieve slurry that obtains again is transported in the fluffer and discongests, adding concentration simultaneously in the equipment of discongesting is the alkali of 38g/L, and the weight of alkali lye is 3% of oven dry stock quality, and the beating degree of the rice straw pulp before discongesting is 20 ° of SR, can see by naked eyes, after breaking into two with one's hands through the rice straw pulp of discongesting operation, do not have bar-shaped fiber, this illustrates by discongesting operation, can reach bundle dividing from effect, the beating degree of the rice straw pulp after discongesting is 24 ° of SR, and the temperature of the rice straw pulp before discongesting is 60 ℃, and the temperature of the rice straw pulp after discongesting is 70 ℃.The rice straw pulp that will obtain after will discongesting again adopts the pressure wash engine to wash, and the rice straw pulp button degree of separating that enters rinsing maching is 39 ° of SR.It is that residual alkali is 0.6g/L that concentration is at first adopted in washing, when temperature is 80 ℃, concentration is that 3.6 ° of Be ' black liquor wash, then adopt clear water to wash once more, can wash more than three times with clear water, keep 70 ℃ in the washing process in order to reach better clean result, the slurry concentration of washing is 3.0%, the residual alkali concn of pulp washing is 90ppm, and the slurry concentration of coming out from wash engine is 11%, the weight in wet base 1.8-2.1g of the slurry that obtains after the washing.
At last slurry is transported in the hydrogen peroxide bleaching technology and bleaches, will bleach disposed slurry with pump and pump into vacuum pulp washing machine and wash, the whiteness of the bleach chemical pulp that obtains is 72%ISO, and the delignification rate is 84%.
Embodiment 4:
Straw carries out boiling through alkaline process, the hardness that obtains rice straw pulp after the boiling is that 22 permanganate numbers are equivalent to card uncle valency 30, boiling finishes the back and keeps cooking liquor under 150 ℃ temperature, with diluted alkaline thick slurry is regulated, concentration up to slurry reaches 10%, this rice straw pulp is transported to the single-screw press master by pump carries out shove, the concentration of the slurry of extruding 10% brings up to 19% before the shove, this moment, the pH value of slurry was 8.5, with the slurry that obtains, adding black liquor accent is dense to enter the jumping sieve after 2.5%, and jumping is sieved and lost is 0.2%, to jump the rice straw pulp that obtains behind the sieve again adopts high-speed pulp washer to wash, the slurry concentration of washing is 3.2%, and the concentration of the residual alkali behind the pulp washing is 150ppm, and the slurry concentration of coming out from wash engine is 14%, keep 62-65 ℃ in the washing process, the thick slurry beating degree that enters rinsing maching is 39 ° of SR.It is 0.6g/L that residual alkali is at first adopted in washing, and 83 ℃ of black liquor of 4.0 ° of Be ' wash, and the slurry concentration of coming out from wash engine is 12%, the weight in wet base 2.0g of the slurry that obtains after the washing.The slurry that obtains behind the pulp washing is transported in the oxygen-alkali bleaching technology bleaches, will bleach disposed slurry with pump and pump into water flat rubber belting vacuum pulp washing machine and wash, the whiteness of the bleach chemical pulp that obtains is 74%ISO, and the delignification rate is 86%.
Embodiment 5:
Straw carries out the rotary spherical digester boiling through Ammonium Sulfite Method, the hardness that obtains rice straw pulp after the boiling is that 25 permanganate numbers are equivalent to card uncle valency 42, the pH value of boiling end is 8, the residual ammonium of black liquor is controlled at 9g/L, the concentration of the slurry in the rotary spherical digester is controlled at 10%, then the rice straw pulp after the boiling is transported to acroll press washer by pump and arranges the processing of " dense " black liquor, the concentration of the slurry of extruding 9% brings up to 21% before the shove, the concentrated black liquid of gained can be used for the evaporation of postorder and make fertilizer, this moment, the pH value of slurry was 8,10 ° of Be ' when the black liquid consistency of extruding is 20 ℃, residual ammonium 10g/L, 75 ℃ of temperature, again the rice straw pulp that obtains behind the shove is diluted to the concentration of slurry to 2.5-3.0% with black liquor, deliver to jump to sieve and carry out thick pulp screen choosing, jumping the sieve loss is 0.2%, remove impurity by the high concentration scummer again, loss 0.1%, the rice straw pulp that will obtain after will removing the gred again enters the horizontal belt wash engine and washs, the slurry concentration of washing is 3.0%, and the residual ammonium concentration behind the pulp washing is 250ppm, and the slurry concentration of coming out from wash engine is 9%, keep 68-70 ℃ in the washing process, the thick slurry beating degree that enters rinsing maching is 39 ° of SR.Be 90ppm through two sections residual ammonium concentrations of vacuum pulp washing machine displacement washing again after oxygen takes off, the weight in wet base of the slurry that obtains after the washing is 1.9g.Slurry after the washing is carried out tri-stage bleaching with pump slurry is pumped into vacuum pulp washing machine after finishing and wash, the whiteness of the bleach chemical pulp that obtains is 78%, and the delignification rate is that the 90% slurry concentration of coming out from wash engine is 11%.
Embodiment 6:
Wheat straw carries out boiling through Ammonium Sulfite Method, the hardness that obtains rice straw pulp after the boiling is that 27 or 28 permanganate numbers are equivalent to card uncle valency 48-50, regulate the concentration to 9% of the slurry in the digester, this Straw Pulp is transported to the single-screw press master by pump carries out shove, the concentration of the slurry of extruding 10% brings up to 18% before the shove, this moment, the pH value of slurry was 8.0, with the slurry that obtains, adding black liquor accent is dense to enter the jumping sieve after 2.5%, jumping the sieve loss is 0.3%, to jump behind the sieve slurry that obtains again is transported in the dry pan and discongests, the beating degree of the Straw Pulp before discongesting is 20 ° of SR, can see by naked eyes, after breaking into two with one's hands through the slurry of discongesting operation, there is not bar-shaped fiber, this the explanation by discongesting operation, can reach bundle dividing from effect, the beating degree of the Straw Pulp after discongesting is 32 ° of SR, the temperature of the Straw Pulp before discongesting is 60 ℃, and the temperature of the wheat straw after discongesting is 65 ℃.The thick slurry that will obtain after will discongesting again adopts vacuum pulp washing machine to carry out third wash, be that the black liquor of 58 ℃ of 5 ° of Be ' carries out displacement washing at first with concentration, the slurry concentration of washing is 2.8%, imonium residual rate behind the pulp washing is 170ppm, the beating degree of the thick slurry of wash engine is 24 ° of SR, the slurry concentration of coming out from wash engine is 11%, this moment, the weight in wet base of slurry was 2.0g, temperature in the washing process is 70 ℃, dense pump is transported to the oxygen delignification reaction tower in the back slurry process of washing, with two sections vacuum pulp washing machine filtering stocks of slurry input, the whiteness of the bleach chemical pulp that obtains is 78%ISO at last, and the delignification rate is 95%.
Claims (10)
1. the invention provides the washing process in a kind of grass pulping process, comprise the steps:
A) slurry that obtains after the boiling be transported to carry out shove in the press master, slightly starched,
B) with described thick slurry through jumping the slurry after sieve obtains jumping sieve,
C) slurry behind the described jumping sieve sent in the wash engine washed,
The hardness that it is characterized in that the slurry after described jumping is sieved is the 16-28 permanganate number, and the dissolvent residual behind the pulp washing is 90-150ppm.
2, washing process according to claim 1 is characterized in that in described steps A, the slurry that obtains after the boiling is carried out the adjusting of concentration with described solvent.
3, technology according to claim 1 is characterized in that described washing is when being 20 ℃ with temperature, and concentration is that a kind of in the solvent of 3-6.2 ° of Be ' and PH8-8.3 or the clear water or two kinds wash.
4, technology according to claim 1 is characterized in that described washing process carries out under vacuum condition.
5, technology according to claim 1 is characterized in that described pulp washing is to adopt vacuum pulp washing machine, pressure wash engine, high-speed pulp washer, slanted screen wash engine.
6, technology according to claim 1 is characterized in that described vacuum pulp washing machine is drum-type vacuum pulp washing machine and level band vacuum pulp washing machine.
7, technology according to claim 1, the concentration that it is characterized in that described jumping screening the pulp is 2.8-3.2%, pH value 7-9.
8, technology according to claim 1 it is characterized in that described dogstail is a straw, and described jumping screening the pulp beating degree is 36-39 ° of SR.
9, technology according to claim 1 is characterized in that described dogstail is a wheat straw, and the beating degree of described jumping screening the pulp slurry is 22-25 ° of SR.
10, technology according to claim 1 is characterized in that temperature 60-70 ℃ in the washing process, the weight in wet base 1.8-2.1g of the slurry that obtains after the washing, and the concentration of the slurry that obtains after the washing is 9-14%.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2007101431315A CN100395404C (en) | 2007-08-03 | 2007-08-03 | Scouring process for grass pulping course |
| PCT/CN2008/001377 WO2009015555A1 (en) | 2007-07-27 | 2008-07-25 | Grass paper pulp used by papermaking and preparation method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2007101431315A CN100395404C (en) | 2007-08-03 | 2007-08-03 | Scouring process for grass pulping course |
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| CN101082188A true CN101082188A (en) | 2007-12-05 |
| CN100395404C CN100395404C (en) | 2008-06-18 |
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| CNB2007101431315A Active CN100395404C (en) | 2007-07-27 | 2007-08-03 | Scouring process for grass pulping course |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103243598A (en) * | 2013-05-14 | 2013-08-14 | 佳木斯龙江福浆纸有限公司 | Pulping method for increasing extraction ratio of black liquor |
| CN107604731A (en) * | 2017-11-02 | 2018-01-19 | 山东东平容业达植物纤维科技有限公司 | A kind of bleaching process in stalk fibre extraction process |
| CN111850701A (en) * | 2020-07-29 | 2020-10-30 | 湖南国麻新材料科技有限责任公司 | Degumming method for ramie |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1410627A (en) * | 2002-09-16 | 2003-04-16 | 成都春天绿竹资源开发有限责任公司 | Production technology of pure natural antibacterial bamboo paste |
-
2007
- 2007-08-03 CN CNB2007101431315A patent/CN100395404C/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103243598A (en) * | 2013-05-14 | 2013-08-14 | 佳木斯龙江福浆纸有限公司 | Pulping method for increasing extraction ratio of black liquor |
| CN103243598B (en) * | 2013-05-14 | 2016-09-21 | 佳木斯龙江福浆纸有限公司 | A kind of pulping process improving extraction rate of black liquor |
| CN107604731A (en) * | 2017-11-02 | 2018-01-19 | 山东东平容业达植物纤维科技有限公司 | A kind of bleaching process in stalk fibre extraction process |
| CN111850701A (en) * | 2020-07-29 | 2020-10-30 | 湖南国麻新材料科技有限责任公司 | Degumming method for ramie |
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| CN100395404C (en) | 2008-06-18 |
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Effective date of registration: 20110125 Address after: Shandong province Gaotang County Road 252800 Street No. 26 Patentee after: Shandong Fuyin Paper Making Environmental Protection Technology Co., Ltd. Address before: 252800 No. 15 Guangming East Road, Gaotang County, Shandong Province Patentee before: Shandong Tralin Paper Co., Ltd. |
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| PE01 | Entry into force of the registration of the contract for pledge of patent right |
Denomination of invention: Scouring process for grass pulping course Effective date of registration: 20140211 Granted publication date: 20080618 Pledgee: China Development Bank Co Pledgor: Shandong Quanlin Paper Industry Co. Ltd.|Shandong Fuyin Paper Environmental Technology Co. Ltd. Registration number: 2014990000101 |
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| PLDC | Enforcement, change and cancellation of contracts on pledge of patent right or utility model |