Bioenzyme composition, bioenzyme preparation and method for treating stickies and ink in waste paper

Abstract

The present invention provides a bio-enzyme composition, a bio-enzyme preparation and a method for treating adhesives and ink in waste paper, and relates to the technical field of waste paper adhesives and ink treatment. The bio-enzyme composition provided by the present invention comprises lipase, esterase, modified cellulase and polygalacturonase. The bio-enzyme preparation comprises the above-mentioned bio-enzyme composition, an organic solvent, a surfactant and an activator. The method for treating adhesives and ink in waste paper with a bio-enzyme preparation: the waste paper is crushed and mixed with water, a surfactant and an activator are added and stirred; the bio-enzyme composition and an organic solvent are added and stirred to obtain a mixture; the mass of the bio-enzyme is 0.01%-0.02% of the mass of the waste paper; slag removal, coarse screening, fine screening, flotation, and filtration. The technical scheme of the present invention significantly improves the removal effect of adhesives and inks.

Description

Technical Field

[0001] The invention relates to the technical field of waste paper stickies and ink treatment, and in particular to a bio-enzyme composition, a bio-enzyme preparation and a method for treating stickies and ink in waste paper. Background Art

[0002] my country is a major papermaking country, and the recycling of waste paper has become an important way to solve the shortage of raw materials in the papermaking industry.

[0003] The large-scale recycling of secondary fibers plays an important role in modern papermaking technology. At present, the world's waste paper pulp production is second only to chemical pulp, accounting for one-third of the world's total pulp. But on the one hand, the problem of stickies in waste paper has always been one of the main obstacles affecting the recycling of waste paper. Stickies themselves are sticky and often adsorbed together with inorganic fillers, fine fibers, etc. to form sticky precipitates, which lead to abnormal dehydration of paper machines, increased gas consumption, frequent paper breaks and other production abnormalities, seriously affecting the papermaking production process. Since short fibers have no thermal dispersion, stickies in the pulp cannot be handled. On the other hand, deinking is also the key to waste paper recycling technology; at present, the methods used for waste paper deinking mainly include alkaline chemical deinking and enzyme deinking. Traditional alkaline chemical deinking requires the addition of a lot of chemicals, which increases the pollution load of deinking wastewater, causes low pulp whiteness, high residual ink content, high paper dustiness, high fine adhesive content and other problems; waste paper containing more mechanical pulp will undergo "alkali blackening" during the alkaline deinking process, causing the pulp whiteness to decrease. In addition, traditional chemical deinking is not conducive to improving the water filtration and strength properties of pulp. With the increasing complexity of waste paper types and ink formulations, the use of a single traditional chemical deinking method has the disadvantages of being difficult to improve the quality of deinked pulp and causing serious pollution.

[0004] Bioenzyme preparations have been used in the pulp and paper industry for many years. They are mainly used to control microbial deposits to enhance bleaching effects and cleaning of paper machine systems. However, the use of bioenzyme preparations to control stickies in waste pulp and white water circulation systems has only begun in recent years. Specific bioenzyme preparations can reduce the size of stickies and effectively control stickies. This effect also reduces the viscosity of stickies and prevents the flocculation of sticky particles. Studies on the chemical composition of stickies have shown that most stickies contain a large number of ester bonds that can connect the basic structural components of the stickies together. The biggest advantage of the bioenzyme control method is that once the ester bond is broken, it is difficult for the basic components of the stickies to repolymerize in the system, and the bioenzyme can be naturally degraded without polluting the environment.

[0005] Chinese patent CN 103061183 A discloses a pulping process for waste paper deinking pulp for making high-grade printing paper, including the following steps: pulping, high-concentration sand removal, coarse screening, medium-concentration sand removal, fine screening, flotation, concentration, thermal dispersion, bleaching, water return and sticky matter treatment; the pulping process is: waste paper and water are placed in a high-concentration hydraulic pulper, 0.1%-1.8% of deinking agent, 0.1%-0.8% of compound biological enzyme and 0.1-2.0% of surfactant are added to the high-concentration hydraulic pulper relative to the absolute dry weight of the waste paper, the pulping concentration is controlled to be 10-20%, the temperature is 50-60°C, the pulping time is 10-30min, and the heat preservation is 0-20min to obtain the deinked pulp after pulping. However, its process is complicated and the ink content (ERIC) removal effect is poor.

[0006] Chinese patent CN 112813716 A relates to a system and method for removing sticky deposits by using a composite bio-enzyme for papermaking, which includes: preparing a solution with a bio-enzyme, crushing waste paper into pulp, adjusting pH and temperature after mixing, enzyme reaction, removing slag, and papermaking. This technical solution is only for the treatment of waste paper stickies and has no effect on deinking.

[0007] Chinese patent CN 101760976 A discloses a waste paper deinking and sticky matter control process, including pulping, high-concentration slag removal, coarse screening, fine screening, pre-flotation, thermal dispersion, bleaching, post-flotation and washing and filtration, 1) adding soap deinking agent KLS-100 during pulping; adding soap deinking agent KLS-100 and polyether surfactant PA300 mixed deinking agent during pre-flotation and post-flotation. 2) adding optimyze525 bioenzyme during washing and filtration, adding resin dispersant B2281 while using the bioenzyme, and controlling the pH value of the pulp at 7.0-7.5 during the addition process. The whiteness of the deinked pulp is increased from the existing 70% ISO to 74% ISO. This is mainly biased towards the improvement of the deinking effect, and the removal effect of stickies is general.

[0008] On the one hand, in the recycling of waste paper, removing stickies and deinking are equally important; on the other hand, being effective for multiple types of waste paper pulp is also lacking in current technical solutions. Based on this, the present invention provides a bio-enzyme composition, which optimizes the type and ratio of bio-enzymes and uses them in combination with organic solvents according to a ratio. The obtained product has the effects of both efficient removal of stickies and deinking, and is effective for multiple types of waste paper pulp. Summary of the invention

[0009] In view of the above problems, the present invention provides a biological enzyme composition, which consists of biological enzymes and organic solvents. By optimizing the biological enzymes and their ratios, the technical effects of both efficient removal of stickies and deinking are achieved.

[0010] To achieve the above purpose, the technical solution adopted by the present invention is as follows:

[0011] In one aspect, the present invention provides a biological enzyme composition comprising lipase, esterase, modified cellulase and polygalacturonase.

[0012] Preferably, the bio-enzyme composition comprises the following components by weight: 4-10 parts of lipase, 2-6 parts of esterase, 1-5 parts of modified cellulase and 5-10 parts of polygalacturonase;

[0013] Further preferably, the bio-enzyme composition comprises the following components by weight: 5-8 parts of lipase, 3-5 parts of esterase, 3-5 parts of modified cellulase and 6-9 parts of polygalacturonase;

[0014] More preferably, the bio-enzyme composition comprises the following components by weight: 6-8 parts of lipase, 3-4 parts of esterase, 3-4 parts of modified cellulase and 6-8 parts of polygalacturonase;

[0015] Most preferably, the bio-enzyme composition comprises the following components by weight: 7 parts of lipase, 4 parts of esterase, 5 parts of modified cellulase and 7 parts of polygalacturonase.

[0016] Preferably, the preparation process of the modified cellulase comprises the following steps: mixing cellulase, glutamine aminotransferase and polyoxyethylene oleate with water, and reacting at 30-60° C. for 1-2 hours;

[0017] Preferably, the mass ratio of the transglutaminase to polyoxyethylene oleate is 1:2.7-3.8; further preferably, the mass ratio of the transglutaminase to polyoxyethylene oleate is 1:3.3-3.8; more preferably, the mass ratio of the transglutaminase to polyoxyethylene oleate is 1:3.4.

[0018] Preferably, the sum of the masses of the transglutaminase and polyoxyethylene oleate is 0.005-0.008 of the mass of the cellulase; further preferably, the sum of the masses of the transglutaminase and polyoxyethylene oleate is 0.006 of the mass of the cellulase.

[0019] Preferably, the temperature of the preparation process of the modified cellulase is 35-55°C, and more preferably, the temperature of the preparation process of the modified cellulase is 48°C.

[0020] Preferably, the preparation time of the modified cellulase is 1.5 h.

[0021] Preferably, the enzyme activity of the modified cellulase is 3500-8000 U / g.

[0022] Preferably, in the biological enzyme composition, the enzyme activity of the lipase is 5000-8000 U / g, the enzyme activity of the esterase is 10000-12000 U / g, and the enzyme activity of the polygalacturonase is 8000-10000 U / g.

[0023] On the other hand, the present invention also provides a bio-enzyme preparation, comprising the bio-enzyme composition described above.

[0024] Preferably, the bioenzyme preparation further comprises an organic solvent, a surfactant and an activator.

[0025] Preferably, the organic solvent is selected from at least one of tetrahydrofuran, decalin, hydroquinone, ethylene glycol carbonate, and N,N-dimethylformamide;

[0026] Further preferably, the organic solvent is selected from at least one of decalin, ethylene glycol carbonate, and N,N-dimethylformamide;

[0027] More preferably, the organic solvent is decalin, ethylene glycol carbonate and N,N-dimethylformamide.

[0028] Preferably, the mass ratio of decalin, ethylene glycol carbonic acid and N,N-dimethylformamide is 0.5-1:1-2:3-4; further preferably, the mass ratio of decalin, ethylene glycol carbonic acid and N,N-dimethylformamide is 0.8-1:1-1.5:3.2-3.6; more preferably, the mass ratio of decalin, ethylene glycol carbonic acid and N,N-dimethylformamide is 1:1.2:3.4.

[0029] Preferably, the mass ratio of the organic solvent to the bio-enzyme composition is 1:2-6; further preferably, the mass ratio of the organic solvent to the bio-enzyme composition is 1:4.

[0030] Preferably, the surfactant is selected from at least one of alkylphenol polyoxyethylene ether, ethylene glycol monobutyl ether, and 2,4,7,9-tetramethyl-4,7-diol-5-decyne; further preferably, the surfactant is selected from at least one of ethylene glycol monobutyl ether and 2,4,7,9-tetramethyl-4,7-diol-5-decyne; more preferably, the surfactant is ethylene glycol monobutyl ether and 2,4,7,9-tetramethyl-4,7-diol-5-decyne.

[0031] Preferably, the mass ratio of ethylene glycol monobutyl ether and 2,4,7,9-tetramethyl-4,7-diol-5-decyne is 1:2-5; further preferably, the mass ratio of ethylene glycol monobutyl ether and 2,4,7,9-tetramethyl-4,7-diol-5-decyne is 1:3.2-4.4; more preferably, the mass ratio of ethylene glycol monobutyl ether and 2,4,7,9-tetramethyl-4,7-diol-5-decyne is 1:3.7.

[0032] Preferably, the activator is selected from at least one of N-benzylidenebenzylamine, naphthylacetic acid, salicylic acid, and ascorbic acid; further preferably, the activator is selected from at least one of N-benzylidenebenzylamine, naphthylacetic acid, and ascorbic acid; more preferably, the activator is N-benzylidenebenzylamine and naphthylacetic acid.

[0033] Preferably, the mass ratio of N-benzylidenebenzylamine to naphthylacetic acid is 0.5-0.8:1-2; further preferably, the mass ratio of N-benzylidenebenzylamine to naphthylacetic acid is 0.6:1.1.

[0034] Preferably, the mass ratio of the surfactant to the bio-enzyme composition is 0.2-0.6:1; further preferably, the mass ratio of the surfactant to the bio-enzyme composition is 0.2-0.4:1; more preferably, the mass ratio of the surfactant to the bio-enzyme composition is 0.3:1.

[0035] Preferably, the mass ratio of the activator to the bio-enzyme composition is 0.1-0.2:1; further preferably, the mass ratio of the activator to the bio-enzyme composition is 0.1-0.15:1; more preferably, the mass ratio of the activator to the bio-enzyme composition is 0.12:1.

[0036] In another aspect, the present invention provides a method for treating stickies and ink in waste paper using the above-mentioned bioenzyme preparation, comprising the following steps:

[0037] S1: Mix the shredded waste paper with water, add surfactant and activator, and stir at 30-40℃ for 0.5-1h;

[0038] S2: adding a bio-enzyme composition and an organic solvent; the temperature is 40-60°C, the pH is 6-8.5, and stirring is performed for 1-2 hours to obtain a mixture; the mass of the bio-enzyme is 0.01%-0.02% of the mass of the waste paper;

[0039] S3: Deslagging, coarse screening, fine screening, flotation and filtering the mixture obtained in S2.

[0040] Preferably, the method comprises the following steps:

[0041] S1: waste paper and aqueous solution are mixed in a pulper, stirred and crushed as pulp, surfactant and activator are added in sequence, stirred at 30°C for 0.5h, heated to 45°C, and kept warm for 20min;

[0042] S2: adding a bio-enzyme composition and an organic solvent; controlling the temperature to 45°C, the pH to 6-7.5, stirring for 1.5 hours to obtain a mixture; the mass of the bio-enzyme is 0.015% of the mass of the waste paper;

[0043] S3: removing slag, coarse screening, fine screening, flotation and filtering the mixture obtained in S2;

[0044] Preferably, the working pressure difference of the coarse screen described in S3 is 28-45KPa, and the slurry inlet pressure is 100-150KPa; further preferably, the working pressure difference of the coarse screen described in S3 is 28-32KPa, and the slurry inlet pressure is 100-130KPa; more preferably, the working pressure difference of the coarse screen described in S3 is 30KPa, and the slurry inlet pressure is 125KPa.

[0045] Preferably, the slurry inlet pressure of the fine screen described in S3 is 220-280KPa; the outlet pressure difference is 35-55KPa; further preferably, the slurry inlet pressure of the fine screen described in S3 is 240-260KPa; the outlet pressure difference is 40-50KPa; more preferably, the slurry inlet pressure of the fine screen described in S3 is 240KPa; the outlet pressure difference is 45KPa.

[0046] Preferably, the flotation temperature in S3 is 40-50°C and the ventilation volume is 10-15m 3 / h, pressure is 1.2-1.5MPa, pH is 7-8, time is 5-15min; further preferably, the flotation temperature in S3 is 50°C, the ventilation volume is 15m 3 / h, pressure is 1.5MPa, pH is 7.5, and time is 5min.

[0047] Preferably, the waste paper comprises #37 waste paper, #8 waste paper and #10 waste paper;

[0048] Further preferably, the waste paper comprises, by mass percentage, 45% #37 waste paper, 25% #8 waste paper and 30% #10 waste paper.

[0049] Compared with the prior art, the present invention has the following beneficial effects:

[0050] 1. The present invention significantly improves the removal effect of adhesives and inks by optimizing the composition and dosage ratio of the biological enzyme composition;

[0051] 2. The present invention modifies cellulase to obtain modified cellulase. During the research process, it was found that the modified cellulase prepared by the present invention and esterase prepared in a specific ratio have a synergistic effect and can significantly improve the removal effect of adhesives and inks.

[0052] 3. The present invention uses a bio-enzyme composition in combination with three organic solvents, DMF, decalin and ethylene glycol carbonate, and can achieve better removal effects of adhesives and inks while reducing the amount of the bio-enzyme composition under the condition of adding a small amount of organic solvent.

[0053] 4. The present invention significantly improves the removal effect of adhesives and inks by using a specific surfactant and an activator in combination with a biological enzyme composition and optimizing the treatment method in the waste paper treatment process. DETAILED DESCRIPTION

[0054] In order to make the technical means, creative features, purpose and effect of the present invention easy to understand, the present invention is further explained below in conjunction with specific embodiments, but the following embodiments are only preferred embodiments of the present invention, not all. Based on the embodiments in the implementation mode, other embodiments obtained by those skilled in the art without making creative work all belong to the protection scope of the present invention. It is worth noting that the raw materials used in the present invention are all common commercial products, and their sources are not specifically limited. The technology and scientific terms used in the embodiments have the meanings commonly understood by those of ordinary skill in the technical field to which the present invention belongs.

[0055] Example 1

[0056] 1) A biological enzyme preparation, comprising the following components in parts by weight:

[0057] 7 parts of lipase, 4 parts of esterase, 5 parts of modified cellulase and 8 parts of polygalacturonase;

[0058] 1.07 parts of decalin, 1.29 parts of ethylene glycol carbonate and 3.64 parts of N,N-dimethylformamide;

[0059] 1.53 parts of ethylene glycol monobutyl ether and 5.67 parts of 2,4,7,9-tetramethyl-4,7-diol-5-decyne;

[0060] 1.01 parts of N-benzylidenebenzylamine and 1.86 parts of naphthylacetic acid.

[0061] The enzyme activity of the modified cellulase is 6000 U / g, the enzyme activity of the lipase is 8000 U / g, the enzyme activity of the esterase is 10000 U / g, and the enzyme activity of the polygalacturonase is 10000 U / g.

[0062] The preparation process of the modified cellulase comprises the following steps: dissolving cellulase (enzyme activity of 3000 U / g) in water to prepare a solution with a mass fraction of 20%, adding glutamine aminotransferase (mass of 1.36‰ of cellulase) and oleic acid polyoxyethylene ester (mass of 4.64‰ of cellulase), adjusting the pH to 6-8.5, heating in a water bath to 48°C, and reacting for 1.5 hours.

[0063] 2) The method for treating stickies and ink in waste paper with the above-mentioned bioenzyme preparation comprises the following steps:

[0064] S1: adding water to a pulper, crushing waste paper (consisting of 45% #37 waste paper, 25% #8 waste paper and 30% #10 waste paper) and placing it in the pulper, stirring and crushing for 30 minutes as pulp, adding ethylene glycol monobutyl ether, 2,4,7,9-tetramethyl-4,7-diol-5-decyne, 1.01 parts of N-benzylidenebenzylamine and naphthylacetic acid in sequence, mechanically stirring at 30°C for 0.5h, then heating to 45°C and keeping warm for 20min;

[0065] S2: adding lipase, esterase, modified cellulase, polygalacturonase, decalin, ethylene glycol carbonate and N,N-dimethylformamide; controlling the temperature to 45°C, the pH to 6-7.5, and mechanically stirring for 1.5 hours to obtain a mixture; the total mass of the bio-enzyme composition is 0.015% of the mass of the waste paper;

[0066] S3: subjecting the mixture obtained in S2 to a slag removal step to remove fiber slag decomposed by the bio-enzyme composition;

[0067] After deslagging, the mixture is coarsely screened. The working pressure difference of the coarse screen is 30KPa, and the slurry inlet pressure is 125KPa.

[0068] Then the mixture is finely screened, the inlet pressure of the fine screen is 240KPa, and the outlet pressure difference is 45KPa;

[0069] The mixture then enters the flotation tank for flotation. The flotation temperature is 50°C and the ventilation volume is 15m 3 / h, pressure 1.5MPa, pH 7.5, time 5min;

[0070] Finally, the mixture was filtered through a 120-mesh sieve to obtain the product.

[0071] Example 2

[0072] Compared with Example 1, only the components of the biological enzyme preparation in 1) are changed, specifically as follows:

[0073] 1) A biological enzyme preparation, comprising the following components in parts by weight:

[0074] 10 parts of lipase, 2 parts of esterase, 2 parts of modified cellulase and 10 parts of polygalacturonase;

[0075] 1.78 parts of decalin, 2.22 parts of ethylene glycol carbonate and 8 parts of N,N-dimethylformamide;

[0076] 1.6 parts of ethylene glycol monobutyl ether and 3.2 parts of 2,4,7,9-tetramethyl-4,7-diol-5-decyne;

[0077] 0.8 parts of N-benzylidenebenzylamine and 1.6 parts of naphthylacetic acid.

[0078] Example 3

[0079] Compared with Example 1, only the components of the biological enzyme preparation in 1) are changed, specifically as follows:

[0080] 1) A biological enzyme preparation, comprising the following components in parts by weight:

[0081] 4 parts of lipase, 6 parts of esterase, 1 part of modified cellulase and 5 parts of polygalacturonase;

[0082] 0.76 parts of decahydronaphthalene, 1.51 parts of ethylene glycol carbonate and 3.03 parts of N,N-dimethylformamide;

[0083] 1.6 parts of ethylene glycol monobutyl ether and 8 parts of 2,4,7,9-tetramethyl-4,7-diol-5-decyne;

[0084] 0.23 parts of N-benzylidenebenzylamine and 2.28 parts of naphthylacetic acid.

[0085] Example 4

[0086] Compared with Example 1, only the parameters in 2) are changed, as follows:

[0087] 2) The method for treating stickies and ink in waste paper with the above-mentioned bioenzyme preparation comprises the following steps:

[0088] S1: adding water to a pulper, crushing waste paper (consisting of 45% #37 waste paper, 25% #8 waste paper and 30% #10 waste paper) and placing it in the pulper, stirring and crushing for 30 minutes as pulp, adding ethylene glycol monobutyl ether, 2,4,7,9-tetramethyl-4,7-diol-5-decyne, 1.01 parts of N-benzylidenebenzylamine and naphthylacetic acid in sequence, mechanically stirring at 30°C for 0.5h, then heating to 45°C and keeping warm for 20min;

[0089] S2: adding lipase, esterase, modified cellulase, polygalacturonase, decalin, ethylene glycol carbonate and N,N-dimethylformamide; controlling the temperature to 35°C, the pH to 6-7.5, and mechanically stirring for 2 hours to obtain a mixture; the total mass of the bio-enzyme composition is 0.015% of the mass of the waste paper;

[0090] S3: subjecting the mixture obtained in S2 to a slag removal step to remove fiber slag decomposed by the bio-enzyme composition;

[0091] After slag removal, the mixture is coarsely screened, the working pressure difference of the coarse screen is 45KPa, and the slurry inlet pressure is 100KPa;

[0092] Then the mixture is finely screened, the inlet pressure of the fine screen is 280KPa, and the outlet pressure difference is 35KPa;

[0093] The mixture then enters the flotation tank for flotation. The flotation temperature is 40°C and the ventilation volume is 10m 3 / h, pressure 1.2MPa, pH 7, time 10min;

[0094] Finally, the mixture was filtered through a 120-mesh sieve to obtain the product.

[0095] Comparative Example 1

[0096] Compared with Example 1, only the composition of the biological enzyme was changed, as follows:

[0097] 1) A biological enzyme preparation, comprising the following components in parts by weight:

[0098] 1 part of lipase, 10 parts of esterase, 10 parts of modified cellulase and 3 parts of polygalacturonase.

[0099] Comparative Example 2

[0100] Compared with Example 1, only the composition of the biological enzyme was changed, and polygalacturonase was replaced by lipase, as follows:

[0101] 15 parts of lipase, 4 parts of esterase, 5 parts of modified cellulase.

[0102] Comparative Example 3

[0103] Compared with Example 1, only the composition of the biological enzyme was changed, and the modified cellulase was replaced by esterase, as follows:

[0104] Lipase 7 parts, esterase 9 parts and polygalacturonase 8 parts.

[0105] Comparative Example 4

[0106] Compared with Example 1, only the composition of the biological enzyme was changed, and the esterase was replaced by the modified cellulase, as follows:

[0107] Lipase 7 parts, modified cellulase 9 parts and modified cellulase 13 parts.

[0108] Comparative Example 5

[0109] Compared with Example 1, only the preparation method of the modified cellulase was changed, specifically:

[0110] The preparation process of the modified cellulase comprises the following steps: dissolving cellulase (enzyme activity of 1000 U / g) in a phosphate buffer solution with a pH of 7.2 to obtain a cellulase solution, wherein the mass fraction of the cellulase in the cellulase solution is 2%, adding 0.2% of N-hydroxysuccinimide, stirring for 3 minutes, and then slowly adding 1% of a mixed amine, wherein the mixed amine is a mixture of diethylenetriamine and 1,6-hexanediamine, and the mass ratio of the two is 1.5:1, reacting for 3 hours under stirring conditions at 30° C., dialyzing to remove unreacted mixed amine and N-hydroxysuccinimide, and freeze-drying the remaining solution to obtain the modified cellulase.

[0111] Comparative Example 6

[0112] Compared with Example 1, only the composition of the biological enzyme was changed, as follows:

[0113] 5 parts of amylase, 2 parts of laccase, 5 parts of modified cellulase, 6 parts of xylanase, and 1 part of lipase.

[0114] Comparative Example 7

[0115] Compared with Example 1, only the amount of the organic solvent was changed, specifically:

[0116] 0.5 parts of decalin, 6 parts of ethylene glycol carbonate and 8 parts of N,N-dimethylformamide.

[0117] Comparative Example 8

[0118] Compared with Example 1, only the amount of the organic solvent was changed, specifically:

[0119] 2.7 parts of decalin and 9.3 parts of N,N-dimethylformamide.

[0120] Comparative Example 9

[0121] Compared with Example 1, only the amount of the organic solvent was changed, specifically:

[0122] 5.45 parts of decalin and 6.55 parts of ethylene glycol carbonate.

[0123] Comparative Example 10

[0124] Compared with Example 1, only the amount of the organic solvent was changed, specifically:

[0125] 3.13 parts of ethylene glycol carbonate and 8.87 parts of N,N-dimethylformamide.

[0126] Comparative Example 11

[0127] Compared with Example 1, only the organic solvent was changed, specifically:

[0128] 38 parts of an organic solvent, which is a mixed solvent of ethanol, n-butanol and polyethylene glycol, with a volume ratio of the three being 2:1:1.

[0129] Comparative Example 12

[0130] Compared with Example 1, only the amount of the surfactant was changed, specifically:

[0131] 6 parts of ethylene glycol monobutyl ether and 1.1 parts of 2,4,7,9-tetramethyl-4,7-diol-5-decyne.

[0132] Comparative Example 13

[0133] Compared with Example 1, only the amount of the surfactant was changed, specifically:

[0134] 7.1 parts of ethylene glycol monobutyl ether.

[0135] Comparative Example 14

[0136] Compared with Example 1, only the amount of the activator was changed, specifically:

[0137] 2 parts of N-benzylidenebenzylamine and 0.87 parts of naphthylacetic acid.

[0138] Comparative Example 15

[0139] Compared with Example 1, only the amount of the activator was changed, specifically:

[0140] 2.87 parts of naphthylacetic acid.

[0141] Comparative Example 16

[0142] Compared with Example 1, only the parameters in 2) are changed, as follows:

[0143] 2) The method for treating stickies and ink in waste paper with the above-mentioned bioenzyme preparation comprises the following steps:

[0144] S1: adding water to a pulper, crushing waste paper (consisting of 45% #37 waste paper, 25% #8 waste paper and 30% #10 waste paper) into pulp, stirring and crushing for 40 minutes as pulp, adding ethylene glycol monobutyl ether, 2,4,7,9-tetramethyl-4,7-diol-5-decyne, 1.01 parts of N-benzylidenebenzylamine and naphthylacetic acid in sequence, stirring mechanically at 60°C for 2.5 hours, then heating to 45°C and keeping warm for 20 minutes;

[0145] S2: adding lipase, esterase, modified cellulase, polygalacturonase, decalin, ethylene glycol carbonate and N,N-dimethylformamide; controlling the temperature to 20°C, the pH to 6-7.5, and mechanically stirring for 2 hours to obtain a mixture; the total mass of the bio-enzyme composition is 0.03% of the mass of the waste paper;

[0146] S3: subjecting the mixture obtained in S2 to a slag removal step to remove fiber slag decomposed by the bio-enzyme composition;

[0147] After deslagging, the mixture is coarsely screened. The working pressure difference of the coarse screen is 25KPa, and the slurry inlet pressure is 160KPa.

[0148] Then the mixture is finely screened, the inlet pressure of the fine screen is 200KPa, and the outlet pressure difference is 30KPa;

[0149] The mixture then enters the flotation tank for flotation. The flotation temperature is 60°C and the ventilation volume is 20m 3 / h, pressure 2MPa, pH 7, time 20min;

[0150] Finally, the mixture was filtered through a 120-mesh sieve to obtain the product.

[0151] Test Example 1

[0152] 1. Measurement of whiteness and residual ink: Collect the filtered pulp and make sheets on a standard paper former (quantity 200g / m 2 ), measure whiteness and ink residue.

[0153] 2. Sticky matter removal rate: measure the average sticky matter area S1 per unit mass of waste paper before treatment, and then measure the average sticky matter area S2 per unit mass of waste paper after filtration and drying;

[0154] Adhesive removal rate % = S2 / S1*100%.

[0155] 3. Determination of large stickies: Measure 2 g of the filtered slurry with an absolute dry content, and after delamination, screen it in the Pulmac Master Screen stickies sieving instrument, stain it, press it into tablets, and then scan it and analyze it using the instrument's own software.

[0156] 4. Determination of fine adhesives: Measure 200 mL of the filtered slurry, centrifuge at 5000 rpm for 15 min, take the supernatant, filter it on a 0.22 um ultrafiltration membrane, and then weigh it after constant weight.

[0157] The control group was treated without adding the bio-enzyme preparation, and the rest was the same as in Example 1, specifically as follows:

[0158] The method for treating stickies and ink in waste paper comprises the following steps:

[0159] S1: Add water to the pulper, crush the waste paper (consisting of 45% #37 waste paper, 25% #8 waste paper and 30% #10 waste paper) and place it in the pulper, stir and crush for 30 minutes to make pulp, mechanically stir at 30°C for 0.5h, then heat to 45°C and keep warm for 20min;

[0160] S2: Control the temperature to 45°C, pH to 6-7.5, and mechanically stir for 1.5h to obtain a mixture;

[0161] S3: subjecting the mixture obtained in S2 to a slag removal process to remove decomposed fiber slag;

[0162] After deslagging, the mixture is coarsely screened. The working pressure difference of the coarse screen is 30KPa, and the slurry inlet pressure is 125KPa.

[0163] Then the mixture is finely screened, the inlet pressure of the fine screen is 240KPa, and the outlet pressure difference is 45KPa;

[0164] The mixture then enters the flotation tank for flotation. The flotation temperature is 50°C and the ventilation volume is 15m 3 / h, pressure 1.5MPa, pH 7.5, time 5min;

[0165] Finally, the mixture was filtered through a 120-mesh sieve to obtain the product.

[0166] The results are shown in Table 1 below:

[0167] Table 1.

[0168]

[0169]

[0170] From the data in Table 1, it can be seen that the deinking effect and the effect of removing stickies obtained by the technical solution of the present invention are significantly better than those of the control example by optimizing the composition and dosage ratio of the bio-enzyme composition, modifying the cellulase to obtain modified cellulase, using the bio-enzyme composition in combination with three organic solvents: DMF, decalin, and ethylene glycol carbonate, and combining a specific surfactant and an activator with the bio-enzyme composition.

[0171] Finally, it should be noted that the above content is only used to illustrate the technical solution of the present invention, rather than to limit the scope of protection of the present invention. Simple modifications or equivalent substitutions of the technical solution of the present invention by ordinary technicians in this field do not deviate from the essence and scope of the technical solution of the present invention.

Claims

1. A biological enzyme preparation, characterized in that: The invention comprises a biological enzyme composition, an organic solvent, a surfactant and an activator; The biological enzyme composition comprises the following components by weight: 4-10 parts of lipase, 2-6 parts of esterase, 1-5 parts of modified cellulase and 5-10 parts of polygalacturonase; The preparation process of the modified cellulase comprises the following steps: mixing cellulase, glutamine aminotransferase and polyoxyethylene oleate with water, reacting at 30-60°C for 1-2h, wherein the mass ratio of the glutamine aminotransferase to the polyoxyethylene oleate is 1:2.7-3.8, and the sum of the mass of the glutamine aminotransferase and the polyoxyethylene oleate is 0.005-0.008 of the mass of the cellulase; The organic solvent is composed of decalin, ethylene glycol carbonate and N,N-dimethylformamide; The surfactant is composed of ethylene glycol monobutyl ether and 2,4,7,9-tetramethyl-4,7-diol-5-decyne; The activator is composed of N-benzylidenebenzylamine and naphthylacetic acid; The mass ratio of the organic solvent to the biological enzyme composition is 1:2-6; The mass ratio of the surfactant to the biological enzyme composition is 0.2-0.6:1; The mass ratio of the activator to the biological enzyme composition is 0.1-0.2:

1.

2. The biological agent according to claim 1, characterized in that The biological enzyme composition comprises the following components by weight: 5-8 parts of lipase, 3-5 parts of esterase, 3-5 parts of modified cellulase and 6-9 parts of polygalacturonase.

3. The method for treating stickies and ink in waste paper using a bioenzyme preparation according to any one of claims 1 to 2, characterized in that: The following steps are involved: S1: Mix the shredded waste paper with water, add surfactant and activator, and stir at 30-40℃ for 0.5-1h; S2: adding a bio-enzyme composition and an organic solvent; the temperature is 40-60°C, the pH is 6-8.5, and stirring is performed for 1-2 hours to obtain a mixture; the mass of the bio-enzyme is 0.01%-0.02% of the mass of the waste paper; S3: Deslagging, coarse screening, fine screening, flotation and filtering the mixture obtained in S2.

4. The method according to claim 3, characterized in that The working pressure difference of the coarse screen described in S3 is 28-45KPa, and the slurry inlet pressure is 100-150KPa; The slurry inlet pressure of the fine screen described in S3 is 220-280KPa, and the outlet pressure difference is 35-55KPa; The flotation temperature in S3 is 40-50°C and the ventilation volume is 10-15m 3 / h, pressure is 1.2-1.5MPa, pH is 7-8, and time is 5-15min.

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