CN1664026A - Component and using method of bioenzyme deinking agent for mixed news waste papers - Google Patents

Component and using method of bioenzyme deinking agent for mixed news waste papers Download PDF

Info

Publication number
CN1664026A
CN1664026A CN 200410015511 CN200410015511A CN1664026A CN 1664026 A CN1664026 A CN 1664026A CN 200410015511 CN200410015511 CN 200410015511 CN 200410015511 A CN200410015511 A CN 200410015511A CN 1664026 A CN1664026 A CN 1664026A
Authority
CN
China
Prior art keywords
deinking
waste paper
polyoxyethylene glycol
news
agent
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.)
Pending
Application number
CN 200410015511
Other languages
Chinese (zh)
Inventor
蔡亲荫
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
BIO SCIENTIFIC (SHENZHEN) Co Ltd
Original Assignee
BIO SCIENTIFIC (SHENZHEN) Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by BIO SCIENTIFIC (SHENZHEN) Co Ltd filed Critical BIO SCIENTIFIC (SHENZHEN) Co Ltd
Priority to CN 200410015511 priority Critical patent/CN1664026A/en
Publication of CN1664026A publication Critical patent/CN1664026A/en
Pending legal-status Critical Current

Links

Images

Landscapes

  • Paper (AREA)

Abstract

The invention discloses the components of the mixed newsprint waste paper organism enzyme void reagent and the applying method, providing the new organism enzyme deinking agent comprised with xylanase, cellulase and the polymer called as macrogol. This kind of organism enzyme deinking reagent is suitable for the void of the mixed newsprint waste paper. The best consumption is mixed enzyme 6x10 in terms of the effect of void and bleaching and the economic benefit.

Description

The component and the application method that mix the agent of news waste paper enzymatic deinking
Invention field
Patent of the present invention relates to the application of biological enzyme in deinking technology, specifically, this invention provide a kind of new be the waste paper deinking agent and the application method of main ingredient with the biological enzyme.
Technical background
Waste paper regenerated fiber is one of contemporary paper-making industry important source material source, and proportion is increasing.News waste paper accounts for over half in the waste paper of daily recovery.Deinking comprises that the news deinking is an important step of waste paper regenerated utilization.Deinking technology is finished by chemical deinking method for a long time.Technological process comprises mechanical pulping and chemical deinking, chemical bleaching, screening the pulp slagging-off, flotation and washing.Wherein need to add a series of chemical, as caustic soda, DEINKING CHEMICALS (containing the trapping agent and the surfactant that comprise soap), water glass, EDTA and hydrogen peroxide.Some can cause corrosion to mechanical means these chemical, and some can cause water to pollute, and increases the COD index of plain boiled water.Since the last century the eighties, the people's application of biological enzyme technology in chemical pulping and deinking technology that begin one's study.Discoveries such as French scientist Comtat are handled wood pulp with zytase can help fibriilar formation, therefore obtains French Patent in 1984, and the patent No. is 2,557,894.Scientists such as Viikari are at report in 1986, can significantly reduce chlorine consumption in the chemical bleaching process with zytase processing hardwood pulp chemistry floats before.This achievement in research has been opened the prelude that in paper pulp pulping process applying biological enzyme carries out less chlorine bleaching.And then, a series of discoveries that studies confirm that people such as Viikari, thus impel the appearance of a collection of application invention patent.Simultaneously, some biological enzymes, as cellulase, zytase, lipase, manganese peroxidase, laccase etc. are found in succession and can help deinking, and can play bleaching action, simultaneously can be in the characteristic that improves regenerated fibre in varying degrees.These discoveries make people produce extensive interest to replace traditional chemical method Deinking Technology with biological enzyme technology.In recent years, a large amount of research and development has made some enzymatic deinking technological direction maturations, and commercialization.Because the enzymatic deinking technology can reduce the injected volume of chemical greatly in the deinking process, thereby significantly reduce COD, simultaneously can improve papery, slow down in addition, therefore have broad application prospects in the deinking field in of the corrosion of deinking process process to equipment.Yet still there are some shortcomings in the enzymatic deinking technology of having used.One of them is that biological enzyme can only the substituted chemistry deinking agent and some other chemical, can not reduce the chemical bleaching agent.Therefore, though show certain advantage aspect comprehensive benefit, its direct production cost is saved very limited than chemical method.
Summary of the invention
The research and development aim of this invention is an object to mix news waste paper (comprising old newspaper and other stale news printing paper) exactly, develops the enzymatic deinking agent that a kind of comprehensive benefit that can improve in the deinking technology can significantly reduce direct production cost again.According to this invention, the printing ink that mixes in the news waste paper can be effectively removed in this enzymatic deinking agent under traditional deinking processing unit condition, and can keep or improve every papery index, therefore can be used for replacing the traditional chemical deinking.
This invention provides a kind of new enzymatic deinking agent that is composition with zytase and cellulase and a kind of polymer that is called as polyoxyethylene glycol.The optimum proportion of zytase and cellulase is 2: 1, and allowing mobility scale is 1: 1 to 3: 1.Zytase belongs to β-1,4 endo-xylanase family, derives from wooden mould (Trichoderma longibrachiatum) RT-19 bacterial strain of developing than biotechnology difficult to understand (Shenzhen) company limited; Cellulase is the acidic cellulase of buying from market.The content 2% (W/V) of polyoxyethylene glycol in enzyme liquid.Can be directly used in deinking behind zytase and cellulase and the polyoxyethylene glycol thorough mixing.Also can under normal temperature (20-30 ℃) condition, preserve at least 5 months.In above-mentioned enzymatic deinking agent, biological enzyme plays leading role undoubtedly to deinking, but polymer compounds: polyoxyethylene glycol also plays an important role.Evidence, polyoxyethylene glycol can not only play the proteic effect of protective enzyme and can play a part surfactant and dispersion agent in deinking process, help the flotation after the deinking.Therefore, use this enzymatic deinking agent, do not need to add in addition other surfactant or dispersion agent.Prove that through laboratory and paper mill deinking process pilot scale this enzymatic deinking agent is suitable for mixing the deinking of news waste paper.Consider that from factors such as deinking and bleaching effect and economic benefits optimum amount is: mixed enzyme 6 * 10 6The absolute dried waste paper of unit/ton (zytase and cellulase ratio are 2: 1), the absolute dried waste paper of polyoxyethylene glycol 40 gram/tons.Above-mentioned enzymatic deinking agent usage in mixing news deinking technology is very easy.Its usage is: add earlier an amount of hot water (about 55 ℃) in pulping engine pot body, press the optimum amount standard then and add the enzymatic deinking agent, then add waste paper and the pulping 25 minutes of starting shooting, shut down insulation 10 minutes again, at last blowing.Follow-up technological process comprises screening the pulp, flotation, and washing and making beating and chemical method are identical.Evidence, producing low whiteness news paper waste, when starching (whiteness is 50%ISO) as the lining of category-A white board, enzymatic deinking agent provided by the invention can replace in the chemical method all chemical in the pulping deinking and bleaching process fully, comprise DEINKING CHEMICALS, caustic soda, water glass, EDTA and hydrogen peroxide, and obtain whiteness identical and close residual ink index with chemical method.Calculate at comparable price, save Material Cost more than 40%, dry pulp per ton is saved 60 yuans of supplies expensess approximately.Producing high whiteness news paper waste, during as commercial news paper pulp (whiteness is more than the 56%ISO), this enzymatic deinking agent can the substituted chemistry deinking agent, water glass, EDTA, save simultaneously caustic soda 60% or more with hydrogen peroxide 20-30%.Calculate at comparable price, save Material Cost 25-30%.
Description of drawings
Fig. 1 is the influence of different concns polyoxyethylene glycol-6000 pair zytase enzymic activity in the prolonged preservation process.
The DNS method of using is surveyed in the enzyme biopsy.Among the figure ◆ do not add polyoxyethylene glycol-6000; ■ adds 1% polyoxyethylene glycol-6000; ▲ adding 2% polyoxyethylene glycol-6000.
Embodiment
Embodiment 1:
Embodiment 1 is combined as purpose and comes unfolded to filter out best biological enzyme.The waste paper that is used for this test derives from from the old newspaper of Hong Kong import, wherein is mixed with the outdated magazine printing paper below 10%.The biological enzyme that is used to test is a zytase, cellulase (acidity) and amylase.Wherein, zytase derives from wooden mould (Trichoderma longibrachiatum) RT-19 bacterial strain of developing than biotechnology difficult to understand (Shenzhen) company limited; Cellulase (acidity) and amylase are bought from biochemical industry market respectively.In order to assess the effect of each enzyme to news deinking independent action, in the fs of test, we carry out deinking separately with these three kinds of enzymes respectively and handle.The consumption of every kind of biological enzyme is respectively 1,2,4,6 dried waste paper of units/gram (unit of enzyme activity is defined as: at 50 ℃, under the condition of pH4.8, produced 1 milligram of reducing sugar in 1 hour, or at 60 ℃, liquefaction 1 restrains starch under the condition of pH6).Treatment time is 35 minutes, and temperature is 50 ℃.Controlled trial is the deinking of traditional chemical method, and consumption is: 1% DEINKING CHEMICALS, 1.5% caustic soda, 2% hydrogen peroxide.Treatment time is 30 minutes, 60 ℃ of test-results of temperature show, weigh with whiteness and residual ink index, and zytase is to mixing deinking efficiency the best of news waste paper, next is cellulase (acidity), and amylase inoperative basically (data not shown).Yet the effect of single creature enzyme does not all reach the effect of chemical deinking.In the subordinate phase of test, these three kinds of biologies mix use respectively, and compare with chemical deinking.The result shows, zytase and cellulase mix the effect of use all than the better effects if of using separately separately, and can reach the effect of chemical deinking, and amylase mixes with these two kinds of enzymes respectively to use and does not all play a part reinforced effects, therefore is excluded outside the enzymatic deinking agent prescription.The phase III of test is optimum proportion and the consumption that further screens zytase and cellulase.Orthogonal Design Method Design is adopted in test.The consumption of every kind of enzyme is respectively 1,1.5,2,3,4,6 dried waste paper of units/gram; Zytase and cellulase ratio are respectively: 1: 2, and 1: 1,2: 1 and 3: 1.Test-results (data slightly) proves, with the enzyme amount during in the dried waste paper level of 6 units/gram, the combination of best results is 2: 1, secondly is 1: 1 and 3: 1 when always; With the enzyme amount during in the dried waste paper level of 9 units/gram, 2: 1 and combination in 3: 1 do not have evident difference when always.Table 1 shows in the combination in 2: 1 different always with the deinking efficiency of enzyme amount.From the deinking result of table 1, the consumption of 6 and 9 the dried waste paper of units/gram is to not significantly difference of deinking efficiency, but from the consideration of Financial cost aspect, 6 dried waste paper biological enzymes of units/gram are undoubtedly optimum amount.
Embodiment 2:
The main purpose of this test is to filter out a kind of additive that had not only helped the prolonged preservation of enzymatic deinking agent but also helped to strengthen the deinking efficiency of biological enzyme.Tool report, some have the polymer of surfactant function, as polyoxyethylene glycol and tween the stability of some zymoprotein are had certain effect, and therefore, we at first adopt these two kinds of polymer compounds to test.The tween-80 that this test is used, polyoxyethylene glycol is polyoxyethylene glycol-6000 (PEG-6000).Fs in test adds tween-80 and polyoxyethylene glycol-6000 respectively in the enzymatic deinking agent, then enzyme liquid is heated to 50 ℃, then respectively 1,2, and the activity of each time point sampling in 4,6,8 hours and detection enzyme.Test-results proves that tween-80 is to the not significantly effect of thermostability of enzyme, but the thermostability of polyoxyethylene glycol-6000 pair enzyme has fairly obvious effect (data slightly).In the test subordinate phase, we then verify polyoxyethylene glycol-6000 in the prolonged preservation of biological enzyme whether the stability to enzyme have a significant effect.In the enzymatic deinking agent, add 1% and 2% polyoxyethylene glycol-6000 respectively, then enzyme liquid is stored under the natural temperature, and detects the activity of enzyme every sampling in 5 days.Test was carried out 5 months continuously.The results are shown in Figure 1.The sample that does not add polyoxyethylene glycol-6000, its activity has only below 30% of initial activity after 5 months, and the sample that adds 2% polyoxyethylene glycol-6000 then can keep 90% activity.The sample that adds 1% polyoxyethylene glycol-6000 also can keep into 70% activity.This result shows that polyoxyethylene glycol can play good stabilization to zymoprotein, and its optimum amount is 2%.
Embodiment 3:
This is paper mill production technique applicability pilot scale, and purpose is to check the effect of enzymatic deinking agent reality in deinking process of being developed.Fs carries out at the mixing news deinking production line that Jiangmen city Xinhua Paper Making Mill in Guangdong Province's produces category-A blank paper gasket slurry.This production line adopts discontinuous pulping and flotation to add technologies such as washing.The waste paper source is the mixing news waste paper from Hong Kong import, is mainly old newspaper and is lower than 10% outdated magazine paper.The paper waste whiteness of producing requires to more than the 45%ISO, and the residual ink index is below the 400ppm.The conventional chemical deinking method that this production is adopted need add chemical such as caustic soda, DEINKING CHEMICALS, water glass and hydrogen peroxide.The test in this stage divides totally 10 days two phases.Test divides two groups, and one group only adds enzymatic deinking agent (containing polyoxyethylene glycol-6000), and another group adds the flotation agent (mainly containing the fatty acid salt surfactant) that adds 200 milliliters of/ton dried waste paper on the basis of enzymatic deinking agent again in adding.In the conventional chemical deinking, take a sample in contrast in different steps respectively before the test.In test, the consumption of biological enzyme is 6 * 10 6The dried waste paper of unit/ton, the consumption of polyoxyethylene glycol-6000 are the dried waste paper of 40 gram/tons (the enzymatic deinking agent adds polyoxyethylene glycol-6000, totally 2 liters).Using method is, adds hot water (55-58 ℃) earlier in pulping engine pot body, adds the enzymatic deinking agent again, adds waste paper (keep slurry dense at 12-15%) then, and the continuous pulping 25 minutes of then starting shooting is shut down insulation 15 minutes, last blowing again.Follow-up technological process comprises screening the pulp, and flotation is identical with chemical method with washing.In process of the test, in the sampling of different steps and different time and to whiteness, residual ink concentration and other papery index detect respectively.According to the observation of flotation section in the test, in the test group that only adds the enzymatic deinking agent, it is moderate to foam during flotation, and the printing ink removal is normal, the not significantly difference of the effect of whiteness after flotation and the washing and residual ink concentration index and interpolation flotation agent.And the combination of interpolation flotation agent, it is on the high side to foam, and may cause fiber loss.The result proves that polyoxyethylene glycol is a kind of surface of good activator in the deinking process, can play effects such as dispersion and capture to ink particle.And, use very easy as a component of enzymatic deinking agent.Table 2 provides the partial data in the test and the comparison of some data in the chemical deinking.The result shows, in mixing the news deinking, adopt the enzymatic deinking agent, must further not bleach the whiteness effect that just can reach chemical deinking (comprising bleaching) and close residual ink index, thereby save a large amount of chemical, not only raising comprises the overall economic efficiency of environmental protection greatly, and can directly save Material Cost more than 40%.Calculate at comparable price, dry pulp per ton is saved 60 yuans of supplies expensess approximately.Five Lian County connect and to like paper mill news deinking production line and carry out the subordinate phase of test in the Shandong Province.This production line production news paper pulp adopts discontinuous pulping and multistage continuous washing technology, no floatation process.Pulp brightness requires to reach more than the 56%ISO, and the residual ink concentration index is below 150ppm.The traditional chemical method deinking that this line adopts comprises the use DEINKING CHEMICALS, caustic soda, water glass and hydrogen peroxide.Test in this stage was carried out 4 days altogether.In test, the consumption of enzymatic deinking agent is identical with the fs, and the pulping temperature is also identical with the fs with order of addition(of ingredients).Pulping time is 35 minutes continuously, adds 0.35% caustic soda and 2% hydrogen peroxide then and bleaches 10 minutes.Process of the test is taken a sample stage by stage, detects and compares with the sampling effect of chemical deinking.Test-results shows that applying biological enzyme deinking agent can replace DEINKING CHEMICALS and water glass, saves caustic soda 75% and hydrogen peroxide 30%, and can reach same whiteness of chemical deinking and residual ink concentration index (data slightly).Calculate at comparable price, can save Material Cost 25-30%.
The comparison of table 1 different amounts enzymatic deinking and chemical deinking effect
The biological enzyme consumption is handled in deinking *Whiteness %ISO tensile strength index burst index
The dried waste paper Nm/g of units/gram Kp am 2/ g
The deinking slurry-34.8 20.6 1.15
Chemical method *Deinking-50.7 23.0 1.20
4 47.8 26.1 1.18
Biological enzyme
6 50.5 24.3 1.20
Deinking
9 50.8 22.9 1.17
* zytase and cellulase ratio are 2: 1 in the enzymatic deinking agent; The polyoxyethylene glycol consumption is the dried waste paper of 40 micrograms/restrain.
* chemical deinking 1% DEINKING CHEMICALS, 1.5% caustic soda, 3% water glass and 2% hydrogen peroxide.
Table 2 is mixing news deinking process application enzymatic deinking agent and chemical method
The comparison of deinking efficiency
De-inking method sampling whiteness %ISO residual ink tensile index tear index
Concentration ppm Nm/g mN.m 2/ g
1 51.7 200.1 19.92 9.35
Chemical method 2 48.9 232.4 18.74 8.35
Average 50.3 216.3 19.33 8.85
1 49.3 327.1 19.31 7.50
2 51.4 235.9 18.35 7.64
Biological enzyme
3 48.6 336.6 16.83 8.10
Average 49.8 299.87 18.16 7.75

Claims (10)

1. a component and an application method that mixes the agent of news waste paper enzymatic deinking is characterized in that enzymatic deinking agent prescription component by zytase, and cellulase and polyoxyethylene glycol mix to be formed.
2. according to the application method of the described mixing news of claim 1 waste paper enzymatic deinking agent, the optimum proportion that it is characterized in that zytase and cellulase is 2: 1, but mobility scale is 1: 1 to 3: 1.
3. according to the application method of the described mixing news of claim 1 waste paper enzymatic deinking agent, it is characterized in that the optimum content of polyoxyethylene glycol in the enzymatic deinking agent is 2%, minimum content is more than 1%.
4. according to the described enzymatic deinking agent of claim 1, it is characterized in that being used to containing the deinking of any waste paper of 70% above news waste paper.
5. according to claim 1,2 described enzymatic deinking agent, the optimum amount that it is characterized in that mixing in the news deinking technology is 6 * 10 6The absolute dried waste paper of unit/ton, minimum amount is 4 * 10 6The absolute dried waste paper of unit/ton.
6. zytase according to claim 1, it is characterized in that zytase for derive from wood mould ( Trichoderma Iongibrachiatum) RT-19 bacterial strainβ 1, the 4-endo-xylanase.
7. according to claim 1,3 described polyoxyethylene glycol, it is characterized in that the optimum amount of polyoxyethylene glycol in mixing news deinking technology is the absolute dried waste paper of 40 gram/tons, minimum amount is the absolute dried waste paper of 30 gram/tons.
8. according to claim 1,3,7 described polyoxyethylene glycol, it is characterized in that polyoxyethylene glycol is used for as the protection of zymoprotein or stablizer with as the surfactant of deinking.
9. according to claim 1,3,7 described polyoxyethylene glycol, it is characterized in that comprising different molecular weight.
10. according to claim 1,3,7 described polyoxyethylene glycol, it is characterized in that in the enzymatic deinking agent, adding or direct adding and polyethylene glycol structures and intimate polymer or different aggressiveness compound in deinking.
CN 200410015511 2004-03-02 2004-03-02 Component and using method of bioenzyme deinking agent for mixed news waste papers Pending CN1664026A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN 200410015511 CN1664026A (en) 2004-03-02 2004-03-02 Component and using method of bioenzyme deinking agent for mixed news waste papers

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN 200410015511 CN1664026A (en) 2004-03-02 2004-03-02 Component and using method of bioenzyme deinking agent for mixed news waste papers

Publications (1)

Publication Number Publication Date
CN1664026A true CN1664026A (en) 2005-09-07

Family

ID=35035345

Family Applications (1)

Application Number Title Priority Date Filing Date
CN 200410015511 Pending CN1664026A (en) 2004-03-02 2004-03-02 Component and using method of bioenzyme deinking agent for mixed news waste papers

Country Status (1)

Country Link
CN (1) CN1664026A (en)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1325724C (en) * 2005-11-18 2007-07-11 山东轻工业学院 Neutral deinking method for waste newspaper
CN100365201C (en) * 2005-11-18 2008-01-30 山东轻工业学院 Enzymatic deinking method for waste newspaper
CN102268828A (en) * 2011-07-13 2011-12-07 广东省造纸研究所 Method for deinking waste paper by using multiple enzymes produced from two kinds of strains
CN102532980A (en) * 2011-11-14 2012-07-04 东莞市绿微康生物科技有限公司 Neutral biological enzyme deinking agent and preparation method thereof
CN103525797A (en) * 2012-07-03 2014-01-22 深圳市绿微康生物工程有限公司 Liquid lipase protective agent as well as preparation method and application thereof
CN104711887A (en) * 2015-02-16 2015-06-17 广西大学 Method for preparing 3D printing materials from recovered waste raw materials containing plant fiber
CN106221355A (en) * 2016-07-22 2016-12-14 景田（上海）环保科技有限公司 A kind of enzyme waste paper deinking agent
CN110528304A (en) * 2019-08-27 2019-12-03 绵阳禾本生物工程有限公司 A kind of high-efficiency environment friendly Biologic Deinking Agent
CN114147003A (en) * 2021-10-18 2022-03-08 电子科技大学 Whole paper deinking method and device based on biological enzyme deinking

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN100365201C (en) * 2005-11-18 2008-01-30 山东轻工业学院 Enzymatic deinking method for waste newspaper
CN1325724C (en) * 2005-11-18 2007-07-11 山东轻工业学院 Neutral deinking method for waste newspaper
CN102268828A (en) * 2011-07-13 2011-12-07 广东省造纸研究所 Method for deinking waste paper by using multiple enzymes produced from two kinds of strains
CN102268828B (en) * 2011-07-13 2013-12-11 广东省造纸研究所 Method for deinking waste paper by using multiple enzymes produced from two kinds of strains
CN102532980A (en) * 2011-11-14 2012-07-04 东莞市绿微康生物科技有限公司 Neutral biological enzyme deinking agent and preparation method thereof
CN103525797B (en) * 2012-07-03 2016-04-13 深圳市绿微康生物工程有限公司 Liquid aliphatic enzymatic protective reagent and its preparation method and application
CN103525797A (en) * 2012-07-03 2014-01-22 深圳市绿微康生物工程有限公司 Liquid lipase protective agent as well as preparation method and application thereof
CN104711887A (en) * 2015-02-16 2015-06-17 广西大学 Method for preparing 3D printing materials from recovered waste raw materials containing plant fiber
CN104711887B (en) * 2015-02-16 2016-08-24 广西大学 With reclaiming the method that 3D printed material prepared by the discarded raw material containing Plant fiber
CN106221355A (en) * 2016-07-22 2016-12-14 景田（上海）环保科技有限公司 A kind of enzyme waste paper deinking agent
CN106221355B (en) * 2016-07-22 2019-08-23 景田（上海）环保科技有限公司 A kind of biological enzyme waste paper deinking agent
CN110528304A (en) * 2019-08-27 2019-12-03 绵阳禾本生物工程有限公司 A kind of high-efficiency environment friendly Biologic Deinking Agent
CN114147003A (en) * 2021-10-18 2022-03-08 电子科技大学 Whole paper deinking method and device based on biological enzyme deinking

Similar Documents

Publication Publication Date Title
Ibarra et al. Enzymatic deinking of secondary fibers: cellulases/hemicellulases versus laccase-mediator system
Del Rio et al. Fibre size does not appear to influence the ease of enzymatic hydrolysis of organosolv-pretreated softwoods
CN104342424B (en) For changing and improving fiber oxidation enzymatic compositions and papermaking process and the application of fibre property
US6093282A (en) Method for recycling of old corrugated container using flotation and enzymatic hydrolysis
CN103821022B (en) The method of neutral cellulase preliminary treatment needle slurry and broad-leaved slurry
Kim et al. The effects of nonionic surfactants on the pretreatment and enzymatic hydrolysis of recycled newspaper
Zhao et al. Xylanase pretreatment leads to enhanced soda pulping of wheat straw
CN1068161A (en) Lignocellulose-containing materials delignification, bleaching and with the method for the treatment of waste water by synergetic shellac enzyme
CN1664026A (en) Component and using method of bioenzyme deinking agent for mixed news waste papers
Jeffries et al. Bioconversion of secondary fiber fines to ethanol using counter-current enzymatic saccharification and co-fermentation
CN105431586A (en) Reducing content of hexenuronic acids in cellulosic pulp
Salles et al. Effect of cellulase-free xylanases from Acrophialophora nainiana and Humicola grisea var. thermoidea on eucalyptus kraft pulp
Saleem et al. Potential of xylanase from thermophilic Bacillus sp. XTR-10 in biobleaching of wood kraft pulp
CN104911937B (en) A kind of paper and preparation method thereof
CN1648331A (en) New process for lipase waste paper deinking
CN101285058B (en) Compound enzyme preparation for manioc waste industry
Singh et al. Cellulase-assisted refining optimization for saving electrical energy demand and pulp quality evaluation
Dhiman et al. ‘Single lay out’and ‘mixed lay out’enzymatic processes for bio-bleaching of kraft pulp
Nguyen et al. Bleaching of kraft pulp by a commercial lipase: Accessory enzymes degrade hexenuronic acids
Sharma et al. Eco-friendly bleaching of agrowaste wheat straw using crude alkalo-thermotolerant cellulase-free xylano-pectinolytic enzymes
CN107904266A (en) A kind of efficient green improves preprocess method and the application of lignocellulosic enzymolysis saccharification efficiency
CN104213448A (en) Laccase/glutamic acid-based biological treatment method for inhibiting strength degradation of regenerated fibers
Gonçalves et al. Xylanase recycling for the economical biobleaching of sugarcane bagasse and straw pulps
Kim et al. Enhancement of enzymatic digestibility of recycled newspaper by addition of surfactant in ammonia-hydrogen peroxide pretreatment
CN109024038A (en) The modification pulping process and modified slurry and papermaking process of secondary stock

Legal Events

Date Code Title Description
C06 Publication
PB01 Publication
C10 Entry into substantive examination
SE01 Entry into force of request for substantive examination
C02 Deemed withdrawal of patent application after publication (patent law 2001)
WD01 Invention patent application deemed withdrawn after publication