CN103061184A - Method of controlling secondary gummy substances by using lipase - Google Patents
Method of controlling secondary gummy substances by using lipase Download PDFInfo
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- CN103061184A CN103061184A CN2012105735306A CN201210573530A CN103061184A CN 103061184 A CN103061184 A CN 103061184A CN 2012105735306 A CN2012105735306 A CN 2012105735306A CN 201210573530 A CN201210573530 A CN 201210573530A CN 103061184 A CN103061184 A CN 103061184A
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- lipase
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- 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
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Abstract
The invention discloses a method of using lipase to treat secondary gummy substances in paper pulp and white water produced in papermaking with waste paper. The lipase is alkaline lipase with a pH value of 7.5 to 9.0, enzyme activity of more than 100 U/mL, a hydrolysis rate of triglyceride of no less than 95% and transesterification and lipogenesis rates of less than 3%. A treating method for the paper pulp comprises steps consisting of adding the lipase accounting for 0.001 to 0. 5% of dry weight of the paper pulp into the paper pulp having a concentration adjusted to be 2 to 5%, carrying out treating and filtering, centrifuging and detecting the treated pulp. A treating method for the white water comprises steps consisting of adding the lipase accounting for 0.001 to 0. 5% of dry weight of the white water into the papermaking white water, carrying out treating and filtering, centrifuging and detecting the treated white water. According to the invention, the lipase is utilized to fundamentally degrade the gummy substances and mitigate deposition tendency of the gummy substances so as to remove the gummy substances, so the problem of pollution by secondary gummy substances is thoroughly overcome; and the method is simple to operate, has a substantial removal effect and enables the quality of papermaking with waste paper to be improved and production cost to be reduced.
Description
Technical field
The invention belongs to the wastepaper pulping and papermaking field, specially refer to the method for using secondary gluing thing in the lipase control waste paper pulp-making production process.
Background technology
In recent ten years; waste paper is at the consumption rapid growth of paper industry; the ratio of secondary stock in global paper pulp total quantity consumed improves constantly; the recycling of waste paper not only can be saved a large amount of plant fiber materials, the energy and reduction cost; and be conducive to protection of the environment; alleviate the destruction to ecological environment, both had an economic benefit, good social benefit and environmental benefit are arranged again.Along with the raising of the increase of secondary stock proportion of utilization and whitewater closure circulation degree so that the gluing thing problem in the waste paper recycling process be on the rise, in the reuse process, the wax of flood or be coated with from institute in adhesive, bookbinding and bonding books, the employed hot-melt object of magazine and the boxboard on chemicals, ink carrier and remaining deinking additive remaining in the waste paper, adhesive, self-styled label or the envelope in the painting processing paper etc. all discharges formation gluing thing problem in waste paper pulp-making and bleaching process.If these materials can not disperse and remove will deposit on stock line, forming net, press section, woollen blanket, dryer surface and the paper surface aborning effectively, affect production efficiency and product quality.Therefore being controlled to as producing the key of high quality of products the gluing thing in the waste paper recycling process.
Producing method according to the gluing thing can be divided into primary gluing thing (primary stickies) and secondary gluing thing (secondary stickies), primary gluing thing originally just is present in the paper pulp, such as latex coating, printing-ink coheres material, thermosol, pressure-sensitive adhesive agent etc., they are dispersed in pulping process and subsequent treatment and are discharged in the paper pulp, be dispersed in the slurry with solid forms, they itself have certain stickiness, thereby deposit easily, cause production accident, primary gluing thing comprises large gluing thing (macro-stickies) and microstickies (micro-stickies), secondary gluing thing, source and primary gluing phase are together, but it is to be dispersed in the pulp-water system with dissolved form, when the physicochemical environment in the system changes, cause secondary gluing thing unstability to form larger stickiness aggregation, thereby deposit, more than the concentration that studies show that the primary gluing thing of the concentration ratio that can form secondary gluing thing (comprising large gluing thing and microstickies) is also high, this explanation secondary gluing thing and primary gluing phase ratio, have larger control difficulty and more serious harmfulness, therefore deposition and the control of secondary gluing thing are become more important.
In the document of retrieving, Martin AH, Orlando JR, the Control of tacky deposits on paper machines of and Richard AV.-A review [J]. Nordic Pulp and Paper Research Journal, 2006,21 (2): 154-171 one literary composition report, most of primary gluing thing available physical method is such as screening, the methods such as light impurity slagging-off are removed, and secondary gluing thing forms in process of production, be difficult to remove with physical method, the method of Chemical Control secondary gluing thing mainly comprises chemiadsorption, chemical fixation and chemical dispersion etc., chemical method reduces to a certain extent the depositional phenomenon of gluing thing or is fixed in fiber surface takes system out of, but can not be fundamentally with its removal, again can enter again slurrying during reuse and copy in the paper system at fiber, can accumulate gradually again with the whitewater closure circulation, processing the gluing thing with biological method is relatively new technology, but does not provide concrete processing method; David RJ, the Esterase-type Enzymes Offer Recycled Mills an Alternative Approach to Stickies Control[J of James WF.]. Pulp and Paper, 2003,104 (2): 28-31 one literary composition report, can make ester linkage breaking after adding esterase, reduce the stickiness of gluing thing, prevented that the wadding of particle is poly-, thereby reach the purpose of removal; Patent 200510035390, a kind of multienzyme synergism effect removes the method for resin in paper pulp, adopt lignin degradation enzyme and lipase effect that resin is had certain removal effect, resin in paper pulp is mainly derived from paper making raw material (timber), it consists of rosin acid and fatty acid material, and it has basic difference from originating, form and removing the secondary gluing thing that relates to this patent on the principle; Wang Hong shakes and adopts in the literary composition " application and the mechanism research in paper-making process such as lipase " lipase that the model thing of known structure is processed, and the result shows that selected model thing is had decomposition; The model thing that this article is selected is to consist of the large gluing thing of secondary stock (macro-stickies) chemical composition, and it is from form, generation and remove the secondary gluing thing that relates to this patent on the principle basic difference is arranged; Other gluing thing complicated component changes irregularly, adopts model thing research method enzyme can effectively be described to the mechanism of action of some kind gluing thing, but can't learn the action effect to other numerous unknown gluing thing components.
Summary of the invention
Purpose of the present invention is to provide a kind of for the method for the secondary gluing thing problem in old newsprint Deinking Pulp and old corrugated container board slurry and the mechanical pulp production process by secondary gluing thing in lipase control paper pulp and the plain boiled water.
For realizing purpose of the present invention, the technical scheme that adopts is:
A kind of method of utilizing lipase control secondary gluing thing is specifically by the secondary gluing thing in lipase control paper pulp and the mthod of white water from paper making.
Described lipase is Novozym 435, Lipozyme TL 100 L, rhizopus chinensis bacterium.
The fermentation condition of described lipase is: full-cream living bean powder 1%～3%, glucose 0.1%～3%, K
2HPO4 0.1%～2%, MgSO4 0.01%～2%, water 70～95%, inoculum concentration for the culture dish of growth 3 d with aseptic water-reducible spore suspension 2 mL of 20 mL, pH7.0～9.0.
A kind of method of utilizing lipase control secondary gluing thing disclosed by the invention may further comprise the steps:
(1) pulp processing
(a) it is dense to regulate slurry: be that 2%～5% slurry is dense with the paper pulp thin up;
(b) lipase treatment paper pulp: the dense middle adding of slurry after regulate accounts for the lipase treatment of paper pulp dry weight 0.001～0.5%, lipase active〉l00U/mL, treatment temperature is 20～60 ℃, the processing time is 60～120min;
(c) obtain the satisfactory qualified paper pulp water sample of secondary gluing thing content after the slurries filtration after will processing, the centrifugation;
(2) White Water Treatment
(a) lipase treatment mthod of white water from paper making: in mthod of white water from paper making, add the lipase treatment that accounts for plain boiled water weight 0.001～0.5%, lipase active〉l00U/mL, treatment temperature is 20～60 ℃, the processing time is 60～120min;
(b) obtain the satisfactory plain boiled water of secondary gluing thing content after the plain boiled water centrifugation after will processing;
(3) secondary gluing thing assay
(a) secondary gluing thing with negative charge measurement amount: get paper pulp water sample and plain boiled water after the centrifugation, with the colloidal titration method measure respectively with secondary gluing thing with negative charge in and required cationic demand, paper pulp water sample after the CATION quantity that obtains equals to process and the secondary gluing thing in the plain boiled water with negative charge quantity, the paper pulp water sample after namely expression is processed and the content of the secondary gluing thing in the plain boiled water;
(b) the poor mensuration of turbidity: paper pulp water sample and the plain boiled water got after centrifugal are measured turbidity, then using the sulphur acid for adjusting pH is to carry out turbidimetric analysis turbidimetry after 4 again, calculate the differences in turbidity that pH regulates front and back, calculate the clearance of secondary gluing thing, the clearance computing formula of described secondary gluing thing is:
Described centrifugal rotating speed is 1500～2500r/min, and centrifugation time is 10～20min.
Described colloidal titration method may further comprise the steps:
(1) accurately pipettes in the measuring chamber that the 10ml sample joins particle charge analyzer PCD, insert the particle charge analyzer PCD that packs into behind the plunger;
(2) adopt the titration of standard cation titrant, the consumption of record titrant, the electric charge demand of calculation sample;
(3) according to secondary gluing thing in the relation of equal quantity calculation sample with negative charge quantity.
Described standard cation titrant is diallyl dimethyl ammoniumchloride.
After adopting technique scheme, the beneficial effect that the present invention reaches is:
(1) the present invention is by the secondary gluing thing problem in the lipase control paper pulp, solve a conventional method processing primary gluing thing and ignored the problem of secondary gluing thing, eliminate the harm of secondary gluing thing in paper pulp, improved quality and the percentage of A-class goods of regenerated papermaking.
(2) the present invention is by the secondary gluing thing in the lipase control paper pulp, compare the processing methods such as chemical set and dispersion, lipase is fundamentally being degraded to the gluing thing, reduce its deposition tendency, reach the removal purpose, avoided the method removal effect such as chemistry bad, finishing agent remains in paper pulp or the plain boiled water easily, forms the shortcomings such as Re-pollution.
(3) the present invention directly carries out at production line by the method for the secondary gluing thing in the lipase control paper pulp, need not increase any equipment and operation, simple to operate, cost is low, effective, can not increase workload to production process, both reach the purpose of eliminating secondary gluing thing, improve again the regenerated papermaking quality.
Therefore, the method of the present invention by the secondary gluing thing in the lipase control paper pulp thoroughly solved the past and made the field always for paying attention to but have a strong impact on the secondary gluing thing pollution problem of product quality and cost at waste paper, have simple to operate, removal effect is remarkable, product quality is high, the advantages such as production cost is low, and is pollution-free.
The specific embodiment
Below in conjunction with embodiment the present invention is described in further detail.
Lipase can be selected the product of market sale, such as product Novozym 435, Lipozyme TL 100 L that Novozymes Company produces, also can be the product that obtains by fermentations such as rhizopus chinensises.
The below is described in further detail as an example of rhizopus chinensis liquid state fermentation yielding lipase example.
The preparation of embodiment 1 rhizopus chinensis lipase
Select the rhizopus chinensis bacterium as fermented bacterium; The solid slant medium is 5 po wort agar culture mediums, and pH 7, and liquid fermentation medium is soya-bean milk 30%, glucose 1%, and olive oil 1%, K2HPO4 2%, and MgSO4 0.5%, pH7; With the slant medium streak inoculation, cultivate 3 d to there being the black spore to generate for 30 ℃ first, then with sterilized water spore is washed gently, shake up, make spore suspension, in aseptic triangular flask, preserve.
Carry out again the fermented and cultured of rhizopus chinensis bacterium, to sterilized liquid culture medium inoculated, shaking table is cultivated, 220 r/min cultivate 60 h (allowing bacterium fully grow), get cotton-shaped thalline for 30 ℃, washing, filter to such an extent that wet thallus gets liquid rhizopus chinensis lipase, gained rhizopus chinensis lipase activity 20000U/mL, the pH value is 8.0.
Embodiment 2
Adopt the secondary gluing thing in the rhizopus chinensis lipase control secondary stock production process.
Get respectively 30gDIP and OCC oven dry stock, reduction paste dense 3%, under different rhizopus chinensis lipase additions, old newsprint DIP slurry and OCC slurry are processed, rhizopus chinensis lipase activity 20000U/mL, addition is 0.001～0.5% of DIP and OCC oven dry stock weight, 20～60 ℃ of temperature, time 60～120min.
According to document Sarja T, Zabihian M and Kourunen P. Control of Potential Secondary Stickies in Deinked Pulp. 2003 TAPPI Fall Technical Conference, Paper 22-2. is described, when the pH of water sample reduces, resin and other dissolvings deposits with the colloidal substance unstability in the slurry, cause the turbidity value of system to rise, turbidity is poor to be to be 4 o'clock turbidity and the changing value of initial turbidity, resin acid in the system; being proportionate between styrene-butadiene latex isocolloid amount of substance and turbidity are poor is through the sulphur acid for adjusting pH.Embodiment filters processing disposed slurry, gets filtrate centrifugal 15min under 2000r/min and removes the components such as fiber fines; Test cationic demand and the turbidity of centrifugal rear water sample, then using the sulphur acid for adjusting pH is to carry out turbidimetric analysis turbidimetry after 4 again, calculates the differences in turbidity of pH before and after regulating.Test result was as follows when enzyme dosage was 0.001%, 0.05%, 0.5%, and secondary stickies removal rate is with the poor change calculations of turbidity.
The result is shown in table 1, table 2:
Table 1 rhizopus chinensis lipase treatment is to the removal effect of secondary gluing thing in the DIP slurry
Table 2 rhizopus chinensis lipase treatment is to the removal effect of secondary gluing thing in the OCC slurry
DIP and OCC slurry are behind the rhizopus chinensis lipase treatment, and the cationic demand of filtrate (CD value) and turbidity are on a declining curve.The negative charge amount that cationic demand reduces colloidal substance in the explanation system reduces secondary gluing thing content; The content of the variation of turbidity difference and secondary gluing thing is the linear ratio relation, can find out by the result that turbidity is poor after enzyme is processed and reduce secondary gluing thing content in the paper pulp.
Embodiment 3
Adopt the secondary gluing thing in the rhizopus chinensis lipase control mthod of white water from paper making.
Get respectively 200mL old newsprint DIP slurry and OCC coating machine plain boiled water water sample, under different rhizopus chinensis lipase additions, process.Rhizopus chinensis lipase activity 20000U/mL, addition are 0.001～0.5% of old newsprint DIP slurry and OCC coating machine plain boiled water water sample weight, 20～60 ℃ of temperature, time 60～120min.
Remove the components such as fiber fines to processing rear paper machine white water centrifugal 15min under 2000r/min; Test cationic demand and the turbidity of centrifugal rear plain boiled water, then using the sulphur acid for adjusting pH is to carry out turbidimetric analysis turbidimetry after 4 again, calculates the differences in turbidity of pH before and after regulating.Test result was as follows when enzyme dosage was 0.001%, 0.05%, 0.5%, and secondary stickies removal rate is with the poor change calculations of turbidity.
The result is shown in table 3, table 4:
Table 3 rhizopus chinensis lipase treatment DIP coating machine plain boiled water performance test results
Table 4 rhizopus chinensis lipase treatment OCC coating machine plain boiled water performance test results
DIP and OCC coating machine plain boiled water are behind the rhizopus chinensis lipase treatment, and the cationic demand of paper machine white water reduces, and turbidity is poor to be reduced, and the components such as gluing thing, resin are degraded secondary gluing thing content in the explanation system under the effect of enzyme.
Embodiment 4
Adopt the secondary gluing thing in the rhizopus chinensis lipase control mechanical pulp production process.
Get 30g over dry Masson Pine TMP slurry, reduction paste is dense 3%, under different rhizopus chinensis lipase additions, slurry is processed, and rhizopus chinensis lipase activity 20000U/mL, addition are 0.001～0.5% of over dry Masson Pine TMP slurry weight, 20～60 ℃ of temperature, time 60～120min.
To processing slurries filtration, get filtrate centrifugal 15min under 2000r/min and remove the components such as fiber fines; Test cationic demand and the turbidity of centrifugal rear water sample, then using the sulphur acid for adjusting pH is to carry out turbidimetric analysis turbidimetry after 4 again, calculates the differences in turbidity of pH before and after regulating.Test result was as follows when enzyme dosage was 0.001%, 0.05%, 0.5%, and secondary stickies removal rate is with the poor change calculations of turbidity.
The result is as shown in table 5:
Table 5 rhizopus chinensis lipase treatment is to the removal effect of secondary gluing thing in the OCC slurry
The resinae material is the main component that consists of secondary gluing thing in the mechanical pulp, the TMP slurry is behind the rhizopus chinensis lipase treatment, the resinae material is degraded to pure and mild aliphatic acid under the effect of lipase, molecular weight or the degree of polymerization reduce, the cationic demand of filtrate and turbidity are poor to be reduced, secondary gluing thing content.
Claims (7)
1. a method of utilizing lipase control secondary gluing thing is characterized in that: by the secondary gluing thing in lipase control paper pulp and the mthod of white water from paper making.
According to claim 1 the method for the lipase that utilizes control secondary gluing thing, it is characterized in that: described lipase is Novozym 435, Lipozyme TL 100 L, rhizopus chinensis bacterium.
3. the method for utilizing lipase control secondary gluing thing according to claim 2, it is characterized in that: the fermentation condition of described lipase is: full-cream living bean powder 1%～3%, glucose 0.1%～3%, K
2HPO4 0.1%～2%, MgSO4 0.01%～2%, water 70～95%, inoculum concentration for the culture dish of growth 3 d with aseptic water-reducible spore suspension 2 mL of 20 mL, pH7.0～9.0.
4. the method for utilizing lipase control secondary gluing thing according to claim 1 may further comprise the steps:
(1) pulp processing
(a) it is dense to regulate slurry: be that 2%～5% slurry is dense with the paper pulp thin up;
(b) lipase treatment paper pulp: the dense middle adding of slurry after regulate accounts for the lipase treatment of paper pulp dry weight 0.001～0.5%, lipase active〉l00U/mL, treatment temperature is 20～60 ℃, the processing time is 60～120min;
(c) obtain the satisfactory qualified paper pulp water sample of secondary gluing thing content after the slurries filtration after will processing, the centrifugation;
(2) White Water Treatment
(a) lipase treatment mthod of white water from paper making: in mthod of white water from paper making, add the lipase treatment that accounts for plain boiled water weight 0.001～0.5%, lipase active〉l00U/mL, treatment temperature is 20～60 ℃, the processing time is 60～120min;
(b) obtain the satisfactory plain boiled water of secondary gluing thing content after the plain boiled water centrifugation after will processing;
(3) secondary gluing thing assay
(a) secondary gluing thing with negative charge measurement amount: get paper pulp water sample and plain boiled water after the centrifugation, with the colloidal titration method measure respectively with secondary gluing thing with negative charge in and required cationic demand, paper pulp water sample after obtaining processing and the secondary gluing thing in the plain boiled water with negative charge quantity, the paper pulp water sample after namely expression is processed and the content of the secondary gluing thing in the plain boiled water;
(b) the poor mensuration of turbidity: paper pulp water sample and the plain boiled water got after centrifugal are measured turbidity, then using the sulphur acid for adjusting pH is to carry out turbidimetric analysis turbidimetry after 4 again, calculate the differences in turbidity that pH regulates front and back, calculate the clearance of secondary gluing thing, the clearance computing formula of described secondary gluing thing is:
5. the method for utilizing lipase control secondary gluing thing according to claim 4, it is characterized in that: described centrifugal rotating speed is 1500～2500r/min, centrifugation time is 10～20min.
6. the method for utilizing lipase control secondary gluing thing according to claim 4 is characterized in that described colloidal titration method may further comprise the steps:
(1) accurately pipettes in the measuring chamber that the 10ml sample joins particle charge analyzer PCD, insert the particle charge analyzer PCD that packs into behind the plunger;
(2) adopt the titration of standard cation titrant, the consumption of record titrant, the electric charge demand of calculation sample;
(3) according to secondary gluing thing in the relation of equal quantity calculation sample with negative charge quantity.
7. the method for utilizing lipase control secondary gluing thing according to claim 6, it is characterized in that: described standard cation titrant is diallyl dimethyl ammoniumchloride.
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| CN103074795A (en) * | 2012-12-26 | 2013-05-01 | 泰兴市一鸣生物制品有限公司 | Method for controlling secondary stickies through lipase |
| CN105040505A (en) * | 2015-06-30 | 2015-11-11 | 华南理工大学 | Method for processing papermaking white water resin through aspergillus oryzae whole-cell catalyst |
| CN106480771A (en) * | 2016-12-23 | 2017-03-08 | 江南大学 | A kind of method of utilization cutin ferment treatment mthod of white water from paper making |
| CN109722422A (en) * | 2018-12-31 | 2019-05-07 | 苏州埃斯腾特生物科技有限公司 | High temperature resistant lipase and application thereof |
| CN112813716A (en) * | 2021-02-23 | 2021-05-18 | 广东理文造纸有限公司 | System and method for removing spots and adhesive deposits by using biological enzyme for papermaking |
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| CN112813716A (en) * | 2021-02-23 | 2021-05-18 | 广东理文造纸有限公司 | System and method for removing spots and adhesive deposits by using biological enzyme for papermaking |
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