CN112813713A - Preparation method of special pulp for producing lyocell fibers from bamboo willows - Google Patents
Preparation method of special pulp for producing lyocell fibers from bamboo willows Download PDFInfo
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- 235000017166 Bambusa arundinacea Nutrition 0.000 title claims abstract description 50
- 235000017491 Bambusa tulda Nutrition 0.000 title claims abstract description 50
- 241001330002 Bambuseae Species 0.000 title claims abstract description 50
- 235000015334 Phyllostachys viridis Nutrition 0.000 title claims abstract description 50
- 239000011425 bamboo Substances 0.000 title claims abstract description 50
- 229920000433 Lyocell Polymers 0.000 title claims abstract description 37
- 238000002360 preparation method Methods 0.000 title claims abstract description 16
- 241000218998 Salicaceae Species 0.000 title claims abstract description 10
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 82
- 239000001301 oxygen Substances 0.000 claims abstract description 82
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 82
- 238000004061 bleaching Methods 0.000 claims abstract description 50
- 238000005406 washing Methods 0.000 claims abstract description 47
- 241000124033 Salix Species 0.000 claims abstract description 44
- 238000010411 cooking Methods 0.000 claims abstract description 29
- 238000012216 screening Methods 0.000 claims abstract description 29
- 230000020477 pH reduction Effects 0.000 claims abstract description 25
- 238000004519 manufacturing process Methods 0.000 claims abstract description 14
- 230000009920 chelation Effects 0.000 claims abstract description 10
- 230000007935 neutral effect Effects 0.000 claims abstract description 8
- 239000004576 sand Substances 0.000 claims abstract description 6
- 238000000034 method Methods 0.000 claims description 66
- OSVXSBDYLRYLIG-UHFFFAOYSA-N dioxidochlorine(.) Chemical compound O=Cl=O OSVXSBDYLRYLIG-UHFFFAOYSA-N 0.000 claims description 52
- 239000002002 slurry Substances 0.000 claims description 46
- 238000006243 chemical reaction Methods 0.000 claims description 39
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 33
- 239000004155 Chlorine dioxide Substances 0.000 claims description 22
- 235000019398 chlorine dioxide Nutrition 0.000 claims description 22
- 239000002023 wood Substances 0.000 claims description 22
- 239000003513 alkali Substances 0.000 claims description 17
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 claims description 16
- 238000007599 discharging Methods 0.000 claims description 12
- 238000002156 mixing Methods 0.000 claims description 12
- 235000011121 sodium hydroxide Nutrition 0.000 claims description 11
- KCXVZYZYPLLWCC-UHFFFAOYSA-N EDTA Chemical compound OC(=O)CN(CC(O)=O)CCN(CC(O)=O)CC(O)=O KCXVZYZYPLLWCC-UHFFFAOYSA-N 0.000 claims description 9
- 230000036284 oxygen consumption Effects 0.000 claims description 9
- 238000005086 pumping Methods 0.000 claims description 9
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims description 8
- 238000000605 extraction Methods 0.000 claims description 8
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 claims description 6
- 239000000460 chlorine Substances 0.000 claims description 6
- 229910052801 chlorine Inorganic materials 0.000 claims description 6
- 238000003795 desorption Methods 0.000 claims description 6
- 230000007062 hydrolysis Effects 0.000 claims description 6
- 238000006460 hydrolysis reaction Methods 0.000 claims description 6
- 230000014759 maintenance of location Effects 0.000 claims description 6
- 239000000463 material Substances 0.000 claims description 5
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims description 4
- 238000005520 cutting process Methods 0.000 claims description 4
- 239000000413 hydrolysate Substances 0.000 claims description 4
- 239000000203 mixture Substances 0.000 claims description 4
- 238000004321 preservation Methods 0.000 claims description 4
- 239000000047 product Substances 0.000 claims description 4
- 230000000630 rising effect Effects 0.000 claims description 4
- AKHNMLFCWUSKQB-UHFFFAOYSA-L sodium thiosulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=S AKHNMLFCWUSKQB-UHFFFAOYSA-L 0.000 claims description 4
- 235000019345 sodium thiosulphate Nutrition 0.000 claims description 4
- 238000003860 storage Methods 0.000 claims description 4
- 238000004073 vulcanization Methods 0.000 claims description 4
- 239000012752 auxiliary agent Substances 0.000 claims description 3
- 238000010923 batch production Methods 0.000 claims description 2
- 239000002738 chelating agent Substances 0.000 claims description 2
- 230000018044 dehydration Effects 0.000 claims description 2
- 238000006297 dehydration reaction Methods 0.000 claims description 2
- 239000007788 liquid Substances 0.000 claims description 2
- 150000007522 mineralic acids Chemical class 0.000 claims description 2
- 238000009740 moulding (composite fabrication) Methods 0.000 claims description 2
- 239000007787 solid Substances 0.000 claims description 2
- 229910001220 stainless steel Inorganic materials 0.000 claims description 2
- 239000010935 stainless steel Substances 0.000 claims description 2
- 239000000835 fiber Substances 0.000 abstract description 10
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 abstract description 4
- 229910021645 metal ion Inorganic materials 0.000 abstract description 4
- 238000006116 polymerization reaction Methods 0.000 abstract description 4
- 238000004537 pulping Methods 0.000 abstract description 3
- 230000000694 effects Effects 0.000 abstract description 2
- 239000002994 raw material Substances 0.000 description 7
- 229920001131 Pulp (paper) Polymers 0.000 description 4
- 241000219000 Populus Species 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 239000002904 solvent Substances 0.000 description 3
- 241000196324 Embryophyta Species 0.000 description 2
- 229920002678 cellulose Polymers 0.000 description 2
- 239000001913 cellulose Substances 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 229960001484 edetic acid Drugs 0.000 description 2
- 238000007380 fibre production Methods 0.000 description 2
- 238000011068 loading method Methods 0.000 description 2
- 238000005507 spraying Methods 0.000 description 2
- 229920002994 synthetic fiber Polymers 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 229920003043 Cellulose fiber Polymers 0.000 description 1
- 229920000875 Dissolving pulp Polymers 0.000 description 1
- 241000892673 Himalayacalamus hookerianus Species 0.000 description 1
- 229920000297 Rayon Polymers 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000003044 adaptive effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000029087 digestion Effects 0.000 description 1
- ZZUFCTLCJUWOSV-UHFFFAOYSA-N furosemide Chemical compound C1=C(Cl)C(S(=O)(=O)N)=CC(C(O)=O)=C1NCC1=CC=CO1 ZZUFCTLCJUWOSV-UHFFFAOYSA-N 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 229920005610 lignin Polymers 0.000 description 1
- 231100000252 nontoxic Toxicity 0.000 description 1
- 230000003000 nontoxic effect Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 239000004627 regenerated cellulose Substances 0.000 description 1
- 239000012209 synthetic fiber Substances 0.000 description 1
Classifications
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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
- D21B1/04—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres
- D21B1/06—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres by dry methods
- D21B1/061—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres by dry methods using cutting devices
-
- 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
- D21C1/02—Pretreatment of the finely-divided materials before digesting with water or steam
-
- 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
- D21C7/00—Digesters
-
- 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
- D21C9/00—After-treatment of cellulose pulp, e.g. of wood pulp, or cotton linters ; Treatment of dilute or dewatered pulp or process improvement taking place after obtaining the raw cellulosic material and not provided for elsewhere
- D21C9/02—Washing ; Displacing cooking or pulp-treating liquors contained in the pulp by fluids, e.g. wash water or other pulp-treating agents
-
- 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
- D21C9/00—After-treatment of cellulose pulp, e.g. of wood pulp, or cotton linters ; Treatment of dilute or dewatered pulp or process improvement taking place after obtaining the raw cellulosic material and not provided for elsewhere
- D21C9/10—Bleaching ; Apparatus therefor
- D21C9/1057—Multistage, with compounds cited in more than one sub-group D21C9/10, D21C9/12, D21C9/16
-
- 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
- D21C9/00—After-treatment of cellulose pulp, e.g. of wood pulp, or cotton linters ; Treatment of dilute or dewatered pulp or process improvement taking place after obtaining the raw cellulosic material and not provided for elsewhere
- D21C9/10—Bleaching ; Apparatus therefor
- D21C9/12—Bleaching ; Apparatus therefor with halogens or halogen-containing compounds
- D21C9/14—Bleaching ; Apparatus therefor with halogens or halogen-containing compounds with ClO2 or chlorites
- D21C9/144—Bleaching ; Apparatus therefor with halogens or halogen-containing compounds with ClO2 or chlorites with ClO2/Cl2 and other bleaching agents in a multistage process
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21D—TREATMENT OF THE MATERIALS BEFORE PASSING TO THE PAPER-MAKING MACHINE
- D21D5/00—Purification of the pulp suspension by mechanical means; Apparatus therefor
- D21D5/02—Straining or screening the pulp
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- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Wood Science & Technology (AREA)
- Mechanical Engineering (AREA)
- Paper (AREA)
Abstract
A preparation method of special pulp for producing lyocell fibers from bamboo willows belongs to the technical field of pulp pulping. Comprises the following steps: bamboo willow slices preparation, neutral high-temperature prehydrolysis, alkaline high-temperature cooking, coarse pulp washing and screening, oxygen delignification, multi-section bleaching, multi-section washing, acidification and chelation treatment, low-concentration sand removal and screening and pulp making of finished products. The invention has the technical effects and advantages that: the metal ions have great influence on the production of the lyocell fibers, and the removal rate of the metal ions in the fibers is higher after acidification in the production process; the quality indexes of the bamboo willow pulp special for the lyocell fiber produced by the invention are as follows: polymerization degree: 450-650, alpha cellulose is more than or equal to 91%, R10 is more than or equal to 91%, R18 is more than or equal to 93%, ash content is less than or equal to 0.1%, Fe is less than or equal to 2.0ppm, Ca is less than or equal to 50ppm, Mg is less than or equal to 50ppm, and whiteness is more than or equal to 92%.
Description
Technical Field
The invention belongs to the technical field of pulp pulping, and relates to a preparation method of special pulp for producing lyocell fibers by bamboo willow.
Background
Lyocell fiber (Lyocell) is commonly called as "velveteen", is made from natural plant fiber as a raw material, is known in the middle of the 90 s of the 20 th century, and is known as the most valuable product in artificial fiber history in the last half century. The Lyocell fiber has various excellent performances of natural fiber and synthetic fiber, Lyocell is green fiber, raw materials of Lyocell are inexhaustible cellulose in nature, a production process has no chemical reaction, a used solvent is nontoxic, the recovery rate of the solvent can reach more than 99%, and the production process is green and environment-friendly, so the Lyocell fiber is called as '21 st century green fiber'.
The lyocell fiber industry has a monopoly status, foreign countries begin to basically monopolize the austria lanjing company, the productivity is small, in recent years, along with further digestion and absorption of the lyocell fiber production technology by domestic enterprises, the lyocell fiber production technology slowly becomes a relatively mature solvent method regenerated cellulose fiber industrial production technology, the single-line production capacity of new projects in China is further improved, the lyocell industry in China is steadily developed, and the capacity of 100 million tons of productivity is expected to be achieved in the coming years.
The raw material for producing the special pulp for the lyocell fibers is wood (broadleaf wood or needle-leaved wood), and because the market demand is small, the production factory is mainly in the countries such as the United states, south Africa and the like at present, the productivity is small, and the total yield is low; no manufacturers for producing the pulp special for the lyocell fiber exist in China. The domestic wood pulp is mainly dissolving pulp for making paper pulp and common viscose fiber.
The bamboo willow is a new hybrid variety of willow and bamboo, is a new willow plant of Salix genus of Salicaceae family introduced from the United states in recent years, has plant points between willow and bamboo, has wide adaptability in the national range, and has wide range of cultivation areas. The bamboo willows are divided into different strains according to different adaptive areas and characteristics, and only a plurality of strains of non-blue bamboo willows, bamboo willow No. 5 and bamboo willow No. 3 are stored at present. The bamboo willow has great growth potential and high growth speed, and the height of the bamboo willow can reach more than 20 meters. Research institutions in China research the characteristics of the wood properties, the fiber quality and the pulping performance of the bamboo willows, and research results show that the wood density of the bamboo willows is 0.384-0.443 g/cm3A range; the ash content, cold and hot water extract and 1% NaOH extract of bamboo willow are higher than those of fast-growing poplar but lower than those of hybrid tree, the content of lignin and pentosan is equivalent to that of fast-growing poplar, but the content of cellulose is 3% lower than that of fast-growing poplar, the average fiber length of bamboo willow is 0.84mm, and fiber cellsThe wall is thin, the wall cavity ratio is small, the method is suitable for producing paper pulp, the paper pulp is an excellent raw material for papermaking, the introduction and planting time is not long, the application of the method in China for the papermaking industry is still limited in the laboratory stage at present, and the method belongs to the blank for the application of the method for producing lyocell fibers.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides a preparation method of special pulp for producing lyocell fibers by bamboo willow.
A preparation method of special pulp for producing lyocell fibers by bamboo willow comprises the following steps: bamboo willow slices preparation, neutral high-temperature prehydrolysis, alkaline high-temperature cooking, coarse pulp washing and screening, oxygen delignification, multi-section bleaching, multi-section washing, acidification and chelation treatment, low-concentration sand removal and screening and pulp making of finished products.
The invention has the technical effects and advantages that: the metal ions have great influence on the production of the lyocell fibers, and the removal rate of the metal ions in the fibers is higher after acidification in the production process; the quality indexes of the bamboo willow pulp special for the lyocell fiber produced by the invention are as follows: polymerization degree: 450-650, alpha cellulose is more than or equal to 91%, R10 is more than or equal to 91%, R18 is more than or equal to 93%, ash content is less than or equal to 0.1%, Fe is less than or equal to 2.0ppm, Ca is less than or equal to 50ppm, Mg is less than or equal to 50ppm, and whiteness is more than or equal to 92%.
Detailed Description
It will be apparent that those skilled in the art can make many modifications and variations based on the spirit of the present invention.
As used herein, the singular forms "a", "an", "the" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. It will be understood that when an element, component or section is referred to as being "connected" to another element, component or section, it can be directly connected to the other element or section or intervening elements or sections may also be present. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
It will be understood by those skilled in the art that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art.
The following examples are further illustrative in order to facilitate the understanding of the embodiments, and the present invention is not limited to the examples.
Example 1:
a method for preparing special pulp for producing lyocell fibers by using bamboo willows, which widens the production method and the raw material source of the special pulp for the lyocell fibers.
The method comprises the following process steps: bamboo willow slices preparation, neutral high-temperature prehydrolysis, alkaline high-temperature cooking, coarse pulp washing and screening, oxygen delignification, multi-section bleaching, multi-section washing, acidification and chelation treatment, low-concentration sand removal and screening and pulp making of finished products.
The method comprises the following specific steps:
step 1), bamboo willow slicing and material preparation: the raw wood bamboo willow is cut into wood chips, and the wood chips are 15-25 mm long, 3-5 mm thick and 20mm wide.
Step 2), neutral high-temperature prehydrolysis: the reaction tower is a vertical stainless steel tower, the upper part is fed in and the lower part is discharged out, the batch production is carried out, and the hydrolysate can be circulated strongly; during hydrolysis, the temperature is 150-175 ℃, and the time is 30-180 min;
step 3), the alkaline high-temperature cooking process comprises the following steps: in the initial stage of cooking, firstly, hot cooking liquor is filled into a pot to enable the temperature in the pot to reach a higher temperature, the alkali consumption (caustic soda) of the cooking liquor is 12-28%, the vulcanization degree is 10-40%, the liquor ratio is 1: 2-5, then the hot cooking liquor is directly heated and cooked, steam is heated to the highest temperature of 155-170 ℃, and the heat preservation time is 40-80 min. And pumping and putting the pot after the cooking is finished.
Step 4), coarse pulp washing and screening: the coarse pulp from the cooking process is first screened in a combined screening and removing section, the fine pulp is washed in a double-roller pulp washer to extract black liquor, and the washed pulp enters an oxygen delignification system. Washing can be carried out by using multi-section washing equipment, strong dehydration and replacement are combined with each other, the extraction rate is high, and the washing factor is high; the washing of the unbleached pulp is primarily to remove solids dissolved in the pulp during cooking and to prepare the pulp for the subsequent oxygen delignification stage.
Step 5), oxygen delignification process: the method comprises the steps of adopting a two-stage oxygen delignification process, directly dropping 10% slurry into a vertical pipe in front of a medium consistency slurry pump, simultaneously adding low-pressure steam and NaOH solution into the vertical pipe, then pumping the mixture into a medium consistency mixer by using a medium consistency pump, adding oxygen and medium-pressure steam into the mixer, fully mixing the slurry with the steam and the oxygen, then entering a rising tower from the bottom of a first-stage oxygen delignification reaction tower for oxygen delignification reaction, discharging the slurry after the oxygen delignification reaction into the vertical pipe in front of the medium consistency slurry pump in a second-stage oxygen delignification reaction tower through a discharger at the top of the tower, and discharging the slurry after a secondary oxygen delignification reaction into a slurry storage tower. The pulp after oxygen removal is washed by multi-stage washing equipment and then enters a bleaching process. Alkali amount for oxygen removal step: 2% -4%, first-stage oxygen consumption: 3% -4%, the residence time of the first-stage oxygen desorption is 30-60 min, the temperature is 80-90 ℃, and the second-stage oxygen consumption: 1-2%, retention time 60min, temperature 70-90 ℃. PH is more than or equal to 11 at the end of oxygen desorption
Step 6), multi-stage bleaching process: the bleaching adopts a three-stage bleaching process, which comprises a primary chlorine dioxide bleaching process, an oxygen enhanced alkali extraction process and a secondary chlorine dioxide bleaching process; the specific operation steps are as follows:
step a, a primary chlorine dioxide bleaching process: sending the unbleached pulp subjected to oxygen delignification to a chlorine dioxide mixer by using a medium-concentration pump, then sending the chlorine dioxide mixer into a bleaching tower, enabling the pulp to perform upflow reaction in the tower, then discharging the pulp into a medium-concentration pump through a top pulp scraper device, sending the pulp into a pulp washer for washing, and sending the washed pulp into the medium-concentration pump. The concentration of the slurry in the process is about 10 percent, and the dosage of chlorine dioxide added into the mixer is 1 to 1.5 percent; the pulp of the bleaching tower stays for 120-180 min at the temperature of 70-90 ℃;
step b, oxygen enhanced alkali extraction: adding NaOH solution into a vertical pipe of a medium concentration pump, adding alkali to adjust the pH value to 10-12, then sending the slurry to an upflow reaction tower, adding oxygen, hydrogen peroxide and steam before the slurry enters the reaction tower, and mixing by using a mixer. The pulp from the reaction tower enters a pulp washer through a medium-concentration pump for washing again. The using amount of the oxygen is 0.5-1%, and the using amount of the hydrogen peroxide is 1% -1.5%; the pulp of the bleaching tower stays for 30-60 min at the temperature of 70-90 ℃;
step c, secondary chlorine dioxide bleaching process: the washed pulp is pumped into a mixer by a medium-concentration pump to be added with ClO2And mixing the solutions, sending the mixed pulp to a bleaching tower again, adding steam before the pulp enters a reaction tower, enabling the pulp to perform upflow reaction in the tower, then discharging the pulp into a medium-concentration pump through a top pulp scraper device, and sending the pulp to a pulp washer for washing again. Adding sodium thiosulfate into the washed slurry to remove residual chlorine. The using amount of the chlorine dioxide is 0.5 to 1 percent; the pulp of the bleaching tower stays for 60-120 min at the temperature of 70-80 ℃;
step 7), acidification and chelation treatment process: the washed slurry enters an acidification tower (tank) for acidification, inorganic acid sulfuric acid or hydrochloric acid and steam are added before entering the tower, and a chelating agent auxiliary agent is added after acidification. At the time of acidification, the slurry concentration is 5%, PH: 1-2, the temperature is 30-50 ℃, the time is 30-60 min, and the use amount of EDTA is 0.1%. The acidified pulp is sent to a pulp washer for washing again.
Step 8), a low-concentration desanding screening step and a pulp manufacturing step, wherein the pulp is washed in multiple sections again, subjected to low-concentration desanding screening, and screened by adopting a selection system combining three sections of fine screens and two sections of low-concentration desanding, wherein the pulp concentration is 1%, and a long-mesh multi-cylinder paper machine or a mesh-sandwiched air cushion pulp machine is used for manufacturing and cutting and forming. The finished pulp is 800x600 specification or roll pulp.
Example 2:
a method for preparing pulp special for producing Lyocell fiber by using bamboo willow uses bamboo willow as a raw material and comprises the following process steps: bamboo willow slices are prepared, neutral high-temperature prehydrolysis, alkaline high-temperature cooking, coarse pulp washing and screening, oxygen delignification, multi-section bleaching, multi-section washing, acidification and chelation treatment, low-concentration sand removal and screening, and finished pulp is manufactured by paper making. Wherein:
step 1, bamboo willow slicing and material preparation: peeling raw wood bamboo willow, cutting the raw wood bamboo willow into wood chips, and screening qualified wood chips by using a wood chip screen, wherein the wood chips are 15-25 mm long, 3-5 mm thick and 20mm wide.
Step 2, prehydrolysis: feeding the qualified wood chips into the top of a hydrolysis tower by a feeding screw, loading the mixed steam into the tower, introducing steam into the tower, heating to 160 ℃, and keeping the temperature for 50 min; and after the hydrolysis is finished, extracting hydrolysate.
And 3, alkaline high-temperature cooking: the alkali consumption of the cooking liquor is 22%, the vulcanization degree is 30%, the liquor ratio is 1: 4.5, cooking is carried out according to the cooking program, steam heating is carried out until the maximum temperature is 165 ℃, and the heat preservation time is 60 min. And pumping the spraying pot after the cooking is finished.
And 4, washing and screening coarse pulp: firstly, screening by a combined screening and removing section, washing good pulp by a two-channel double-roller pulp washer, and performing oxygen delignification on the washed pulp;
step 5, oxygen delignification process: the method comprises the steps of adopting a two-stage oxygen delignification process, directly dropping 10% slurry into a vertical pipe in front of a medium consistency slurry pump, simultaneously adding low-pressure steam and NaOH solution into the vertical pipe, then pumping the mixture into a medium consistency mixer by using a medium consistency pump, adding oxygen and medium-pressure steam into the mixer, fully mixing the slurry with the steam and the oxygen, then entering a rising tower from the bottom of a first-stage oxygen delignification reaction tower for oxygen delignification reaction, discharging the slurry after the oxygen delignification reaction into the vertical pipe in front of the medium consistency slurry pump in a second-stage oxygen delignification reaction tower through a discharger at the top of the tower, and discharging the slurry after a secondary oxygen delignification reaction into a slurry storage tower. The pulp after oxygen removal is washed by multi-stage washing equipment and then enters a bleaching process. Alkali amount for oxygen removal step: 3%, first-stage oxygen dosage: 4%, first-stage oxygen removal retention time of 40min, temperature of 80 ℃, second-stage oxygen consumption: 2%, retention time 60min, temperature 80 ℃. PH is more than or equal to 11.5 at the end of oxygen desorption
Step 6, a multi-stage bleaching process:
(1) primary ClO2Bleaching process: the pulp with the concentration of 10 percent after oxygen delignification is pumped into a chlorine dioxide mixer by a medium-concentration pump and then enters an up-flow bleaching tower, and ClO is added into the mixer2The using amount is 1.5 percent; introducing steam, and standing the slurry for 90min at 80 deg.C; the medium consistency pump is then sent to a two-roll washer for washing.
(2) And an oxygen enhanced alkali extraction process: the washed slurry with the concentration of 10 percent is sent into an upflow reaction tower by a medium consistency pump; adding NaOH solution into a vertical pipe of a medium concentration pump, adjusting the pH value to 12, adding oxygen, hydrogen peroxide and steam, and mixing by using a mixer. The oxygen consumption is 1 percent, and the hydrogen peroxide consumption is 1 percent; the pulp of the bleaching tower stays for 60min at the temperature of 80 ℃; the pulp from the reaction tower enters a double-roller pulp washer through a medium-consistency pump for washing again.
(3) Secondary ClO2Bleaching process: sending the washed pulp to the mixer again through a medium-concentration pump to be added with ClO2Mixing the solutions, adding steam, and feeding the mixed pulp into an upflow bleaching tower again, wherein the using amount of chlorine dioxide is 1%; the pulp of the bleaching tower stays for 60min at the temperature of 80 ℃; then discharged into a medium consistency pump through a top pulp scraper device and sent to a double-roller pulp washer for washing again. Adding sodium thiosulfate into the washed slurry to remove residual chlorine. And (4) removing residual chlorine completely.
And 7, acidification and chelation treatment process: the slurry after washing, the concentration of the low thick liquid pump is 5 percent is sent into an acidification tower for acidification, and is added with a mixer or hydrochloric acid, steam and ethylene diamine tetraacetic acid EDTA agent before entering the tower. (ethylenediaminetetraacetic acid, EDTA for short, is an auxiliary agent) PH: less than or equal to 2, the temperature is 40 ℃, the dosage of EDTA is 0.1 percent, and the time is 60 min. The acidified pulp is sent to a double-roller pulp washer for washing again.
Step 8, a papermaking process: the pulp is screened by low-concentration desanding, a selection system combining three sections of fine screens and two sections of low-concentration desanding is adopted, the pulp concentration is 1% during screening, and the pulp is manufactured and rolled by a mesh air cushion pulp machine.
The quality indexes of the produced bamboo willow pulp special for the lyocell fiber are as follows:
polymerization degree: 483, alpha-cellulose 91.6%, R10: 91.8%, R18: 92%, ash content: 0.09%, Fe: 2.0ppm, whiteness: 92 percent.
Example 3:
a method for preparing pulp special for producing Lyocell fiber by using bamboo willow uses bamboo willow as a raw material and comprises the following process steps: preparing bamboo willow materials, performing neutral high-temperature prehydrolysis, performing alkaline high-temperature cooking, washing and screening coarse pulp, performing oxygen delignification, bleaching in multiple sections, washing in multiple sections, performing acidification and chelation treatment, performing low-concentration sand removal screening, and making finished pulp by using paper. Wherein:
step 1, bamboo willow material preparation: the bamboo willow chips are purchased outside, the water content of the wood chips is 42%, the qualified rate of the wood chips is more than 99%, the qualified wood chips are 15-25 mm long, 3-5 mm thick and 20mm wide.
Step 2, prehydrolysis: feeding the wood chips into the top of a hydrolysis tower by a feeding screw, loading the mixed steam into the tower, introducing steam into the tower, heating to 165 ℃ for 60 min; and after the hydrolysis is finished, extracting hydrolysate.
And 3, alkaline high-temperature cooking: the alkali consumption of the cooking liquor is 25%, the vulcanization degree is 35%, the liquor ratio is 1: 4.5, cooking is carried out according to the cooking program, steam is heated to the highest temperature of about 165 ℃, and the heat preservation time is 60 min. And pumping the spraying pot after the cooking is finished.
And 4, washing and screening coarse pulp: firstly, screening by a combined screening and removing section, washing good pulp by a two-channel double-roller pulp washer, and performing oxygen delignification on the washed pulp;
step 5, oxygen delignification process: the method comprises the steps of adopting a two-stage oxygen delignification process, directly dropping 10% slurry into a vertical pipe in front of a medium consistency slurry pump, simultaneously adding low-pressure steam and NaOH solution into the vertical pipe, then pumping the mixture into a medium consistency mixer by using a medium consistency pump, adding oxygen and medium-pressure steam into the mixer, fully mixing the slurry with the steam and the oxygen, then entering a rising tower from the bottom of a first-stage oxygen delignification reaction tower for oxygen delignification reaction, discharging the slurry after the oxygen delignification reaction into the vertical pipe in front of the medium consistency slurry pump in a second-stage oxygen delignification reaction tower through a discharger at the top of the tower, and discharging the slurry after a secondary oxygen delignification reaction into a slurry storage tower. The pulp after oxygen removal is washed by multi-stage washing equipment and then enters a bleaching process. Alkali amount for oxygen removal step: 4%, first-stage oxygen dosage: 4%, first-stage oxygen removal retention time of 40min, temperature of 80 ℃, second-stage oxygen consumption: 2%, retention time 60min, temperature 80 ℃. PH is more than or equal to 11.5 at the end of oxygen desorption
Step 6, a multi-stage bleaching process:
(1) primary ClO2Bleaching process: the pulp with the concentration of 10 percent after oxygen delignification is pumped into a chlorine dioxide mixer by a medium-concentration pump and then enters an up-flow bleaching tower, and ClO is added into the mixer2The using amount is 1.5 percent; introducing steam, and standing the slurry for 90min at 80 deg.C; then medium concentrationAnd pumping to a double-roller washer for washing.
(2) And an oxygen enhanced alkali extraction process: the washed slurry with the concentration of 10 percent is sent into an upflow reaction tower by a medium consistency pump; adding NaOH solution into a vertical pipe of a medium concentration pump, adjusting the pH value to 12, adding oxygen, hydrogen peroxide and steam, and mixing by using a mixer. The oxygen consumption is 1 percent, and the hydrogen peroxide consumption is 1.5 percent; the pulp of the bleaching tower stays for 60min at the temperature of 80 ℃; the pulp from the reaction tower enters a double-roller pulp washer through a medium-consistency pump for washing again.
(3) Secondary ClO2Bleaching process: sending the washed pulp to the mixer again through a medium-concentration pump to be added with ClO2Mixing the solutions, adding steam, and feeding the mixed pulp into an upflow bleaching tower again, wherein the using amount of chlorine dioxide is 1%; the pulp of the bleaching tower stays for 60min at the temperature of 80 ℃; then discharged into a medium consistency pump through a top pulp scraper device and sent to a double-roller pulp washer for washing again. Adding sodium thiosulfate into the washed slurry to remove residual chlorine. And (4) removing residual chlorine completely.
And 7, acidification and chelation treatment process: the slurry after washing, the concentration of the low thick slurry pump is 5 percent is sent into an acidification tower for acidification, and is added with a mixer or hydrochloric acid, steam and EDTA agent before entering the tower. pH during acidification: less than or equal to 2, the temperature is 40 ℃, the dosage of EDTA is 0.1 percent, and the time is 60 min. The acidified pulp is sent to a double-roller pulp washer for washing again.
Step 8, a papermaking process: the pulp is screened by low-concentration desanding, a selection system combining three sections of fine screens and two sections of low-concentration desanding is adopted, the pulp concentration is 1% during screening, and the pulp is manufactured and rolled by a mesh air cushion pulp machine.
The quality indexes of the produced bamboo willow pulp special for the lyocell fiber are as follows:
polymerization degree: 467, alpha cellulose 91.2%, R10: 91.3%, R18: 92.6%, ash: 0.09%, Fe: 2.0ppm, whiteness: 92 percent of
As described above, although the embodiments of the present invention have been described in detail, it will be apparent to those skilled in the art that many modifications are possible without substantially departing from the spirit and scope of the present invention. Therefore, such modifications are also all included in the scope of protection of the present invention.
Claims (8)
1. A preparation method of special pulp for producing lyocell fibers by bamboo willow is characterized by comprising the following steps: bamboo willow slices preparation, neutral high-temperature prehydrolysis, alkaline high-temperature cooking, coarse pulp washing and screening, oxygen delignification, multi-section bleaching, multi-section washing, acidification and chelation treatment, low-concentration sand removal and screening and pulp making of finished products.
2. The method for preparing the pulp special for producing the lyocell fiber from the bamboo willow according to claim 1, which is characterized by comprising the following specific steps of:
step 1), bamboo willow slicing and material preparation: cutting the raw wood bamboo willow into wood chips, wherein the wood chips are 15-25 mm long, 3-5 mm thick and 20mm wide;
step 2), neutral high-temperature prehydrolysis: the reaction tower is a vertical stainless steel tower, the upper part is fed in and the lower part is discharged out, the batch production is carried out, and the hydrolysate can be circulated strongly; during hydrolysis, the temperature is 150-175 ℃, and the time is 30-180 min;
step 3), the alkaline high-temperature cooking process comprises the following steps: at the initial stage of cooking, firstly, putting the hot cooking liquid into a pot to enable the temperature in the pot to reach higher temperature; pumping and putting the pot after the cooking is finished;
step 4), coarse pulp washing and screening: coarse pulp from a cooking process is firstly screened by a combined screening node, fine pulp is sent to a double-roller pulp washer to be washed, black liquor is extracted, and the washed pulp enters an oxygen delignification system; washing can be carried out by using multi-section washing equipment, and strong dehydration and replacement are combined with each other; the unbleached pulp is mainly washed to remove solid matters dissolved in the pulp in the cooking process and prepare for the subsequent oxygen delignification stage of the pulp;
step 5), oxygen delignification process: adopting a two-stage oxygen delignification process, directly dropping 10% slurry into a vertical pipe in front of a medium consistency slurry pump, simultaneously adding low-pressure steam and NaOH solution at the vertical pipe, then pumping the mixture into a medium consistency mixer by using a medium consistency pump, adding oxygen and medium-pressure steam in front of the mixer, fully mixing the slurry with the steam and the oxygen, then entering a rising tower from the bottom of a first-stage oxygen delignification reaction tower for oxygen delignification reaction, discharging the slurry after the oxygen delignification reaction into the vertical pipe in front of the medium consistency slurry pump of a second-stage oxygen delignification reaction tower through a discharger at the top of the tower, and discharging the slurry after the secondary oxygen delignification reaction into a slurry storage tower; the pulp after oxygen removal is washed by multi-section washing equipment and then enters a bleaching process;
step 6), multi-stage bleaching process: the bleaching adopts a three-stage bleaching process, which comprises a primary chlorine dioxide bleaching process, an oxygen enhanced alkali extraction process and a secondary chlorine dioxide bleaching process;
the specific operation steps are as follows:
step a, a primary chlorine dioxide bleaching process: sending the unbleached pulp subjected to oxygen delignification to a chlorine dioxide mixer by using a medium-concentration pump, then sending the chlorine dioxide mixer into a bleaching tower, enabling the pulp to perform upflow reaction in the tower, then discharging the pulp into a medium-concentration pump through a top pulp scraper device, sending the pulp into a pulp washer for washing, and sending the washed pulp into the medium-concentration pump;
step b, oxygen enhanced alkali extraction: adding a NaOH solution into a vertical pipe of a medium concentration pump, adding alkali to adjust the pH value to 10-12, then sending the slurry to an upflow reaction tower, adding oxygen, hydrogen peroxide and steam before the slurry enters the reaction tower, and mixing by using a mixer; the pulp from the reaction tower enters a pulp washer through a medium-concentration pump for washing again;
step c, secondary chlorine dioxide bleaching process: the washed pulp is pumped into a mixer by a medium-concentration pump to be added with ClO2Mixing the solutions, sending the mixed pulp to a bleaching tower again, adding steam before the pulp enters a reaction tower, enabling the pulp to perform upflow reaction in the tower, then discharging the pulp into a medium-concentration pump through a top pulp scraper device, and sending the pulp to a pulp washer for washing again; adding sodium thiosulfate into the washed pulp to remove residual chlorine;
step 7), acidification and chelation treatment process: the slurry after washing enters an acidification tower (tank) for acidification, inorganic acid sulfuric acid or hydrochloric acid and steam are added before entering the tower, and a chelating agent auxiliary agent is added after acidification;
step 8), a low-concentration desanding screening step and a pulp manufacturing step, wherein the pulp is washed in multiple sections again, subjected to low-concentration desanding screening, and screened by adopting a selection system combining three sections of fine screens and two sections of low-concentration desanding, wherein the pulp concentration is 1%, and a long-mesh multi-cylinder paper machine or a mesh-sandwiched air cushion pulp machine is used for manufacturing and cutting and forming. The finished pulp is 800x600 specification or roll pulp.
3. The preparation method of the pulp special for producing the lyocell fibers from the bamboo willows, according to claim 2, is characterized in that the alkali consumption (caustic soda) of the cooking liquor in the step 3) is 12-28%, the vulcanization degree is 10-40%, the liquor ratio is 1: 2-5, then the pulp is directly heated and cooked, steam is heated to the maximum temperature of 155-170 ℃, and the heat preservation time is 40-80 min.
4. The method for preparing the pulp special for producing the lyocell fiber from the bamboo willow according to claim 2, wherein the alkali consumption in the oxygen removal process in the step 5) is as follows: 2% -4%, first-stage oxygen consumption: 3% -4%, the residence time of the first-stage oxygen desorption is 30-60 min, the temperature is 80-90 ℃, and the second-stage oxygen consumption: 1-2%, the retention time is 60min, and the temperature is 70-90 ℃; the PH value is more than or equal to 11 when the oxygen desorption is finished.
5. The method for preparing the pulp special for bamboo willow to produce lyocell fiber according to claim 2, wherein the pulp concentration of the primary chlorine dioxide bleaching process in the step a of the step 6) is about 10%, and the amount of chlorine dioxide added into the mixer is 1-1.5%; and (3) standing the pulp of the bleaching tower for 120-180 min at the temperature of 70-90 ℃.
6. The method for preparing the pulp special for producing the lyocell fiber from the bamboo willow according to claim 2, wherein the oxygen consumption in the oxygen reinforced alkali extraction process in the step b of the step 6) is 0.5-1%, and the hydrogen peroxide consumption is 1% -1.5%; and (3) standing the pulp of the bleaching tower for 30-60 min at the temperature of 70-90 ℃.
7. The method for preparing the pulp special for bamboo willow to produce lyocell fiber according to claim 2, wherein the amount of chlorine dioxide used in the secondary chlorine dioxide bleaching process in step c) of the step 6) is 0.5-1%; and (3) standing the pulp of the bleaching tower for 60-120 min at the temperature of 70-80 ℃.
8. The method for preparing the pulp special for producing the lyocell fiber from the bamboo willow according to claim 2, wherein the concentration of the pulp in the acidification in the step 7) is 5%, and the pH value is: 1-2, the temperature is 30-50 ℃, the time is 30-60 min, and the use amount of EDTA is 0.1%; the acidified pulp is sent to a pulp washer for washing again.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113250004A (en) * | 2021-05-31 | 2021-08-13 | 山东银鹰股份有限公司 | Clean pulping process of cotton pulp for lyocell fibers |
| CN114232378A (en) * | 2021-12-29 | 2022-03-25 | 泰盛科技（集团）股份有限公司 | Bamboo pulp preparation method and bamboo pulp |
| CN114960248A (en) * | 2022-06-30 | 2022-08-30 | 泰盛科技（集团）股份有限公司 | Preparation method of bamboo pulp for Lyocell fiber and product thereof |
Citations (19)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1293723A (en) * | 1998-03-16 | 2001-05-02 | 韦尔豪泽公司 | Lyocell fibers and compositions for making the same |
| CN1308160A (en) * | 2000-11-02 | 2001-08-15 | 河北吉藁化纤有限责任公司 | Technological process of producing viscose fiber size with bamboo and timber material |
| CN1811055A (en) * | 2006-02-28 | 2006-08-02 | 华南理工大学 | Production process of bleached chemical pulp with hemp stalk core |
| CN1970850A (en) * | 2006-10-25 | 2007-05-30 | 宜宾丝丽雅股份有限公司 | Method for making bamboo pulp for use in preparation of artificial fiber |
| CN1974921A (en) * | 2006-12-18 | 2007-06-06 | 河北吉藁化纤有限责任公司 | Method for producing bamboo pomace |
| JP2008501074A (en) * | 2005-04-27 | 2008-01-17 | ヒオク リー，クオン | Pulp manufacturing method using bamboo and pulp manufactured using this method |
| CN101148836A (en) * | 2007-11-12 | 2008-03-26 | 宜宾长毅浆粕有限责任公司 | Paper-making-stage bamboo wood pulp plate denaturalization producing technique |
| CN101158123A (en) * | 2007-11-15 | 2008-04-09 | 宜宾纸业股份有限公司 | High-strength bamboo pulp manufacturing technique |
| CN101701431A (en) * | 2008-07-16 | 2010-05-05 | 中国制浆造纸研究院 | Method for producing bleached pulp for viscose fibers from bamboo |
| CN101748630A (en) * | 2009-12-14 | 2010-06-23 | 昆明理工大学 | Acid-free pre-hydrolysis enzymolysis-free method for preparing bamboo pulp of Dendrocalamus giganteus Munro series |
| KR20110026635A (en) * | 2009-09-08 | 2011-03-16 | 황광성 | Method of manufacture pulp for bamboos fiber |
| CN102888772A (en) * | 2012-10-17 | 2013-01-23 | 四川永丰纸业股份有限公司 | Method for preparing bamboo pulp by replacing cooking sulfate with steaming sulfate |
| CN103334335A (en) * | 2013-07-12 | 2013-10-02 | 马志强 | Preparation method of pollution-free high-whiteness palm silk paper pulp and application of paper pulp in paper product |
| KR101528700B1 (en) * | 2014-01-15 | 2015-06-15 | 이권혁 | producting method of water-tissue |
| CN108252134A (en) * | 2018-01-24 | 2018-07-06 | 齐鲁工业大学 | A kind of method for reducing refining energy consumption in timber reducing rules preparation process |
| CN109778586A (en) * | 2017-11-15 | 2019-05-21 | 青岛凯玉盈商贸有限公司 | A kind of mulberry skin chemi-mechanical pulp |
| CN110616584A (en) * | 2019-07-05 | 2019-12-27 | 新疆塔里木农业综合开发股份有限公司 | Feasibility research method for bamboo willow raw material used for preparing dissolving pulp and viscose spinning |
| CN110904710A (en) * | 2019-11-06 | 2020-03-24 | 福建省青山纸业股份有限公司 | Bamboo pulp preparation process |
| CN111996828A (en) * | 2020-06-19 | 2020-11-27 | 新疆中泰纺织集团有限公司 | Method for realizing integrated production of pulp fibers by taking paper pulp as raw material |
-
2021
- 2021-01-07 CN CN202110018518.8A patent/CN112813713B/en active Active
Patent Citations (19)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1293723A (en) * | 1998-03-16 | 2001-05-02 | 韦尔豪泽公司 | Lyocell fibers and compositions for making the same |
| CN1308160A (en) * | 2000-11-02 | 2001-08-15 | 河北吉藁化纤有限责任公司 | Technological process of producing viscose fiber size with bamboo and timber material |
| JP2008501074A (en) * | 2005-04-27 | 2008-01-17 | ヒオク リー，クオン | Pulp manufacturing method using bamboo and pulp manufactured using this method |
| CN1811055A (en) * | 2006-02-28 | 2006-08-02 | 华南理工大学 | Production process of bleached chemical pulp with hemp stalk core |
| CN1970850A (en) * | 2006-10-25 | 2007-05-30 | 宜宾丝丽雅股份有限公司 | Method for making bamboo pulp for use in preparation of artificial fiber |
| CN1974921A (en) * | 2006-12-18 | 2007-06-06 | 河北吉藁化纤有限责任公司 | Method for producing bamboo pomace |
| CN101148836A (en) * | 2007-11-12 | 2008-03-26 | 宜宾长毅浆粕有限责任公司 | Paper-making-stage bamboo wood pulp plate denaturalization producing technique |
| CN101158123A (en) * | 2007-11-15 | 2008-04-09 | 宜宾纸业股份有限公司 | High-strength bamboo pulp manufacturing technique |
| CN101701431A (en) * | 2008-07-16 | 2010-05-05 | 中国制浆造纸研究院 | Method for producing bleached pulp for viscose fibers from bamboo |
| KR20110026635A (en) * | 2009-09-08 | 2011-03-16 | 황광성 | Method of manufacture pulp for bamboos fiber |
| CN101748630A (en) * | 2009-12-14 | 2010-06-23 | 昆明理工大学 | Acid-free pre-hydrolysis enzymolysis-free method for preparing bamboo pulp of Dendrocalamus giganteus Munro series |
| CN102888772A (en) * | 2012-10-17 | 2013-01-23 | 四川永丰纸业股份有限公司 | Method for preparing bamboo pulp by replacing cooking sulfate with steaming sulfate |
| CN103334335A (en) * | 2013-07-12 | 2013-10-02 | 马志强 | Preparation method of pollution-free high-whiteness palm silk paper pulp and application of paper pulp in paper product |
| KR101528700B1 (en) * | 2014-01-15 | 2015-06-15 | 이권혁 | producting method of water-tissue |
| CN109778586A (en) * | 2017-11-15 | 2019-05-21 | 青岛凯玉盈商贸有限公司 | A kind of mulberry skin chemi-mechanical pulp |
| CN108252134A (en) * | 2018-01-24 | 2018-07-06 | 齐鲁工业大学 | A kind of method for reducing refining energy consumption in timber reducing rules preparation process |
| CN110616584A (en) * | 2019-07-05 | 2019-12-27 | 新疆塔里木农业综合开发股份有限公司 | Feasibility research method for bamboo willow raw material used for preparing dissolving pulp and viscose spinning |
| CN110904710A (en) * | 2019-11-06 | 2020-03-24 | 福建省青山纸业股份有限公司 | Bamboo pulp preparation process |
| CN111996828A (en) * | 2020-06-19 | 2020-11-27 | 新疆中泰纺织集团有限公司 | Method for realizing integrated production of pulp fibers by taking paper pulp as raw material |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113250004A (en) * | 2021-05-31 | 2021-08-13 | 山东银鹰股份有限公司 | Clean pulping process of cotton pulp for lyocell fibers |
| CN114232378A (en) * | 2021-12-29 | 2022-03-25 | 泰盛科技（集团）股份有限公司 | Bamboo pulp preparation method and bamboo pulp |
| CN114960248A (en) * | 2022-06-30 | 2022-08-30 | 泰盛科技（集团）股份有限公司 | Preparation method of bamboo pulp for Lyocell fiber and product thereof |
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