CN110774397A - Production system and production method of bleached lignocellulose - Google Patents
Production system and production method of bleached lignocellulose Download PDFInfo
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- CN110774397A CN110774397A CN201911151713.7A CN201911151713A CN110774397A CN 110774397 A CN110774397 A CN 110774397A CN 201911151713 A CN201911151713 A CN 201911151713A CN 110774397 A CN110774397 A CN 110774397A
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- lignocellulose
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 77
- 238000004061 bleaching Methods 0.000 claims abstract description 37
- 239000000428 dust Substances 0.000 claims abstract description 31
- 239000002023 wood Substances 0.000 claims abstract description 24
- 239000007844 bleaching agent Substances 0.000 claims abstract description 23
- 239000000463 material Substances 0.000 claims abstract description 23
- 238000006243 chemical reaction Methods 0.000 claims abstract description 22
- 238000012856 packing Methods 0.000 claims abstract description 16
- 239000000843 powder Substances 0.000 claims abstract description 11
- 235000013312 flour Nutrition 0.000 claims abstract description 10
- 238000007599 discharging Methods 0.000 claims abstract description 8
- 238000012216 screening Methods 0.000 claims abstract description 8
- 239000002994 raw material Substances 0.000 claims description 50
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 claims description 24
- 239000007864 aqueous solution Substances 0.000 claims description 15
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 12
- 238000012545 processing Methods 0.000 claims description 12
- 239000006227 byproduct Substances 0.000 claims description 11
- 239000000047 product Substances 0.000 claims description 10
- 238000000227 grinding Methods 0.000 claims description 9
- 239000000243 solution Substances 0.000 claims description 9
- 238000005507 spraying Methods 0.000 claims description 9
- 239000012535 impurity Substances 0.000 claims description 8
- 238000003756 stirring Methods 0.000 claims description 7
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 claims description 6
- 208000032544 Cicatrix Diseases 0.000 claims description 3
- 241000219000 Populus Species 0.000 claims description 3
- 239000004115 Sodium Silicate Substances 0.000 claims description 3
- 239000011259 mixed solution Substances 0.000 claims description 3
- 231100000241 scar Toxicity 0.000 claims description 3
- 230000037387 scars Effects 0.000 claims description 3
- 229910000029 sodium carbonate Inorganic materials 0.000 claims description 3
- 235000019795 sodium metasilicate Nutrition 0.000 claims description 3
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims description 3
- 229910052911 sodium silicate Inorganic materials 0.000 claims description 3
- KVSYNOOPFSVLNF-UHFFFAOYSA-M sodium;4-nonanoyloxybenzenesulfonate Chemical compound [Na+].CCCCCCCCC(=O)OC1=CC=C(S([O-])(=O)=O)C=C1 KVSYNOOPFSVLNF-UHFFFAOYSA-M 0.000 claims description 3
- 238000010025 steaming Methods 0.000 claims description 3
- FRPJTGXMTIIFIT-UHFFFAOYSA-N tetraacetylethylenediamine Chemical compound CC(=O)C(N)(C(C)=O)C(N)(C(C)=O)C(C)=O FRPJTGXMTIIFIT-UHFFFAOYSA-N 0.000 claims description 3
- 239000012716 precipitator Substances 0.000 claims 1
- 238000010924 continuous production Methods 0.000 abstract description 5
- 230000007613 environmental effect Effects 0.000 abstract description 5
- 238000002360 preparation method Methods 0.000 abstract description 5
- 238000001035 drying Methods 0.000 description 21
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 13
- 229920005610 lignin Polymers 0.000 description 12
- 238000010438 heat treatment Methods 0.000 description 8
- 238000000034 method Methods 0.000 description 8
- 239000000126 substance Substances 0.000 description 8
- 230000002087 whitening effect Effects 0.000 description 6
- 238000003912 environmental pollution Methods 0.000 description 5
- 239000003795 chemical substances by application Substances 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 229920002488 Hemicellulose Polymers 0.000 description 3
- 230000009471 action Effects 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 3
- 238000013461 design Methods 0.000 description 3
- 239000012634 fragment Substances 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 235000011121 sodium hydroxide Nutrition 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 238000001599 direct drying Methods 0.000 description 2
- 239000002649 leather substitute Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 150000004965 peroxy acids Chemical class 0.000 description 2
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 238000007605 air drying Methods 0.000 description 1
- IRERQBUNZFJFGC-UHFFFAOYSA-L azure blue Chemical compound [Na+].[Na+].[Na+].[Na+].[Na+].[Na+].[Na+].[Na+].[Al+3].[Al+3].[Al+3].[Al+3].[Al+3].[Al+3].[S-]S[S-].[O-][Si]([O-])([O-])[O-].[O-][Si]([O-])([O-])[O-].[O-][Si]([O-])([O-])[O-].[O-][Si]([O-])([O-])[O-].[O-][Si]([O-])([O-])[O-].[O-][Si]([O-])([O-])[O-] IRERQBUNZFJFGC-UHFFFAOYSA-L 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000003801 milling Methods 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 238000004537 pulping Methods 0.000 description 1
- 238000007873 sieving Methods 0.000 description 1
- 229910052979 sodium sulfide Inorganic materials 0.000 description 1
- GRVFOGOEDUUMBP-UHFFFAOYSA-N sodium sulfide (anhydrous) Chemical compound [Na+].[Na+].[S-2] GRVFOGOEDUUMBP-UHFFFAOYSA-N 0.000 description 1
- 230000001954 sterilising effect Effects 0.000 description 1
- 238000004659 sterilization and disinfection Methods 0.000 description 1
- 235000013799 ultramarine blue Nutrition 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27L—REMOVING BARK OR VESTIGES OF BRANCHES; SPLITTING WOOD; MANUFACTURE OF VENEER, WOODEN STICKS, WOOD SHAVINGS, WOOD FIBRES OR WOOD POWDER
- B27L11/00—Manufacture of wood shavings, chips, powder, or the like; Tools therefor
- B27L11/08—Manufacture of wood shavings, chips, powder, or the like; Tools therefor of wood fibres, e.g. produced by tearing
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27G—ACCESSORY MACHINES OR APPARATUS FOR WORKING WOOD OR SIMILAR MATERIALS; TOOLS FOR WORKING WOOD OR SIMILAR MATERIALS; SAFETY DEVICES FOR WOOD WORKING MACHINES OR TOOLS
- B27G3/00—Arrangements for removing bark-zones, chips, waste, or dust, specially designed for use in connection with wood-working machine or in wood-working plants
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27K—PROCESSES, APPARATUS OR SELECTION OF SUBSTANCES FOR IMPREGNATING, STAINING, DYEING, BLEACHING OF WOOD OR SIMILAR MATERIALS, OR TREATING OF WOOD OR SIMILAR MATERIALS WITH PERMEANT LIQUIDS, NOT OTHERWISE PROVIDED FOR; CHEMICAL OR PHYSICAL TREATMENT OF CORK, CANE, REED, STRAW OR SIMILAR MATERIALS
- B27K3/00—Impregnating wood, e.g. impregnation pretreatment, for example puncturing; Wood impregnation aids not directly involved in the impregnation process
- B27K3/16—Inorganic impregnating agents
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27K—PROCESSES, APPARATUS OR SELECTION OF SUBSTANCES FOR IMPREGNATING, STAINING, DYEING, BLEACHING OF WOOD OR SIMILAR MATERIALS, OR TREATING OF WOOD OR SIMILAR MATERIALS WITH PERMEANT LIQUIDS, NOT OTHERWISE PROVIDED FOR; CHEMICAL OR PHYSICAL TREATMENT OF CORK, CANE, REED, STRAW OR SIMILAR MATERIALS
- B27K3/00—Impregnating wood, e.g. impregnation pretreatment, for example puncturing; Wood impregnation aids not directly involved in the impregnation process
- B27K3/34—Organic impregnating agents
- B27K3/36—Aliphatic compounds
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27K—PROCESSES, APPARATUS OR SELECTION OF SUBSTANCES FOR IMPREGNATING, STAINING, DYEING, BLEACHING OF WOOD OR SIMILAR MATERIALS, OR TREATING OF WOOD OR SIMILAR MATERIALS WITH PERMEANT LIQUIDS, NOT OTHERWISE PROVIDED FOR; CHEMICAL OR PHYSICAL TREATMENT OF CORK, CANE, REED, STRAW OR SIMILAR MATERIALS
- B27K3/00—Impregnating wood, e.g. impregnation pretreatment, for example puncturing; Wood impregnation aids not directly involved in the impregnation process
- B27K3/34—Organic impregnating agents
- B27K3/38—Aromatic compounds
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27K—PROCESSES, APPARATUS OR SELECTION OF SUBSTANCES FOR IMPREGNATING, STAINING, DYEING, BLEACHING OF WOOD OR SIMILAR MATERIALS, OR TREATING OF WOOD OR SIMILAR MATERIALS WITH PERMEANT LIQUIDS, NOT OTHERWISE PROVIDED FOR; CHEMICAL OR PHYSICAL TREATMENT OF CORK, CANE, REED, STRAW OR SIMILAR MATERIALS
- B27K3/00—Impregnating wood, e.g. impregnation pretreatment, for example puncturing; Wood impregnation aids not directly involved in the impregnation process
- B27K3/52—Impregnating agents containing mixtures of inorganic and organic compounds
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27K—PROCESSES, APPARATUS OR SELECTION OF SUBSTANCES FOR IMPREGNATING, STAINING, DYEING, BLEACHING OF WOOD OR SIMILAR MATERIALS, OR TREATING OF WOOD OR SIMILAR MATERIALS WITH PERMEANT LIQUIDS, NOT OTHERWISE PROVIDED FOR; CHEMICAL OR PHYSICAL TREATMENT OF CORK, CANE, REED, STRAW OR SIMILAR MATERIALS
- B27K5/00—Treating of wood not provided for in groups B27K1/00, B27K3/00
- B27K5/0085—Thermal treatments, i.e. involving chemical modification of wood at temperatures well over 100°C
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27K—PROCESSES, APPARATUS OR SELECTION OF SUBSTANCES FOR IMPREGNATING, STAINING, DYEING, BLEACHING OF WOOD OR SIMILAR MATERIALS, OR TREATING OF WOOD OR SIMILAR MATERIALS WITH PERMEANT LIQUIDS, NOT OTHERWISE PROVIDED FOR; CHEMICAL OR PHYSICAL TREATMENT OF CORK, CANE, REED, STRAW OR SIMILAR MATERIALS
- B27K5/00—Treating of wood not provided for in groups B27K1/00, B27K3/00
- B27K5/04—Combined bleaching or impregnating and drying of wood
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27K—PROCESSES, APPARATUS OR SELECTION OF SUBSTANCES FOR IMPREGNATING, STAINING, DYEING, BLEACHING OF WOOD OR SIMILAR MATERIALS, OR TREATING OF WOOD OR SIMILAR MATERIALS WITH PERMEANT LIQUIDS, NOT OTHERWISE PROVIDED FOR; CHEMICAL OR PHYSICAL TREATMENT OF CORK, CANE, REED, STRAW OR SIMILAR MATERIALS
- B27K2200/00—Wooden materials to be treated
- B27K2200/15—Pretreated particles or fibres
Abstract
The invention provides a production system for bleaching lignocellulose, which comprises a pulse dust collector, a cylindrical sieve, a reaction kettle, a pulverizer, a mixer, an air flow dryer, a separator, a wood powder machine, an air screen and a packing scale, wherein the cylindrical sieve, the reaction kettle, the pulverizer, the mixer, the air flow dryer, the separator, the wood powder machine, the air screen and the packing scale are sequentially connected; the separator comprises a first separator and a second separator which are connected, the feeding end of the first separator is connected with the discharging end of the airflow dryer, and the discharging ends of the first separator and the second separator are connected with the feeding end of the wood flour machine; the dust output ends of the second separator, the air screen and the packing scale are connected with the input end of the pulse dust collector, and the output end of the pulse dust collector and the material screening output end of the air screen are connected with the feed end of the wood powder machine; the mixing machine is connected with a bleaching agent dosing device. The invention also provides a production method of the bleached lignocellulose. The invention has the characteristics of continuous production, high production efficiency, economy and environmental protection, and has simple production and preparation process, low cost and strong practicability.
Description
Technical Field
The invention relates to the field of special-shaped bolts, in particular to a production system and a production method for bleached lignocellulose.
Background
Lignocellulose is an organic fibrous substance obtained by chemical treatment and mechanical processing of natural renewable wood. Natural lignocelluloses are mostly the inherent color of wood and are limited in certain fields of application. Bleached lignocellulose is more widely used.
Traditional lignocellulosic bleaching processes are similar to pulping processes, require large amounts of water, and have severe blowdown. Dry bleaching is an innovative process that can bleach materials with minimal water, while producing no pollution emissions. The method should be widely used for producing the lignocellulose filler for the synthetic leather.
The general dry bleaching modes in the industry at present are discontinuous and need to be connected manually; drying is generally carried out in a drying mode, and the occupied area is large; the drying time is long, and the productivity is low; the air-drying easily causes the dust in the production workshop to be large, seriously influences the working environment of production personnel and causes great environmental pollution.
Patent CN103351546B discloses an additive for artificial leather products and a preparation method thereof, which comprises crushed branches, hydrogen peroxide accounting for 5-15% of the total weight of the crushed branches, ultramarine blue accounting for 0.05-1%, glass water accounting for 3-13%, a whitening agent accounting for 0.5-3%, flake caustic soda accounting for 0.5-2% and sodium sulfide accounting for 1-5% of the total weight of the crushed branches. The finished product is obtained by stirring, airing, grinding, powder sieving, quality inspection, sterilization and bagging. The method has the disadvantages that the bleaching effect is poor, whitening agent needs to be added additionally to improve whiteness, and the subsequent milling temperature is too high (200 ℃), so that the product is easy to discolor.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a production system and a production method for bleached lignocellulose, the production system and the production method have the characteristics of continuous production, high production efficiency, economy and environmental protection, thoroughly change the traditional production environment for bleached lignocellulose, reduce environmental pollution, and have the advantages of simple production and preparation process, guaranteed quality, low cost and strong practicability.
According to one aspect of the invention, a production system for bleaching lignocellulose is provided, which comprises a pulse dust collector (8), a cylindrical sieve (1), a reaction kettle (2), a pulverizer (3), a mixer (4), an air flow dryer (5), a separator, a wood powder machine (10), an air screen (11) and a packing scale (12), wherein the cylindrical sieve, the reaction kettle (2), the pulverizer (3), the mixer, the air flow dryer and the packing scale are connected in sequence; the separator comprises a first separator (6) and a second separator (7) which are connected, the feeding end of the first separator (6) is connected with the discharging end of the airflow dryer (5), and the discharging ends of the first separator (6) and the second separator (7) are connected with the feeding end of the wood flour machine (10); the dust output ends of the second separator (7), the air screen (11) and the packing scale (12) are connected with the input end of the pulse dust collector (8), and the output end of the pulse dust collector (8) and the material screening output end of the air screen (11) are connected with the feed end of the wood powder machine (10); the mixer (4) is connected with a bleaching agent dosing device (14). And dust generated in the second separator, the air screen and the packing scale is collected by the pulse dust collector, and dust materials collected in the pulse dust collector and materials sieved by the air screen can return to the wood flour machine for secondary grinding. The devices are connected through the conveying pipeline, the device is directly and automatically conveyed to the next device after the previous device completes corresponding operation, production is continuous, and the devices do not need to be taken out for manual operation, such as direct drying in an airflow dryer and no taking out for airing.
Preferably, the bleaching agent in the bleaching agent adding device (14) is pumped into the mixer (4) through a lifting pump (15).
Preferably, high-temperature and high-pressure steam is introduced into the reaction kettle (2) and the airflow dryer (5).
Preferably, the feeding end of the cylindrical screen (1) is connected with a feeding machine (13), and raw materials are thrown into the cylindrical screen (1) through the feeding machine (13) to remove impurities.
Preferably, the pulse dust collector (8) is connected with a fan (9).
In order to achieve the above object, the present invention also provides a method for producing bleached lignocellulose, comprising the steps of:
firstly, selecting processing byproducts of fresh logs as raw materials, and putting the raw materials into a cylindrical screen (1) through a feeding machine (13) to remove barks and tree scars;
secondly, steaming the raw materials after impurity removal in a reaction kettle (2) filled with high-temperature high-pressure steam, wherein the temperature in the reaction kettle (2) is 150-;
coarsely crushing the raw materials after heat treatment in a crusher (3), wherein the granularity of the coarsely crushed raw materials is 60 meshes, so that the granularity of the raw materials meets the next production requirement;
step four, spraying bleaching solution onto the coarsely crushed raw materials in the mixer (4), stirring the raw materials simultaneously, and continuing stirring for 30-60min after spraying is finished; the bleaching solution is prepared by dissolving hydrogen peroxide and a bleaching assistant in an alkaline aqueous solution with the pH value of 9-13, the mole ratio of the bleaching assistant to the hydrogen peroxide is 1:2, and the bleaching solution contains 3-15% of hydrogen peroxide; the coarsely crushed raw materials are dried and bleached in a mixer, and a bleaching agent is pumped into the mixer by a lift pump to be mixed and reacted with the raw materials;
fifthly, feeding the bleached material into an airflow dryer (5) to be dried until the moisture is 10-15%;
collecting the dried materials through a first separator (6) and a second separator (7), and then feeding the collected materials into a wood powder machine (10) for grinding;
step seven, the ground materials enter an air screen (11) for screening;
and step eight, the screened qualified materials enter a packing scale (12) to be packed into finished products.
Preferably, the raw material is a processing byproduct of poplar, and the processing byproduct of log is used as the raw material, so that the raw material is wide in source and low in cost.
Preferably, the water content of the raw material in the first step is 20-50%, and the water content of the raw material after spraying in the fourth step is controlled to be 25-40%.
Preferably, the alkaline aqueous solution is a mixed solution of one or more of a sodium carbonate aqueous solution, a sodium hydroxide aqueous solution and a sodium metasilicate aqueous solution.
Preferably, the bleaching assistant is tetraacetylethylenediamine or sodium p-nonanoyloxybenzenesulfonate.
Compared with the prior art, the invention has the following beneficial effects:
(1) the production system and the production method of the bleached lignocellulose can bleach substances under the condition of a very small amount of water, do not discharge pollution, have the characteristics of continuous production, high production efficiency, economy and environmental protection, thoroughly change the traditional production environment of the bleached lignocellulose and reduce environmental pollution;
(2) the production system and the production method of the bleached lignocellulose, which are provided by the invention, have the advantages that the production is continuous, the manual connection is not needed, the device does not need to be taken out for manual operation, the device can be directly dried in an airflow dryer, the device does not need to be taken out for airing, the drying is simple and quick, and the problems of large occupied area, long drying time, low capacity, large dust and the like of the traditional airing mode are solved;
(3) according to the production system and the production method of the bleached lignocellulose, the raw materials are subjected to impurity removal, heat treatment, coarse crushing, dry bleaching, drying, fine grinding and screening treatment sequentially through the production system to prepare the bleached lignocellulose, so that the production system is efficient, pollution-free, environment-friendly and low in cost;
(4) the invention relates to a production system and a production method of bleached lignocellulose.A reaction kettle is arranged to ensure that after the raw materials are subjected to heat treatment, lignin is partially degraded under the action of water and heat to generate lignin fragments; meanwhile, after the easily degradable substances such as the hemicellulose and the like are degraded, the activated and degraded lignin is exposed outside, so that the bleaching agent is more fully contacted with the lignin and is easier to bleach during subsequent bleaching;
(5) the production system and the production method of the bleached lignocellulose have the advantages of simple system, ingenious design and obvious effect;
(6) the production system and the production method of the bleached lignocellulose use the log processing by-products as raw materials, and have wide sources and low price;
(7) the production system and the production method of the bleached lignocellulose adopt the low-temperature bleaching assistant and hydrogen peroxide to generate the peroxyacid with stronger oxidation capacity for bleaching, the reaction is mild, the whiteness of the product is improved, the good whitening effect can be achieved without adding a whitening agent, the production system and the production method are environment-friendly and safe, and the product can not be discolored;
(8) the production system and the production method of the bleached lignocellulose, which are provided by the invention, have the advantages of simple production and preparation process, guaranteed quality, low cost and strong practicability, and are suitable for large-scale popularization.
Drawings
Other features, objects and advantages of the invention will become more apparent upon reading of the detailed description of non-limiting embodiments with reference to the following drawings:
FIG. 1 is a schematic connection diagram of a bleached lignocellulose production system;
FIG. 2 is a schematic diagram showing a portion of a bleached lignocellulose production system;
FIG. 3 is a schematic diagram of a second embodiment of a bleached lignocellulose production system;
FIG. 4 is a schematic diagram of a portion of a bleached lignocellulose production system;
in FIGS. 1-4: 1 is a cylinder screen, 2 is a reaction kettle, 3 is a pulverizer, 4 is a mixer, 5 is an air flow dryer, 6 is a first separator, 7 is a second separator, 8 is a pulse dust collector, 9 is a fan, 10 is a wood powder machine, 11 is an air screen, 12 is a packaging scale, 13 is a feeding machine, 14 is a bleaching agent dosing device, and 15 is a lifting pump.
Detailed Description
The present invention will be described in detail with reference to specific examples. The following examples will assist those skilled in the art in further understanding the invention, but are not intended to limit the invention in any way. It should be noted that variations and modifications can be made by persons skilled in the art without departing from the spirit of the invention. All falling within the scope of the present invention.
Example 1
This example provides a bleached lignocellulose production system, the connections of which are shown in detail in figures 1-4: comprises a pulse dust collector 8, a cylindrical sieve 1, a reaction kettle 2, a pulverizer 3, a mixer 4, an air flow dryer 5, a separator, a wood flour machine 10, an air sieve 11 and a packing scale 12 which are connected in sequence; the separator comprises a first separator 6 and a second separator 7 which are connected, the feeding end of the first separator 6 is connected with the discharging end of the airflow dryer 5, and the discharging ends of the first separator 6 and the second separator 7 are both connected with the feeding end of the wood flour machine 10; the dust output ends of the second separator 7, the air screen 11 and the packing scale 12 are connected with the input end of the pulse dust collector 8, and the output end of the pulse dust collector 8 and the material screen residue output end of the air screen 11 are connected with the feed end of the wood powder machine 10; the mixer 4 is connected with a bleaching agent dosing device 14. And dust generated in the second separator, the air screen and the packing scale is collected by the pulse dust collector, and dust materials collected in the pulse dust collector and materials sieved by the air screen can return to the wood flour machine for secondary grinding. The devices are connected through the conveying pipeline, the device is directly and automatically conveyed to the next device after the previous device completes corresponding operation, production is continuous, and the devices do not need to be taken out for manual operation, such as direct drying in an airflow dryer and no taking out for airing.
Further, the bleaching agent in the bleaching agent adding device 14 is pumped into the mixer 4 through the lift pump 15.
Further, high-temperature and high-pressure steam is introduced into the reaction kettle 2 and the airflow dryer 5.
Further, the feed end of the cylindrical screen 1 is connected with a feeding machine 13, and raw materials are fed into the cylindrical screen 1 through the feeding machine 13 to remove impurities.
Further, the pulse dust collector 8 is connected with a fan 9.
The embodiment has the following beneficial effects:
(1) the method can bleach substances under the condition of a very small amount of water, does not produce pollution discharge, has the characteristics of continuous production, high production efficiency, economy and environmental protection, thoroughly changes the traditional production environment for bleaching lignocellulose, and reduces environmental pollution;
(2) the production is continuous, manual connection is not needed, the drying device does not need to be taken out for manual operation in each device, the drying device can be directly used for drying in an airflow dryer, the drying device does not need to be taken out for airing, the drying is simple and quick, and the problems of large occupied area, long drying time, low capacity, large dust and the like of the traditional airing mode are solved;
(3) the raw materials are subjected to impurity removal, heat treatment, coarse crushing, dry bleaching, drying, fine grinding and screening treatment sequentially through the production system to prepare the bleached lignocellulose, so that the production method is efficient, pollution-free, environment-friendly and low in cost;
(4) the reaction kettle is arranged to ensure that after the raw materials are subjected to heat treatment, lignin is partially degraded under the action of water and heat to generate lignin fragments; meanwhile, after the easily degradable substances such as the hemicellulose and the like are degraded, the activated and degraded lignin is exposed outside, so that the bleaching agent is more fully contacted with the lignin and is easier to bleach during subsequent bleaching;
(5) the system is simple, ingenious in design, remarkable in effect, low in cost, high in practicability and suitable for large-scale popularization.
Example 2
In a first aspect, the present example provides a bleached lignocellulose production system, which is constructed as described in example 1.
In a second aspect, the present embodiment also provides a method for producing bleached lignocellulose, comprising the steps of:
firstly, selecting processing byproducts of fresh logs as raw materials, and throwing the raw materials into a cylindrical screen 1 through a feeding machine 13 to remove barks and tree scars;
secondly, steaming the raw materials after impurity removal in a reaction kettle 2 into which high-temperature high-pressure steam is introduced, wherein the temperature in the reaction kettle 2 is 150-;
step three, coarsely crushing the raw materials after heat treatment in a crusher 3, and enabling the granularity of the coarsely crushed raw materials to pass through 60 meshes so that the granularity of the raw materials meets the next production requirement;
step four, spraying the bleaching solution onto the coarsely crushed raw materials in the mixer 4, stirring the raw materials simultaneously, and continuing stirring for 30-60min after spraying is finished; the bleaching solution is prepared by dissolving hydrogen peroxide and a bleaching assistant in an alkaline aqueous solution with the pH value of 9-13, the mole ratio of the bleaching assistant to the hydrogen peroxide is 1:2, and the bleaching solution contains 3-15% of hydrogen peroxide; the coarsely crushed raw materials are dried and bleached in a mixer, and a bleaching agent is pumped into the mixer by a lift pump to be mixed and reacted with the raw materials;
fifthly, feeding the bleached material into an airflow dryer 5 for drying until the moisture content is 10-15%;
sixthly, the dried materials are collected through a first separator 6 and a second separator 7 and then sent into a wood flour machine 10 for grinding;
step seven, the ground materials enter an air screen 11 to be screened;
and step eight, feeding the screened qualified materials into a packing scale 12 to be packed into a finished product.
Furthermore, the raw material is a processing byproduct of poplar, and the processing byproduct of log is used as the raw material, so that the raw material has wide sources and low cost.
Further, the water content of the raw material in the first step is 20-50%, and the water content of the raw material after spraying is controlled to be 25-40% in the fourth step.
Further, the alkaline aqueous solution is a mixed solution of any one or more of a sodium carbonate aqueous solution, a sodium hydroxide aqueous solution and a sodium metasilicate aqueous solution.
Furthermore, the bleaching assistant is tetraacetylethylenediamine or sodium p-nonanoyloxy benzene sulfonate.
The embodiment has the following beneficial effects:
(1) the method can bleach substances under the condition of a very small amount of water, does not produce pollution discharge, has the characteristics of continuous production, high production efficiency, economy and environmental protection, thoroughly changes the traditional production environment for bleaching lignocellulose, and reduces environmental pollution;
(2) the production is continuous, manual connection is not needed, the drying device does not need to be taken out for manual operation in each device, the drying device can be directly used for drying in an airflow dryer, the drying device does not need to be taken out for airing, the drying is simple and quick, and the problems of large occupied area, long drying time, low capacity, large dust and the like of the traditional airing mode are solved;
(3) the raw materials are subjected to impurity removal, heat treatment, coarse crushing, dry bleaching, drying, fine grinding and screening treatment sequentially through the production system to prepare the bleached lignocellulose, so that the production method is efficient, pollution-free, environment-friendly and low in cost;
(4) the reaction kettle is arranged to ensure that after the raw materials are subjected to heat treatment, lignin is partially degraded under the action of water and heat to generate lignin fragments; meanwhile, after the easily degradable substances such as the hemicellulose and the like are degraded, the activated and degraded lignin is exposed outside, so that the bleaching agent is more fully contacted with the lignin and is easier to bleach during subsequent bleaching;
(5) the system is simple, the design is ingenious, and the effect is obvious;
(6) the raw wood processing by-product is used as a raw material, so that the raw wood processing by-product has wide sources and low price;
(7) the low-temperature bleaching assistant and hydrogen peroxide are adopted to generate peroxyacid with stronger oxidation capability for bleaching, the reaction is mild, the whiteness of the product is improved, a whitening agent is not required to be additionally added, a good whitening effect can be achieved, the environment is protected, the safety is realized, and the product is not discolored;
(8) the production and preparation process is simple, the quality is guaranteed, the cost is low, the practicability is high, and the method is suitable for large-scale popularization.
The foregoing description of specific embodiments of the present invention has been presented. It is to be understood that the present invention is not limited to the specific embodiments described above, and that various changes and modifications may be made by one skilled in the art within the scope of the appended claims without departing from the spirit of the invention.
Claims (10)
1. A production system for bleaching lignocellulose is characterized by comprising a pulse dust collector (8), a cylindrical sieve (1), a reaction kettle (2), a pulverizer (3), a mixer (4), an air flow dryer (5), a separator, a wood flour machine (10), an air screen (11) and a packing scale (12), wherein the cylindrical sieve, the reaction kettle (2), the pulverizer (3), the mixer, the air flow dryer (5), the separator, the wood flour machine and the packing scale are sequentially connected; the separator comprises a first separator (6) and a second separator (7) which are connected, the feeding end of the first separator (6) is connected with the discharging end of the airflow dryer (5), and the discharging ends of the first separator (6) and the second separator (7) are connected with the feeding end of the wood flour machine (10); the dust output ends of the second separator (7), the air screen (11) and the packing scale (12) are connected with the input end of the pulse dust collector (8), and the output end of the pulse dust collector (8) and the material screening output end of the air screen (11) are connected with the feed end of the wood powder machine (10); the mixer (4) is connected with a bleaching agent dosing device (14).
2. The bleached lignocellulose production system according to claim 1, wherein the bleaching agent in the bleaching agent dosing device (14) is pumped into the mixer (4) by a lift pump (15).
3. The bleached lignocellulose production system according to claim 1, wherein high-temperature and high-pressure steam is introduced into the reaction kettle (2) and the air flow dryer (5).
4. The bleached lignocellulose production system according to claim 1, wherein the cylindrical screen (1) is connected at its feed end with a feeder (13).
5. A bleached lignocellulose production system according to claim 1, wherein a fan (9) is connected to the pulse precipitator (8).
6. A production method of bleached lignocellulose is characterized by comprising the following steps:
firstly, selecting processing byproducts of fresh logs as raw materials, and putting the raw materials into a cylindrical screen (1) through a feeding machine (13) to remove barks and tree scars;
secondly, steaming the raw materials after impurity removal in a reaction kettle (2) filled with high-temperature high-pressure steam, wherein the temperature in the reaction kettle (2) is 150-;
coarsely crushing the heat-treated raw materials in a crusher (3), wherein the granularity of the coarsely crushed raw materials is 60 meshes;
step four, spraying bleaching solution onto the coarsely crushed raw materials in the mixer (4), stirring the raw materials simultaneously, and continuing stirring for 30-60min after spraying is finished; the bleaching solution is prepared by dissolving hydrogen peroxide and a bleaching assistant in an alkaline aqueous solution with the pH value of 9-13, the mole ratio of the bleaching assistant to the hydrogen peroxide is 1:2, and the bleaching solution contains 3-15% of hydrogen peroxide;
fifthly, feeding the bleached material into an airflow dryer (5) to be dried until the moisture is 10-15%;
collecting the dried materials through a first separator (6) and a second separator (7), and then feeding the collected materials into a wood powder machine (10) for grinding;
step seven, the ground materials enter an air screen (11) for screening;
and step eight, the screened qualified materials enter a packing scale (12) to be packed into finished products.
7. The method for producing bleached lignocellulose according to claim 6, wherein the raw material is a processing by-product of poplar.
8. The method for producing bleached lignocellulose according to claim 6, wherein the moisture content of the raw material in the first step is 20-50%, and the moisture content of the raw material after spraying in the fourth step is controlled to be 25-40%.
9. The method for producing bleached lignocellulose according to claim 6, wherein the alkaline aqueous solution is a mixed solution of any one or more of a sodium carbonate aqueous solution, a sodium hydroxide aqueous solution, and a sodium metasilicate aqueous solution.
10. The method for producing bleached lignocellulose according to claim 6, wherein the bleaching aid is tetraacetylethylenediamine or sodium p-nonanoyloxybenzenesulfonate.
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