CN103061181A - Complex enzyme preparation and technique for preparing dissolving pulp by using same - Google Patents
Complex enzyme preparation and technique for preparing dissolving pulp by using same Download PDFInfo
- Publication number
- CN103061181A CN103061181A CN2012105945963A CN201210594596A CN103061181A CN 103061181 A CN103061181 A CN 103061181A CN 2012105945963 A CN2012105945963 A CN 2012105945963A CN 201210594596 A CN201210594596 A CN 201210594596A CN 103061181 A CN103061181 A CN 103061181A
- Authority
- CN
- China
- Prior art keywords
- complex enzyme
- slurry
- enzyme formulation
- dissolving pulp
- enzyme preparation
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Images
Landscapes
- Paper (AREA)
Abstract
The invention relates to the technical field of production of regenerated cellulose fiber, in particular discloses a complex enzyme preparation applied in the preparation of dissolving pulp and a technique for preparing the dissolving pulp by using the enzyme preparation. The complex enzyme preparation is divided into a complex enzyme preparation I and a complex enzyme preparation II, wherein the complex enzyme preparation I mainly consists of feruloyl esterase, lipase and the like; and the complex enzyme preparation II mainly consists of xylanase, cellulase and the like. The complex enzyme preparation is applied in the technique for purifying alpha-cellulose and preparing the dissolving pulp; and the technique comprises the following steps of impurity removal for raw materials, enzyme method pretreatment, enzymolysis pulping, chelation treatment, alkali hydroxyl active oxygen cooking, acid treatment, washing, sand removal and pulp mixing. The method has the simple preparation technique, and adopts the complex enzyme preparation to treat the raw material pulp so as to effectively remove lignin, hemicellulose, pectin substance and waxiness and to reduce the degree of polymerization of the alpha-cellulose; the energy consumption is low under the normal pressure condition; the COD (Chemical Oxygen Demand) value of the pulping waste water is low; the yield of the dissolving pulp is high; the alpha-cellulose has high content and uniform degree of polymerization; and the production requirements of viscose can be satisfied.
Description
Technical field:
The invention belongs to regenerated celulose fibre manufacturing technology field, the invention discloses a kind of complex enzyme formulation and utilize this enzyme preparation purifying alpha-cellulose with the technique of preparation dissolving pulp.
Background technology:
Dissolving pulp can be for the production of products such as viscose, cellulose acetate, celluloid, carboxymethyl celluloses by chemical modification.This " special slurry " is the important source material of cellulose derivative product.Present most dissolving pulp is by improving the productions of sulfate process and sulphite process, and its target is in order to obtain highly purified cellulose, and has lost the part cellulose by chemical modification, reduces yield, has improved production cost.Cotton and needlebush are the main raw materials that dissolving pulp is produced, and also have part to use the leaf wood raw material, along with the development and utilization of bamboo fibre, utilize bamboo to remove its lignin, hemicellulose, produce the source that high pure cellulose also becomes dissolving pulp.
Because China produces cotton big country, and the timber fractional yield is lower, so in China's dissolving pulp production field, mainly prepares dissolving pulp as main take cotton linter.Its traditional pulping process comprises out bag, dedusting, boiling, washes the steps such as material, making beating, desanding, bleaching, papermaking.Wherein the cotton linter boiling will through feeding intake, once intensifications, once little steam bleeding, secondary temperature elevation, the little steam bleeding of secondary, three times heat up, insulation, greatly steam bleeding, add warm water, these several programs of batch turning.Boiling reaches the purpose of intensification and cellulose depolymerization by passing into high alkali liquid 17.5-18% and 160-175 ℃ high-temperature water vapor in the rotary spherical digester, temperature and gauge pressure that the method for the little steam bleeding in employing intensification limit, limit requires when realizing insulation.Cotton linter by saponification and emulsification, is removed the impurity such as grease, wax, gray iron at holding stage during boiling, improves the relative amount of alpha-cellulose, fully destroys the primary wall of cotton fiber, reduces the cellulosic degree of polymerization, improves the reactivity worth of dissolving pulp.Pulp fiber length through boiling is still large at 6-10mm and intensity, and beating energy consumption is high.The bleaching of traditional handicraft adopts chlorine to float, and its process comprises pre-acid, chlorination, bleaching, dechlorination, acid treatment, washing, complex procedures, " plain boiled water " pH that produces low and contain a large amount of chlorine elements, increased the sewage disposal difficulty.
Produce a large amount of black liquor in the traditional handicraft digestion process, its COD is up to 10 * 10
4Mg/L, residual alkali 10-15mg/L, mainly comprise lignin, hemicellulose, organic acid and a large amount of black organic matter, and because it is low to make in the sewage that raw material produces the solid content calorific value with cotton linter, be not suitable for having brought great inconvenience with the method that concentrated, burning, alkali reclaim to its processing, also brought very big pollution to environment.High Temperature High Pressure is adopted in simultaneously boiling, and the consumption of steam energy consumption is large.
In sum, traditional pulp-making of cotton linter industry is a high water consumption, highly energy-consuming, high pollution, high consumption alkali " four height " industry.Along with the gradually raising of environmental requirement, only have traditional THE TECHNICS IN PULPMAKING OF COTTON LINTER of improvement, reduce energy consumption, reduce and pollute, reduce chemicals consumption pulping and paper-making industry and could survival and development go down.
Summary of the invention
For the problems referred to above, the present invention proposes a kind of technique that is applied to the complex enzyme formulation of dissolving pulp preparation and uses this enzyme preparation dissolving pulp, this complex enzyme formulation is divided into complex enzyme formulation I and complex enzyme formulation II; The complex enzyme formulation I mainly is comprised of feruloyl esterase and lipase etc.; The complex enzyme formulation II mainly is comprised of zytase, cellulase etc.The technique that this complex enzyme formulation is applied to the purifying alpha-cellulose and prepares dissolving pulp comprises the steps: that impurity removing, enzyme process preliminary treatment, enzymolysis making beating, chelation treatment, the boiling of alkaline hydroxyl activity oxygen, acid treatment, washing, desanding, papermaking can finish.Method preparation technology of the present invention is simple, processing former slip by complex enzyme formulation can effectively remove lignin, hemicellulose, pectic substance and wax, reduce simultaneously the degree of polymerization of alpha-cellulose, and the method is the biochemical pulping process that biological enzyme is combined with chemical method, make the required temperature conditions of alpha-cellulose purifying and depolymerization from 170 ℃ of traditional alkaline boiling, be reduced to 80-130 ℃, greatly reduced reaction condition and energy consumption; And chemicals NaOH consumption is down to 5-15% so that pulp-making waste-water COD value is little from 17.5-18%, and the dissolving pulp yield is high, and alpha-cellulose content height and degree of polymerization homogeneous can satisfy the production requirement that dissolving pulp and viscose are used in weaving.
One of purpose of the present invention provides a kind of complex enzyme formulation for cellulose purification and dissolving pulp conversion, this complex enzyme formulation is divided into complex enzyme formulation I and complex enzyme formulation II, and wherein each constituent of complex enzyme formulation I and weight percent content are: feruloyl esterase 0.1-5%, lipase 1-10%, pectase 1-10%, laccase 1-5%, antioxidant 0.5-2%, mould inhibitor 0.5-2%, pest repellant 0.1-0.5%, all the other are carrier;
Described each constituent of complex enzyme formulation II and weight percent content are: zytase 1-10%, cellulase 1-10%, dextranase 1-10%, arabinase 1-10%, antioxidant 0.5-2%, mould inhibitor 0.5-2%, pest repellant 0.1-0.5%, all the other are carrier;
Described carrier is soluble starch or dextrin or its mixture.
Further the optimum ratio of inventor's acquisition is: the constituent of described complex enzyme formulation I and percentage by weight are: feruloyl esterase 0.2-2%, lipase 1-5%, pectase 1-5%, laccase 1-3%, antioxidant 0.5-1.5%, mould inhibitor 0.5-1.5%, pest repellant 0.1-0.3%, surplus are soluble starch;
Described complex enzyme formulation II constituent and percentage by weight are: zytase 1-5%, cellulase 1-5%, dextranase 1-5%, arabinase 1-5%, antioxidant 0.5-2%, mould inhibitor 0.5-2%, pest repellant 0.1-0.5%, surplus are soluble starch.
Wherein said antioxidant is: the mixture of one or more in Tea Polyphenols, ascorbic acid, the phytic acid;
Wherein said mould inhibitor is the polysaccharide adsorbent, can be one or both the mixture in trehalose, the pulullan polysaccharide etc.; Wherein said pest repellant is wherein a kind of of arprinocid, Amprolium Hydrochloride;
Contain feruloyl esterase in the complex enzyme formulation I of the present invention, can break the compact texture that forulic acid is connected with cellulose, hemicellulose, lignin, interrupt the ester bond in the plant cell, so that cotton linter short texture, expose the site of other enzyme effects, strengthen the action effect of other enzyme, be beneficial to simultaneously soaking into of liquid; Lipase in the complex enzyme formulation I, pectase can reduce fat, pectic substance content in the Cotton Pulp, reduce the hydrophobicity of cotton linter, so that chemicals is more prone to infiltration, and have reduced the consumption of NaOH consumption at fat, pectin.
Complex enzyme formulation II of the present invention contains hemicellulase (zytase, arabinase), cellulase, and hemicellulose in the hemicellulose enzyme hydrolysis cotton linter reduces its hemicellulose level; Endoglucanase in the cellulase, exoglucanase, beta-glucosidase degraded cellulose and reduce its fibre crystallinity under the three coordinates mutually.Two kinds of enzymes are used has obtained splendid effect.
Another object of the present invention provides a kind ofly uses above-mentioned complex enzyme formulation in the technical scheme of dissolving pulp preparation process, namely utilize complex enzyme formulation to prepare the method for dissolving pulp, the method is the biochemical pulping process that utilizes biological enzyme to be combined with chemical method, mainly comprises the steps:
(1) impurity removing: cotton linter is sent into cyclone separator remove impurity in the cotton linter;
(2) enzyme process preliminary treatment: adopting screw press is 5-15%(w/v with cotton linter according to slurry concentration) add water and mixing, the pH of material is adjusted between the 5.5-6.5; Described complex enzyme formulation I is added in the slurry, and addition is the 0.1-5% of over dry material gross weight, processes 4-48h under 35-60 ℃ of condition;
(3) enzymolysis making beating removal of impurities: adjust between the material pH to 4-6 after the above-mentioned processing, described complex enzyme formulation II is added in the above-mentioned slurry, addition is the 0.1-5% of over dry material gross weight, processes 4-48h under 35-60 ℃ of condition; Running water is adjusted slurry concentration to 3-3.5%(w/v), discongest 20-60min under the 20-50 ℃ of condition, adopt the beater making beating; The making beating disposed slurry carries out the recleaning desanding, in dense desander to advance to starch concentration be 1.5-2%(w/v), advancing to starch pressure is 0.2-0.3MPa, enters afterwards low dense desander, concentration is 0.6-0.8%(w/v), pressure is 0.25-0.35MPa;
(4) chelation treatment: the slurry after the making beating removal of impurities is according to total liquor ratio 1:8-12(w/v) interpolation water, add simultaneously chelating agent EDTA, consumption is the 0.2-0.8%(w/w of relative over dry material gross weight), mixing is also regulated slurry pH between 3-9, the 50-80 ℃ of lower 30-90min that processes;
(5) alkaline hydroxyl activity oxygen digestion process: the running water filtering stock is neutral to pH after the chelation treatment, adjusts slurry concentration at 40-60%(w/v) the rear input in the rotary spherical digester; NaOH is according to the 9-15%(w/w of relative over dry material gross weight) be made into the high alkali liquid of 50-100g/L, MgSO
40.1-0.5%(w/w according to relative over dry material gross weight) is made into solution, the H of 10-50g/L
2O
21-9%(w/w according to relative over dry material gross weight) add in the rotary spherical digester successively, and according to total liquor ratio 1:3-12(w/v) add running water; Seal rotary 5-10min is so that slurry and chemical liquid mix; Then temperature is risen to 80-130 ℃ lentamente, be incubated 60-150min after reaching temperature; Slurry was emitted in the steam bleeding cooling afterwards after boiling was finished, and running water washs to pH neutral;
(6) acid treatment: the slurry that the upper step was obtained mixes according to total liquor ratio 1:7-15 with water, adds 70-100g/L hydrochloric acid 2-6%(w/v), mixing, at the 50-90 ℃ of lower 30-90min that processes, running water washs to pH neutral;
(7) wash, make the dregs of rice: the slurry after the washing is regulated the dense 0.2-1%(w/v of slurry), enter hydrocyclone, pressure is 274-350kPa, outlet pressure is 0-20kPa; Enter pulp machine after the washing and make the dregs of rice.
The more concrete technology treatment step of biochemical legal system dissolving pulp of the present invention is as follows:
(1) impurity removing: cotton linter is opened bag, it is sent into cyclone separator, because cotton fiber and impurity weight differ larger, large dust impurity falls into the bottom cotton fiber and the parts of fine small impurities is then sent into spiral pressure bundle machine together with the wind, by the cyclonic separation Impurity removals such as boll hull that the overwhelming majority is large, can effectively improve the pretreated efficient of next step biology enzyme;
(2) enzyme process preliminary treatment: the concentration of adjusting former slip is 5-15%(w/v), the pH of material is adjusted between the 5.5-6.5; Described complex enzyme formulation I is added in the slurry, and addition is the 0.1-5% of over dry material gross weight, processes 4-48h under 35-60 ℃ of condition;
Lipase was removed fatty 40-80wt% in the cotton fiber after enzyme was processed, and pectase is removed pectic substance 40-80wt% in the cotton linter; Show that by electron microscopic observation the cotton fiber primary cell wall is evenly destroyed by feruloyl esterase, the microfibre of part S1 layer is destructurized;
(3) enzymolysis making beating removal of impurities: adjust between the material pH to 4-6, described complex enzyme formulation II is added in the above-mentioned slurry, addition is over dry material gross weight 0.1-5%, processes 4-48h under 35-60 ℃ of condition; Running water is adjusted slurry concentration 3-3.5%(w/v), discongest 20-60min under the 20-50 ℃ of condition, adopt the beater making beating; The making beating disposed slurry carries out the recleaning desanding, in dense desander to advance to starch concentration be 1.5-2%(w/v), advancing to starch pressure is 0.2-0.3MPa, enters afterwards low dense desander, concentration is 0.6-0.8%(w/v), pressure is 0.25-0.35MPa;
Fibre length is shortened by original 10-13mm and is 1-3mm; Behind the enzymolysis fiber shorten, strength decreased so that beating energy consumption reduces 40-80%; Adopt selected desanding device, remove percentage of admixture and reach 30-70%, thereby reduced NaOH, the H of alkaline hydroxyl activity oxygen digestion process
2O
2Consumption, reduced cost and to the pollution of environment;
(4) chelation treatment: the slurry after the making beating removal of impurities is according to total liquor ratio 1:8-12(w/v) interpolation water, add simultaneously chelating agent EDTA, consumption is the 0.2-0.8%(w/w of relative over dry material gross weight), mixing is also regulated slurry pH between 3-9, the 50-80 ℃ of lower 30-90min that processes;
Owing to need in the lower step hydrogen peroxide used extremely unstable, adopt chelating agent preliminary treatment slurry in all these steps, remove the most transition metal ionss in the slurry, the decomposition of hydrogen peroxide when reducing alkaline hydroxyl activity oxygen boiling; Alkaline hydroxyl activity oxygen boiling disposed slurry whiteness improves 30-60% with comparing without the slurry of chelation treatment after the chelation treatment;
(5) alkaline hydroxyl activity oxygen atmospheric cooking process: the running water filtering stock is neutral to pH after the chelation treatment, adjusts slurry concentration at 40-60%(w/v) the rear input in the rotary spherical digester; NaOH is according to the 9-15%(w/w of relative over dry material gross weight) be made into the high alkali liquid of 50-100g/L, MgSO
40.1-0.5%(w/w according to relative over dry material gross weight) is made into solution, the H of 10-50g/L
2O
21-9%(w/w according to relative over dry material gross weight) add in the rotary spherical digester successively, and according to total liquor ratio 1:3-12(w/v) add running water; Seal rotary 5-10min is so that slurry and chemical liquid mix; Then temperature is risen to 80-130 ℃ lentamente, be incubated 60-150min after reaching temperature; Slurry was emitted in the steam bleeding cooling afterwards after boiling was finished, and running water washs to pH neutral;
Hydrogen peroxide easily decomposes under the high-temperature alkaline condition, generates hydroxyl radical free radical and active oxygen radical, and reaction equation is as follows:
Wherein the Hydroxyl radical HO oxidizing potential is 2.8V, is the oxidant that occurring in nature is only second to fluorine.Its character is active, can the rapid permeability oxidized fibre, reduce the fiber degree of polymerization; And hydrogen is crossed oxygen anion HOO
-The tool nucleation can make it to become colourless group effectively in conjunction with the chromophoric group structure in the lignin, and dissolved lignin to a certain extent;
Alkalescence hydroxyl activity oxygen atmospheric cooking disposed slurry alpha-cellulose content 95-96%, the degree of polymerization 500 ± 20, ash content (725 ℃) 0.18-0.25%, iron content 25-35mg/Kg; Adopt alkaline hydroxyl activity oxygen atmospheric cooking, the hydrogen that its digestion process produces is crossed oxygen anion can be effectively in conjunction with the chromophoric group structure in the lignin, make it to become colourless group, and dissolved lignin to a certain extent, so that pulp brightness reaches 85-90%, a step pulping, reduce the traditional handicraft bleachery, stop chlorine and float, shortened technological process, avoided the pollution of chlorine to environment; The more traditional black liquor of Colority of Sewage Water of simultaneously boiling gained hangs down 100-1000 doubly and is yellow, COD
CrValue is at 6000-17000mg/L, far below traditional black liquor; Simultaneously this technique boiling temperature is at 80-130 ℃, atmospheric cooking, and tradition is 170 ℃, and boiling under the 0.7Mpa condition reduces energy consumption 30-50%.
(6) acid treatment: the slurry that the upper step was obtained mixes according to total liquor ratio 1:7-15 with water, adds 70-100g/L hydrochloric acid 2-6%(w/v), mixing, at the 50-90 ℃ of lower 30-90min that processes, running water washs to pH neutral;
(7) wash, make the dregs of rice: the slurry after the washing is regulated the dense 0.2-1%(w/v of slurry), enter hydrocyclone, pressure is 274-350kPa, outlet pressure is 0-20kPa; Enter pulp machine after the washing and make the dregs of rice.
Conventional dose of the prior art is all adopted in the operation of the adjusting pH that mentions in the above-mentioned technique, does not repeat them here.
Through the dissolving pulp alpha-cellulose content of this explained hereafter 〉=95.0%, ash content (725 ℃)≤0.10%, iron content≤20mg/Kg, whiteness 〉=88% is inhaled base number 〉=500%, reactivity worth≤100s.According to standard FZ51001-2009, meet and be better than short rayon fiber Wesy pulp Grade A standard through the dissolving pulp of this explained hereafter.
The above-mentioned method of utilizing complex enzyme formulation to produce dissolving pulp, the optimum condition of each process is:
(1) impurity removing: cotton linter is opened bag, enter cyclone separator and remove impurity larger in the cotton linter;
(2) enzyme preliminary treatment: adopting screw press is 5-15%(w/v with cotton linter according to slurry concentration) interpolation water and mixing; The pH of material adjusts between the 5.5-6.5; Described complex enzyme formulation I is added in the slurry, and addition is the 0.2-0.5% of over dry material gross weight, processes 12-48h under 45-55 ℃ of condition, removes hemicellulose, lignin, wax and pectic substance in the slurry;
(3) enzymolysis making beating removal of impurities: adjust between the material pH to 4-6, described complex enzyme formulation II is added in the above-mentioned slurry, addition is over dry material gross weight 0.1-0.5%, processes 12-48h under 45-55 ℃ of condition; Running water is adjusted slurry concentration 3-3.5%(w/v), discongest 20-60min under the 20-40 ℃ of condition, adopt a watt power beater making beating; The making beating disposed slurry carries out the recleaning desanding, in dense desander to advance to starch concentration be 1.5-2%(w/v), advancing to starch pressure is 0.2-0.3MPa, enters afterwards low dense desander, concentration is 0.6-0.8%(w/v), pressure is 0.25-0.35Mpa, edulcoration rate reaches 20-50%;
(4) chelation treatment: the slurry after the making beating removal of impurities is according to total liquor ratio 1:9-12(w/v) interpolation water, add simultaneously chelating agent EDTA, consumption is the 0.2-0.6%(w/w of relative over dry material gross weight), mixing is also regulated slurry pH between 3-7, the 60-80 ℃ of lower 60-90min that processes, the running water washing is to neutral;
(5) alkaline hydroxyl activity oxygen digestion process: above-mentioned slurry is adjusted slurry concentration and is dropped in the rotary spherical digester behind 40-60%; NaOH is according to the 9-15%(w/w of relative over dry material gross weight) be made into the high alkali liquid of 50-100g/L, MgSO
40.1-0.5%(w/w according to relative over dry material gross weight) is made into solution, the H of 10-50g/L
2O
21-9%(w/w according to relative over dry material gross weight) add in the rotary spherical digester successively, and according to total liquor ratio 1:3-8(w/v) add running water.Seal rotary 5-10min is so that slurry and chemicals mix.Then temperature is risen to 100-130 ℃ slowly, be incubated 90-150min after reaching temperature.Slurry was emitted in the steam bleeding cooling afterwards after boiling was finished, and running water washs to pH neutral;
(6) acid treatment: the slurry that the upper step was obtained mixes according to total liquor ratio 1:9-12 with water, adds 70-90g/L hydrochloric acid 3-6%(w/v), mixing, at the 60-90 ℃ of lower 40-70min that processes, running water washs to pH neutral;
(7) wash, make the dregs of rice: the slurry after the washing is regulated the dense 0.2-1% of slurry, enters hydrocyclone, and pressure is 274-350kPa, and outlet pressure is 0-20kPa.The washing disposed slurry is sent into pulp machine.
Under above-mentioned optimum condition, dissolving pulp yield 〉=85%, wherein alpha-cellulose content 〉=95.0%, ash content (725 ℃)≤0.08%, iron content≤15mg/Kg, whiteness 〉=88%, inhale base number 〉=500%, reactivity worth≤50s, the degree of polymerization 500 ± 20 is higher than the requirement of dissolving pulp Grade A weight.
The production technology raw material of above-mentioned dissolving pulp pulp is cotton linter.
Adopt above-mentioned process conditions to prepare dissolving pulp, have following outstanding advantage:
1, contains feruloyl esterase in the complex enzyme formulation I, can break the compact texture that forulic acid is connected with cellulose, hemicellulose, lignin, interrupt the ester bond in the plant cell, so that cotton linter short texture, expose the site of other enzyme effects, strengthen the action effect of other enzyme, be beneficial to simultaneously soaking into of liquid;
2, the lipase in the complex enzyme formulation I, pectase can reduce fat, pectic substance content in the Cotton Pulp, have effectively strengthened the chemical oxidation effect of liquid, improve the chemicals effective rate of utilization.
3, each enzyme interacting in the complex enzyme formulation II can reduce the degree of polymerization of pulp, and the fibre length of pulp is shortened, and improves beatability, and beating energy consumption reduces 40-80%;
4, adopt the boiling of alkaline hydroxyl activity oxygen, reaction temperature 100-130 ℃, mild condition is saved the high pressure-temperature condition, further reduces energy consumption;
The traditional handicraft sodium hydroxide concentration is about 17.5-18%, and this technique has reduced 25-50% than traditional handicraft, greatly reduces the consumption of chemicals; Traditional handicraft is at 160-175 ℃ of autoclaving 2.5h, and this technique boiling 60-150min under 90-130 ℃ of normal pressure reduces energy consumption 30-50%; Traditional handicraft boiling, bleaching are carried out in two steps, and adopt chlorine to float, and environmental pollution is larger; And this process using hydrogen peroxide reinforced alkaline boiling and bleaching one, shortened the step of producing, and its Colority of Sewage Water, residual alkali be all far below traditional handicraft, its COD is 10000-20000mg/L, reduce more than 60% than conventional method, greatly reduce the difficulty of sewage disposal.
5, the pulp yield that obtains of this technique is high, reaches more than 85%; Especially reactivity worth is higher than 95% less than 50s, alpha-cellulose content, and whiteness is higher than 88%, is higher than national dissolving pulp primes standard.
In sum, production technology of the present invention is simple, and production process can be carried out and the yield height continuously, the most important thing is that it has reduced the use amount of energy consumption and chemicals, so that the black liquor that produces is easy to process, thereby reduce the pollution of institute's black liquor that produces to environment, more do not had the white clay generation.
Figure of description
Fig. 1 tradition dissolving pulp preparation technology flow chart;
Fig. 2 process chart of the present invention.
The specific embodiment
Embodiment 1
A kind of complex enzyme formulation, be comprised of complex enzyme formulation I and complex enzyme formulation II, wherein each constituent of complex enzyme formulation I and mass percentage content are: feruloyl esterase 0.3%, lipase 1%, pectase 1%, laccase 1%, antioxidant 0.5%, mould inhibitor 0.5%, pest repellant 0.1%, all the other are soluble starch;
Each constituent of complex enzyme formulation II and mass percentage content are: zytase 5%, cellulase 2%, dextranase 3%, arabinase 4%, antioxidant 0.5%, mould inhibitor 0.5%, pest repellant 0.1%, all the other are soluble starch;
Use the dissolving pulp production technology of above-mentioned complex enzyme formulation, specifically comprise the steps:
Through preliminary artificial dedusting back cotton linter 6t, adjust slurry concentration to 10%, adjust the pH=6.5 of solution, add complex enzyme I agent processed 12kg, process 24h for 55 ℃.Adjusting material pH is 4, adds complex enzyme formulation II 12kg and process 12h under 40 ℃ of conditions.Running water is adjusted slurry concentration 3%(w/v afterwards), discongest 50min under 30 ℃, discongest finish after making beating; Adopt the recleaning desanding, in dense desander to advance to starch concentration be 2%, advancing to starch pressure is 0.2MPa, entering afterwards low dense desander concentration is 0.8%, pressure is 0.25Mpa.Add water by total liquor ratio 1:10 afterwards, add simultaneously chelating agent EDTA18kg, adjusting material pH is 3, at 60 ℃ of lower 70min that process.Adjusting slurry dense through the slurry washing of chelation treatment to the neutrality is 50%, drops into rotary spherical digester; 780kgNaOH is made into the high alkali liquid of 60g/L, 24KgMgSO
4Be made into 50g/L solution, 30%(w/w) H
2O
21.8t, add water according to total liquor ratio 1:7.3 afterwards, 100 ℃ of boiling 2h.
After above-mentioned slurry is washed with water to neutrality, add 90g/L hydrochloric acid 180m
3, and add water according to total liquor ratio 1:10, at 60 ℃ of lower 70min that process.Then washing is to neutral, and papermaking is made the dregs of rice.
Alpha cellulose after testing: 95.2%, ash content (725 ℃): 0.03%, iron content: 11.3mg/Kg, whiteness: 88%, reactivity worth 50s, the degree of polymerization 520.
Boiling density wastewater during 40t, 500 times of colourities, slightly yellow, COD
CrBe 7500mg/L, BOD
5Be 3200mg/L; The waste water that the steps such as enzyme processing, washing produce is 70t altogether, COD
CrBe 500mg/L, BOD5 is 198mg/L.
Embodiment 2
A kind of complex enzyme formulation, be comprised of complex enzyme formulation I and complex enzyme formulation II, wherein each constituent of complex enzyme formulation I and mass percentage content are: feruloyl esterase 0.5%, lipase 2%, pectase 1%, laccase 3%, antioxidant 2%, mould inhibitor 1.5%, pest repellant 0.3%, all the other are dextrin;
Each constituent of complex enzyme formulation II and mass percentage content are: zytase 4%, cellulase 1%, dextranase 2%, arabinase 1%, antioxidant 2%, mould inhibitor 2%, pest repellant 0.5%, all the other are soluble starch;
Use the dissolving pulp production technology of above-mentioned complex enzyme formulation, specifically comprise the steps:
The three class secondary cotton linter 6t after the preliminary artificial dedusting that learn from else's experience adjust slurry concentration to 8%, adjust the pH=5.5 of solution, add complex enzyme formulation I 24kg, process 24h for 50 ℃.Adjusting material pH is 6, adds complex enzyme formulation II 12kg and process 12h under 40 ℃ of conditions.Running water is adjusted slurry concentration 3%(w/v afterwards), discongest 50min under 30 ℃, discongest finish after making beating; Recleaning desanding after the making beating, in dense desander to advance to starch concentration be 2%, advancing to starch pressure is 0.2MPa, entering afterwards low dense desander concentration is 0.8%, pressure is 0.25Mpa.Chelating agent EDTA24kg is made into the solution of 100g/L and adds water by total liquor ratio 1:12, and adjusting material pH is 6, at 70 ℃ of lower 90min that process.
Adjusting slurry dense through the slurry washing of chelation treatment to the neutrality is 50%, drops into rotary spherical digester; 720kgNaOH is made into the high alkali liquid of 70g/L, 24KgMgSO
4Be made into 50g/L solution,, 30%H
2O
21.8t 1:6 adds water according to liquor ratio, 100 ℃ of boiling 1.5h.
After being washed with water to neutrality, add 80g/L hydrochloric acid 240m
3And add water according to total liquor ratio 1:10, at 70 ℃ of lower 60min that process.Then washing is to neutral, and papermaking is made the dregs of rice.
Above-mentioned slurry is alpha cellulose after testing: 95.0%, and ash content (725 ℃): 0.09%, iron content: 15mg/Kg, whiteness: 85%, reactivity worth 10s, the degree of polymerization 550.
Boiling density wastewater during 37t, 800 times of colourities, slightly yellow, COD
CrBe 11000mg/L, BOD
5Be 45280mg/L; The waste water that the steps such as enzyme processing, washing produce is 72t altogether, COD
Cr980mg/L, BOD5 are 422mg/L.
Embodiment 3
A kind of complex enzyme formulation, be comprised of complex enzyme formulation I and complex enzyme formulation II, wherein each constituent of complex enzyme formulation I and mass percentage content are: feruloyl esterase 2%, lipase 1%, pectase 5%, laccase 3%, antioxidant 1%, mould inhibitor 1%, pest repellant 0.2%, soluble starch 80%, dextrin 6.8%;
Each constituent of complex enzyme formulation II and mass percentage content are: zytase 3%, cellulase 5%, dextranase 5%, arabinase 1%, antioxidant 1%, mould inhibitor 1.5%, pest repellant 0.2%, all the other are soluble starch;
Use the dissolving pulp production technology of above-mentioned complex enzyme formulation, specifically comprise the steps:
The preliminary artificial three grades of cotton linter 6t of dedusting two classes that learn from else's experience adjust slurry concentration to 12%, adjust the pH=6.5 of solution, add complex enzyme formulation I 30kg, process 16h for 45 ℃.Adjusting material pH is 5, adds complex enzyme formulation II 24kg and process 12h under 50 ℃ of conditions.Running water is adjusted slurry concentration 3%(w/v afterwards), discongest 50min under 40 ℃, discongest finish after making beating; Recleaning desanding after the making beating, in dense desander to advance to starch concentration be 2%, advancing to starch pressure is 0.2MPa, entering afterwards low dense desander concentration is 0.8%, pressure is 0.25Mpa.
Chelating agent EDTA36kg is made into 100g/L solution and adds, and adds water at 80 ℃ of lower 60min of processing according to liquor ratio 1:10.
Adjusting slurry dense through the slurry washing of chelation treatment to the neutrality is 60%, drops into rotary spherical digester; 660kgNaOH is made into the high alkali liquid of 70g/L, 27kgMgSO
4Be made into 50g/L solution, 30%H
2O
21.4t add successively, add water according to total liquor ratio 1:5,130 ℃ of boiling 2.5h.
After above-mentioned slurry is washed with water to neutrality, add 60g/L hydrochloric acid 360m
3Be that 1:10 adds water according to total liquor ratio, at 80 ℃ of lower 40min that process.Then washing is to neutral, and papermaking is made the dregs of rice.Alpha cellulose after testing: 96.4%, ash content (725 ℃): 0.05%, iron content: 12mg/Kg, whiteness: 89%, reactivity worth 10s, the degree of polymerization 515.
Boiling density wastewater during 31t, 900 times of colourities, slightly yellow, COD
CrBe 12400mg/L, BOD
5Be 5118mg/L; The waste water that the steps such as enzyme processing, washing produce is 76t altogether, COD
CrBe 465mg/L, BOD5 is 199mg/L.
Embodiment 4
A kind of complex enzyme formulation, be comprised of complex enzyme formulation I and complex enzyme formulation II, wherein each constituent of complex enzyme formulation I and mass percentage content are: feruloyl esterase 0.9%, lipase 2%, pectase 4%, laccase 1%, antioxidant 1.5%, mould inhibitor 1.5%, pest repellant 0.3%, all the other are dextrin;
Each constituent of complex enzyme formulation II and mass percentage content are: zytase 4%, cellulase 5%, dextranase 5%, arabinase 3%, antioxidant 0.5%, mould inhibitor 1%, pest repellant 0.2%, all the other are dextrin;
Use the dissolving pulp production technology of above-mentioned complex enzyme formulation, specifically comprise the steps:
The preliminary artificial three grades of cotton linter 6t of dedusting two classes that learn from else's experience adjust slurry concentration to 6%, adjust the pH=6 of solution, add complex enzyme formulation I 12kg, process 12h for 45 ℃.Adjusting material pH is 5.5, adds complex enzyme formulation II 15kg and process 24h under 55 ℃ of conditions.Running water is adjusted slurry concentration 3%(w/v afterwards), discongest 50min under 40 ℃, discongest finish after making beating; Recleaning desanding after the making beating, in dense desander to advance to starch concentration be 2%, advancing to starch pressure is 0.2MPa, entering afterwards low dense desander concentration is 0.8%, pressure is 0.25Mpa.Then regulating material pH is 7, and chelating agent EDTA48kg is made into 100g/L solution and adds, and adds water according to liquor ratio 1:10, at 80 ℃ of lower 60min that process.
Adjusting slurry dense through the slurry washing of chelation treatment to the neutrality is 60%, drops into rotary spherical digester; 900kgNaOH is made into the high alkali liquid of 80g/L, 26kgMgSO
4Be made into 50g/L solution, 30%H
2O
20.4t add successively, add water according to total liquor ratio 1:3.4,110 ℃ of lower boiling 2h.
After above-mentioned slurry is washed with water to neutrality, add 70g/L hydrochloric acid 180m
3Be that 1:12 adds water according to total liquor ratio, at 90 ℃ of lower 40min that process.Then washing is to neutral, and papermaking is made the dregs of rice.
Alpha cellulose after testing: 94.8%, ash content (725 ℃): 0.07%, iron content: 18mg/Kg, whiteness: 87%, reactivity worth 7s, the degree of polymerization 489.
Boiling density wastewater during 20t, 1000 times of colourities, slightly yellow, COD
CrBe 13200mg/L, BOD
5Be 5500mg/L; The waste water that the steps such as enzyme processing, washing produce is 75t altogether, COD
CrBe 650mg/L, BOD5 is 265mg/L.
Claims (6)
1. complex enzyme formulation, be comprised of complex enzyme formulation I and complex enzyme formulation II, it is characterized in that: described each constituent of complex enzyme formulation I and weight percent content are: feruloyl esterase 0.1-5%, lipase 1-10%, pectase 1-10%, laccase 1-5%, antioxidant 0.5-2%, mould inhibitor 0.5-2%, pest repellant 0.1-0.5%, all the other are carrier;
Described each constituent of complex enzyme formulation II and weight percent content are: zytase 1-10%, cellulase 1-10%, dextranase 1-10%, arabinase 1-10%, antioxidant 0.5-2%, mould inhibitor 0.5-2%, pest repellant 0.1-0.5%, all the other are carrier;
Described carrier is soluble starch or dextrin or its mixture.
2. complex enzyme formulation as claimed in claim 1, it is characterized in that: the constituent of described complex enzyme formulation I and percentage by weight are: feruloyl esterase 0.2-2%, lipase 1-5%, pectase 1-5%, laccase 1-3%, antioxidant 0.5-1.5%, mould inhibitor 0.5-1.5%, pest repellant 0.1-0.3%, surplus are soluble starch;
Described complex enzyme formulation II constituent and percentage by weight are: zytase 1-5%, cellulase 1-5%, dextranase 1-5%, arabinase 1-5%, antioxidant 0.5-2%, mould inhibitor 0.5-2%, pest repellant 0.1-0.5%, surplus are soluble starch.
According to claim 1 with complex enzyme formulation claimed in claim 2, it is characterized in that: described mould inhibitor is the polysaccharide adsorbent; Described antioxidant is one or more the mixture in Tea Polyphenols, ascorbic acid, the phytic acid; Described pest repellant is arprinocid or Amprolium Hydrochloride.
4. application rights requires the dissolving pulp production technology of 1 described complex enzyme formulation, it is characterized in that: specifically comprise the steps:
(1) impurity removing: cotton linter is sent into cyclone separator remove impurity in the cotton linter;
(2) enzyme process preliminary treatment: adopting screw press is 5-15%(w/v with cotton linter according to slurry concentration) add water and mixing, the pH of material is adjusted between the 5.5-6.5; Described complex enzyme formulation I is added in the slurry, and addition is the 0.1-5% of over dry material gross weight, processes 4-48h under 35-60 ℃ of condition;
(3) enzymolysis making beating removal of impurities: adjust between the material pH to 4-6 after the above-mentioned processing, described complex enzyme formulation II is added in the above-mentioned slurry, addition is the 0.1-5% of over dry material gross weight, processes 4-48h under 35-60 ℃ of condition; Running water is adjusted slurry concentration to 3-3.5%(w/v), discongest 20-60min under the 20-50 ℃ of condition, adopt the beater making beating; The making beating disposed slurry carries out the recleaning desanding, in dense desander to advance to starch concentration be 1.5-2%(w/v), advancing to starch pressure is 0.2-0.3MPa, enters afterwards low dense desander, concentration is 0.6-0.8%(w/v), pressure is 0.25-0.35MPa;
(4) chelation treatment: the slurry after the making beating removal of impurities is according to total liquor ratio 1:8-12(w/v) interpolation water, add simultaneously chelating agent EDTA, consumption is the 0.2-0.8%(w/w of relative over dry material gross weight), mixing is also regulated slurry pH between 3-9, the 50-80 ℃ of lower 30-90min that processes;
(5) alkaline hydroxyl activity oxygen digestion process: the running water filtering stock is neutral to pH after the chelation treatment, adjusts slurry concentration at 40-60%(w/v) the rear input in the rotary spherical digester; NaOH is according to the 9-15%(w/w of relative over dry material gross weight) be made into the high alkali liquid of 50-100g/L, MgSO
40.1-0.5%(w/w according to relative over dry material gross weight) is made into solution, the H of 10-50g/L
2O
21-9%(w/w according to relative over dry material gross weight) add in the rotary spherical digester successively, and according to total liquor ratio 1:3-12(w/v) add running water; Seal rotary 5-10min is so that slurry and chemical liquid mix; Then temperature is risen to 80-130 ℃ lentamente, be incubated 60-150min after reaching temperature; Slurry was emitted in the steam bleeding cooling afterwards after boiling was finished, and running water washs to pH neutral;
(6) acid treatment: the slurry that the upper step was obtained mixes according to total liquor ratio 1:7-15 with water, adds 70-100g/L hydrochloric acid 2-6%(w/v), mixing, at the 50-90 ℃ of lower 30-90min that processes, running water washs to pH neutral;
(7) wash, make the dregs of rice: the slurry after the washing is regulated the dense 0.2-1%(w/v of slurry), enter hydrocyclone, pressure is 274-350kPa, outlet pressure is 0-20kPa; Enter pulp machine after the washing and make the dregs of rice.
5. complex enzyme formulation according to claim 4 is applied to the production technology of dissolving pulp, it is characterized in that: the production technology raw material of described dissolving pulp pulp is cotton linter.
6. complex enzyme formulation according to claim 4 is applied to the production technology of dissolving pulp, it is characterized in that: the final dissolving pulp yield that obtains 〉=85%, alpha-cellulose 〉=95.0%, whiteness 〉=88%, reactivity worth≤50s.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210594596.3A CN103061181B (en) | 2012-12-31 | 2012-12-31 | Complex enzyme preparation and technique for preparing dissolving pulp by using same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210594596.3A CN103061181B (en) | 2012-12-31 | 2012-12-31 | Complex enzyme preparation and technique for preparing dissolving pulp by using same |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103061181A true CN103061181A (en) | 2013-04-24 |
| CN103061181B CN103061181B (en) | 2014-10-22 |
Family
ID=48104053
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210594596.3A Active CN103061181B (en) | 2012-12-31 | 2012-12-31 | Complex enzyme preparation and technique for preparing dissolving pulp by using same |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103061181B (en) |
Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104109978A (en) * | 2014-06-24 | 2014-10-22 | 黄河三角洲京博化工研究院有限公司 | Method for preparing cotton linter dissolving pulp |
| CN105019286A (en) * | 2015-07-29 | 2015-11-04 | 华南理工大学 | Device and method for making refined cottons through performing high-concentration hydrogen peroxide bleaching on cotton linters |
| CN106011120A (en) * | 2016-06-18 | 2016-10-12 | 颐思特（武汉）生物科技有限公司 | Plant fiber modified compound enzyme preparation and preparation method and application thereof |
| CN106243391A (en) * | 2016-08-05 | 2016-12-21 | 南京林业大学 | The preparation method of transparent timber |
| CN106988136A (en) * | 2017-04-24 | 2017-07-28 | 保定钞票纸业有限公司 | One kind is dry to cut cotton fiber biology enzyme pulping process |
| CN107587384A (en) * | 2017-10-10 | 2018-01-16 | 枣庄市恒宇纸业有限公司 | It is a kind of to improve colored parchment vividness and effectively prevent the method to fade |
| CN107653726A (en) * | 2017-10-31 | 2018-02-02 | 福建希源纸业有限公司 | A kind of enzymatic beating process |
| CN109810964A (en) * | 2017-11-21 | 2019-05-28 | 湖南海正生物科技有限公司 | A kind of mixing enzyme preparation and preparation method thereof for mashing |
| CN110117917A (en) * | 2019-03-19 | 2019-08-13 | 阿拉尔市富丽达纤维有限公司 | A kind of technique using complex enzyme production almond pericarp pulp |
| CN113005533A (en) * | 2021-03-22 | 2021-06-22 | 太原理工大学 | Method for removing iron ions in seed hemp pulp |
| CN114150521A (en) * | 2021-12-03 | 2022-03-08 | 太原理工大学 | Preparation method of hemp-based lyocell fiber pulp |
| CN115094660A (en) * | 2022-04-12 | 2022-09-23 | 中国制浆造纸研究院有限公司 | Method for purifying and upgrading paper pulp into pulp for lyocell fibers |
| CN115637603A (en) * | 2022-11-14 | 2023-01-24 | 山东银鹰股份有限公司 | Method for preparing pulp from waste pure cotton fabric, product obtained by method and application of product |
| CN117005231A (en) * | 2023-09-07 | 2023-11-07 | 齐鲁工业大学(山东省科学院) | Method for improving wheat straw oxygen alkali pulp performance through biological enzyme composite pretreatment |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2005106110A1 (en) * | 2004-05-03 | 2005-11-10 | Centre Technique De L'industrie Des Papiers, Cartons Et Celluloses | Method for mechanical pulp production |
| EP1752533A1 (en) * | 2005-08-12 | 2007-02-14 | Institut National de la Recherche Agronomique | Fusion proteins between plant cell-wall degrading enzymes, and their uses |
| CN101235547A (en) * | 2008-03-06 | 2008-08-06 | 北京林业大学 | Method for producing bamboo dissolving pulp |
| CN101492700A (en) * | 2009-03-05 | 2009-07-29 | 王建设 | Intensive processing method for stalk articles or agricultural castoff |
| CN101736632A (en) * | 2009-12-17 | 2010-06-16 | 宜宾长毅浆粕有限责任公司 | Stewing process for preparing wood dissolving pulp by natural-color unbleached wood pulp in a modifying way |
-
2012
- 2012-12-31 CN CN201210594596.3A patent/CN103061181B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2005106110A1 (en) * | 2004-05-03 | 2005-11-10 | Centre Technique De L'industrie Des Papiers, Cartons Et Celluloses | Method for mechanical pulp production |
| EP1752533A1 (en) * | 2005-08-12 | 2007-02-14 | Institut National de la Recherche Agronomique | Fusion proteins between plant cell-wall degrading enzymes, and their uses |
| CN101235547A (en) * | 2008-03-06 | 2008-08-06 | 北京林业大学 | Method for producing bamboo dissolving pulp |
| CN101492700A (en) * | 2009-03-05 | 2009-07-29 | 王建设 | Intensive processing method for stalk articles or agricultural castoff |
| CN101736632A (en) * | 2009-12-17 | 2010-06-16 | 宜宾长毅浆粕有限责任公司 | Stewing process for preparing wood dissolving pulp by natural-color unbleached wood pulp in a modifying way |
Non-Patent Citations (4)
| Title |
|---|
| 于跃 等: "羟基自由基活性氧处理机械草浆分离半纤维素和木质素", 《北京化工大学学报（自然科学版）》 * |
| 任天宝 等: "稻草秸秆多酶水解条件研究", 《可再生能源》 * |
| 吕卫军 等: "溶解浆的生产技术现状与发展", 《中国造纸》 * |
| 曾薇 等: "阿魏酸酯酶和纤维素酶在水解汽爆稻草中的协同作用", 《生物工程学报》 * |
Cited By (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104109978A (en) * | 2014-06-24 | 2014-10-22 | 黄河三角洲京博化工研究院有限公司 | Method for preparing cotton linter dissolving pulp |
| CN105019286A (en) * | 2015-07-29 | 2015-11-04 | 华南理工大学 | Device and method for making refined cottons through performing high-concentration hydrogen peroxide bleaching on cotton linters |
| CN106011120A (en) * | 2016-06-18 | 2016-10-12 | 颐思特（武汉）生物科技有限公司 | Plant fiber modified compound enzyme preparation and preparation method and application thereof |
| CN106243391B (en) * | 2016-08-05 | 2018-12-11 | 南京林业大学 | The preparation method of transparent timber |
| CN106243391A (en) * | 2016-08-05 | 2016-12-21 | 南京林业大学 | The preparation method of transparent timber |
| CN106988136B (en) * | 2017-04-24 | 2019-03-22 | 保定钞票纸业有限公司 | One kind is dry to cut cotton fiber biological enzyme pulping process |
| CN106988136A (en) * | 2017-04-24 | 2017-07-28 | 保定钞票纸业有限公司 | One kind is dry to cut cotton fiber biology enzyme pulping process |
| CN107587384A (en) * | 2017-10-10 | 2018-01-16 | 枣庄市恒宇纸业有限公司 | It is a kind of to improve colored parchment vividness and effectively prevent the method to fade |
| CN107653726A (en) * | 2017-10-31 | 2018-02-02 | 福建希源纸业有限公司 | A kind of enzymatic beating process |
| CN109810964A (en) * | 2017-11-21 | 2019-05-28 | 湖南海正生物科技有限公司 | A kind of mixing enzyme preparation and preparation method thereof for mashing |
| CN110117917A (en) * | 2019-03-19 | 2019-08-13 | 阿拉尔市富丽达纤维有限公司 | A kind of technique using complex enzyme production almond pericarp pulp |
| CN113005533A (en) * | 2021-03-22 | 2021-06-22 | 太原理工大学 | Method for removing iron ions in seed hemp pulp |
| CN113005533B (en) * | 2021-03-22 | 2022-03-15 | 太原理工大学 | Method for removing iron ions in seed hemp pulp |
| CN114150521A (en) * | 2021-12-03 | 2022-03-08 | 太原理工大学 | Preparation method of hemp-based lyocell fiber pulp |
| CN114150521B (en) * | 2021-12-03 | 2023-02-10 | 太原理工大学 | Preparation method of hemp-based lyocell fiber pulp |
| CN115094660A (en) * | 2022-04-12 | 2022-09-23 | 中国制浆造纸研究院有限公司 | Method for purifying and upgrading paper pulp into pulp for lyocell fibers |
| CN115637603A (en) * | 2022-11-14 | 2023-01-24 | 山东银鹰股份有限公司 | Method for preparing pulp from waste pure cotton fabric, product obtained by method and application of product |
| CN117005231A (en) * | 2023-09-07 | 2023-11-07 | 齐鲁工业大学(山东省科学院) | Method for improving wheat straw oxygen alkali pulp performance through biological enzyme composite pretreatment |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103061181B (en) | 2014-10-22 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103061181B (en) | Complex enzyme preparation and technique for preparing dissolving pulp by using same | |
| CN102182090B (en) | Composite pulp of paper pulp and cotton linter and preparation method thereof | |
| CN103726377B (en) | A kind of free pulping method of low polymerization degree bamboo pulp | |
| CN103382671B (en) | Clean pulping technology for high-polymerization-degree bamboo pulp | |
| CN102127877B (en) | Production process of bamboo-dissolving pulp | |
| CN102121201B (en) | Preparation method of bamboo dissolving pulp | |
| CN106012044A (en) | Degumming technology of natural bamboo fiber | |
| CN101289761A (en) | Process for preparing dissolved pulp by oxidative decomposition of paper pulp | |
| CN1974921B (en) | Method for producing bamboo pomace | |
| CN104594090A (en) | Water-free explosion pulping process | |
| CN102444047B (en) | Method for preparing high-viscosity bagasse pulp by using oxygen and alkali cooking and ozone bleaching | |
| CN1878909A (en) | Full-closed zero discharge oxidizing pulping process and its preparation method | |
| CN101130934A (en) | Colored cotton linter pulp used for producing viscose fiber and method for making the same | |
| CN102174752A (en) | Preparation method of wood pulp for fibranne | |
| CN102747636B (en) | The method preparing high bulk Eucalyptus APMP | |
| CN101368295A (en) | Preparation method for Chinese red pine dissolving pulp | |
| CN102373637A (en) | Pretreatment process for producing bamboo fibers with bamboos | |
| CN107780277B (en) | Pulping method for treating waste paper pulp by using neutral cellulase and neutral xylanase | |
| CN101289818B (en) | Process for preparing dissolved pulp by oxidative degradation of linters | |
| CN102174753A (en) | Preparation method of wood pulp for long viscose fibers | |
| CN102995478A (en) | Bleaching method for preparing high quality low pollution bamboo wood dissolving slurry | |
| CN101381895A (en) | Pulping method without pollution and dissolving pulp produced | |
| CN101603258B (en) | Process for pretreating pure cotton fabric | |
| CN102337688A (en) | Mixed pulp used for producing viscose fiber and its production process | |
| CN111945467A (en) | Low-gram-weight high-strength craft paper and production method thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |