CN107988835B - Method for preparing high-yield natural-color bamboo pulp by low-temperature displacement impregnation - Google Patents
Method for preparing high-yield natural-color bamboo pulp by low-temperature displacement impregnation Download PDFInfo
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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
- D21C3/00—Pulping cellulose-containing materials
- D21C3/02—Pulping cellulose-containing materials with inorganic bases or alkaline reacting compounds, e.g. sulfate processes
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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
- D21B1/12—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
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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
- D21C3/00—Pulping cellulose-containing materials
- D21C3/22—Other features of pulping processes
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Abstract
The invention discloses a method for preparing high-yield natural-color bamboo pulp by low-temperature displacement impregnation, which comprises the following steps: preparing materials, low-temperature dipping, replacing, squeezing pulp, secondary replacing and high-concentration grinding. According to the preparation method, the yield of the obtained pulp is 80-95%, the kappa number is above 80, the whiteness is 10-30% ISO, and the b value is 25-40.
Description
Technical Field
The invention belongs to the technical field of pulping and papermaking, and particularly relates to a method for preparing high-yield natural-color bamboo pulp by low-temperature displacement impregnation.
Background
The high-yield bamboo pulp mainly refers to unbleached bamboo pulp obtained by a chemical mechanical method, and the yield is generally over 60 percent. At present, the research of high-yield bamboo pulp at home and abroad is mainly applied to the preparation of newsprint, writing paper, liner paper or coated paper used as a core layer, and the high-yield bamboo pulp has certain requirements on whiteness so as to meet the requirements of end products. Therefore, the high-yield bamboo pulp is mainly bleached bamboo pulp.
In recent years, as people's knowledge of bamboos is deepened, the development of bamboo pulp is increased, and the concept of natural color of bamboos begins to enter the sight of people. The research on the natural color bamboo pulp is more active.
Patent 201410355005.6 discloses a method for preparing high-yield natural-color bamboo pulp, which adopts potassium hydroxide as cooking liquor, and the highest temperature reaches 120 ℃. However, the method can only obtain about 60 percent of yield, and in addition, the method uses more potassium hydroxide, so that the manufacturing cost cannot meet the market requirement of the existing high-yield pulp.
Patent 201610087921.5 discloses a method for preparing natural color bamboo pulp, which adopts sulfate cooking at 130 deg.C to obtain yield of only 55%, and the obtained pulp still has high yield.
Patent 200710034386 discloses a process for producing bamboo pulp by thermo-mechanical grinding, which adopts multiple softening technique, and the whole process basically does not use chemical raw materials, and has high yield and light environmental pollution, but the difficulty of large-scale industrial production is large, and the obtained bamboo pulp is hard and has poor pulp color. In the meantime, the ammonium sulfite method and the sulfite method are adopted to prepare the high-yield bamboo pulp, the yield can reach 65 percent or more, but the process has the disadvantages of sulfur dioxide generation, heavy load of environmental pollution and difficult wastewater treatment. The high-yield natural-color bamboo pulp prepared by adopting a wood chemical-mechanical pulp production line is also reported, but the COD of the discharged wastewater reaches more than 10000mg/L, the middle section water treatment system of the existing chemical pulp production line cannot treat the wastewater, a specially-built water treatment system is needed, the investment is increased, the power consumption of the pulping process is very high, the single machine installed power reaches about 3000KW, and the requirement on the power configuration of a plant area is higher.
At present, no report and literature exists for producing high-yield natural-color bamboo pulp by adopting a low-temperature replacement dipping technology in a pot.
Therefore, in many methods, a method which is good in quality, environment-friendly, economical and suitable for large-scale production is not available for preparing the high-yield natural-color bamboo pulp.
Disclosure of Invention
The invention aims to provide a method for producing high-yield natural-color bamboo pulp, which is energy-saving, efficient, low in investment and capable of realizing large-scale production.
The invention is realized in this way, and provides a method for preparing high-yield natural-color bamboo pulp by low-temperature replacement impregnation, which comprises the following steps: preparing materials, dipping at low temperature, replacing, extruding, replacing for the second time, and grinding at high concentration. The method is characterized in that:
(1) preparing materials: cutting bamboo into rectangular bamboo pieces with length of 20-50 mm and width of 10-20 mm, and washing with water;
(2) low-temperature impregnation: naturally filling the bamboo chips into a pot, adding hot water with the temperature of about 60 ℃ to control the liquid ratio to be 2-4: 1, simultaneously adding impregnation alkali, wherein the alkali dosage is 4-10% of that of the absolutely dry bamboo chips, adding low-pressure steam to control the temperature in the pot to be 30-90 ℃, and preserving the heat for 5-24 hours at the temperature;
(3) and (3) replacement: and after the impregnation is finished, pumping the softened bamboo chips into a dewatering screw, and adding a proper amount of spray water to replace residual alkali in the bamboo chips.
(4) Extruding: and (4) conveying the bamboo chips dehydrated in the step (3) into extrusion equipment by virtue of a screw to carry out extrusion and tearing to obtain unbleached brown pulp, wherein the concentration of the pulp after extrusion is 30-50%.
(5) And (3) secondary replacement: and (3) adjusting the concentration of the extruded coarse pulp to 10-20% by adding clear water through a dilution screw, and then sending the coarse pulp into pulp extrusion equipment to be extruded to the concentration of 25-35%, and further replacing residual alkali in the pulp.
(6) High-concentration grinding: and (4) directly conveying the slurry obtained in the step (5) into a high-concentration pulping machine through a screw to form pulp again to obtain the finished unbleached pulp, wherein the content of the fiber bundles is not more than 5%.
The method for preparing the high-yield natural-color bamboo pulp by low-temperature displacement impregnation is characterized in that the impregnation alkali in the step (2) contains any one or a combination of two or more of sodium hydroxide, potassium hydroxide and calcium oxide.
The method for preparing the high-yield natural-color bamboo pulp by displacement impregnation is characterized in that the yield of the finished pulp in the step (6) is 80-95%, the kappa number is 80 or more, the whiteness is 10-30% ISO, and the b value is 25-40.
Compared with the prior high-yield bamboo pulp preparation technology, the invention has the advantages that:
1. the low-temperature impregnation mode is adopted, the energy-saving effect is obvious, and the impregnation uniformity is good.
2. The method has good matching performance with the prior alkali recovery system, and the generated black liquor has high treatment maturity, can be completely recycled, and is beneficial to large-scale production.
3. The bamboo chips are softened chemically, extruded and ground at high concentration to obtain the pulp with high uniformity and low energy consumption.
4. The black liquor is replaced by adding water to dilute and pulp, so that the defects of wide occupied area, large water consumption and more accessory equipment in replacement of the vacuum pulp washer are overcome.
5. Water consumption is saved, and water consumption per ton of pulp is 5m3And a water treatment system does not need to be newly built, so that the investment is saved.
6. High yield (basically over 85%), and low cost.
Detailed Description
The invention will now be described in further detail:
the present invention provides a method for preparing high-yield natural color bamboo pulp by replacement impregnation, which is implemented in the following manner but is not limited to the illustrated examples.
Example 1:
(1) preparing materials: cutting bamboo into rectangular bamboo pieces with length of 20-50 mm and width of 10-20 mm, and washing with water;
(2) low-temperature impregnation: naturally filling the bamboo chips into a pot, adding warm water with the temperature of about 60 ℃ in a liquid control ratio of 2.5: 1, simultaneously adding sodium hydroxide, wherein the amount of the sodium hydroxide is 4% of that of the absolutely dry bamboo chips, adding low-pressure steam to control the temperature in the pot to be 90 ℃, and preserving the heat for 6 hours at the temperature;
(3) and (3) replacement: and after the impregnation is finished, pumping the softened bamboo chips into a dewatering screw, and adding a proper amount of spray water to replace residual alkali in the bamboo chips.
(4) Extruding: and (4) conveying the bamboo chips dehydrated in the step (3) into extrusion equipment by virtue of a screw to carry out extrusion and tearing to obtain unbleached brown stock, wherein the concentration of the pulp after extrusion is 40%.
(5) And (3) secondary replacement: and (3) adjusting the concentration of the extruded coarse pulp to 15% by a dilution screw and adding clear water, then sending the coarse pulp into pulp extrusion equipment to be extruded to 30% in concentration, and further replacing residual alkali in the pulp.
(6) High-concentration grinding: directly conveying the pulp obtained in the step (5) into a high-concentration pulp mill through a screw to form pulp again to obtain finished unbleached pulp, wherein the content of fiber bundles is not more than 4%; the yield was 91%, kappa number 150, whiteness 15% ISO, b value 25.
Example 2:
(1) preparing materials: cutting bamboo into rectangular bamboo pieces with length of 20-50 mm and width of 10-20 mm, and washing with water;
(2) low-temperature impregnation: naturally filling the bamboo chips into a pot, adding warm water at about 60 ℃ in a liquid control ratio of 3: 1, simultaneously adding sodium hydroxide, wherein the amount of the sodium hydroxide is 6% of that of the absolutely dry bamboo chips, adding low-pressure steam to control the temperature in the pot to be 70 ℃, and preserving the heat for 12 hours at the temperature;
(3) and (3) replacement: and after the impregnation is finished, pumping the softened bamboo chips into a dewatering screw, and adding a proper amount of spray water to replace residual alkali in the bamboo chips.
(4) Extruding: and (4) conveying the bamboo chips dehydrated in the step (3) into extrusion equipment by virtue of a screw to carry out extrusion and tearing to obtain unbleached brown pulp, wherein the concentration of the pulp after extrusion is 35%.
(5) And (3) secondary replacement: the extruded coarse pulp is diluted by a dilution screw, clear water is added to adjust the concentration to 12%, and then the coarse pulp is sent into pulp extrusion equipment to be extruded to the concentration of 32%, so that residual alkali in the pulp is further replaced.
(6) High-concentration grinding: directly conveying the pulp obtained in the step (5) into a high-concentration pulp mill through a screw to form pulp again to obtain finished unbleached pulp, wherein the content of fiber bundles is not more than 4%; the yield was 89%, kappa number 140, whiteness 17% ISO, b value 30.
Example 3:
(1) preparing materials: cutting bamboo into rectangular bamboo pieces with length of 20-50 mm and width of 10-20 mm, and washing with water;
(2) low-temperature impregnation: naturally filling the bamboo chips into a pot, adding warm water at about 60 ℃ in a liquid control ratio of 4: 1, simultaneously adding sodium hydroxide, wherein the amount of the sodium hydroxide is 10% of that of the absolutely dry bamboo chips, adding low-pressure steam to control the temperature in the pot to be 55 ℃, and preserving the heat for 14 hours at the temperature;
(3) and (3) replacement: and after the impregnation is finished, pumping the softened bamboo chips into a dewatering screw, and adding a proper amount of spray water to replace residual alkali in the bamboo chips.
(4) Extruding: and (4) conveying the bamboo chips dehydrated in the step (3) into extrusion equipment by virtue of a screw to carry out extrusion and tearing to obtain unbleached brown stock, wherein the concentration of the pulp after extrusion is 40%.
(5) And (3) secondary replacement: and (3) adjusting the concentration of the extruded coarse pulp to 10% by a dilution screw and adding clear water, then sending the coarse pulp into pulp extrusion equipment to be extruded to 28% in concentration, and further replacing residual alkali in the pulp.
(6) High-concentration grinding: directly conveying the pulp obtained in the step (5) into a high-concentration pulp mill through a screw to form pulp again to obtain finished unbleached pulp, wherein the content of fiber bundles is not more than 3%; the yield was 85%, kappa number 130, whiteness 22% ISO, b value 35.
Example 4:
(1) preparing materials: cutting bamboo into rectangular bamboo pieces with length of 20-50 mm and width of 10-20 mm, and washing with water;
(2) low-temperature impregnation: naturally filling the bamboo chips into a pot, adding hot water at about 60 ℃ in a control liquid ratio of 3: 1, simultaneously adding potassium hydroxide, wherein the dosage of the potassium hydroxide is 9 percent of that of the absolutely dry bamboo chips, adding low-pressure steam to control the temperature in the pot to be 60 ℃, and preserving the heat for 14 hours at the temperature;
(3) and (3) replacement: and after the impregnation is finished, pumping the softened bamboo chips into a dewatering screw, and adding a proper amount of spray water to replace residual alkali in the bamboo chips.
(4) Extruding: and (4) conveying the bamboo chips dehydrated in the step (3) into extrusion equipment by virtue of a screw to carry out extrusion and tearing to obtain unbleached brown stock, wherein the concentration of the pulp after extrusion is 40%.
(5) And (3) secondary replacement: and (3) adjusting the concentration of the extruded coarse pulp to 10% by a dilution screw and adding clear water, then sending the coarse pulp into pulp extrusion equipment to be extruded to 28% in concentration, and further replacing residual alkali in the pulp.
(6) High-concentration grinding: directly conveying the pulp obtained in the step (5) into a high-concentration pulp mill through a screw to form pulp again to obtain finished unbleached pulp, wherein the content of fiber bundles is not more than 7%; the yield was 86%, kappa number 135, whiteness 20% ISO, b value 33.
Example 5:
(1) preparing materials: cutting bamboo into rectangular bamboo pieces with length of 20-50 mm and width of 10-20 mm, and washing with water;
(2) low-temperature impregnation: naturally filling the bamboo chips into a pot, adding warm water at about 60 ℃ in a liquid control ratio of 3: 1, simultaneously adding calcium oxide, wherein the amount of calcium oxide is 10% of that of the absolutely dry bamboo chips, adding low-pressure steam to control the temperature in the pot to be 80 ℃, and preserving the heat for 24 hours at the temperature;
(3) and (3) replacement: and after the impregnation is finished, pumping the softened bamboo chips into a dewatering screw, and adding a proper amount of spray water to replace residual alkali in the bamboo chips.
(4) Extruding: and (4) conveying the bamboo chips dehydrated in the step (3) into extrusion equipment by virtue of a screw to carry out extrusion and tearing to obtain unbleached brown pulp, wherein the concentration of the pulp after extrusion is 38%.
(5) And (3) secondary replacement: and (3) adjusting the concentration of the extruded coarse pulp to 15% by a dilution screw and adding clear water, then sending the coarse pulp into pulp extrusion equipment to be extruded to 35% in concentration, and further replacing residual alkali in the pulp.
(6) High-concentration grinding: directly conveying the pulp obtained in the step (5) into a high-concentration pulp mill through a screw to form pulp again to obtain finished unbleached pulp, wherein the content of fiber bundles is not more than 5%; the yield was 93%, kappa number 155, whiteness 11% ISO, b value 26.
Example 6:
(1) preparing materials: cutting bamboo into rectangular bamboo pieces with length of 20-50 mm and width of 10-20 mm, and washing with water;
(2) low-temperature impregnation: naturally filling the bamboo chips into a pot, adding hot water at about 60 ℃ in a control liquid ratio of 3: 1, simultaneously adding sodium hydroxide and calcium oxide, wherein the amount of the sodium hydroxide is 7% of that of the oven-dried bamboo chips, the amount of the calcium oxide is 1% of that of the oven-dried bamboo chips, adding low-pressure steam to control the temperature in the pot to be 80 ℃, and preserving the heat for 16 hours at the temperature;
(3) and (3) replacement: and after the impregnation is finished, pumping the softened bamboo chips into a dewatering screw, and adding a proper amount of spray water to replace residual alkali in the bamboo chips.
(4) Extruding: and (4) conveying the bamboo chips dehydrated in the step (3) into extrusion equipment by virtue of a screw to carry out extrusion and tearing to obtain unbleached brown pulp, wherein the concentration of the pulp after extrusion is 38%.
(5) And (3) secondary replacement: and (3) adjusting the concentration of the extruded coarse pulp to 12% by a dilution screw and adding clear water, then sending the coarse pulp into pulp extrusion equipment to be extruded to 35% in concentration, and further replacing residual alkali in the pulp.
(6) High-concentration grinding: directly conveying the pulp obtained in the step (5) into a high-concentration pulp mill through a screw to form pulp again to obtain finished unbleached pulp, wherein the content of fiber bundles is not more than 4%; the yield was 88%, kappa number 145, whiteness 18% ISO, b value 30.
Example 7:
(1) preparing materials: cutting bamboo into rectangular bamboo pieces with length of 20-50 mm and width of 10-20 mm, and washing with water;
(2) low-temperature impregnation: naturally filling the bamboo chips into a pot, adding hot water with the temperature of about 60 ℃ in a liquid control ratio of 2.5: 1, simultaneously adding sodium hydroxide, wherein the using amount of the sodium hydroxide is 7 percent of that of the absolutely dry bamboo chips, controlling the temperature at 45 ℃, and preserving the heat for 24 hours at the temperature;
(3) and (3) replacement: and after the impregnation is finished, pumping the softened bamboo chips into a dewatering screw, and adding a proper amount of spray water to replace residual alkali in the bamboo chips.
(4) Extruding: and (4) conveying the bamboo chips dehydrated in the step (3) into extrusion equipment by virtue of a screw to carry out extrusion and tearing to obtain unbleached brown stock, wherein the concentration of the pulp after extrusion is 40%.
(5) And (3) secondary replacement: and (3) adjusting the concentration of the extruded coarse pulp to 15% by a dilution screw and adding clear water, then sending the coarse pulp into pulp extrusion equipment to be extruded to 30% in concentration, and further replacing residual alkali in the pulp.
(6) High-concentration grinding: directly conveying the pulp obtained in the step (5) into a high-concentration pulp mill through a screw to form pulp again to obtain finished unbleached pulp, wherein the content of fiber bundles is not more than 5%; the yield was 92%, kappa number 160, whiteness 14% ISO, b value 37.
Claims (1)
1. A method for preparing high-yield natural-color bamboo pulp by low-temperature displacement impregnation comprises the following steps: preparing materials, dipping at low temperature, replacing, extruding, replacing for the second time, and grinding at high concentration; the method is characterized in that:
(1) preparing materials: cutting bamboo into rectangular bamboo pieces with length of 20-50 mm and width of 10-20 mm, and washing with water;
(2) low-temperature impregnation: naturally filling the bamboo chips into a pot, adding hot water with the temperature of about 60 ℃ to control the liquid ratio to be 2-4: 1, simultaneously adding impregnation alkali, wherein the alkali dosage is 4-10% of that of the absolutely dry bamboo chips, adding low-pressure steam to control the temperature in the pot to be 30-90 ℃, and preserving the heat for 5-24 hours at the temperature; the impregnation alkali in the step (2) contains one or more of sodium hydroxide, potassium hydroxide and calcium oxide;
(3) and (3) replacement: after the impregnation is finished, pumping the softened bamboo chips into a dewatering screw, and adding a proper amount of spray water to replace residual alkali in the bamboo chips;
(4) extruding: conveying the bamboo chips dehydrated in the step (3) into extrusion equipment by screw to carry out extrusion and tearing to obtain unbleached brown pulp, wherein the concentration of the pulp after extrusion is 30-50%;
(5) and (3) secondary replacement: adding clear water into the extruded coarse pulp through a dilution screw to adjust the concentration to 10-20%, then sending the coarse pulp into pulp extrusion equipment to be extruded until the concentration is 25-35%, and further replacing residual alkali in the pulp;
(6) high-concentration grinding: directly conveying the pulp obtained in the step (5) into a high-concentration pulp mill through a screw to form pulp again to obtain finished unbleached pulp, wherein the content of fiber bundles is not more than 5%; the yield of the finished pulp in the step (6) is 80-95%, the kappa number is 80 or more, the whiteness is 10-30% ISO, and the b value is 25-40.
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| CN111074661A (en) * | 2020-01-06 | 2020-04-28 | 四川工商职业技术学院 | Production method of high-yield bamboo pulp |
| CN113529472B (en) * | 2020-04-16 | 2023-04-14 | 北京英力生科新材料技术有限公司 | Bright yellow antibacterial natural-color bamboo paper pulp and paper product thereof |
| CN116623457B (en) * | 2023-05-26 | 2024-04-02 | 天津科技大学 | Natural color bamboo fiber fluff pulp board and preparation method thereof |
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| US4699691A (en) * | 1980-11-24 | 1987-10-13 | W. R. Grace & Co. | Thermomechanical digestion process |
| CN1974922B (en) * | 2006-12-19 | 2010-10-13 | 河北吉藁化纤有限责任公司 | Method for producing chemical fiber pomace with fiber as raw material |
| CN101638859B (en) * | 2009-08-17 | 2011-09-07 | 中国林业科学研究院林产化学工业研究所 | High-whiteness bleaching method for high-yield bamboo wood pulp |
| CN102337686A (en) * | 2010-07-20 | 2012-02-01 | 中国制浆造纸研究院 | Clean pulping technology of bamboo materials |
| CN102182086B (en) * | 2011-03-25 | 2013-04-24 | 四川永丰纸业股份有限公司 | Method for preparing bamboo pulp by full-liquid-phase prehydrolysis sulfate displacement cooking process |
| CN102321990A (en) * | 2011-09-16 | 2012-01-18 | 四川永丰纸业股份有限公司 | Method for preparing bamboo pulp with full liquid phase pre-hydrolytic sulfate rapid displacement cooking |
| CN104131483B (en) * | 2014-06-06 | 2018-09-28 | 四川环龙新材料有限公司 | A kind of high yield pulp1 high-performance bamboo fiber material and preparation method thereof prepared as raw material using bamboo |
| CN105672013A (en) * | 2016-02-17 | 2016-06-15 | 四川永丰纸业股份有限公司 | Natural color bamboo pulp production method and natural color paper for daily use produced through same |
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