CN109629296B - Preparation method of bio-mechanical pulp by hot water treatment and bio-enzyme treatment - Google Patents
Preparation method of bio-mechanical pulp by hot water treatment and bio-enzyme treatment Download PDFInfo
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 50
- 229920001131 Pulp (paper) Polymers 0.000 title claims abstract description 39
- 238000002360 preparation method Methods 0.000 title claims abstract description 9
- 241000209140 Triticum Species 0.000 claims abstract description 113
- 235000021307 Triticum Nutrition 0.000 claims abstract description 113
- 239000010902 straw Substances 0.000 claims abstract description 104
- 239000002994 raw material Substances 0.000 claims abstract description 28
- 238000004537 pulping Methods 0.000 claims abstract description 27
- 239000000463 material Substances 0.000 claims abstract description 21
- 238000000227 grinding Methods 0.000 claims abstract description 16
- 239000002699 waste material Substances 0.000 claims abstract description 16
- 238000001125 extrusion Methods 0.000 claims abstract description 10
- 239000003513 alkali Substances 0.000 claims abstract description 9
- 229940088598 enzyme Drugs 0.000 claims description 57
- 108090000790 Enzymes Proteins 0.000 claims description 44
- 102000004190 Enzymes Human genes 0.000 claims description 44
- 238000000034 method Methods 0.000 claims description 26
- 101710121765 Endo-1,4-beta-xylanase Proteins 0.000 claims description 15
- 108010059820 Polygalacturonase Proteins 0.000 claims description 15
- 108010093305 exopolygalacturonase Proteins 0.000 claims description 15
- 150000001875 compounds Chemical class 0.000 claims description 14
- 108010059892 Cellulase Proteins 0.000 claims description 13
- 229940106157 cellulase Drugs 0.000 claims description 13
- 230000000694 effects Effects 0.000 claims description 13
- 239000007788 liquid Substances 0.000 claims description 13
- 230000008569 process Effects 0.000 claims description 12
- 238000004519 manufacturing process Methods 0.000 claims description 7
- 230000006835 compression Effects 0.000 claims description 6
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- 235000013339 cereals Nutrition 0.000 claims description 4
- 238000007670 refining Methods 0.000 claims 3
- 238000000926 separation method Methods 0.000 claims 1
- 239000000835 fiber Substances 0.000 abstract description 18
- 239000002585 base Substances 0.000 abstract description 14
- 229920006395 saturated elastomer Polymers 0.000 abstract description 12
- 239000000126 substance Substances 0.000 abstract description 11
- 238000004806 packaging method and process Methods 0.000 abstract description 8
- 229920002488 Hemicellulose Polymers 0.000 abstract description 7
- 229920005610 lignin Polymers 0.000 abstract description 6
- 239000001814 pectin Substances 0.000 abstract description 6
- 229920001277 pectin Polymers 0.000 abstract description 6
- 235000010987 pectin Nutrition 0.000 abstract description 6
- 239000000123 paper Substances 0.000 description 55
- 239000011087 paperboard Substances 0.000 description 12
- 239000000203 mixture Substances 0.000 description 9
- 241000274582 Pycnanthus angolensis Species 0.000 description 8
- 238000005516 engineering process Methods 0.000 description 8
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 6
- 238000006243 chemical reaction Methods 0.000 description 6
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- 239000002002 slurry Substances 0.000 description 6
- 230000008676 import Effects 0.000 description 5
- 238000012360 testing method Methods 0.000 description 5
- 238000010009 beating Methods 0.000 description 4
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- 238000005520 cutting process Methods 0.000 description 3
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- 230000009172 bursting Effects 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 238000010411 cooking Methods 0.000 description 2
- 238000003306 harvesting Methods 0.000 description 2
- 238000012856 packing Methods 0.000 description 2
- 230000000704 physical effect Effects 0.000 description 2
- 238000012795 verification Methods 0.000 description 2
- 239000002351 wastewater Substances 0.000 description 2
- 241000196324 Embryophyta Species 0.000 description 1
- 241001668545 Pascopyrum Species 0.000 description 1
- 239000004902 Softening Agent Substances 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000012496 blank sample Substances 0.000 description 1
- 239000011111 cardboard Substances 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 229920002678 cellulose Polymers 0.000 description 1
- 239000001913 cellulose Substances 0.000 description 1
- 230000008859 change Effects 0.000 description 1
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- 125000004122 cyclic group Chemical group 0.000 description 1
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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
- D21C5/00—Other processes for obtaining cellulose, e.g. cooking cotton linters ; Processes characterised by the choice of cellulose-containing starting materials
- D21C5/005—Treatment of cellulose-containing material with microorganisms or enzymes
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- Life Sciences & Earth Sciences (AREA)
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Abstract
The invention relates to a hot water treatment and bio-enzyme treatment cooperated bio-mechanical pulp preparation method, which utilizes crop wheat waste as a pulping raw material, adopts normal-pressure hot water to treat wheat straw, simultaneously adds a trace amount of alkali to adjust the pH value of hot water to 10-14, carries out spiral extrusion treatment after wheat straw is saturated and softened after partial hemicellulose, lignin, pectin and other substances are dissolved out from the wheat straw, leads the wheat straw to be physically divided into filaments, then carries out bio-enzyme treatment, further softens fibers after the bio-enzyme treatment, and then carries out pulp grinding on the wheat straw to meet the requirements of producing primary color packaging paper and paper base materials.
Description
Technical Field
The disclosure belongs to the field of papermaking technology and new materials, and particularly relates to a preparation method of bio-mechanical pulp by hot water treatment and bio-enzyme treatment.
Background
The statements herein merely provide background information related to the present disclosure and may not necessarily constitute prior art.
The paper industry is an important basic raw material industry and plays an important role in national economy. Closely related to social development and social civilization, the consumption level of paper and paperboard is one of the important marks for measuring the modernization and civilization degree of a country. In 2016, the import of paper pulp reaches 2106 ten thousand tons, the import of waste paper reaches 2850 ten thousand tons, the import dependence degree of papermaking fiber raw materials is close to 50 percent, and the import of a large amount of waste paper makes up the gap of the fiber raw materials in China and supports the development of the papermaking industry. The 'reform implementation scheme about the banned foreign garbage entry promotion solid waste import management system' is released in the center of 2017 in 4 months, and the waste paper which is not sorted and is banned from being imported in China from the end of the year is definitely stipulated. The total imported waste paper in 2018 is 33% of that in 2017, and China forbids importing waste paper in 2020. China is facing to lack about 2600 million tons of papermaking raw materials every year. The problem of resource shortage of the traditional paper industry is further highlighted. The problem of shortage of paper making raw materials is solved as soon as possible.
Wheat straw raw material is one of pulping and papermaking plant fiber resources with Chinese characteristics, plays a very important role in the development process of the papermaking industry in China, once occupies a very important position in the pulping raw material structure, and makes a significant contribution to the development of the pulping and papermaking industry in China and even the construction of the whole national economy. However, in the current pulping and papermaking process, wheat straws are generally used only, and wheat leaves, leaf sheaths and the like are removed, so that the full utilization of wheat harvesting waste cannot be realized.
Disclosure of Invention
Aiming at the background technology, the disclosure provides a preparation process of bio-mechanical pulp by using whole wheat straw waste hot water treatment in cooperation with bio-enzyme treatment.
The specific technical scheme is as follows:
in a first aspect of the present disclosure, there is provided a method for producing bio-mechanical pulp by hot water treatment in cooperation with bio-enzyme treatment, the method comprising the steps of:
(1) taking waste wheat straw obtained after wheat grains are obtained as a raw material, carrying out hot water treatment on the wheat straw according to a liquid ratio of 1:4-1:8, simultaneously adding trace alkali, adjusting the pH value of hot water to 10-14, and controlling the treatment temperature to 80-100 ℃ for 15-60 min;
(2) extruding and splitting the wheat straw after the hot water treatment is finished;
(3) reacting the divided wheat straw with an alkaline biological complex enzyme at 40-60 ℃ for 30-90 min;
(4) grinding the biologically treated wheat straw into pulp.
In a second aspect of the disclosure, there is provided a biomechanical slurry produced using the above method.
In a third aspect of the disclosure, there is provided the use of the bio-mechanical pulp for the preparation of a non-overlay paper for corrugated or boxboard paper.
In a fourth aspect of the disclosure, there is provided a paper-based material prepared using the bio-mechanical pulp.
Compared with the related technology known by the inventor, one technical scheme of the present disclosure has the following beneficial effects:
the method utilizes wheat grass waste as a raw material, adopts biotechnology and mechanical method, develops an excellent method for preparing the bio-mechanical pulp under the conditions of ensuring the cyclic utilization of papermaking wastewater, not increasing wastewater discharge and not causing environmental pollution, and solves the problem of shortage of papermaking fiber raw materials to a great extent. Meanwhile, agricultural residues are utilized with high added value, and can be effectively butted with the problem of three agricultural crops, so that the incineration of crop wastes is stopped from the source, and economic and social benefits are realized.
The present disclosure provides a full utilization technology of wheat harvesting waste for the first time aiming at whole wheat waste (wheat straw, wheat leaves and leaf sheaths), and provides a new concept of hot water saturated softening and primary color bio-mechanical pulp; compared with the traditional mechanical pulp, the technology can save the pulping energy by more than 40 percent, and various physical indexes reach the requirements of producing the packing paper and paper base materials. Especially, the paper base material has wide application in the aspects of packaging paper and paper base material such as non-surface layers of corrugated paper and boxboard paper.
The method comprises the steps of utilizing crop wheat wastes as pulping raw materials, treating wheat straws by normal-pressure hot water, simultaneously adding a trace amount of alkali to adjust the pH value of the hot water to 10-14, carrying out wheat straw saturation softening after partial hemicellulose, lignin, pectin and other substances are dissolved out of the wheat straws, carrying out spiral extrusion treatment to physically divide the wheat straws into filaments, carrying out biological enzyme treatment, further softening fibers after the biological enzyme treatment, and then grinding the wheat straws into pulp to meet the requirements of producing primary-color packaging paper-like and paper-based materials. Especially, the paper base material has wide application in the aspects of packaging paper and paper base material such as non-surface layers of corrugated paper and boxboard paper.
Detailed Description
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present disclosure. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of the stated features, steps, operations, and/or combinations thereof, unless the context clearly indicates otherwise.
In the present disclosure, the liquor ratio refers to the ratio of the cooking liquor of the raw materials, and the liquor ratio is the ratio of the weight of the completely dried raw materials to the volume of the total cooking liquor.
In a first exemplary embodiment of the present disclosure, there is provided a method for producing bio-mechanical pulp by hot water treatment in cooperation with bio-enzyme treatment, the method comprising the steps of:
(1) taking waste wheat straw obtained after wheat grains are obtained as a raw material, carrying out hot water treatment on the wheat straw according to a liquid ratio of 1:4-1:8, simultaneously adding trace alkali, adjusting the pH value of hot water to 10-14, and controlling the treatment temperature to 80-100 ℃ for 15-60 min;
(2) extruding and splitting the wheat straw after the hot water treatment is finished;
(3) reacting the divided wheat straw with an alkaline biological complex enzyme at 40-60 ℃ for 30-90 min;
(4) grinding the biologically treated wheat straw into pulp.
The raw material used in the method is waste wheat straw after wheat grains are obtained, and the waste wheat straw comprises wheat leaves, straws and leaf sheaths, wherein the chemical compositions and the chemical structures of different parts are different, in the aspect of the chemical compositions, the ash content, alkali extract and pentosan content of the wheat leaves and the leaf sheaths are higher than those of the straw parts, and the cellulose content is far lower than that of the straw parts; in terms of chemical structure, the fiber of the straw part is longer, the stem base part is longer than the middle part of the stem, and the fiber cells of the wheat leaf and the leaf sheath are shorter and thicker than the straw part. It can be seen that the raw material structure, chemical composition and fiber morphology are very uneven at different wheat straw parts, which causes great difficulty in the subsequent preparation of slurry with excellent performance. Generally, in the prior art, straw is adopted for papermaking, but through innovative research of the applicant, a pulping technology aiming at wholewheat waste is obtained, and by the pulping technology, the utilization rate of wheat straw parts can be improved, and a paper base material with higher surface strength is obtained. The bio-mechanical pulp prepared by the technology has good fiber uniformity, is particularly suitable for preparing packaging paper and paper base materials such as corrugated medium paper, boxboard paper non-surface layers and the like, and can replace imported waste paper raw materials.
In the step (1), the waste wheat straw is cut into standby raw materials with the length of 3-6cm, and the raw materials are air-dried.
In the step (1), the liquid ratio is 1:4-1:8(g/mL), and through a large amount of experimental verification and analysis, the pH value of the water contained in the wheat straw is gradually reduced after the solution with the liquid ratio is adopted for a certain time, so that the pH value of the prepared biomechanical slurry is neutral or weakly alkaline.
In the step (1), adding a trace amount of alkali, adjusting the pH value of hot water to 10-14, wherein the purpose of adding the alkali in the hot water is as follows: on one hand, a small amount of substances such as hemicellulose, lignin, pectin and the like can be dissolved out from wheat, and on the other hand, the wheat straw softening agent can be used for assisting hot water to soften wheat straw as quickly as possible and is used as a basis for next step of spiral extrusion.
In the step (1), the hot water treatment temperature is 80-100 ℃, the time is 15-60min, and the pH value of the wheat straw reaches 7-9 when the treatment is finished. Experiments prove that if the temperature is too low, the whole wheat straw can not be softened by hot water saturation, and the subsequent silk splitting effect is influenced.
In the step (2), a screw extruder is adopted for extruding and splitting, and the process conditions are as follows: the compression ratio of the screw extruder was controlled to be 1: (3-6).
The wheat straw which is saturated with water and softened is subjected to the comprehensive action of various forces such as shearing, stretching, twisting and pressing in the screw extruder, so that the hemicellulose in the wheat straw is further dissolved out, the fiber is damaged to a certain degree, the screw extruder obviously improves the permeability of biological enzyme of the wheat straw, the action effect of the biological enzyme is better, and the using amount is reduced. Through experimental verification, the compression ratio is controlled to be 1: (3-6), the reduction of the fiber length is less affected, and the change of the long fiber component is less.
In the step (3), the liquid ratio is controlled to be 1: 3-8 (g/mL).
Aiming at the specific wheat straw waste raw material after extrusion, the selected alkaline biological compound enzyme is a compound enzyme of xylanase, cellulase and pectinase, and the total dosage is as follows: 10-80IU/mL, wherein the enzyme activity ratio of the xylanase, the cellulase and the pectinase is (3-6): (2-4): (1-1.5); preferably, the total dosage of the enzyme is 60-80 IU/mL.
Experiments prove that the alkaline biological compound enzyme compounded by xylanase, cellulase and pectinase in a specific ratio has an obvious degradation effect and is superior to the compound enzyme in the prior art.
The biological enzyme is obtained from Shandong Longkote enzyme preparation Co., Ltd, and Novexin biological enzyme preparation China Co.
In the step (4), the pulping times are determined according to production requirements, and the pulping degree is controlled to be 25-50 DEG SR.
The pulping process conditions are as follows: and (3) carrying out high-concentration pulping by using a KPF series high-concentration disc grinder, wherein the rotating speed of a main shaft is 3000-4000 r/min, one-stage or two-stage pulping is adopted, and the pulping clearance is 0.15-0.5 mm.
Grinding the biologically treated wheat straw into pulp by a pulp grinder, inactivating biological enzyme by utilizing heat and high temperature generated in the pulp grinding process to prevent the influence on the strength of subsequent pulp, and selecting one-stage grinding or two-stage grinding according to different pulp beating degrees. Tests prove that the prepared bio-mechanical pulp can be used for preparing corrugated raw paper and boxboard non-surface paper with higher paper strength when the pulping degree and the pulping process conditions are adopted.
In a second exemplary embodiment of the present disclosure, a biomechanical slurry produced using the above method is provided. Through determination, the fibers in the bio-mechanical pulp are uniformly dispersed in a staggered mode, the fiber length is uniform, and the strength of the finished paper is good. Subsequent experiments prove that the paper base material prepared from the bio-mechanical pulp has higher bursting index, tearing index and ring crush index, and is suitable for preparing corrugated raw paper, boxboard paper non-surface-layer packing paper and paper base material.
In a third exemplary embodiment of the present disclosure, there is provided a use of the bio-mechanical pulp for making a non-overlay paper of corrugated or boxboard paper.
In a fourth exemplary embodiment of the present disclosure, a paper-based material prepared from the bio-mechanical pulp is provided, wherein the paper-based material is a corrugating medium or a linerboard non-surface paper, and the corrugating medium is one of important constituent materials for producing corrugated cardboards. The non-surface paper of the corrugated paper or the boxboard paper prepared by the bio-mechanical pulp has higher bursting index, tearing index and ring crush index.
In order to make the technical solutions of the present disclosure more clearly understood by those skilled in the art, the technical solutions of the present disclosure will be described in detail below with reference to specific embodiments.
Example 1
A process for producing bio-mechanical pulp by using wheat straw hot water in cooperation with bio-enzyme treatment, which is described in this example, produces bio-mechanical pulp and tests the pulp properties.
(1) Cutting the physically selected and dedusted air-dried wheat straw into 5 cm-long standby raw materials, putting the raw materials into a normal-temperature reaction kettle, and carrying out hot water treatment on the wheat straw according to a liquid ratio of 1:5(g/mL), wherein the temperature is 90 ℃, and the treatment time is controlled to be 20 min.
(2) Adding a trace amount of NaOH into a mixture of hot water and wheat straw in a reaction kettle, adjusting the pH value of the hot water to be 14, dissolving out a small part of substances such as hemicellulose, lignin, pectin and the like from the wheat straw, and reaching the pH value of the wheat straw water content to 9 when the wheat straw is saturated with water and softened.
(3) The water-saturated softened wheat straw is extruded on a screw extruder, and the pressure of the extruder is adjusted to ensure that the wheat straw achieves uniform and good yarn dividing effect. The saturated softening and splitting of the wheat straw are better, the wheat straw is extruded for one time, and the compression ratio of the screw extruder is controlled to be 1: 3.
(4) Treating the softened and devillicated wheat straw and alkaline biological enzyme in a bioreactor for 50min at 50 deg.C and liquid ratio of 1:4(g/mL), and stirring to obtain mixed wheat straw and biological enzyme, so as to soften wheat straw fiber.
The alkaline biological compound enzyme is a compound enzyme of xylanase, cellulase and pectinase, the total dosage is 80IU/mL (80 IU biological enzyme is adopted in 1mL feed liquid), and the enzyme activity ratio of the xylanase, the cellulase and the pectinase is 3: 2: 1.
(5) the bio-treated wheat straw is ground into pulp by a pulping machine for two sections, so that the pulp beating degree reaches 40 DEG SR.
The technological parameters of the pulp grinding are as follows: and (3) carrying out high-concentration grinding by using a KPF high-concentration disc grinder, wherein the rotating speed of a main shaft is 3000r/min, and the grinding gap is 0.2 mm.
(6) Defibering the grinded wheat straw bio-mechanical pulp by a defibering device to uniformly mix the wheat straw bio-mechanical pulp, and then making and forming 70g/m on a paper sheet former2The primary color corrugated paper. Then, the physical strength was measured. All physical indexes meet the requirements of producing primary color packaging paper and paper base materials.
(7) The bio-enzyme after the screw extrusion is adjusted to be a compound enzyme using xylanase and pectinase, the total dosage is 80IU/mL, and the enzyme activity ratio of the xylanase to the pectinase is 2: 1, the other processes were not changed as comparative tests, and the obtained bio-mechanical pulp was used as a comparative sample.
TABLE 1 comparison summary of physical properties of pulp obtained by using wheat straw hot water in cooperation with bio-enzyme treatment to prepare bio-mechanical pulp
Example 2
In the example of the process for preparing the bio-mechanical pulp by combining wheat straw hot water with bio-enzyme treatment, the bio-mechanical pulp is prepared into primary-color corrugated paper, and the pulp forming performance of the primary-color corrugated paper is tested.
(1) Cutting the physically selected and dedusted air-dried wheat straw into 5 cm-long standby raw materials, putting the raw materials into a normal-temperature reaction kettle, and carrying out hot water treatment on the wheat straw according to a liquid ratio of 1:4(g/mL), wherein the temperature is 100 ℃, and the treatment time is controlled to be 25 min.
(2) Adding a trace amount of alkali KOH into a mixture of hot water and wheat straw in a reaction kettle, adjusting the pH value of the hot water to be 13, dissolving out a small part of substances such as hemicellulose, lignin, pectin and the like from the wheat straw, and reaching the pH value of the wheat straw water to 8 when the wheat straw is saturated with water and softened.
(3) The water-saturated softened wheat straw is extruded on a screw extruder, and the pressure of the extruder is adjusted to ensure that the wheat straw achieves uniform and good yarn dividing effect. The saturated softening and devillicating of the wheat straw are better, and the extrusion is carried out for one time; the compression ratio of the screw extruder was controlled to 1: 4.
(4) Treating the softened and devillicated wheat straw and alkaline biological enzyme in a bioreactor for 40min at 55 deg.C and 1:5(g/mL) liquid ratio, and stirring to obtain mixed wheat straw and biological enzyme, so as to soften wheat straw fiber.
The alkaline biological compound enzyme is a compound enzyme of xylanase, cellulase and pectinase, the total dosage is 60IU/mL, and the enzyme activity ratio of the xylanase, the cellulase and the pectinase is 5: 4: 1.5.
(5) the bio-treated wheat straw is ground into pulp by a pulping machine for two sections, so that the pulp beating degree reaches 42 DEG SR.
The technological parameters of the pulp grinding are as follows: and (3) carrying out high-concentration grinding by using a KPF high-concentration disc grinder, wherein the rotating speed of a main shaft is 3000r/min, and the grinding gap is 0.25 mm.
(6) Defibering the grinded wheat straw bio-mechanical pulp by a defibering device to uniformly mix the wheat straw bio-mechanical pulp, and then making and forming 80g/m on a paper forming device2The primary color corrugated paper. Then, the physical strength was measured. Various physical indexes meet the requirements of producing primary color packaging paper and paper base materials.
(7) The bio-enzyme after the screw extrusion is adjusted to be a compound enzyme using three enzymes of xylanase, cellulase and pectinase, the total dosage is 60IU/mL, the enzyme activity ratio of the xylanase, the cellulase and the pectinase is 1:1:1, other processes are not changed to be used as a comparison test, and the obtained bio-mechanical pulp is used as a comparison sample.
TABLE 2 comparison list of physical performance indexes of slurry prepared by using wheat straw hot water in cooperation with biological enzyme treatment to prepare bio-mechanical slurry
Example 3
A process for preparing the raw-colour corrugated paper of biological mechanical pulp features that the wheat straw and hot water are used in conjunction with the enzyme treatment to prepare the raw-colour corrugated paper, and the pulp forming performance is tested.
(1) Cutting the physically selected and dedusted air-dried wheat straw into 5 cm-long standby raw materials, placing the raw materials into a normal-temperature processor or a reaction kettle, and carrying out hot water treatment on the wheat straw according to a liquid ratio of 1:6(g/mL), wherein the temperature is 100 ℃, and the treatment time is controlled to be 30 min.
(2) Adding a trace amount of NaOH into a mixture of hot water and wheat straw in a reaction kettle, adjusting the pH value of the hot water to be 13, dissolving out a small part of substances such as hemicellulose, lignin, pectin and the like from the wheat straw, and enabling the pH value of the wheat straw containing water to reach 8 when the wheat straw is saturated with water and softened.
(3) The water-saturated softened wheat straw is extruded on a screw extruder, and the pressure of the extruder is adjusted to ensure that the wheat straw achieves uniform and good yarn dividing effect. The saturated softening and devillicating of the wheat straw are better, and the extrusion is carried out for one time; the compression ratio of the screw extruder was controlled to 1: 5.
(4) Treating the softened and devillicated wheat straw and alkaline biological enzyme in a bioreactor for 60min at 50 deg.C and liquid ratio of 1:4(g/mL), and stirring to obtain mixed wheat straw and biological enzyme, so as to soften wheat straw fiber.
The alkaline biological compound enzyme is a compound enzyme of xylanase, cellulase and pectinase, the total dosage is 40IU/mL, and the enzyme activity ratio of the xylanase, the cellulase and the pectinase is 6: 4: 1.5.
(5) and (3) pulping the biologically treated wheat straws by using a pulping machine to ensure that the pulp beating degree reaches 41 DEG SR.
The technological parameters of the pulp grinding are as follows: and (3) carrying out high-concentration pulping by using a KPF high-concentration disc grinder, wherein the rotating speed of a main shaft is 3000r/min, and a section of pulping is adopted, and the pulping clearance is 0.15 mm.
(6) Defibering the grinded wheat straw bio-mechanical pulp in a defibering device to uniformly mix the wheat straw bio-mechanical pulp and the paper sheet forming deviceMaking and forming 50g/m2The primary color corrugated paper. Then, the physical strength was measured. Various physical indexes meet the requirements of producing primary color packaging paper and paper base materials.
(7) And removing the bio-enzyme treatment section after the screw extrusion, taking the other processes unchanged as blank samples to perform a comparison test, and taking the obtained mechanical pulp as a comparison sample.
TABLE 3 comparison summary of physical properties of pulp obtained by using wheat straw hot water in cooperation with bio-enzyme treatment to prepare bio-mechanical pulp
The above embodiments are preferred embodiments of the present disclosure, but the embodiments of the present disclosure are not limited to the above embodiments, and any other changes, modifications, substitutions, combinations, and simplifications which do not depart from the spirit and principle of the present disclosure should be regarded as equivalent replacements within the scope of the present disclosure.
Claims (10)
1. A preparation method of bio-mechanical pulp by hot water treatment and bio-enzyme treatment is characterized by comprising the following steps:
(1) taking waste wheat straw obtained after wheat grains are obtained as a raw material, carrying out hot water treatment on the wheat straw according to a liquid ratio of 1:4-1:8, simultaneously adding trace alkali, adjusting the pH value of hot water to 10-14, and controlling the treatment temperature to 80-100 ℃ for 15-60 min;
(2) extruding and splitting the wheat straw after the hot water treatment is finished;
(3) reacting the divided wheat straw with an alkaline biological complex enzyme at 40-60 ℃ for 30-90 min;
(4) grinding the biologically treated wheat straw into pulp;
in the step (3), the alkaline biological compound enzyme is a compound enzyme of xylanase, cellulase and pectinase, and the total dosage is as follows: 10-80IU/mL, wherein the enzyme activity ratio of the xylanase, the cellulase and the pectinase is (3-6): (2-4): (1-1.5).
2. The method of claim 1, wherein in step (1), the waste wheat straw is cut into 3-6cm long stock.
3. The method according to claim 1, wherein in the step (1), the pH of the wheat straw is 7 to 9 at the end of the treatment.
4. The method according to claim 1, wherein in the step (2), the extrusion and filament separation are carried out by using a screw extruder under the following process conditions: the compression ratio of the screw extruder was controlled to be 1: (3-6).
5. The method according to claim 1, wherein the total amount of the enzyme is 30 to 80 IU/mL.
6. The method of claim 1, wherein in step (4), the number of refining steps is determined according to production requirements, and the degree of refining is controlled to be 25-50 ° SR.
7. The manufacturing method according to claim 1, wherein in the step (4), the refining process conditions are as follows: and (3) carrying out high-concentration pulping by using a KPF series high-concentration disc grinder, wherein the rotating speed of a main shaft is 3000-4000 r/min, one-stage or two-stage pulping is adopted, and the pulping clearance is 0.15-0.5 mm.
8. The bio-mechanical pulp prepared by the method of any one of claims 1 to 7.
9. Use of the biomechanical pulp of claim 8 in making corrugated paper.
10. A paper-based material made from the bio-mechanical pulp of claim 8, wherein said paper-based material is corrugated board paper or linerboard non-face wrapper.
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| CN110205851A (en) * | 2019-06-22 | 2019-09-06 | 李克明 | Rice and kernel grass stalk fibre manufacturing process |
| CN112160180A (en) * | 2020-09-15 | 2021-01-01 | 内蒙古林乐生物能源有限责任公司 | Production process of biochemical mechanical pulp |
| CN112726254B (en) * | 2020-12-31 | 2023-07-28 | 齐鲁工业大学 | Method for preparing natural color biomechanical pulp and fully utilizing byproducts by combining hot water treatment and biological enzyme treatment on wheat straw |
| CN113265898B (en) * | 2021-06-11 | 2022-08-26 | 齐鲁工业大学 | Method for pulping wheat straw by using xylanase and pectinase |
| CN113832769B (en) * | 2021-09-06 | 2023-01-10 | 天津科技大学 | Biomass-based papermaking reinforcing agent prepared from agricultural residues as raw materials, method and application |
| CN114921992B (en) * | 2022-06-01 | 2023-04-28 | 齐鲁工业大学 | Preparation method of bio-mechanical pulp treated by biological enzyme |
| CN114837007B (en) * | 2022-06-01 | 2023-05-23 | 齐鲁工业大学 | Method for pulping wheat straw by using composite microbial inoculum |
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