CN115110328A - Non-wood paper pulp micro-nano bubble bleaching device and method - Google Patents
Non-wood paper pulp micro-nano bubble bleaching device and method Download PDFInfo
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- CN115110328A CN115110328A CN202210791755.2A CN202210791755A CN115110328A CN 115110328 A CN115110328 A CN 115110328A CN 202210791755 A CN202210791755 A CN 202210791755A CN 115110328 A CN115110328 A CN 115110328A
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- 238000004061 bleaching Methods 0.000 title claims abstract description 62
- 239000002101 nanobubble Substances 0.000 title claims abstract description 53
- 238000000034 method Methods 0.000 title claims abstract description 29
- 229920001131 Pulp (paper) Polymers 0.000 title claims abstract description 24
- 239000002023 wood Substances 0.000 title claims abstract description 22
- 239000002994 raw material Substances 0.000 claims abstract description 71
- 238000010411 cooking Methods 0.000 claims abstract description 55
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 29
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 28
- 239000001301 oxygen Substances 0.000 claims abstract description 28
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 28
- 239000003513 alkali Substances 0.000 claims abstract description 21
- 239000002002 slurry Substances 0.000 claims abstract description 9
- 238000004140 cleaning Methods 0.000 claims abstract description 5
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- 238000012216 screening Methods 0.000 claims abstract description 4
- 239000000243 solution Substances 0.000 claims description 33
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 30
- 239000000835 fiber Substances 0.000 claims description 10
- 239000010902 straw Substances 0.000 claims description 8
- 229920000742 Cotton Polymers 0.000 claims description 6
- 229920002522 Wood fibre Polymers 0.000 claims description 6
- 239000002025 wood fiber Substances 0.000 claims description 6
- 241000609240 Ambelania acida Species 0.000 claims description 5
- 239000010905 bagasse Substances 0.000 claims description 5
- 239000007789 gas Substances 0.000 claims description 5
- 235000017166 Bambusa arundinacea Nutrition 0.000 claims description 4
- 235000017491 Bambusa tulda Nutrition 0.000 claims description 4
- 244000302661 Phyllostachys pubescens Species 0.000 claims description 4
- 235000003570 Phyllostachys pubescens Nutrition 0.000 claims description 4
- 244000082204 Phyllostachys viridis Species 0.000 claims description 4
- 235000015334 Phyllostachys viridis Nutrition 0.000 claims description 4
- 235000021307 Triticum Nutrition 0.000 claims description 4
- 239000011425 bamboo Substances 0.000 claims description 4
- 240000008042 Zea mays Species 0.000 claims description 3
- 235000005824 Zea mays ssp. parviglumis Nutrition 0.000 claims description 3
- 235000002017 Zea mays subsp mays Nutrition 0.000 claims description 3
- 239000012670 alkaline solution Substances 0.000 claims description 3
- 235000005822 corn Nutrition 0.000 claims description 3
- 238000011084 recovery Methods 0.000 claims description 3
- 244000198134 Agave sisalana Species 0.000 claims description 2
- 235000011624 Agave sisalana Nutrition 0.000 claims description 2
- 235000005731 Bambusa membranacea Nutrition 0.000 claims description 2
- 240000006248 Broussonetia kazinoki Species 0.000 claims description 2
- 244000025254 Cannabis sativa Species 0.000 claims description 2
- 235000012766 Cannabis sativa ssp. sativa var. sativa Nutrition 0.000 claims description 2
- 235000012765 Cannabis sativa ssp. sativa var. spontanea Nutrition 0.000 claims description 2
- 240000000491 Corchorus aestuans Species 0.000 claims description 2
- 235000011777 Corchorus aestuans Nutrition 0.000 claims description 2
- 235000010862 Corchorus capsularis Nutrition 0.000 claims description 2
- 241000196324 Embryophyta Species 0.000 claims description 2
- 241001349804 Juncus alpinoarticulatus Species 0.000 claims description 2
- 235000004431 Linum usitatissimum Nutrition 0.000 claims description 2
- 240000006240 Linum usitatissimum Species 0.000 claims description 2
- 240000000249 Morus alba Species 0.000 claims description 2
- 235000008708 Morus alba Nutrition 0.000 claims description 2
- 235000014676 Phragmites communis Nutrition 0.000 claims description 2
- 240000000513 Santalum album Species 0.000 claims description 2
- 235000008632 Santalum album Nutrition 0.000 claims description 2
- 240000006394 Sorghum bicolor Species 0.000 claims description 2
- 235000011684 Sorghum saccharatum Nutrition 0.000 claims description 2
- 235000009120 camo Nutrition 0.000 claims description 2
- 235000005607 chanvre indien Nutrition 0.000 claims description 2
- 239000011487 hemp Substances 0.000 claims description 2
- 238000007781 pre-processing Methods 0.000 claims description 2
- 244000098338 Triticum aestivum Species 0.000 claims 1
- 230000005587 bubbling Effects 0.000 claims 1
- 239000003153 chemical reaction reagent Substances 0.000 abstract description 4
- 230000001590 oxidative effect Effects 0.000 abstract description 4
- 230000007613 environmental effect Effects 0.000 abstract 1
- 229920005610 lignin Polymers 0.000 description 33
- 229920002678 cellulose Polymers 0.000 description 17
- 239000001913 cellulose Substances 0.000 description 17
- 239000008367 deionised water Substances 0.000 description 14
- 229910021641 deionized water Inorganic materials 0.000 description 14
- 230000007935 neutral effect Effects 0.000 description 13
- 238000005406 washing Methods 0.000 description 7
- 238000000967 suction filtration Methods 0.000 description 6
- 238000004537 pulping Methods 0.000 description 5
- OSVXSBDYLRYLIG-UHFFFAOYSA-N dioxidochlorine(.) Chemical compound O=Cl=O OSVXSBDYLRYLIG-UHFFFAOYSA-N 0.000 description 4
- 239000004744 fabric Substances 0.000 description 4
- SUKJFIGYRHOWBL-UHFFFAOYSA-N sodium hypochlorite Chemical compound [Na+].Cl[O-] SUKJFIGYRHOWBL-UHFFFAOYSA-N 0.000 description 4
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 3
- 241000209140 Triticum Species 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 3
- 239000000460 chlorine Substances 0.000 description 3
- 229910052801 chlorine Inorganic materials 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 239000004155 Chlorine dioxide Substances 0.000 description 2
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 description 2
- PYKYMHQGRFAEBM-UHFFFAOYSA-N anthraquinone Natural products CCC(=O)c1c(O)c2C(=O)C3C(C=CC=C3O)C(=O)c2cc1CC(=O)OC PYKYMHQGRFAEBM-UHFFFAOYSA-N 0.000 description 2
- 150000004056 anthraquinones Chemical class 0.000 description 2
- 239000007844 bleaching agent Substances 0.000 description 2
- 235000019398 chlorine dioxide Nutrition 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 150000004820 halides Chemical class 0.000 description 2
- 239000011734 sodium Substances 0.000 description 2
- 238000003756 stirring Methods 0.000 description 2
- 229920002488 Hemicellulose Polymers 0.000 description 1
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 description 1
- 239000005708 Sodium hypochlorite Substances 0.000 description 1
- OUUQCZGPVNCOIJ-UHFFFAOYSA-M Superoxide Chemical compound [O-][O] OUUQCZGPVNCOIJ-UHFFFAOYSA-M 0.000 description 1
- 230000002378 acidificating effect Effects 0.000 description 1
- 239000003518 caustics Substances 0.000 description 1
- 239000013043 chemical agent Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
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- 238000004519 manufacturing process Methods 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000004076 pulp bleaching Methods 0.000 description 1
- UKLNMMHNWFDKNT-UHFFFAOYSA-M sodium chlorite Chemical compound [Na+].[O-]Cl=O UKLNMMHNWFDKNT-UHFFFAOYSA-M 0.000 description 1
- 229960002218 sodium chlorite Drugs 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
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- 231100000331 toxic Toxicity 0.000 description 1
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Images
Classifications
-
- 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
- D21C9/001—Modification of pulp properties
- D21C9/007—Modification of pulp properties by mechanical or physical means
-
- 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
- D21C9/1005—Pretreatment of the pulp, e.g. degassing 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
The invention discloses a non-wood paper pulp micro-nano bubble bleaching device and method, and belongs to the field of environmental protection. The method comprises the steps of crushing and screening non-wood raw materials, then putting the raw materials into clean water for cleaning, and removing dust and silt on the raw materials to obtain pretreated raw materials; then putting the raw materials into a cooking pot, adding an alkali solution for cooking to obtain a slurry; and finally, conveying the slurry to an area surrounded by the first layer of gauze of the reaction kettle, and carrying out contact reaction with oxygen-containing micro-nano bubbles output by the upper micro-nano bubble machine, thereby completing the bleaching process. According to the technical scheme, only oxygen is needed for bleaching the micro-nano bubbles, the use of a chemical reagent with strong oxidizing property is avoided, the oxygen which is not fully used can be recovered so as to be recycled subsequently, and the whole process is green, safe and efficient.
Description
Technical Field
The invention relates to a micro-nano bubble bleaching method for non-wood paper pulp, and belongs to the technical field of paper pulp bleaching.
Background
At present, the traditional chlorine-containing bleaching technology has the advantages of simple preparation process, low price and obvious bleaching effect, and is always the main bleaching mode of paper pulp production enterprises. However, chlorine-containing bleaching processes all use strongly oxidizing chemical agents such as sodium hypochlorite (NaClO), sodium chlorite (NaClO) 2 ). Chlorine dioxide (ClO) is released in large amounts as a toxic and corrosive substance during bleaching 2 ) The pollutants such as absorbable organic halide (AOX) and the like are difficult to degrade, and the environmental pollution is serious. The bleaching effluent accounts for 8-9% of the total papermaking effluent, but the Chemical Oxygen Demand (COD) accounts for 40% of the total effluent. Other procedures of bleaching without chlorine element such as hydrogen peroxide and ozone have the disadvantages of high bleaching cost, difficult storage, high safety use requirement and the like.
Disclosure of Invention
The invention aims to provide a non-wood pulp micro-nano bubble bleaching method, which takes non-wood pulp subjected to pretreatment of cooking (low-alkali concentration cooking) with an alkali amount (less than 15 wt.%) lower than that of the conventional method as a raw material, and realizes the bleaching of the non-wood pulp through micro-nano bubble treatment.
According to the method, non-wood raw materials are subjected to processes of crushing, screening, cleaning, low-alkali and high-concentration cooking pretreatment, wall breaking and micro-nano bubble bleaching. Compared with the traditional bleaching method, the oxygen is used for replacing the traditional bleaching reagent, the use of a strong oxidizing reagent is avoided, the whole process is green, safe and efficient, and the oxygen which is not fully used can be recovered so as to be recycled subsequently.
Unless otherwise indicated, all percentages used in the present invention are percentages by dry weight of the non-wood raw material.
The utility model provides a little nano-bubble bleaching device of non-timber paper pulp, the device includes reation kettle, reation kettle in by interior gauze and the second time gauze of being equipped with in proper order outside to, the output of little nano-bubble machine and the upper portion that first layer gauze was regional link to each other, just reation kettle's upper portion be equipped with pressure sensor and gas collection mouth, gas collection mouth and oxygen recovery bottle link to each other, the aperture of first layer gauze be 400 ~ 500 meshes, the aperture of second time gauze is 700 ~ 900 meshes.
A method for realizing non-wood paper pulp micro-nano bubble bleaching by utilizing the device comprises the following steps:
preprocessing: after crushing and screening the non-wood raw materials, putting the non-wood raw materials into clean water for cleaning, and removing dust and silt on the raw materials to obtain pretreated raw materials;
② stewing: putting the pretreated raw materials in the step I into a cooking pot, and adding an alkali solution to cook to obtain a slurry;
③ bleaching: and (4) conveying the pulp obtained in the step two to an area surrounded by the first layer of gauze of the reaction kettle, and carrying out contact reaction with micro-nano bubbles containing oxygen output by the upper micro-nano bubble machine, so that the pulp obtained by collection in the reaction kettle is bleached pulp.
In the technical scheme of the invention, the non-wood refers to non-wood fiber raw materials and is one or more of all plant fiber raw materials except wood; preferably: the non-wood fiber raw material is any one of bamboo, seedling, bast fiber, leaf fiber and seed hair;
further preferably: the non-wood fiber raw material is any one of moso bamboo, arrowhead bamboo, white bamboo, phyllostachys pubescens, straw, wheat straw, reed, bagasse, sorghum stalk, corn stalk, cotton stalk, hemp, flax, jute, mulberry bark, paper mulberry bark, sandalwood bark, Chinese alpine rush, sisal hemp and the like, cotton and cotton linter.
In the technical scheme of the invention, the paper pulp refers to the pulp prepared by cooking non-wood raw materials by using an alkali solution, wherein the alkali solution is NaOH solution and Na 2 CO 3 Solution, KOH solution, K 2 CO 3 And (3) solution.
In the technical scheme of the invention, the mass fraction of the alkali solution in the step (II) is 2-12 wt.%; the added alkali solution accounts for 6 to 10 percent of the raw material.
In the technical scheme of the invention, the diameter of the oxygen-containing micro-nano bubbles is 10nm-1 μm. Preferably: and step three, the diameter of the oxygen-containing micro-nano bubbles is 50-200 nm.
In the technical scheme of the invention, the cooking conditions in the step II are as follows: the cooking temperature is 100-120 ℃, and the cooking time is 30-240 min.
In the technical scheme of the invention, the oxygen flow entering the micro-nano bubble machine in the step III is 20-40mml/min, and the bleaching time is 60-240 min. Preferably: the bleaching time is 120-240 min.
According to the technical scheme, the method for measuring the lignin content is the NREL-lignocellulose content measuring standard of the United states department of energy.
In some specific technical schemes, the non-wood pulp micro-nano bubble bleaching method comprises the following steps:
(1) the non-wood raw materials are crushed and screened, and then are put into clean water for cleaning to remove substances such as dust, silt and the like on the raw materials.
(2) Placing the raw materials from step (1) into a digester, and adding alkaline solution (NaOH, Na) 2 CO 3 、 KOH、K 2 CO 3 And (4) alkali solution treatment), uniformly mixing, and then cooking the slurry. And after the cooking is finished, extracting black liquor from the slurry, recovering the black liquor for later use, washing the slurry to be neutral by using deionized water, and squeezing water to dry after wall breaking to bleach the micro-nano bubbles.
Cooking to pulp result: the fine pulp yield is 52.26-62.71% (wt/wt raw material absolute dry), and the lignin content is 9.28-15.91% (wt/wt raw material absolute dry).
(3) And (3) performing wall breaking treatment on the slurry from the step (2), wherein the subsequent operation steps are shown in the figure, the slurry after wall breaking is placed into a cloth bag with 450 meshes, the cloth bag is placed into a reaction kettle and is connected with a water outlet of a micro-nano bubble generator, and stirring is simultaneously carried out. Adjust rotameter (micro-nano bubble generator is from taking), the oxygen flow that the control got into the machine, oxygen dissolves in water and releases and form micro-nano bubble, and the rivers of the micro-nano bubble that contain are shot to the fibre surface from the shower nozzle with high-speed, and the bleaching of realization paper pulp is got rid of remaining lignin. The water flow emitted by the spray head can sequentially flow into the reaction kettle through the cloth bags with 450 meshes and the cloth bags with 800 meshes and then circularly enters the micro-nano bubble generator through the water inlet. If the water level in the reaction kettle exceeds the position of the water outlet, the water can automatically flow out of the reaction kettle through the water outlet. When the pressure sensor detects that the content of the unreacted oxygen in the reaction kettle exceeds 1MPa, the unreacted oxygen can return to the oxygen recovery bottle through the air collecting port for later use. After bleaching, the pulp is washed to neutrality by deionized water.
Results after bleaching: bleached pulp yield 69.61% -93.93% (wt/wt pulp) and lignin content 9.74% -13.74% (wt/wt pulp).
The alkali solution in the step (2) is fully mixed with the raw material, hemicellulose and lignin can be partially removed and cellulose can be effectively swelled in the cooking process, and a gap is provided for superoxide radicals generated by micro-nano bubbles to enter the interior of non-wood tissues in the later period and a channel is provided for dissolution of lignin.
Compared with the prior art, the invention has the beneficial effects that:
(1) the non-wood tissue structure is loose, and is beneficial to being contacted with micro-nano bubbles, and the generated superoxide radical is beneficial to removing lignin.
(2) In the prior art, a low alkali solution with the concentration of less than or equal to 12 wt.% is required, the cooking time is 30-240min, and the method is obviously superior to the conventional cooking operation condition (more than or equal to 15 wt.% of concentrated alkali solution, and the cooking time is 240-480min), thereby reducing the use of chemicals and improving the pulping efficiency.
(3) Micro-nano bubble bleaching only needs oxygen, has avoided strong oxidizing property chemical reagent's use to the oxygen that fails the make full use of can be retrieved so that follow-up circulation uses, whole process green safety and high efficiency.
(4) The maximum tensile strength of the fiber bleached by the micro-nano bubbles can reach 29.806MPa, and is increased by 50% compared with the untreated fiber, the maximum Young modulus is 223.53MPa, and the maximum elongation at break is 10.15%.
The invention discloses a method for bleaching non-wood pulp fibers by micro-nano bubbles according to claim 1, which comprises the following process steps: after the non-wood raw materials are subjected to low-alkali and low-concentration (less than or equal to 12 wt.%) low-temperature cooking (the cooking temperature is 100 ℃ and 120 ℃, and the cooking time is 30-240min), the fine pulp yield is 52.26-62.71% (wt/wt raw materials are absolutely dry), and the lignin content is 9.28-15.91% (wt/wt raw materials are absolutely dry). The obtained pulp cellulose uses micro-nano bubbles to bleach pulp under the conditions of 25 ℃ and 20-40ml/min of oxygen flow, the yield of bleached pulp is 69.61-93.93% (wt/wt pulp), and the lignin content is 9.74-13.74% (wt/wt pulp).
Drawings
FIG. 1 is a diagram of a nanometer microbubble bleaching device
Wherein: 1 is the air inlet, 2 is the water inlet, 3 is reation kettle, 4 is second layer gauze, 5 is second c layer gauze, 6 is the delivery port, 7 is the shower nozzle, 8 is pressure sensor, 9 is the gas collection mouth, 10 is the delivery port, 11 is the stirring.
Detailed Description
The present invention will be further understood from the specific examples given below. They are not intended to limit the invention.
Example 1
Putting the crushed, screened and cleaned straw raw material into a cooking pot, adding 6 wt.% NaOH solution (aqueous alkali is 10% of the raw material), cooking at 110 ℃ for 60 min. After cooking is finished, black liquor is extracted from the pulp and recovered for later use, and the pulp is washed to be neutral by deionized water and wall-broken. And (3) bleaching the obtained pulp cellulose for 60min by using micro-nano bubbles with the diameter of 200nm at room temperature under the condition of oxygen flow of 20ml/min after wall breaking, washing the pulp to be neutral by using deionized water, and performing suction filtration to obtain the bleached pulp cellulose.
Cooking pulping result: the yield of the fine pulp is 54.80% (wt/wt raw material is absolutely dry), and the lignin content is 15.91% (wt/wt raw material is absolutely dry).
Results after bleaching: bleached pulp yield 85.11% (wt/wt pulp), lignin content 13.74% (wt/wt pulp).
Example 2
Putting the crushed, screened and cleaned wheat straw raw material into a cooking pot, adding 8 wt.% NaOH solution (8% of alkali solution) into the wheat straw raw material, cooking at 110 ℃ for 60 min. After cooking, black liquor is extracted from the pulp and recovered for later use, and the pulp is washed to be neutral by deionized water and subjected to wall breaking. And (3) bleaching the obtained pulp cellulose for 60min by using micro-nano bubbles with the diameter of 200nm at the temperature of 25 ℃ and the oxygen flow of 30ml/min after wall breaking, washing the pulp to be neutral by using deionized water, and performing suction filtration to obtain the bleached pulp cellulose.
Cooking to pulp result: the yield of the fine pulp is 52.26 percent (wt/wt raw material is absolutely dry), and the content of the lignin is 13.36 percent (wt/wt raw material is absolutely dry).
Results after bleaching: bleached pulp yield 84.49%/g (wt/wt pulp), lignin content 11.15% (wt/wt pulp).
Example 3
Putting the crushed, screened and cleaned bagasse raw material into a cooking pot, adding 10 wt.% of NaOH solution (aqueous alkali is 6% of the raw material), cooking at 110 ℃ for 60 min. After cooking, black liquor is extracted from the pulp and recovered for later use, and the pulp is washed to be neutral by deionized water and subjected to wall breaking. And (3) bleaching the obtained pulp cellulose for 60min by using micro-nano bubbles with the diameter of 100nm at the temperature of 25 ℃ and the oxygen flow rate of 30(20-40) ml/min after wall breaking, washing the pulp to be neutral by using deionized water after completion, and performing suction filtration to obtain the bleached pulp cellulose.
Cooking to pulp result: the yield of the fine pulp is 62.71 percent (wt/wt raw material is absolutely dry), and the content of the lignin is 11.00 percent (wt/wt raw material is absolutely dry).
Results after bleaching: bleached pulp yield 91.65% (wt/wt pulp) and lignin content 10.91% (wt/wt pulp).
Example 4
Putting the crushed, screened and cleaned corn straw raw material into a cooking pot, adding a NaOH solution (aqueous alkali is 6 percent of the raw material) with the mass fraction of 12 wt.%, and cooking at 110 ℃ for 60 min. After cooking, black liquor is extracted from the pulp and recovered for later use, and the pulp is washed to be neutral by deionized water and subjected to wall breaking. And (3) bleaching the obtained pulp cellulose for 60min by using micro-nano bubbles with the diameter of 50nm at the temperature of 25 ℃ and under the condition of oxygen flow of 40ml/min after wall breaking, washing the pulp to be neutral by using deionized water, and performing suction filtration to obtain the bleached pulp cellulose.
Cooking pulping result: the yield of the fine pulp is 61.88 percent (wt/wt raw material is absolutely dry), and the content of the lignin is 9.28 percent (wt/wt raw material is absolutely dry).
Results after bleaching: bleached pulp yield 82.11% (wt/wt pulp), lignin content 11.60% (wt/wt pulp).
Example 5
Example 1 was repeated with the following differences: the micro-nano bubble processing time is 120 min.
Cooking to pulp result: the yield of the fine pulp is 54.80% (wt/wt raw material is absolutely dry), and the content of the lignin is 15.91% (wt/wt raw material is absolutely dry).
Results after bleaching: bleached pulp yield 69.61% (wt/wt pulp) and lignin content 10.73% (wt/wt pulp).
Example 6
Example 2 was repeated with the following differences: the micro-nano bubble processing time is 120 min.
Cooking to pulp result: the yield of the fine pulp is 52.26 percent (wt/wt raw material is absolutely dry), and the content of the lignin is 13.36 percent (wt/wt raw material is absolutely dry).
Results after bleaching: bleached pulp yield 92.77% (wt/wt pulp), lignin content 10.88% (wt/wt pulp).
Example 7
Example 3 was repeated with the following differences: the micro-nano bubble processing time is 120 min.
Cooking to pulp result: the yield of the fine pulp is 62.71 percent (wt/wt raw material is absolutely dry), and the content of the lignin is 11.00 percent (wt/wt raw material is absolutely dry).
Results after bleaching: bleached pulp yield 86.69% (wt/wt pulp), lignin content 10.13% (wt/wt pulp).
Example 8
Example 4 was repeated with the following differences: the micro-nano bubble processing time is 120 min.
Cooking to pulp result: the yield of the fine pulp is 61.88 percent (wt/wt raw material is absolutely dry), and the content of the lignin is 9.28 percent (wt/wt raw material is absolutely dry).
Results after bleaching: bleached pulp yield 75.37% (wt/wt pulp), lignin content 9.91% (wt/wt pulp).
Example 9
Example 3 was repeated with the following differences: the micro-nano bubble processing time is 180 min.
Cooking to pulp result: the fine pulp yield was 62.71% (wt/wt feed oven dried) and the lignin content was 11.00% (wt/wt feed oven dried).
Results after bleaching: bleached pulp yield 93.01% (wt/wt pulp), lignin content 9.89% (wt/wt pulp).
Example 10
Example 3 was repeated with the following differences: the treatment time of the nano microbubbles is 240 min.
Cooking pulping result: the yield of the fine pulp is 62.71 percent (wt/wt raw material is absolutely dry), and the content of the lignin is 11.00 percent (wt/wt raw material is absolutely dry).
Results after bleaching: bleached pulp yield 93.93% (wt/wt pulp), lignin content 9.74% (wt/wt pulp).
Comparative example 1:
putting the crushed, screened and cleaned bagasse raw material into a cooking pot, adding 15 wt.% of NaOH solution and anthraquinone, cooking at 130 ℃ for 240 min. After cooking, black liquor is extracted from the pulp and recovered for later use, and the pulp is washed to be neutral by deionized water and subjected to wall breaking. Breaking the wall of the obtained pulp cellulose according to 20ml of H 2 O 2 Bleaching at a ratio of/g cellulose in H 2 O 2 Adding 15 wt.% NaOH solution into the solution to ensure that H is generated 2 O 2 The pH value of the solution is about 10.5, the solution is added into the cellulose suspension after the pH value is adjusted to react, the solution is vigorously shaken and is soaked in hot water at the temperature of 100 ℃ for 3-4 min. After bleaching, washing the pulp to be neutral by using deionized water, and performing suction filtration to obtain a round cake shapeTo bleached pulp cellulose.
Cooking to pulp result: the yield of the fine pulp is 46.91% (wt/wt raw material is absolutely dry), and the content of the lignin is 6.27% (wt/wt raw material is absolutely dry).
Results after bleaching: bleached pulp yield 94.49%/g (wt/wt pulp) and lignin content 2.88% (wt/wt pulp).
Comparative example 2:
putting the crushed, screened and cleaned bagasse raw material into a cooking pot, adding 15 wt.% of NaOH solution and anthraquinone, cooking at 130 ℃ for 240 min. After cooking, black liquor is extracted from the pulp and recovered for later use, and the pulp is washed to be neutral by deionized water and subjected to wall breaking. The obtained pulp cellulose is subjected to wall breaking according to 20ml of 8 wt.% NaClO 2 Bleaching at a ratio of/g cellulose for 2-3h, maintaining an acidic pH at 80-100 ℃. And after bleaching, washing the pulp to be neutral by using deionized water, and performing suction filtration to obtain a round cake shape to obtain the bleached paper pulp cellulose.
Cooking pulping result: the yield of the fine pulp is 46.91% (wt/wt raw material is absolutely dry), and the content of the lignin is 6.27% (wt/wt raw material is absolutely dry).
Results after bleaching: bleached pulp yield 93.56%/g (wt/wt pulp) and lignin content 3.28% (wt/wt pulp).
Claims (8)
1. The utility model provides a micro-nano bubble bleaching device of non-timber paper pulp, its characterized in that, the device include reation kettle, reation kettle in by interior first layer gauze and second floor gauze of being equipped with in proper order to outer, micro-nano bubbling machine's output and the upper portion that first layer gauze is the region link to each other, just reation kettle's upper portion be equipped with pressure sensor and gas collection mouth, gas collection spoken oxygen recovery bottle link to each other, the aperture of first layer gauze be 400 ~ 500 meshes, the aperture of second time gauze is 700 ~ 900 meshes.
2. A method for realizing non-wood pulp micro-nano bubble bleaching by using the device of claim 1, which is characterized by comprising the following steps:
preprocessing: after crushing and screening the non-wood raw materials, putting the non-wood raw materials into clean water for cleaning, and removing dust and silt on the raw materials to obtain pretreated raw materials;
② stewing: putting the pretreated raw materials in the step I into a cooking pot, and adding an alkali solution to cook to obtain a slurry;
③ bleaching: and (4) conveying the pulp obtained in the step two to an area surrounded by the first layer of gauze of the reaction kettle, and carrying out contact reaction with micro-nano bubbles containing oxygen output by the upper micro-nano bubble machine, so that the pulp obtained by collection in the reaction kettle is bleached pulp.
3. The non-wood pulp micro-nano bubble bleaching method according to claim 1, wherein the non-wood is a non-wood fiber raw material, and is one or more of all plant fiber raw materials except wood; preferably: the non-wood fiber raw material is any one of bamboo, seedling, bast fiber, leaf fiber and seed hair;
further preferably: the non-wood fiber raw material is any one of moso bamboo, arrowhead bamboo, white bamboo, phyllostachys pubescens, straw, wheat straw, reed, bagasse, sorghum stalk, corn stalk, cotton stalk, hemp, flax, jute, mulberry bark, paper mulberry bark, sandalwood bark, Chinese alpine rush, sisal hemp and the like, cotton and cotton linter.
4. The micro-nano bubble bleaching method for non-wood pulp according to claim 1, wherein the pulp is obtained by cooking non-wood raw materials into pulp with an alkaline solution, wherein the alkaline solution is NaOH solution or Na solution 2 CO 3 Solution, KOH solution, K 2 CO 3 And (3) solution.
5. The non-wood pulp micro-nano bubble bleaching method according to claim 3, characterized in that the mass fraction of the alkali solution in step (ii) is 2 wt.% to 12 wt.%; the added alkali solution accounts for 6 to 10 percent of the raw material.
6. The method for bleaching micro-nano bubbles of non-wood pulp according to claim 1, wherein the diameter of the micro-nano bubbles containing oxygen is 10nm to 1 μm; preferably: and step three, the diameter of the oxygen-containing micro-nano bubbles is 50-200 nm.
7. The micro-nano bubble bleaching method for non-wood pulp according to claim 1, wherein the cooking conditions of the step (II) are as follows: the cooking temperature is 100-120 ℃, and the cooking time is 30-240 min.
8. The non-wood pulp micro-nano bubble bleaching method according to claim 5, wherein the flow of oxygen entering the micro-nano bubble machine in the step (iii) is 20-40mml/min, and the bleaching time is 60-240 min; preferably: the bleaching time is 120-240 min.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101089291A (en) * | 2007-08-03 | 2007-12-19 | 山东泉林纸业有限责任公司 | Prepared bleach chemical pulp using grass kind plant as raw material and preparation method thereof |
| CN207142908U (en) * | 2017-08-30 | 2018-03-27 | 河北莫兰斯环境科技股份有限公司 | Pressurize pure oxygen aeration reaction unit |
| CN209276895U (en) * | 2018-10-26 | 2019-08-20 | 华南理工大学 | A kind of oxygen system high-efficiency cleaning bleached pulp test-type device |
| WO2021213740A1 (en) * | 2020-04-23 | 2021-10-28 | Messer Austria Gmbh | Process and apparatus for producing bleached cellulose |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101089291A (en) * | 2007-08-03 | 2007-12-19 | 山东泉林纸业有限责任公司 | Prepared bleach chemical pulp using grass kind plant as raw material and preparation method thereof |
| CN207142908U (en) * | 2017-08-30 | 2018-03-27 | 河北莫兰斯环境科技股份有限公司 | Pressurize pure oxygen aeration reaction unit |
| CN209276895U (en) * | 2018-10-26 | 2019-08-20 | 华南理工大学 | A kind of oxygen system high-efficiency cleaning bleached pulp test-type device |
| WO2021213740A1 (en) * | 2020-04-23 | 2021-10-28 | Messer Austria Gmbh | Process and apparatus for producing bleached cellulose |
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