CN113265898A - Method for pulping wheat straw by using xylanase and pectinase - Google Patents

Method for pulping wheat straw by using xylanase and pectinase Download PDF

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Publication number
CN113265898A
CN113265898A CN202110655670.7A CN202110655670A CN113265898A CN 113265898 A CN113265898 A CN 113265898A CN 202110655670 A CN202110655670 A CN 202110655670A CN 113265898 A CN113265898 A CN 113265898A
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China
Prior art keywords
pulping
xylanase
pectinase
wheat straw
treatment
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CN202110655670.7A
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Chinese (zh)
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CN113265898B (en
Inventor
王瑞明
卫姗
刘开泉
吉兴香
李丕武
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Qilu University of Technology
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Qilu University of Technology
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Priority to LU500846A priority patent/LU500846B1/en
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Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H11/00—Pulp or paper, comprising cellulose or lignocellulose fibres of natural origin only
    • D21H11/12—Pulp from non-woody plants or crops, e.g. cotton, flax, straw, bagasse
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21B—FIBROUS RAW MATERIALS OR THEIR MECHANICAL TREATMENT
    • D21B1/00—Fibrous raw materials or their mechanical treatment
    • D21B1/02—Pretreatment of the raw materials by chemical or physical means
    • D21B1/021—Pretreatment of the raw materials by chemical or physical means by chemical 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
    • D21C1/00—Pretreatment of the finely-divided materials before digesting
    • D21C1/02—Pretreatment of the finely-divided materials before digesting with water or steam
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
    • D21C1/00—Pretreatment of the finely-divided materials before digesting
    • D21C1/04—Pretreatment of the finely-divided materials before digesting with acid reacting compounds
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
    • D21C1/00—Pretreatment of the finely-divided materials before digesting
    • D21C1/06—Pretreatment of the finely-divided materials before digesting with alkaline reacting compounds
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
    • D21C3/00—Pulping cellulose-containing materials
    • D21C3/02—Pulping cellulose-containing materials with inorganic bases or alkaline reacting compounds, e.g. sulfate processes
    • 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
    • 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
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21D—TREATMENT OF THE MATERIALS BEFORE PASSING TO THE PAPER-MAKING MACHINE
    • D21D1/00—Methods of beating or refining; Beaters of the Hollander type
    • D21D1/20—Methods of refining

Abstract

The invention belongs to the technical field of biology, and relates to a method for pulping wheat straws by using xylanase and pectinase, which comprises the following steps: carrying out swelling treatment on the wheat straws; treating the wheat straw subjected to swelling treatment in an alkaline solution, and then adjusting the pH value to be neutral; and (3) under a neutral condition, carrying out enzyme treatment and pulping on the pulp subjected to the alkaline solution treatment by adopting a mixed solution of xylanase and pectinase. The pulping mode of the invention takes agricultural waste-wheat straw as a main raw material, has important significance for recycling of biomass resources, and reduces the dosage of chemical reagents and the pulping energy consumption by using the combined treatment of xylanase and pectinase; meanwhile, the cooking process of the raw materials is cancelled, and the target beating degree can be obtained under the conditions of normal temperature and normal pressure.

Description

Method for pulping wheat straw by using xylanase and pectinase
Technical Field
The invention belongs to the technical field of biology, and relates to a pulping mode for wheat straw pulping at normal temperature and normal pressure by using biological enzyme.
Background
The information in this background section is only for enhancement of understanding of the general background of the invention and is not necessarily to be construed as an admission or any form of suggestion that this information forms the prior art that is already known to a person of ordinary skill in the art.
The paper making industry faces worldwide problems of energy shortage, large environmental pressure, shortage of paper making raw materials and the like, and needs to be reformed and transformed urgently. In modern times, papermaking raw materials mainly comprise wood, but wood resources in China are in shortage gradually, and in recent years, wood resources increasingly depend on import, so that other papermaking materials are required to be quickly searched for to replace wood so as to avoid uncontrolled forest cutting and the following ecological problems. The pollution of pulping by non-wood fiber raw materials is serious compared with the pollution of wood fiber raw materials, the waste liquid obtained by pulping by the non-wood fiber raw materials is generally recycled by an alkaline method, and some substances which can be recycled in the waste liquid are recycled. However, "pollution is treated before treatment" is not a good solution, and both treatment cost and manpower and material resources are huge pressure for small-scale paper mills, so that the problems need to be solved fundamentally, the pulping process is improved, and waste liquid pollution is reduced as much as possible, which has important significance for environmental protection and human development.
Mechanical pulping and chemical pulping are two commonly used pulping modes in the pulping and papermaking industry, and the two pulping modes are often used in combination. Mechanical pulping has a relatively high energy consumption, and therefore, there is a continuing need for pulping methods that can effectively reduce energy consumption. In addition, the addition of chemical agents in the chemical pulping process causes the emission of many toxic substances in the nature, and the toxic substances are extremely harmful to animals and human beings.
The biological enzyme preparation has the advantages of mild reaction conditions and high reaction efficiency, and can achieve the purposes of saving resources and reducing pulping energy consumption in the pulping and papermaking industry. In addition, the addition of enzymes in the biological pulping process can increase the brightness of the pulp to a certain extent and improve the strength performance of the pulp. In a word, the enzyme preparation is utilized to treat the pulping raw material, the reaction process is simple and controllable, the change of temperature and pH value can not generate great influence on the polymerization degree of cellulose, the production cost is higher, and the possibility of putting into production is higher on the whole.
Disclosure of Invention
Aiming at the problems of environmental pollution and high energy consumption of chemical mechanical pulping, the invention establishes a pulping mode under the conditions of normal temperature and normal pressure according to the actual situation, and the pulping mode has the advantages that: the addition amount of chemical agents is reduced, so that the emission of harmful substances is reduced; meanwhile, the energy consumption of pulping is reduced due to the addition of the enzyme.
In order to achieve the technical purpose, the invention adopts the following technical scheme:
in a first aspect of the present invention, there is provided a method for pulping wheat straw by using xylanase and pectinase, comprising:
carrying out swelling treatment on the wheat straws;
treating the wheat straw subjected to swelling treatment in an alkaline solution, and then adjusting the pH value to be neutral;
and (3) under a neutral condition, carrying out enzyme treatment and pulping on the pulp subjected to the alkaline solution treatment by adopting a mixed solution of xylanase and pectinase.
Research and development find that: under the conditions of normal temperature, normal pressure and neutrality, the combined process of swelling, KOH treatment and enzyme treatment is adopted for pulping, and the method has certain application value for reducing pulping pollution and pulping energy consumption.
In a second aspect of the invention, there is provided a pulp prepared by any of the above methods.
In a third aspect of the invention, the application of the mixture of xylanase and pectinase in wheat straw pulping is provided.
The invention has the beneficial effects that:
(1) the pulping mode of the invention takes agricultural waste-wheat straw as a main raw material, has important significance for recycling of biomass resources, and reduces the dosage of chemical reagents and the pulping energy consumption by using the combined treatment of xylanase and pectinase; meanwhile, the cooking process of the raw materials is cancelled, and the target beating degree can be obtained under the conditions of normal temperature and normal pressure.
(2) The operation method is simple, low in cost, universal and easy for large-scale production.
Detailed Description
It is to be understood that the following detailed description is exemplary and is intended to provide further explanation of the invention as claimed. 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 invention 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 exemplary embodiments according to the invention. 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 stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
Interpretation of terms
The "number of revolutions" in the present invention means: total number of revolutions of the refining process.
A method for pulping wheat straw by using xylanase and pectinase comprises the following steps:
(1) placing the naturally air-dried wheat straws and water in a water bath according to the proportion of 1:8 for swelling treatment for 2 hours;
(2) adding 1.5% potassium hydroxide (KOH) solution for treatment, standing for 1h, and adjusting pH to neutral with phosphoric acid solution;
(3) under the neutral condition, adding mixed liquor of xylanase and pectinase at a proper temperature, wherein the addition amount is 10U/g absolute dry pulp respectively, and reacting for 30 min;
(4) the treated sample was ground by a refiner at a number of revolutions set at 3000 r.
The above is only a preliminary determination of the process path, and the parameters in the process flow can be adjusted appropriately.
In some embodiments, the swelling treatment has a volume ratio of wheat straw to water of 1: 6-10, preferably 1: 8.
swelling is an important process for pulping. In the swelling process, hydroxyl contained in cellulose and hemicellulose in the wheat straws and water molecules act, and the water molecules enter an amorphous region of the cellulose and form hydrogen bonds with adsorbed water molecules, which is caused by the characteristic that the amorphous region is relatively irregular and is easy to adsorb the water molecules. The space between cellulose molecular chains is enlarged during swelling, the specific volume and the specific surface area of the cellulose are increased, the fiber diameter is enlarged, and the fiber is deformed, thereby being beneficial to subsequent pulping.
In some embodiments, the swelling treatment time is 1 to 3 hours, preferably 2 hours.
In some embodiments, the alkaline solution is a potassium hydroxide solution, preferably, the potassium hydroxide solution has a molar concentration of 1.5%. KOH ionizes in water to form K+And OH-，OH-At a higher temperature, the lignin molecules act on the phenolic structure of the lignin molecules to break ct-aromatic ether bonds (X-alkyl bonds) in the lignin molecules, and also break P-aromatic ether bonds and methyl aryl ether bonds in the non-phenolic structure, so that the lignin molecules are reduced, and hydrophilic groups are introduced into the smaller lignin molecules to dissolve the lignin into the pulp, so that the lignin is separated from fibers.
In some embodiments, the treatment time in the alkaline solution is 0.8 to 1.2 hours, preferably 1 hour.
In some embodiments, the total amount of xylanase used in the mixture of xylanase and pectinase is 10U/g oven dried pulp, and the ratio of xylanase to pectinase is 1:1 to 2.
In some embodiments, the time of the enzyme treatment is 20-40 min, preferably 30 min.
In some embodiments, the number of refining revolutions is 2500 to 3000r, preferably 2500r or 2850 r.
The present invention is described in further detail below with reference to specific examples, which are intended to be illustrative of the invention and not limiting.
Example 1:
(1) placing the naturally air-dried wheat straws and water in a water bath according to the proportion of 1:7 for swelling treatment for 2 hours;
(2) adding 2.0% potassium hydroxide (KOH) solution for treatment, standing for 1h, and adjusting pH to neutral with phosphoric acid solution;
(3) under a neutral condition, adding a mixed solution of xylanase and pectinase at 80 ℃, wherein the adding ratio of the xylanase to the pectinase is 1:1, the adding amount of the xylanase to the pectinase is 10U/g of oven-dried pulp, and reacting for 30 min;
(4) the treated sample was ground by a refiner at a number of revolutions set at 2500 r.
The degree of pulp beating measured by the above procedure was 44.33 ° SR.
Example 2:
(1) placing the naturally air-dried wheat straws and water in a water bath according to the ratio of 1:7.56 for swelling treatment for 2 hours;
(2) adding 1.75% potassium hydroxide (KOH) solution for treatment, standing for 1h, and adjusting pH to neutral with phosphoric acid solution;
(3) under a neutral condition, adding a mixed solution of xylanase and pectinase at 80 ℃, wherein the adding ratio of the xylanase to the pectinase is 1:1, the adding amount of the xylanase to the pectinase is 10U/g of oven-dried pulp, and reacting for 30 min;
(4) the processed sample was ground by a refiner at a rotation number of 2850 r.
The degree of pulp beating measured by the above procedure was 43 ° SR.
Example 3:
compared with the embodiment 1, the rotation number is adjusted and the relation with the beating degree is tested under the condition that other factors are not changed, and the result shows that: when the rotation number reaches 2000-3000r, 40-45 SR can be reached, which is the same as the normal requirement of the factory.
It should be noted that the above-mentioned embodiments are only preferred embodiments of the present invention, and the present invention is not limited thereto, and although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications and equivalents can be made in the technical solutions described in the foregoing embodiments, or equivalents thereof. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention. Although the present invention has been described with reference to the specific embodiments, it should be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention.

Claims (10)

1. A method for pulping wheat straw by using xylanase and pectinase is characterized by comprising the following steps:
carrying out swelling treatment on the wheat straws;
treating the wheat straw subjected to swelling treatment in an alkaline solution, and then adjusting the pH value to be neutral;
and (3) under a neutral condition, carrying out enzyme treatment and pulping on the pulp subjected to the alkaline solution treatment by adopting a mixed solution of xylanase and pectinase.
2. The method of pulping wheat straw with xylanase and pectinase according to claim 1 wherein the volume ratio of wheat straw to water in the swelling treatment is 1: 6-10, preferably 1: 8.
3. the method for wheat straw pulping by using xylanase and pectinase according to claim 1, wherein the swelling treatment time is 1-3 h, preferably 2 h.
4. The method for wheat straw pulping using xylanase and pectinase according to claim 1 wherein the alkaline solution is potassium hydroxide solution, preferably the potassium hydroxide solution has a molar concentration of 1.5%.
5. The method for wheat straw pulping by using xylanase and pectinase according to claim 1, wherein the treatment time in alkaline solution is 0.8-1.2 h, preferably 1 h.
6. The method for wheat straw pulping by using xylanase and pectinase according to claim 1, wherein the total dosage of the enzyme in the mixed solution of xylanase and pectinase is 10U/g absolute dry pulp, and the ratio of xylanase to pectinase is 1:1 to 2.
7. The method for wheat straw pulping by using xylanase and pectinase according to claim 1, wherein the enzyme treatment time is 20-40 min, preferably 30 min.
8. The method for wheat straw pulping by using xylanase and pectinase according to claim 1, wherein the number of revolutions of the pulping is 2500-3000 r, preferably 2500r or 2850 r.
9. A pulp produced by the method of any of claims 1-8.
10. The application of the mixture of xylanase and pectinase in wheat straw pulping.
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LU500846A LU500846B1 (en) 2021-06-11 2021-11-10 Method for pulping wheat straw by using xylanase and pectinase

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114922003A (en) * 2022-04-22 2022-08-19 安徽文峰新材料科技股份有限公司 Preparation method of waterproof stain-resistant photographic paper
CN115012240A (en) * 2022-06-02 2022-09-06 上海昶法新材料有限公司 Corn straw full-stalk enzymatic pulping method and paper pulp
CN115584652A (en) * 2022-11-07 2023-01-10 齐鲁工业大学 Wheat straw pulping method and product of KOH synergistic biological enzyme preparation
CN115652675A (en) * 2022-10-31 2023-01-31 齐鲁工业大学 Bio-mechanical pulping method using compound microorganism and product
CN117390868A (en) * 2023-10-25 2024-01-12 齐鲁工业大学(山东省科学院) Dynamic model of pulping process taking content of soluble solids as parameter
CN117390870A (en) * 2023-10-25 2024-01-12 齐鲁工业大学(山东省科学院) Pulping dynamics model based on reducing sugar and soluble solid content

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CN109629296A (en) * 2018-12-29 2019-04-16 齐鲁工业大学 A kind of biological mechanical pulp preparation method of hot water treatment collaboration cellulase treatment
CN111364271A (en) * 2020-04-02 2020-07-03 长沙瑞福尼新材料科技有限公司 Method for preparing bio-mechanical pulp by utilizing whole straw of corn straw

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CN109629296A (en) * 2018-12-29 2019-04-16 齐鲁工业大学 A kind of biological mechanical pulp preparation method of hot water treatment collaboration cellulase treatment
CN111364271A (en) * 2020-04-02 2020-07-03 长沙瑞福尼新材料科技有限公司 Method for preparing bio-mechanical pulp by utilizing whole straw of corn straw

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Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114922003A (en) * 2022-04-22 2022-08-19 安徽文峰新材料科技股份有限公司 Preparation method of waterproof stain-resistant photographic paper
CN115012240A (en) * 2022-06-02 2022-09-06 上海昶法新材料有限公司 Corn straw full-stalk enzymatic pulping method and paper pulp
CN115652675A (en) * 2022-10-31 2023-01-31 齐鲁工业大学 Bio-mechanical pulping method using compound microorganism and product
CN115584652A (en) * 2022-11-07 2023-01-10 齐鲁工业大学 Wheat straw pulping method and product of KOH synergistic biological enzyme preparation
CN115584652B (en) * 2022-11-07 2023-10-24 齐鲁工业大学 Wheat straw pulping method and product by utilizing KOH and biological enzyme preparation
CN117390868A (en) * 2023-10-25 2024-01-12 齐鲁工业大学(山东省科学院) Dynamic model of pulping process taking content of soluble solids as parameter
CN117390870A (en) * 2023-10-25 2024-01-12 齐鲁工业大学(山东省科学院) Pulping dynamics model based on reducing sugar and soluble solid content
CN117390870B (en) * 2023-10-25 2024-03-19 齐鲁工业大学(山东省科学院) Pulping dynamics model based on reducing sugar and soluble solid content
CN117390868B (en) * 2023-10-25 2024-03-22 齐鲁工业大学(山东省科学院) Method for establishing dynamic model of pulping process by taking content of soluble solids as parameter

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