CN114622432B - Method for treating secondary starch in OCC pulping process - Google Patents

Method for treating secondary starch in OCC pulping process Download PDF

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Publication number
CN114622432B
CN114622432B CN202210223636.7A CN202210223636A CN114622432B CN 114622432 B CN114622432 B CN 114622432B CN 202210223636 A CN202210223636 A CN 202210223636A CN 114622432 B CN114622432 B CN 114622432B
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starch
nanocellulose
biocide
secondary starch
corrugated paper
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CN114622432A (en
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程正柏
张小红
徐清凉
张晨健
安兴业
刘洪斌
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Zhejiang Jingxing Paper Joint Stock Co ltd
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Zhejiang Jingxing Paper Joint Stock Co ltd
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    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
    • D21C9/00—After-treatment of cellulose pulp, e.g. of wood pulp, or cotton linters ; Treatment of dilute or dewatered pulp or process improvement taking place after obtaining the raw cellulosic material and not provided for elsewhere
    • 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
    • D21C5/02—Working-up waste paper
    • 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
    • D21C5/02—Working-up waste paper
    • D21C5/022—Chemicals therefor
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W30/00—Technologies for solid waste management
    • Y02W30/50—Reuse, recycling or recovery technologies
    • Y02W30/64—Paper recycling

Abstract

The invention relates to a method for treating secondary starch in an OCC pulping process, which comprises the following steps: s1, obtaining a pulp flow of at least recycled fibers and secondary starch, S2, adding amylase inhibitor and biocide to the pulp flow, S3, and enabling nanocellulose and secondary starch to interact to form agglomerates; the invention has the advantages that: the amylase inhibitor and the biocide are used for preventing secondary starch from being degraded, and agglomerates are formed through interaction of the nanocellulose and the secondary starch, so that the retention of the secondary starch is improved, the paper forming strength of paper is increased, the consumption of surface sizing starch is reduced, the amount of new starch to be added is greatly reduced, meanwhile, COD (chemical oxygen demand) of wastewater to be treated is reduced, and pulping wastewater formed after treatment is reduced by at least 20% compared with the COD value of wastewater formed before treatment, so that the treatment cost of wastewater is greatly reduced.

Description

Method for treating secondary starch in OCC pulping process
Technical Field
The invention relates to a method for treating secondary starch in OCC pulping process.
Background
Waste corrugated paper (OCC) is generally used as a raw material of corrugated board, while old corrugated paper (OCC) raw material contains many other substances besides fibers, since most of corrugated board needs to be surface-sized, and a corrugated structure needs starch glue to be bonded, starch is usually uncharged and has a smaller particle size and is difficult to be remained on the fibers, and is called secondary starch, so that the part of low molecular weight secondary starch is remained in the water circulation of pulping and papermaking processes, continuous enrichment is increased, the risk of microorganism growth is increased, since starch is a nutrient substance of various microorganisms, the generation of microorganisms can bring about a series of problems to the performance of paper, acidic substances secreted by microorganisms can reduce the pH of the whole system, the reduction of pH can promote the growth of microorganisms, the microorganisms can generate mucus and biological films on the surfaces of grooves and machine frames, paper defects such as spots and holes or paper web breakage when mucus pieces fall off, the enrichment of secondary starch in wastewater can lead to COD in wastewater, and increased treatment cost.
Disclosure of Invention
The invention aims to provide a method for treating secondary starch in an OCC pulping process, which can effectively prevent the degradation of the secondary starch and improve the retention of the secondary starch which is not degraded.
In order to solve the technical problems, the invention is realized by the following technical scheme: a method for treating secondary starch in an OCC pulping process comprising the steps of:
s1: obtaining a pulp stream comprising an aqueous phase and at least recycled fibers and secondary starch dispersed in the aqueous phase;
s2: adding an amylase inhibitor and a biocide to the pulp stream obtained in S1, wherein: the mass ratio of the amylase inhibitor to the biocide is 1:1-100:1;
s3: adding nanocellulose prepared by homogenizing pulp fibers under high pressure into the pulp flow treated by S2, and enabling the nanocellulose and secondary starch to interact to form agglomerates, wherein: the mass fraction of the nanocellulose is 0-20%.
Preferably, the secondary starch in step S1 is an oxidized starch or an acid-modified starch or an enzyme-modified starch or a heat-modified starch.
Preferably, the amylase inhibitor in step S2 is one or a mixture of two or at least two of copper ion inhibitor, zinc ion inhibitor, lithium ion inhibitor, manganese ion inhibitor.
Preferably, the biocide in step S2 is an oxidizing biocide or a non-oxidizing biocide.
Preferably, the biocide is an oxidizing biocide and the oxidizing biocide is one or a mixture of two or a mixture of at least two of monochloramine, chlorine dioxide, performic acid, peracetic acid, alkali and alkaline earth hypochlorites and N-hydrogen compounds in combination with an oxidizing agent.
Preferably, the nanocellulose in step S3 is prepared by the following steps:
s31: obtaining waste corrugated paper fibers, adding sodium bromide, a Tempo oxidant and sodium hypochlorite into the waste corrugated paper fibers, wherein the concentration of the waste corrugated paper fibers is 0.1-5%, the adding amount of the sodium bromide in each 1g of the waste corrugated paper fibers is 0.01-1 g, the adding amount of the Tempo oxidant in each 1g of the waste corrugated paper fibers is 0.01-1 g, the adding amount of the sodium hypochlorite is 25-100 ml, and the effective chlorine content of the sodium hypochlorite is 5-25%;
s32: placing the waste corrugated paper fibers treated in the step S31 under a stirrer for continuous stirring, wherein the stirring speed is 20-300 rpm;
s33: adding sodium hydroxide into the solution after stirring the S32 to adjust the PH of the solution, wherein the concentration of the sodium hydroxide is 0.1-1 mol/L, and the reaction time is 2-10 h;
s34: when the solution treated by the S33 is transparent and colorless, adding excessive absolute ethyl alcohol to terminate the reaction, wherein the adding amount of the absolute ethyl alcohol is 100-1000 ml;
s35: after the reaction is finished after S34 is finished, a large amount of distilled water is used for cleaning the slurry to be neutral, the slurry concentration is regulated for high-pressure homogenization, the high-pressure homogenization time is 5-30 min, and the high-pressure homogenization pressure is 10-200 MPa;
s36: and (3) carrying out suction filtration treatment on the nanocellulose after the high-pressure homogenization of S35.
Preferably, a cationic coagulant is added to the pulp stream after the S3 treatment for improving the retention of secondary starch on the fibers.
Preferably, the cationic coagulant has a charge density of not less than 2meq/g at pH 7.
Preferably, the cationic coagulant is bentonite or colloidal silica or a fixative.
Preferably, the fixing agent is one or two of polydiallyl dimethyl ammonium chloride, polyamine, polyvinyl amine, cationic polyacrylamide, polyethylenimine, polyamide-epichlorohydrin, polyaluminum chloride, alum, and methacrylamidopropyl trimethyl ammonium chloride or a mixture of at least two.
In summary, the invention has the advantages that: the method comprises the steps of S1 obtaining a pulp flow of at least recycled fiber and secondary starch, S2 adding amylase inhibitor and biocide to the pulp flow, S3 enabling nanocellulose and secondary starch to interact to form agglomerates, and treating the secondary starch in the OCC pulping process, wherein the biocide effectively reduces the propagation of microorganisms and reduces the generation of new amylase, so that starch degradation is reduced or prevented, the amylase inhibitor can inhibit the formation of amylase and inactivate amylase substances, therefore, the amylase inhibitor and the biocide are used for preventing secondary starch degradation, agglomerates are formed through interaction of nanocellulose and the secondary starch, so that the retention of the secondary starch is improved, specifically, the nanocellulose absorbs the secondary starch with small ion-free characteristic particle size in the circulation to form enough agglomerates on the formed paper web, so that the paper forming strength of paper is increased, the amount of surface sizing starch is reduced, the amount of new starch to be added is greatly reduced, COD is reduced, the COD (chemical oxygen demand) is reduced, and the COD value of wastewater to be treated is reduced by at least 20% compared with wastewater to that before the wastewater is treated is formed, and the wastewater to be treated is at least reduced.
Detailed Description
A method for treating secondary starch in an OCC pulping process comprising the steps of:
s1: obtaining a pulp stream comprising an aqueous phase and at least recycled fibers and secondary starch dispersed in the aqueous phase;
s2: adding an amylase inhibitor and a biocide to the pulp stream obtained in S1, wherein: the mass ratio of the amylase inhibitor to the biocide is 1:1-100:1;
s3: adding nanocellulose prepared by homogenizing pulp fibers under high pressure into the pulp flow treated by S2, and enabling the nanocellulose and secondary starch to interact to form agglomerates, wherein: the mass fraction of the nanocellulose is 0-20%.
The method comprises the steps of S1 obtaining a pulp flow of at least recycled fiber and secondary starch, S2 adding amylase inhibitor and biocide to the pulp flow, S3 enabling nanocellulose and secondary starch to interact to form agglomerates, and treating the secondary starch in the OCC pulping process, wherein the biocide effectively reduces the propagation of microorganisms and reduces the generation of new amylase, so that starch degradation is reduced or prevented, the amylase inhibitor can inhibit the formation of amylase and inactivate amylase substances, therefore, the amylase inhibitor and the biocide are used for preventing secondary starch degradation, agglomerates are formed through interaction of nanocellulose and the secondary starch, so that the retention of the secondary starch is improved, specifically, the nanocellulose absorbs the secondary starch with small ion-free characteristic particle size in the circulation to form enough agglomerates on the formed paper web, so that the paper forming strength of paper is increased, the amount of surface sizing starch is reduced, the amount of new starch to be added is greatly reduced, COD is reduced, the COD (chemical oxygen demand) is reduced, and the COD value of wastewater to be treated is reduced by at least 20% compared with wastewater to that before the wastewater is treated is formed, and the wastewater to be treated is at least reduced.
Since the main source of the secondary starch is waste corrugated board, the secondary starch is low molecular weight starch and has no ionic property, the viscosity is required by teaching, and the starch is generally degraded to the required molecular weight, so the secondary starch in the step S1 can be oxidized starch or acid modified starch or enzyme modified starch or heat modified starch, the weight average molecular weight of oxidized starch is 200000 ～ 5000000g/mol, preferably 300000 ～ 4000000g/mol, and the weight average molecular weight of acid modified amylase modified starch is 20000 ～ 2000000g/mol, preferably 50000-200000 g/mol.
The amylase inhibitor is a substance for inhibiting amylase formation and inactivating amylase, and in step S2, the amylase inhibitor is one or two or at least two of copper ion inhibitor, zinc ion inhibitor, lithium ion inhibitor and manganese ion inhibitor, preferably copper ion inhibitor, specifically, copper ion source is inorganic or organic copper compound, preferably, copper ion source is selected from CuO and Cu 2 O、CuS、Cu 2 S、Cu(NO 3 ) 2 、CuCl、CuCl 2 、Cu 2 SO 3 、CuSO 4 、Cu 2 SO 3 、Cu 2 P 2 O 7 、CuSCN、Cu 2 (OH) 2 CO 3 、(CH 3 COO) 2 Cu、Cu(OH) 2 、CuI、CuBr 2 、Cu3(PO4)2、Cu(NO)2、Cu(OH) 2 In one embodiment of the invention, the concentration of copper ions is in the range of 1 to 1000ppm, in particular in the range of 10 to 500ppm, preferably 20 to 200ppm, wherein ppm refers to the weight of active compound per volume of slurry comprising solid matter, or copper ions in the range of 0.1 to 1000mg/L, in particular in the range of 2 to 800mg/L, preferably 50 to 100 mg/L.
The biocide is effective to reduce the proliferation of microorganisms and reduce the production of new amylase, thereby reducing or preventing the degradation of starch, the biocide in step S2 is an oxidizing biocide or a non-oxidizing biocide, the biocide is an oxidizing biocide, the concentration of the oxidizing biocide added is 0.1 to 1000mg/L, particularly 0.5 to 100mg/L, the concentration of the oxidizing biocide is preferably 0.7 to 50mg/L, or the concentration of the oxidizing biocide is preferably 0.1 to 100ppm, particularly 0.1 to 50ppm, the concentration of the oxidizing biocide is preferably 0.1 to 15ppm, and the oxidizing biocide is one or a mixture of two of monochloramine, chlorine dioxide, performic acid, peracetic acid, alkali and alkaline earth hypochlorites and N-hydrogen compounds combined with the oxidizer, or a mixture of at least two, the embodiment preferably adopts monochloramine.
The mass fraction of the nanocellulose in the present embodiment is preferably 0 to 15%, more preferably 0 to 5%, and the nanocellulose in step S3 is prepared by the following steps:
s31: obtaining waste corrugated paper fibers, adding sodium bromide, a Tempo oxidant and sodium hypochlorite into the waste corrugated paper fibers, wherein the concentration of the waste corrugated paper fibers is 0.1-5%, the concentration of the waste corrugated paper fibers in the embodiment is 0.1-2%, more preferably 0.1-1%, the adding amount of sodium bromide in each 1g of the waste corrugated paper fibers is 0.01-1 g, preferably 0.01-0.5 g, more preferably 0.01-0.1 g, the adding amount of the Tempo oxidant in each 1g of the waste corrugated paper fibers is 0.01-1 g, preferably 0.01-0.5 g, more preferably 0.01-0.1 g, the adding amount of sodium hypochlorite is 25-100 ml, preferably 50-100 ml, more preferably 50-75 ml, and the effective chlorine content of the sodium hypochlorite is 5-25%, preferably 5-15%, more preferably 10-15%;
s32: placing the waste corrugated paper fibers treated in the step S31 under a stirrer for continuous stirring, wherein the stirring speed is 20-300 rpm; the stirring speed is preferably 100 to 200rpm, more preferably 100 to 150rpm,
s33: adding sodium hydroxide into the solution after stirring the S32 to adjust the PH of the solution, wherein the concentration of the sodium hydroxide is 0.1-1 mol/L, and the reaction time is 2-10 h; the concentration of sodium hydroxide is preferably 0.1 to 0.5mol/L, more preferably 0.1 to 0.2mol/L, and the reaction time is preferably 2 to 5 hours, more preferably 4 to 5 hours;
s34: when the solution treated by the S33 is transparent and colorless, adding excessive absolute ethyl alcohol to terminate the reaction, wherein the adding amount of the absolute ethyl alcohol is 100-1000 ml; the amount of the absolute ethyl alcohol added is preferably 200 to 700ml, more preferably 300 to 500ml;
s35: after the reaction is finished after S34 is finished, a large amount of distilled water is used for cleaning the slurry to be neutral, the slurry concentration is regulated for high-pressure homogenization, the high-pressure homogenization time is 5-30 min, and the high-pressure homogenization pressure is 10-200 MPa; the time of high-pressure homogenization is preferably 10-15 min, and the pressure of high-pressure homogenization is preferably 50-100 Mpa;
s36: and (3) carrying out suction filtration treatment on the nanocellulose after the high-pressure homogenization of S35.
The addition of a cationic coagulant to the pulp stream after the treatment of S3, which is bentonite or colloidal silica or a fixative, which is one or a mixture of two of polydiallyl dimethyl ammonium chloride, polyamine, polyvinylamine, cationic polyacrylamide, polyethylenimine, polyamide-epichlorohydrin, polyaluminum chloride, alum, methacrylamidopropyl trimethyl ammonium chloride or a mixture of at least two of them, in this example, is preferred for the coagulant, is used not only to improve the retention of the secondary starch on the fibers, but also to significantly improve the physical properties of the corrugated base paper, so that agglomerates formed by the secondary starch bound to the nanocellulose can remain on the fibers after the nanocellulose has been added, at a pH equal to 7.
Finally, amylase inhibitors, biocides and nanocellulose may be added to the secondary starch-containing and microorganism-containing locations, may be added to the broke system, pulp storage tank, water entering the pulper, or the line before the pulper, water storage tank or broke or pulp storage tank, in particular, the method according to the invention may be used in the pulping and/or broke system of recycled fibers containing secondary starch; the amylase inhibitor, biocide and nanocellulose may be added directly to the pulp stream, or may be added first to the aqueous process stream, later combined with the pulp stream, or the amylase inhibitor, biocide and nanocellulose may be added to the pulp stream and one or more aqueous process streams; the amylase inhibitor and biocide and nanocellulose may be added to the pulp or process stream simultaneously or sequentially; in one embodiment of the invention, the amylase inhibitor and biocide are added prior to the addition of nanocellulose; the addition of amylase inhibitors and biocides is preferred because it minimizes further degradation of the secondary starch and can improve the setting of the secondary starch and thus the retention of the secondary starch to the recycled fiber; according to one embodiment of the invention, the at least one coagulant is added simultaneously with the nanocellulose or after the nanocellulose is added to the pulp stream or process stream.
Example 1
Adding starch into the collected slurry from the headbox in the OCC corrugated board production line to culture microorganisms, gelatinizing the added starch at 90 ℃ for 30min, wherein the solid content of the starch is 4%, and the starch adding amount is 10ml of starch added per 1L of slurry; placing the slurry added with the starch in a shaking table at 45 ℃ and 200rpm for culturing for 16 hours so as to induce the breeding of microorganisms; and taking out the slurry after the culture is finished, placing the slurry in a suction filter for suction filtration, and adding the prepared secondary starch into the filtrate to simulate the starch environment of OCC.
The secondary starch is starch obtained by coating the starch after enzymolysis on tinfoil and scraping the starch, the sizing process of paper is simulated, 10% of solid starch is placed in a 500ml three-mouth flask, the mixture is stirred in a water bath kettle at 45 ℃ for 5min, the stirring speed is 300rpm, after the mixture is stirred for 5min, solid amylase with the starch content of 0.02% is added, the stirring is continued for 5min, after the stirring is completed, the water bath kettle is regulated to be heated to 90 ℃ and the temperature is kept for 30min, the prepared enzymolysis starch is uniformly coated on the surface of the tinfoil by using a coater, the mixture is dried in an oven at 105 ℃ for 5min, and the obtained product is taken out and scraped by a scraper to obtain the secondary starch.
The secondary starch was treated with copper ion inhibitor and monochloramine, and no anything was added to the secondary starch, and the secondary starch was tested, the test results are shown in table one:
Figure BDA0003538421520000091
list one
It can be seen from Table one that when nothing is added, the starch is degraded 83.3% at 4 hours and 97.6% after 24 hours, and after copper ion inhibitor and monochloramine are added, part of the starch is prevented from being degraded after 4 hours, but after 24 hours, the starch degradation preventing ability is almost not high, and when the ion inhibitor and monochloramine are used together, a better effect than that obtained by using the ion inhibitor and monochloramine alone is obtained.
Embodiment two:
the simulation of the OCC environment was carried out using the method of example 1, the filtrate obtained was taken out and centrifuged at 10000rpm for 5min, the supernatant after centrifugation was taken out, secondary starch was added and incubated in a shaker for 2h, the secondary starch preparation was identical to example 1, the secondary starch content was 4% and incubated in a water bath at 90℃for 30min before addition, the shaker temperature was 45℃at 150rpm, and the starch addition was 10ml per 500 ml.
The retention of secondary starch on paper was measured using DDA (dynamic drainage analyzer), the time of adding cationic polyacrylamide and nanocellulose prepared from waste paper board to the pulp was indicated as negative time before starting drainage, the volume of slurry in DDA was 500ml, the stirring speed of DDA was 2000rpm, stirring was stopped 5 seconds before drainage, vacuum was 600mbar after drainage started, for 35 seconds, and wire opening was 0.25mm.
The secondary starch content was determined from the DDA filtrate sample and converted to the secondary starch content remaining on the paper, 10ml of filtrate was taken and added with 0.3ml of iodine-potassium iodide reagent, absorbance was measured at 540nm, filtrate secondary starch concentration was obtained according to standard curve, and the secondary starch content measurement method in slurry was consistent with the above, and starch retention was calculated by using equation (pulp starch-filtrate starch)/pulp starch×100%.
In addition, the filtrate turbidity was measured immediately by a turbidity meter using the ISO 7027 method, and the calculation results are shown in table two:
Figure BDA0003538421520000101
Figure BDA0003538421520000111
watch II
From Table II, it can be seen that nanocellulose and copper ions and chloramine T The addition of (a) reduces the turbidity of the filtrate and increases the retention of starch, further improvements are achieved by the addition of coagulants which improve drainage time, turbidity and starch retention.
The above embodiments are merely illustrative embodiments of the present invention, but the technical features of the present invention are not limited thereto, and any changes or modifications made by those skilled in the art within the scope of the present invention are included in the scope of the present invention.

Claims (1)

1. A method for treating secondary starch in an OCC pulping process, comprising: the method comprises the following steps:
s1: obtaining a pulp stream comprising an aqueous phase and at least recycled fibers and secondary starch dispersed in the aqueous phase;
s2: adding an amylase inhibitor and a biocide to the pulp stream obtained in S1, wherein: the mass ratio of the amylase inhibitor to the biocide is 1:1-100:1;
s3: adding nanocellulose prepared by homogenizing pulp fibers under high pressure into the pulp flow treated by S2, and enabling the nanocellulose and secondary starch to interact to form agglomerates, wherein: the mass fraction of the nanocellulose is 0% -20%;
adding a cationic coagulant to the pulp stream after the S3 treatment for improving retention of secondary starch on the fibers;
the cationic coagulant has a charge density of not less than 2meq/g at pH 7;
the cationic coagulant is cationic polyacrylamide;
wherein the amylase inhibitor in the step S2 is a copper ion inhibitor, and the biocide is monochloramine;
the addition amount of the copper ion inhibitor is 25ml, the addition amount of the monochloramine biocide is 50ml, the addition amount of the cationic polyacrylamide is 0.8kg/t, and the addition amount of the nanocellulose is 0.5kg/t;
the nanocellulose in step S3 is prepared by the following steps:
s31: obtaining waste corrugated paper fibers, adding sodium bromide, a Tempo oxidant and sodium hypochlorite into the waste corrugated paper fibers, wherein the concentration of the waste corrugated paper fibers is 0.1-5%, the adding amount of the sodium bromide in each 1g of the waste corrugated paper fibers is 0.01-1 g, the adding amount of the Tempo oxidant in each 1g of the waste corrugated paper fibers is 0.01-1 g, the adding amount of the sodium hypochlorite is 25-100 ml, and the effective chlorine content of the sodium hypochlorite is 5-25%;
s32: placing the waste corrugated paper fibers treated in the step S31 under a stirrer for continuous stirring, wherein the stirring speed is 20-300 rpm;
s33: adding sodium hydroxide into the solution after stirring the S32 to adjust the pH of the solution, wherein the concentration of the sodium hydroxide is 0.1-1 mol/L, and the reaction time is 2-10 h;
s34: when the solution treated by the S33 is transparent and colorless, adding excessive absolute ethyl alcohol to terminate the reaction, wherein the adding amount of the absolute ethyl alcohol is 100-1000 ml;
s35: after the reaction is finished after S34 is finished, a large amount of distilled water is used for cleaning the slurry to be neutral, the slurry concentration is regulated for high-pressure homogenization, the high-pressure homogenization time is 5-30 min, and the high-pressure homogenization pressure is 10-200 MPa;
s36: and (3) carrying out suction filtration treatment on the nanocellulose after the high-pressure homogenization of S35.
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