KR20130058921A - Production method of solubility pulp made from dioscorea batatas - Google Patents

Abstract

PURPOSE: A method for fabricating pulp derived from Dioscorea batatas for dissolution is provided to enhance production yield and to minimize discharge of environmental pollutant by treating Dioscorea batatas with antibacterial and deodorizing functions with microorganisms and preparing pulp. CONSTITUTION: A method for fabricating pulp derived from Dioscorea batatas for dissolution comprises: a step of removing seeds and leaves from Dioscorea batatas; a step of transversely cutting Dioscorea batatas; a step of screening and washing(101); a step of peeling to obtain a stalk(102); a step of cutting the stalk and preparing hair chip(103); a step of injecting white rot fungi to the hair chip(104); a step of adding water or steam, and sulfur dioxide or sulfuric acid to the hair chip and dissolving hemicellulose(105); a step of putting the hair chip to a digester, and digesting in a liquid containing water, alkali, and anthraquinone at high temperature(106); a step of removing foreign materials(107); a step of adding the digester and digesting undigested parts and selecting(108); a step of washing selected parts to remove the liquid and concentrating(109); a step of bleaching the pulp(110); a step of treating the pulp with acid, and washing to remove metal ions(111); and a step of rolling the pulp(112). [Reference numerals] (101) Pre-treat; (102) Peel; (103) Finely cut; (104) Treat microorganisms; (105) Pre-hydrolyze; (106) Cook; (107) Dedust; (108) Refine; (109) Wash and concentrate; (110) Bleach; (111) Treat with acid/Wash; (112) Manufacture a roll; (AA) No; (BB) Yes

Description

Production Method of Solubility Pulp Made From Dioscorea batatas

The present invention generally relates to a method for producing a dissolving pulp produced using hemp (Dioscorea batatas), more specifically, so that the content of lignin contained in hemp, which is a non-wood plant, less than wood pulp. The present invention relates to a method for producing a pulp for dissolving hemp derived from hemp, which can produce pulp by treating microorganisms, thereby producing a high yield and minimizing the emission of environmental pollutants.

Paper and melting pulp is generally known to be produced using wood. The dissolving pulp refers to the pulp for fibers, and refers to the pulp that can be produced from the rayon-based fibers using the dissolving pulp.

Until recently, most of the world's wood pulp and its lack of wood resources have made it necessary to produce paper stock pulp (partly fiber stock pulp) while protecting forests and maintaining the environment. Efforts are being made to produce pulp from wood plant fibers and the like.

In the case of such non-wood plants, cotton, hemp, flax, jute, jute, manila hemp, cedars, straw, esparto, bamboo, vargas, zpsign, etc. are used, and Korean Patent Publication Nos. 98-9651 and 93-2604 Has presented a method for producing pulp using rice straw, and Korean Patent Registration 10-0647491 discloses a method for producing pulp using bamboo.

However, conventional pulp production methods using these non-wood plants have a high content of lignin, which is an impurity in the case of non-wood pulp, and has a limitation in that a large amount of chemicals must be used to remove them. Accordingly, there is a problem that there is a great possibility of environmental pollution because the amount of waste water generated compared to wood pulp, and also because the pulp yield is low, there is a problem that economic efficiency is low.

Recently, dissolving pulp is produced in China and Japan using bamboo and corn, but pulping is not satisfactory, it has high chemical and energy consumption, bleaching treatment under strong conditions, low yield, and breakdown and destruction of fiber. It causes weak fibers.

In the prior art, the kraft pulping method is generally adopted, but as the pollution problem arises, the kraft pulping method also faces various difficulties. In particular, odor problems, waste liquid treatment problems, and social problems due to water pollution that occur during the cooking process are being highlighted.

In addition, the chlorine bleaching process in the bleaching process provides a cause of the generation of dioxin, and using bleaching powder as a bleaching chemical has many problems in the durability of the manufacturing apparatus. Therefore, this process problem acts to increase the amount of chemical input, energy consumption and production cost per pulp production.

Therefore, there is still an urgent need for an economical and environmentally friendly production technology while increasing the production yield in the technology for producing dissolving pulp using non-wood plants.

The present invention has been made to solve the problems of the prior art described above and to add a number of other advantages, in particular, the present inventors use non-wood such as hemp if using a lignin degrading enzyme that can be separated from the mushrooms growing in domestic forests When pulping plants, the researchers noted that not only can they significantly reduce the use of chemicals to remove lignin and hemicellulose, but also that pulp yields can be expected to increase.

And the present inventors believe that the new pulping method to be developed should be (1) pollution-free in terms of manufacturing principle, (2) there should be no fear of generating secondary pollution, and (3) replaceable to existing pulp in terms of quality. It should be considered that (4) the energy cost should be less than that of the existing pulp, and (5) the production cost should be about the same as the mechanical pulp.

Therefore, the present invention is to provide a method for producing a new hemp-derived dissolving pulp that can minimize the discharge of environmental pollutants by producing a pulp by treating the non-wood plant with antimicrobial deodorant function using microorganisms and manufacturing pulp. For that purpose.

The above object is achieved by a method for preparing hemp derived dissolving pulp provided according to the present invention.

Method for producing a hemp-derived pulping pulp provided in accordance with an aspect of the present invention, after removing the seeds and leaves in the hemp, a pretreatment step of cutting, screening and washing horizontally; A peeling step of removing the skin of the hemp obtained in the pretreatment step and injecting the peeler to obtain the inner skin; A cutting step of producing a hair chip (Hair Chip) by horizontally cutting the inner core of the hemp obtained in the peeling step to a length of 0.3m ~ 0.5m and then vertically cut to a thickness of 1.5mm ~ 1mm; Microbial treatment step of injecting white fungi as a microorganism to decompose lignin to the hair chip obtained in the cutting step; A pre-hydrolysis step of dissolving hemicellulose by adding water, steam, sulfur dioxide or sulfuric acid to the hair chip treated with the lignin-decomposing microorganisms in the microbial treatment step; The hair chip treated in the pre-hydrolysis step is administered to the cooking section (digest), and the ratio of the chemical weight composed of water, alkali, and anthraquinone, that is, the liquid ratio is 1: 2.5 to 3.0 (MA: chemical solution). Cooking step of pulping by cooking at high temperature; A dust removal step of removing foreign matter from the pulping in the cooking step by using a centrifugal damper; A selection step of removing foreign matters using a pressure screen to remove foreign matters in the dust removing step, and putting the portions of which are less cooked into the cooking part (digestor); Washing and concentrating the pulverized medicinal solution by using a decker selected in the selection step, squeezing water and concentrating to obtain pulp; Bleaching the pulp obtained in the washing and concentrating step; An acid treatment and washing step of removing metal ions present on the surface and inside of the pulp obtained in the bleaching step; And a roll manufacturing step of manufacturing the pulp obtained in the acid treatment and washing step into a roll.

In one embodiment, the pre-hydrolysis step, it is possible to pre-hydrolyze in a state in which the liquid ratio (weight ratio) of the liquid containing water and the hair chip is 1.0 ~ 1.3.

In another embodiment, the cooking step, the weight of the alkali added to the water is 5% to 8% of the weight of the dry hair (pure mass excluding the moisture contained in the hair chip) hair chip and the weight of anthraquinone (AQ) 0.05-0.1%, cooking temperature is 110-130 degreeC, and the cooking time can be performed in the range of 50 minutes-70 minutes.

In another embodiment, in the bleaching step, the oxygen bleaching method may be applied and magnesium may be added in a weight of 0.05% to 0.1% based on the total weight of the dried pulp to prevent viscosity reduction.

In another embodiment, the unbleached pulp may be treated with nitrogen dioxide in oxygen to increase the lignin removal rate to 80% during the oxygen bleaching process.

In another embodiment, the acid treatment and washing step, the pH is adjusted to within the range of 3.5 to 5.5, acid treatment at room temperature for 15 minutes to 50 minutes, and then washed with clean water until the pH is neutral.

And in another embodiment, the roll is manufactured in the roll manufacturing step is preferably made of a roll of 0.5mm ~ 1.0mm thick paper is wound.

According to the present invention having the above-described configuration, by treating the non-wood plant with antimicrobial deodorant function using microorganisms and preparing the pulp provides a significant effect, such as high production yield and minimize the emission of environmental pollutants can do.

The present invention described in the present specification by cutting the non-wood plant hemp to produce a hair chip (Hair Chip) treated with lignin-decomposing microorganisms, so that the pre-hydrolysis and cooking is easy to proceed. Accordingly, it is possible to produce an eco-friendly melting ecopulp that reduces chemical consumption and reduces environmental pollution. Furthermore, the soda-AQ method using anthraquinone as a catalyst in the cooking process can be applied to the pulping of hemp. Therefore, it is an improvement in pulping pulping technology that has the advantages of effective ligignin, quality improvement and yield, energy consumption and oxygen bleaching method to reduce the environmental pollution. Provide technology.

Furthermore, the present invention provides a dissolution ecopulp using a non-wood plant and a pesticide-free hemp, and the lignin content, which is an impurity in the manufacture of pulp contained in hemp by administering lignin-decomposing microorganisms, relative to wood pulp. To reduce the chemical and energy consumption by reducing the density of the pulp, it is possible to reduce the chemicals and energy consumption by cutting the hemp into thick hair, that is, hair chips, instead of the conventional chips to facilitate the pre-hydrolysis and cooking. In order to minimize harmful substances such as dioxins, which may occur during the bleaching process, and therefore, in terms of the effect of not cutting wood and the economic, functional, and qualitative characteristics of the wood pulp itself. Differentiated superiority from non-wood pulp.

1 is a flow chart illustrating a manufacturing process of hemp-derived dissolution pulp according to an embodiment of the present invention.
2 and 3 are schematic diagrams illustrating apparatuses used in the manufacturing process of hemp derived dissolving pulp according to an embodiment of the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS The advantages and features of the present invention and the manner of achieving them will become apparent with reference to the embodiments described in detail below with reference to the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but can be implemented in various different forms, only the embodiments are to make the disclosure of the present invention complete, and the general knowledge in the technical field to which the present invention belongs It is provided to fully convey the scope of the invention to those skilled in the art, and is defined by the claims of the present invention.

In describing the embodiments of the present invention, when it is determined that a detailed description of a known function or configuration may unnecessarily obscure the gist of the present invention, the detailed description thereof will be omitted. The following terms are defined in consideration of the functions in the embodiments of the present invention, which may vary depending on the intention of the user, the intention or the custom of the operator. Therefore, the definition should be based on the contents throughout this specification.

Hereinafter, a method of preparing hemp-derived pulp according to a specific embodiment of the present invention will be described with reference to the drawings.

The method for producing hemp-based dissolving pulp provided by the present invention is a method for producing a dissolving (fiber) pulp produced using a hemp, and as shown in the flowchart of FIG. 1, the method 100 is a pretreatment step ( 101), peeling step 102, cutting step 103, microbial treatment step 104, pre-hydrolysis step 105, cooking step 106, dust removal step 107, selection step 108, washing And processes such as concentration step 109, bleaching step 110, acid treatment and washing step 111, and roll manufacturing step 112.

Looking at each step in more detail as follows.

In the pretreatment step 101 as a first step, seeds and leaves are removed from the hemp and collected if necessary. It is preferable to use what grew here 3m or more. Seeds and leaves are cut to a suitable length, and screened and washed to remove foreign substances.

Hemp leaves contain a lot of extracts that are not necessary to make dissolving pulp, while they contain very little fiber. Therefore, the leaves are removed before being put into the production process of the dissolving pulp because it is likely to act as a cause to increase the consumption of the drug rather than to help the production of pulp.

The harvested seeds can be used as raw materials for cosmetics and health foods to increase economic efficiency.

Seed and leaf removed hemp stalks are preferably cut into 0.3-0.5m long for efficient screening and cleaning.

The cut hemp stem goes through a step of removing and cleaning foreign matter attached to the stem.

This pretreatment process is intended not to impede the reaction of the drug in the subsequent pulping process and to not increase drug consumption.

Thereafter, as a second step, the stem is subjected to the peeling step 102 for separating the stem into the shell. In other words, hemp stem is put into the peeler to make pulp using a fiber-rich bundle. The shell can be used as a building material for eco-friendly insulation and asbestos substitute through the refining process. Therefore, only the core of hemp is used for pulping in the present invention.

After the core is dried, it goes through a cutting step 103 as a third step.

In order to enhance the reaction effect of the lignin-decomposing microorganism, which is the next step, in the cutting step 103, the genus is cut into a thick hair form, that is, a hair chip form, rather than a general chip form.

More specifically, 0.3m to 0.5m horizontally cut and then 0.5mm to 1mm vertically cut to form a thick hair. This is to increase the surface area to facilitate the microbial reaction. Hereinafter, it is called hair chip.

The microbial treatment step 104 is then passed as a fourth step. In this case, the microorganisms in particular inject microorganisms that degrade lignin, which can be said to be a pretreatment process to facilitate the full hydrolysis and cooking process, which is a full-scale pulping process.

Lignin-degrading microorganism according to the present invention uses white fungus. White fungus has the advantage of degrading hemicellulose while simultaneously degrading lignin. In general, the dissolving pulp must be removed to hemicellulose for pulp bleaching. White fungus can secrete lignin-like environmental hormones by releasing laccase, lignin peroxidase, and manganese peroxidase, which are factors that degrade lignin.

White fungi are well known as microorganisms that secrete lignin degrading enzymes that have the ability to degrade lignin. In addition, Korean Patent Registration No. 10-0995986 "transformation vector of winter umbrella" is disclosed in the preparation of the vector transformed from the winter umbrella, and transformed from the white fungi, as described above By separating and transforming lignin-degrading enzyme genes from mushrooms growing in forests in Korea, white fungi with 3-4 times better lignin-degrading ability than wild mushrooms are being developed. The transformed microorganisms previously developed degraded about 80% of nonylphenol, a representative environmental hormone, and reduced toxic substances to less than 20%. In the present invention, there is a significant significance in that the dissolution pulp manufacturing process is treated with an environmentally friendly process by introducing a method for removing impurities using a microbial culture medium.

Thus, by passing through the microbial treatment step 104 according to the present invention, as well as reducing the consumption of chemicals in the pre-hydrolysis and cooking process as well as faster reaction, it can be a more environmentally friendly pulp process with higher quality and higher yield.

Then, the pre-hydrolysis step 105 proceeds as a fifth step. In this step, the microorganism-treated hemp hair chips are introduced with water or steam for pre-hydrolysis, and sulfuric acid or sulfuric acid is added according to the required degree of pre-hydrolysis to promote pre-hydrolysis, thereby reducing hemicellulose. Melt it.

That is, hydrolysis is performed to elute hemicellulose while maximizing the yield of the dissolving (fiber) pulp in the cork.

For this hydrolysis, it is generally hydrolyzed with liquid water or steam, and sulfur dioxide (sulfur dloxide) or sulfuric acid (sulfuric acid) is used as the catalyst.

The purpose of this prehydrolysis is to dissolve the hemicellulose in the inner pack, so if the acid is used alone, the acid hydrolysis can occur so severely that the cellulose can be severely destroyed.

Therefore, it should be used after being closely observed and adjusted according to the process situation at an appropriate ratio. This process has a significant effect on the yield of pulp.

In the fourth step, the microbial treatment step 104, the lignin decomposing microorganisms are added to the hemp hair chips, thereby reducing the content of lignin, which has a primary effect on the yield and quality of the pulp. Will affect.

Herein, the liquid ratio, that is, the administration of the liquid water and the catalyst, and the administration ratio (weight ratio) of the hemp are adjusted within the range of 1.0 to 1.3: 1 depending on the degree of hydrolysis required. That is, it is preferable to pre-hydrolyze in the state where the liquid ratio of the liquid containing water and hemp is 1.0-1.3.

It should be noted that during the total hydrolysis, organic acids are generated as hemicellulose is decomposed in the chemical composition constituting the hemp, which leads to hydrolysis of the hemp.

Therefore, the higher the liquid ratio is to be controlled according to the degree of polymerization, the degree of hydrolysis of hemicellulose, using the characteristic that the hydrolysis proceeds slowly.

The liquid ratio (liquor ratio) is that when the weight of the hemp (oven dry weight: 1) is 1.0 ~ 1.3 of the weight of the aqueous solution (if the drug is dissolved in water if the drug such as catalyst is included) .

By controlling the liquid ratio, the degree of uniform contact between the hemp hair chip and the chemical liquid during the reaction can be controlled, and also the strength (concentration) of the chemical liquid in contact with the hemp can be changed depending on the degree of liquid ratio. Therefore, controlling the liquid ratio can control the degree of reaction.

Here, the present invention is different from the conventional wood and non-wood pulping process because it does not proceed in the form of bulky and weighty chips, but instead of cutting the coarse hemp and replacing the chips in the form of coarse hair (aka hair Chip) It has a large surface area and light contact with chemical solution, so it has less chemical solution used for hydrolysis. Therefore, it is less environmentally friendly because it contains less sulfuric acid or sulfur dioxide than other methods.

In other words, the amount of chemical liquids that cause environmental pollution is significantly reduced, which is meaningful in that it is an eco-friendly process that can reduce economic pollution and environmental pollution.

The temperature required for the decomposition conditions in the pre-hydrolysis step 105 is set to 80 ~ 120 ℃ and the time of hydrolysis is adjusted in the time range of 20 minutes to 30 minutes.

Thereafter, in the cooking step 106 as a sixth step, a liquid ratio representing the ratio of the chemical liquid composed of water, alkali, and anthraquinone to the hemp weight is administered to the cooking part (digest) by administering the pre-hydrolyzed hemp hair chip in the fifth step. It is 1: 2.5 ~ 3.0 (M: chemical solution) and cooked at high temperature to soften the hemp and pulp.

When the conventional sulfurous acid method is used for the cooking of hemp, there is a problem that the fiber is weak and the pulp yield is low.

Therefore, the present invention applies the soda-AQ method not only to promote ligignin but also to prevent degradation of alpha cellulose and to increase the yield of pulp.

In other words, the soda-AQ method is a solution containing 2.5 to 3.0: 1 liquid to dry weight and liquid containing alkali (mainly NaOH), anthraquinone and water.

Sodium hydroxide (NaOH) acts on the reaction with lignin, the dissolution of hemicellulose, the neutralization of organic acids present in the pot and the organic acids produced during cooking, and the saponification of the resin.

De-lignin by sodium hydroxide breaks down some of the molecules of lignin to form sodium salts and then soluble lignin.

Sodium hydroxide, on the other hand, oxidizes lignin to make carboxyl groups and affects the dissolution of lignin.

In addition, the weight of the alkali (in terms of Na ₂ O) added to water in the soda-AQ method is 5% to 8% of the total weight of the gun drying (pure mass excluding water contained in the horse), and the anthraquinone is the total drying. The weight ratio is 0.05% to 0.1% by weight. Since it is a hair chip, it is much smaller than hardwood wood chips.

Sodium sulfide reacts with water to form sodium hydroxide and sodium hydrogen sulfide (Na2S + H2o = NaOH + NaSH)

Sodium hydrogen sulfide can not de-lignin, but promotes the cleavage of phenylether bonds in lignin, affecting lignin dissolution.

And in this cooking step 106, the cooking temperature is 110 ~ 130 ℃, the cooking time is performed in the range of 50 minutes to 70 minutes, the energy cost can be reduced than other pulping process.

As described above, the present invention is different from other pulp processes in that the energy consumption of the drug is reduced because the cooking process is performed in the fifth step with the microorganism-treated hemp hair chips to reduce the amount of lignin in the fourth step.

Then, the seventh step, the damping step 107 is carried out. In the vibration removing step 107, foreign matter introduced with the hemp is removed using a centric cleaner.

That is, in order to remove the foreign matter introduced with the hemp or introduced into the process, the foreign matter is removed through the centrifugal dust collector 10 shown in FIG. 2.

Referring to this centrifugal vibration damper 10, as shown in Figure 2, a conical device for removing foreign matter from the pulp produced in the cooking step 106, the previous step. Mainly foreign matters to be removed are sand, metal chips and glass chips that can be mixed in each step. Centrifugal dust collectors are focused on the fact that when the pulp is fully wetted, the specific gravity is close to one, while the foreign matters mentioned above are higher than one. Contaminants are removed from the pulp and paper by centrifugal force and shearing of the fluid, so the contaminants are separated and removed not only by the difference in weight but also to some extent by the shape of the particles.

Therefore, when the pulp is supplied to the inlet portion 11 of FIG. 2, the pulp is moved along the inner wall of the centrifugal decompressor by the force of the pump to move to the lower portion 13. By this action, the relatively light pulp moves inwards and exits to the upper part 12, and heavy foreign matter moves outwards and exits to the lower part 13.

The illustrated centrifugal vibration damper 10 is well known, and the present invention is not limited thereto, and it is apparent that various other types of centrifugal vibration dampers may be used.

Thereafter, as an eighth step, the selection step 108 proceeds. In this selection step 108, the foreign matter is removed from the pulp cooked and dedusted in the previous step by using a pressure screen, and the less-digested portion is sent back to the cooking part (digestor) for cooking step 106 and dust removing step. (107) is to be repeated.

As shown in FIG. 3 (a), the pressure screen has a high processing capacity per unit and is completely enclosed, thereby preventing the inflow of air and minimizing the occurrence of slime. It also occupies a small area and has economic advantages in pipe installation and pulp conveyance.

Then, about the pulp selected, in the ninth step of washing and concentration step 109, using a decker to wash the chemical liquid from the pulp, and squeezed water to concentrate.

Decker is a machine for squeezing and concentrating water by washing the pulp as shown in (b) of FIG. 3, using the decker to prepare pulp that is concentrated to a concentration suitable for washing and bleaching the pulp.

The washing is carried out in at least three stages to remove as much of the fines and flow cells as possible.

The pulp washed and concentrated by the decker is subjected to the bleaching step 110, which is a tenth step. For bleaching, it is desirable to adopt the oxygen bleaching method in order to find solutions for various problems such as environmental problems, economical efficiency and energy saving.

According to the present invention, by removing 50% or more of lignin in the unbleached pulp before the chlorination step, the amount of chemicals used in the next bleaching step can be reduced, thereby reducing environmental pollution and reducing energy costs.

That is, the energy required for oxygen production is equivalent to one eighth of the energy required to produce the same amount of chlorine chemically, and oxygen is cheaper than other reagents. Oxygen bleaching reduces the viscosity because it is accompanied by a cellulose decomposition reaction, but a method for preventing this is to remove metal ions contained in the pulp to facilitate the generation of radicals by washing with an acidic solvent before the oxygen stage. In parallel, the addition of magnesium, a carbohydrate protective substance, prevents the decomposition reaction of cellulose and forms magnesium hydroxide precipitates to absorb metal ions (iron, manganese, copper) in the pulp, thus preventing a decrease in viscosity.

At this time, in order to avoid the reaction with carbohydrates and to improve the reaction with lignin, the unbleached pulp is treated with nitrogen dioxide in oxygen to increase the selectivity effect and increase the lignin removal rate up to 80%.

The bleached pulp is subjected to an acid treatment and washing step 111 as the eleventh step. This acid treatment and washing step is carried out for the purpose of removing the metal ions present in and on the surface of the pulp that may have been introduced in the bleaching step 110.

In other words, during the bleaching process, to remove metal ions on the surface and inside of the dissolving (fiber) pulp, the pH is adjusted to 3 to 5, acid treated at room temperature for 30 to 60 minutes, and the pH becomes neutral. Wash with clean water until clean.

At this time, the acid treatment time can be adjusted according to the content of metal ions and the degree of difficulty of removal.

Finally, as a twelfth step, the pulp is completed while passing through the roll manufacturing step 112 of manufacturing the pulp into a roll.

According to the present invention, it is preferable that the pulp of the roll type is made of a web having a thickness of 0.5 mm to 1.2 mm and wound in a roll state.

Hereinafter, the present invention will be described in more detail with reference to the following examples.

Example 1.

Remove the seeds and leaves produced in Korea and cut the horses grown for more than 3m, wash the foreign substances attached to the stems, put them in the peeler, separate the bundles, dry them, and cut them horizontally to 0.3m ~ 0.5m, 0.5mm ~ 1mm length. Cut and make hair chips in the form of thick hair.

Take the amount of 500g of dry hair among these hair chips, put it in digester, fill it with water, add lignin-decomposing microorganisms (white fungi), hold it for 2 hours to 3 hours at 50 ~ 60 ℃, and adjust the liquid ratio to 1.3: 1. Put a stainless steel weight on the forehead until the hair chips are fully submerged.

The lid of the digester was covered and the screws were tightened, followed by hydrolysis at 120 ° C. for 30 minutes.

After washing the hydrolyzed contents, it is added to the digester again and the weight ratio of active alkali 8% (converted to Na ₂ O) and anthraquinone 0.05% is added to the hair chip weight and the liquid ratio is adjusted to 1: 1, and then 100 Cooking was carried out at 25 ° C. for 25 minutes.

The pulp from which cooking was completed was washed with DED three-stage bleaching.

Experimental results of prehydrolysis and pulping of hemp 1 Pulp yield before bleaching (%)   42.0 Kappa value   11.5 Pulp yield after bleaching (%)   40.1 Whiteness (%)   87.8 Alpha cellulose (%)   95.3 Viscosity (cps)    5.7 Degree of polymerization    910

Example 2.

Treatment and most of the conditions were the same as in Example 1, and the pre-hydrolysis and bleaching conditions were applied as follows.

During hydrolysis, the liquid ratio was adjusted to 1: 1, and hydrolysis was performed at 120 ° C. for 30 minutes.

DEDD 4-stage bleaching was performed on the cooked and washed pulp, and the obtained characteristics are shown in Table 2.

Experimental Results of Whole Hydrolysis and Pulping of Hippocampus 2 Pulp yield before bleaching (%)   40.2 Kappa value   10.7 Pulp yield after bleaching (%)   38.6 Whiteness (%)   89.2 Alpha cellulose (%)   96.2 Viscosity (cps)    5.2 Degree of polymerization    850

As described above, the present invention is to cut the non-wood plant hemp to prepare a hair chip (Hair Chip) treated with lignin-decomposing microorganisms, so that the pre-hydrolysis and cooking is easily progressed. Accordingly, it is possible to produce an eco-friendly melting ecopulp that reduces chemical consumption and reduces environmental pollution. Furthermore, the soda-AQ method using anthraquinone as a catalyst in the cooking process can be applied to the pulping of hemp. Therefore, it is an improvement in pulping pulping technology that has the advantages of effective lignin, quality improvement and yield, energy consumption reduction, and oxygen bleaching to reduce the environmental pollution. Provide technology.

Claims (7)

As a method for producing hemp-derived pulp,
Pretreatment step 101 of removing the seeds and leaves from the hemp and then cutting horizontally, screening and washing;
Peeling step 102 to remove the skin of the hemp obtained in the pretreatment step and put into the peeler to obtain the inner skin;
A cutting step 103 for producing a hair chip (Hair Chip) by horizontally cutting the inner core of the hemp obtained in the peeling step to a length of 0.3m ~ 0.5m and then vertically cut to a thickness of 1.5mm ~ 1mm;
Microbial treatment step 104 of introducing a white fungus as a microorganism that decomposes lignin to the hair chips obtained in the cutting step;
A pre-hydrolysis step 105 of dissolving hemicellulose by adding water or steam and sulfur dioxide or sulfuric acid to the lignin-decomposed microbial treated hair chips in the microbial treatment step;
The hair chip treated in the pre-hydrolysis step is administered to the cooking part (digestor) and the ratio of the chemical weight composed of water, alkali and anthraquinone to the hemp weight, that is, the liquid ratio is 1: 2.5 to 3.0 (MA: chemical solution). Cooking step 106 of pulping by heating to a high temperature;
A dust removal step 107 of removing foreign matter from the pulping in the cooking step by using a centrifugal damper;
A selection step 108 of removing foreign matters using a pressure screen to remove foreign matters in the dust removing step, and putting the portion having less cooking content into the cooking part (digestor);
Washing and concentration step 109 to wash the medicinal solution using a decker that was selected in the selection step, squeezing water and concentrated to obtain pulp;
Bleaching step (110) for bleaching the pulp obtained in the washing and concentration step;
An acid treatment and washing step (111) for removing metal ions existing on the surface and inside of the pulp obtained in the bleaching step; And
Roll manufacturing step 112 for producing a pulp obtained in the acid treatment and washing step in a roll
A method for producing hemp-derived pulp, characterized in that it comprises a.
The method according to claim 1, wherein the pre-hydrolysis step 105, hemp-derived dissolving pulp, characterized in that the liquid ratio (weight ratio) of the liquid containing water and hair chips is 1.0 to 1.3 Manufacturing method.
The method according to claim 1, wherein the cooking step 106, the weight of the alkali added to the water is 5% to 8% of the weight of the dry hair (pure mass excluding moisture contained in the hair chip) hair chip and anthraquinone (AQ) The weight is 0.05 to 0.1%, the cooking temperature is 110 to 130 ° C, and the cooking time is performed within a range of 50 minutes to 70 minutes.
The method of claim 1, wherein the bleaching step 110, by applying the oxygen bleaching method to prevent the viscosity reduction of magnesium to the weight of the total weight pulp 0.05% to 0.1% of the hemp-derived dissolution pulp, characterized in that Manufacturing method.
The method of claim 4, wherein the unbleached pulp is treated with nitrogen dioxide in oxygen to increase the lignin removal rate to 80% during the oxygen bleaching method.
The method of claim 1, wherein the acid treatment and washing step 111, the pH is adjusted to within the range of 3.5 to 5.5 and 15 minutes to 50 minutes acid treatment at room temperature, and then washed with clean water until the pH is neutral. Method for producing hemp-derived pulp to be used.
The method of claim 1, wherein the roll produced in the roll manufacturing step 112 is made of a paper-based roll of 0.5mm to 1.0mm thickness wound method of producing hemp-derived pulp.

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