KR101655341B1 - Continuous Manufacturing Method of Pulp From Rhodophyta - Google Patents

Abstract

The present invention relates to a continuous process for producing pulp using red algae, comprising: an extraction step of supplying red algae, an aqueous acid solution and steam to a continuous extraction device; A separation step of separating the gel and residue of the red algae through the extraction step; A primary bleaching step of supplying the residue and steam obtained through the separation step to the primary bleaching apparatus to perform bleaching treatment; A second bleaching step of supplying the residue and steam through the primary bleaching step to the secondary bleaching device to bleach the same; And a step of supplying dehydration and drying the residue through the secondary bleaching step to the drying apparatus.
The production method of the present invention is suitable for mass production of pulp using red algae because calcium carbonate can be effectively removed while using less acid solution and pulp can be produced through a continuous process.

Description

TECHNICAL FIELD [0001] The present invention relates to a continuous production method of Pulp from Rhodophyta

The present invention relates to a continuous process for producing pulp using red algae, and more particularly, to a continuous process for producing pulp using red algae residue as a waste in an agar manufacturing process.

Generally, fibers obtained by mechanically or chemically treating a plant material are referred to as pulp. Actually, in addition to wood, cotton, hemp, flax, jute, jama, manila hemp, mulberry mulberry, mulberry, straw, esparto, bamboo, and bergas are used as pulp raw materials. However, as a raw material for industrial purposes, it is required to be rich in quantity, easy to collect, transport and store, be cheap, and have excellent quality.

Although pulp raw materials are mainly used as raw materials for wood, it is a challenge for the industry to produce paper raw pulp while protecting the forests and the environment as the depletion of wood resources becomes worse worldwide. As a solution to this problem, a technique of producing pulp for paper from non-woody plant fiber mainly based on a biennial plant has been attracting attention.

Non-woody plants available as paper mills include mulberry bast, flax, hemp, cotton, manila hemp, straw straw, and bagasse. In general, non-woody plants contain a large amount of pectin, hemicellulose, and inorganic matter, less lignin, and when pulping, chemical, semi-chemical, and mechanochemical methods are used, Bleached or bleached pulp can be obtained.

Non-wood pulp has different properties depending on the fiber type, chemical composition, and type and amount of non-fibrous cells. Therefore, paper made by non-wood pulp alone or by proper blending with wood pulp can easily control the strength, durability, electrical characteristics, gloss, dimensional stability and printing performance, and can be used for various purposes , So the range of use is also wide.

However, the soda method, the sulfite method, and the kraft method are mainly used for producing chemical pulp for paper from non-woody plant fiber. In the pulp manufacturing method, the sulfite method and the craft method use a large amount of Na ₂ SO ₃ Sulfur compounds such as Na ₂ S must be used. Odor and wastewater contamination by these compounds has reached a serious level. As a desulfurization pulping method, a soda-digestion method has been proposed, but soda alone has a problem in that the pulp yield is lowered and the strength of the paper is lowered. To compensate for this, anthraquinone has been recently used as a preparation with soda, but anthraquinone has difficulties in preparation of a steaming solution and is difficult to biodegrade. In addition, anthraquinone is very expensive and may cause an increase in the production cost of non-wood pulp.

For example, a process for producing pulp using corn has been proposed. However, when pulp is manufactured using cornstalks as pulp raw materials for paper making, chemicals having high toxicity are used, so the environment is contaminated and corn is secured There are disadvantages in terms of local and cost aspects.

In order to solve such environmental pollution problems, the present inventors have disclosed inventions of pulp and paper using red algae in Korean Patent Publication Nos. 10-0754890 and 10-0811193.

However, the above pulp manufacturing method is a method of producing pulp by dipping red algae in an acidic solution to remove calcium carbonate and bleaching the calcium carbonate, which is effective in the synthesis at a laboratory scale since it is inevitable to treat with a large amount of acid solution. There are many problems such as treatment of polluted water, installation of explosion-proof equipment, and optimization of process conditions.

Prior to this, the Korean Provisional Patent Publication No. 10-0512793 has developed a method for preparing pulp by immersing red algae in an extraction solvent to dissolve the agar gel and converting it into fiber, but in this method, calcium carbonate is not sufficiently removed The calcium carbonate particles in solid state are trapped between the pulp fibers to deteriorate the quality of the pulp. Therefore, it has been found that the use of an acidic solution is indispensable.

Accordingly, in Korean Patent Publication No. 10-1547101, a calcium carbonate component of red algae can be removed even by using a small amount of acid aqueous solution using a pressure vessel, and a process capable of mass production instead of the existing laboratory level has been developed .

However, since the production method using the above-mentioned pressure vessel is based on a batch process, the production amount thereof is insignificant compared with the general pulp production process. Therefore, a method for producing pulp using red algae by a continuous process should be developed so that it can be used as a manufacturing method applicable to mass production for commercial purposes.

The present inventors have developed a continuous extraction apparatus capable of extracting a solute by separately injecting a solute-containing substance and a solvent in Korean Patent Publication No. 10-0990790. Such a continuous extraction apparatus can not be directly applied to the pulp production method using the red algae of the present invention, but it is expected that the continuous extraction apparatus can be applied to a continuous production method if pH adjustment and temperature control are possible.

Korean Patent Publication No. 10-0754890 Korean Patent Publication No. 10-0811193 Korean Patent Publication No. 10-0512793 Korean Patent Publication No. 10-1547101 Korean Patent Publication No. 10-0990790

Disclosure of Invention Technical Problem [8] Accordingly, the present invention has been made keeping in mind the above problems occurring in the prior art, and it is an object of the present invention to provide a method of continuously producing pulp so that pulp using red algae can be mass produced.

In addition, the red algae extraction process can be efficiently performed by the continuous process, and the red algae before the agar extraction, as well as the red algae residues of the agar production process, are used to produce the pulp, And a method for producing the same.

To attain the above object, the present invention provides a continuous method for producing pulp using red algae, comprising: an extraction step of supplying red algae, an aqueous acid solution and steam to a continuous extraction apparatus; A separation step of separating the gel and residue of the red algae through the extraction step; A primary bleaching step of supplying the residue and steam obtained through the separation step to the primary bleaching apparatus to perform bleaching treatment; A second bleaching step of supplying the residue and steam through the primary bleaching step to the secondary bleaching device to bleach the same; And a step of supplying dehydration and drying the residue through the secondary bleaching step to the drying apparatus.

At this time, the red algae may be a residue of an agar manufacturing process, and may be a residue of agar, such as Agarwood, Acromipitone, Graphene, Rhizoma, Cocktail, Gambar, Pink, And a mixture of one or more members selected from the group consisting of anchovy, hippopotamus, chinensis, sprout, fenugreek, and noodles.

The continuous extraction device, the bleaching device, and the drying device are connected by a conveyor or a pipe. At least one of a temperature sensor, a pressure sensor, and a pH sensor is installed inside the continuous extraction device and the bleaching device .

Due to the features of the present invention, the continuous production method of the pulp of the present invention can achieve the effect of mass production of pulp using red algae.

In addition, the red algae extraction process can be efficiently performed by the continuous process, and the red algae before the agar extraction, as well as the red algae used in the agar manufacturing process, are used to manufacture the pulp, Can be manufactured.

1 is a cross-sectional view illustrating a continuous extraction apparatus for performing an extraction step according to the present invention.
2 is a cross-sectional view illustrating a bleaching apparatus for performing a bleaching step according to the present invention.
3 is an electron micrograph showing the state of the paper (a) obtained from the pulp produced by the continuous production method of the present invention and the paper (b) obtained from the conventional wood pulp.

Hereinafter, the present invention will be described in detail.

The method for producing pulp using red algae according to the present invention comprises: an extraction step of supplying red algae, an aqueous acid solution and steam to a continuous extraction device; A separation step of separating the gel and residue of the red algae through the extraction step; A primary bleaching step of supplying the residue and steam obtained through the separation step to the primary bleaching apparatus to perform bleaching treatment; A second bleaching step of supplying the residue and steam through the primary bleaching step to the secondary bleaching device to bleach the same; Supplying the residue through the secondary bleaching step to a drying apparatus, and dehydrating and drying the residue.

In the present invention, the residues means remnants remaining in addition to the main use, and the red algae residues means the residual residues generated in the agar manufacturing process.

The red algae to be used in the present invention may be selected from the group consisting of a red ginseng tree, an acromipitone tree, a grapevine tree, a rhododendron tree, a crocodile tree, a gambling tree, a pink goddock, a glume fan tree, a nematocarp, a curly tree, And a mixture of one or more members selected from the group consisting of a carpenter's neck, a fir tree neck, a fuchsia neck, and a noodle neck tree, and preferably a mixture of a cinnabar tree neck, a stagger neck neck, Neck, gambling, noodles, or the like, and more preferably, it is possible to use a mugwort that belongs to the mugwort tree. In addition, the red algae themselves can be used as a raw material before the agar extraction, but red algae which are waste (residue) in the agar manufacturing process can also be used.

Agar is made by adding red algae such as mugwort and cicada into water, boiling and extracting the agar, coagulating the liquid to make a hammock, and repeatedly melting and dehydrating it and drying it. At this time, agar is extracted and the remaining residue is a mass of endo-fiber and plant cells.

According to the present invention, pulp can be produced by recycling resources and using environmentally friendly manufacturing methods by using the wastes generated in the agar manufacturing process as a raw material in the production of pulp.

In the conventional process for producing pulp using red algae, impurities such as calcium carbonate are removed through a red algae extraction process and softening of the algae skin is carried out. That is, it is immersed in an acidic aqueous solution having a pH of 2 to 4 for about 1 hour, then washed with water and dehydrated.

Generally, agar as a food is considered to be harder than when it is cooled, and the agar manufacturing plant extracts it by increasing the pH value with KOH and NaOH while performing hot water extraction. However, in the red algae pulp manufacturing process, since the agar component should be removed as much as possible, the pH should be lowered to make the agar content as thin as possible, so that it does not harden at room temperature, thereby increasing the efficiency in bleaching and shortening the time required for bleaching.

Therefore, even in the case of red algae waste already subjected to the extraction process in the agar manufacturing process, the agar component is not completely removed, so that the red algae pulp production process must be repeated again.

In the process of manufacturing red algae pulp, when transferring from one facility to another facility, the raw material or intermediate output is transferred to a pipe or a hose by using a pump in a state where it is loosened in water. At this time, It can become tangled with each other or stick to pipes, hoses, pumps, etc., which can cause a lot of problems in the process.

In addition, when agar is used as a raw material for a fermentation process for the production of biofuels rather than food, liquefaction must be carried out. In other words, acid treatment is an important process not only for pulp production of red algae waste through acid treatment but also for biofuel production.

In addition, since the agar ingredient is coated on the raw material without the acid treatment for lowering the pH in the extraction process, it is necessary to use a large amount of bleaching agent and the bleaching reaction time becomes long, and the efficiency of the bleaching process, The extraction process through acid treatment is a very important factor in the pulp manufacturing method of the present invention.

For lowering the pH for such an extraction process, acetic acid, sulfuric acid, and the like can be used.

However, when the raw material is immersed in the acidic solution and the extraction step is performed as in the prior art, the pH must be lowered to 2 to 4, so that a large amount of acid should be used. Nevertheless, There is a problem that the processing and the process become complicated.

Therefore, Korean Patent Registration No. 10-1547101 adopts a method of "boiling" a raw material in the state that an acid is added to the extraction water itself to make acidic water.

This process is implemented as a hydrothermal treatment using a pressure vessel. When the hydrothermal treatment is performed through the hydrothermal treatment as described above, the extraction efficiency is high, but there is a limit in mass production. That is, raw materials must be collected and separated according to each batch, and bleaching process must be performed again in the bleaching device, so that loss and contamination of raw materials can not be avoided, and there is also a limit to increase the process speed.

In the present invention, an extraction process is performed using a continuous extraction apparatus for a continuous production process.

As shown in FIG. 1, the continuous extraction apparatus of the present invention includes a tank 100 configured to pass red algae, an aqueous acid solution, and steam through the inside thereof; A transfer screw 200 mounted in the tank 100 for transferring the red algae, an aqueous acid solution, and steam from one end to the other end; A raw material inlet 110 formed at one end of the body of the tank 100 for supplying red algae; A plurality of auxiliary input ports 120 formed in the body of the tank 100 for supplying an aqueous acid solution and steam; And an outlet 130 formed at the other end of the tank 100 for discharging red algae and aqueous acid solution.

The feed screw 200 is driven by a motor and when red algae are supplied to the raw material input port 110 formed at one end of the tank 100, the feed screw 200 is transported along the body of the tank 100 by the rotation of the feed screw 200 And is discharged through the discharge port 130.

In addition, the extraction device may be arranged so as to prevent the acid aqueous solution from being discharged when the red alga after completion of the extraction process is discharged out of the tank 100 through the discharge port 130. In addition, the dewatering device 140 may be provided on the side of the discharge port 130 so that the acid aqueous solution may be collected separately even if the extraction device is disposed horizontally.

The dewatering device 140 may have a structure for squeezing water by squeezing red algae, or may have a structure for squeezing water using a centrifugal force like a dewatering structure of a washing machine.

In order to recycle the acid aqueous solution collected by the dewatering device 140, an acid aqueous solution collected from the dewatering means 140 may be supplied to the outside of the tank 100 for recycling to the auxiliary inlet 120 of the tank 100 To the tank (200). Further, a separate pump for transferring the acid aqueous solution collected from the dewatering unit 140 to the storage tank 300 may be additionally provided.

The residue of the red algae collected in the storage tank 300 is transferred to the bleaching device 400 through an automatic transfer device such as a conveyor belt.

In the present invention, the red algae are injected into the raw material input port 110 and are conveyed along the body of the tank 100 by the rotation of the conveyance screw 200 to be subjected to the extraction process and the residue is separated and collected through the discharge port 130 It takes about 1 to 3 hours. The steam and / or the aqueous acid solution may be supplied through the plurality of auxiliary inlet ports 120 formed in the body of the tank 100, since the processability can be maintained when temperature, pH, and pressure are maintained during the extraction process. can do.

For this, a sensor 150 of at least one of a plurality of temperature sensors, a pressure sensor, and a pH sensor is installed in the body of the tank 100, and preferably a temperature sensor, a pressure sensor, and a pH sensor are all installed . Each sensor and control unit are connected so that the pH value, pressure and temperature measured from each sensor are displayed through a control unit (not shown). Accordingly, it is possible to continuously monitor changes in pH, pressure, and temperature of each region of the body of the tank 100, and when there is a change in pH, pressure, or temperature, / Or an aqueous acid solution may be added. This process can be performed by operating a valve that opens and closes each auxiliary inlet 120 through the control unit.

For example, when the temperature in the tank 100 drops, the valve is controlled by the electronic valve to further inject steam. At this time, the temperature and pressure should be checked at the same time to maintain the proper temperature and pressure. In particular, the temperature and pressure are always proportionally variable and must be measured and controlled at the same time. A pressure / temperature automatic retention device may be added to simultaneously control and maintain such temperature and pressure.

When adding an aqueous acid solution for pH adjustment, the temperature and pressure varying by the acid aqueous solution portion may be sensed through the sensor 150 and the steam may be additionally injected through the automatic pressure / temperature maintenance device.

In the case where the sensor 150 and the auxiliary inlet 120 for adding steam and / or an aqueous acid solution are not provided, the pH, The pressure and the temperature can not be maintained constant, impurities of the residue passing through the continuous extraction apparatus are left in a large amount, and the reliability of the process can not be ensured. Therefore, the sensor 150 and the auxiliary inlet 120 constitute an essential technical element for carrying out the continuous process of the present invention.

In the present invention, the residue of red algae which have passed through the tank 100 and subjected to the extraction step is transferred to the bleaching device 400 or once collected in the storage tank 310 and then transferred to the bleaching device 400 through the conveying means such as a conveyor belt Lt; / RTI >

The red algae residue subjected to the primary bleaching process in the bleaching device 400 is transferred to the additional bleaching device 400 to undergo a secondary bleaching process.

In the present invention, bleaching treatment may be carried out by bleaching the bleaching agent twice or more by using any one or more of bleaching agents such as non-chlorine bleaching agent and hydrogen peroxide to obtain a desired degree of whiteness.

By the bleaching treatment of the present invention, red algae can obtain a whiteness value of 80 or more and can be used as a raw material capable of producing high quality paper by a papermaking process.

The bleaching treatment is preferably a bleaching agent selected from the group consisting of 5 to 15% by weight of chlorine dioxide and 30 to 50% by weight of hydrogen peroxide. One bleaching agent may be used in each bleaching treatment, A bleaching agent may be mixed, and an acid or a base may be additionally mixed for pH control. The acid used for pH control may be any one of acetic acid, hydrochloric acid, nitric acid, sulfuric acid, phosphoric acid and organic sulfonic acid or a mixture thereof. The base may be any one of calcium hydroxide, sodium hydroxide and ammonia or a mixture thereof .

Since the red algae are decomposed by heat and acid during the extraction process, they become slightly acidic in the final stage. Since the pH is raised by the bleaching process, the wastewater and the pulp itself It is possible to maintain the neutrality so that the contaminated water hardly occurs and the wastewater can be efficiently treated.

As the pulp production process according to the production method of the present invention proceeds, the total weight of red algae decreases.

First, after the extraction process, the agar components are removed and the endo-fibers and somatic cells remain. The somatic cells remain in the red algae even in the extraction process. These somatic cells are removed in the bleaching step while being blended in the bleaching agent and separated from the fiber components. Therefore, not only bleaching but also removal of residual somatic cells is carried out through the bleaching process, so that the total weight of the red algae is reduced as the bleaching process proceeds.

The bleaching device 400 for performing the bleaching step of the present invention is as shown in Fig.

In other words, in the present invention, the bleaching device 400 feeds the red algae residue transferred by the conveying device such as a conveyor belt together with the bleaching agent for bleaching, and is transported by the transporting screw 410 to move in the downward direction. At this time, a plurality of partitions 420 are provided inside the bleaching device 400 at positions shifted from the plurality of vanes constituting the conveying screw 410, so that the red algae residue does not fall down, To be transported downward from above. The steam inlet 430 and the steam outlet 440 for supplying steam to the space between the partition walls of the bleacher 400 composed of double partition walls to maintain a constant temperature inside the bleacher 400 during transportation Respectively.

The time required for the red algae residue to pass through the bleaching device 400 is 0.5 to 2 hours, and the bleaching reaction occurs in the course of mixing with the bleaching device 400 and passing through the bleaching device 400.

In FIG. 2, the pulp does not simply fall down from the top of the bleacher 400, but pushes down the pulp by using a screw press (not shown) installed below the bleacher 400. The operation of the screw press causes the pulp passing through each device to be continuously pushed out, thereby enabling a continuous manufacturing process.

That is, in the present invention, the continuous manufacturing process is a continuous process (one-tube process) in which a single pipe is connected from the input of the raw material to the completion of the pulp product. Therefore, unlike the conventional batch type process, the process efficiency can be dramatically improved.

Two bleaching devices 400 are connected to the bleaching device 400 for the bleaching process twice, and the two bleaching devices 400 are connected by a conveying device such as a conveyor belt.

The red algae residue, which has been bleached through the bleaching device 400, is supplied to a dewatering device and a drying device, and is made into pulp by subjecting the dewatering and drying process to fibrosis. In this process, the bleaching agent remaining on the red algae residue can be diluted and removed through the washing device. Among these processes, small sized fibers or somatic cells are lost, and for this reason, the total weight of the red algae before and after the process is reduced.

It was found that when the conventional process was carried out, the dry weight of the red algae collected after the extraction process was reduced by 80 to 85% after bleaching and washing. Therefore, when the reduction rate is 85% or more, it can be judged that sufficient agar component removal is not performed in the extraction process, and when it is 80% or less, it can be judged that the raw material disappearance occurs in the continuous process. It can be used as a parameter.

For the pulping process, a red algae residue that has undergone a drying step may be injected into a mesh of 40 to 200 mesh using a high-pressure nozzle and classified.

The pulp produced by the manufacturing method of the present invention can be made of paper by processing.

Paper is generally produced by a papermaking process involving deliberation, sizing, filling, sorting and selection, papermaking, and processing, in which the cellulosic fibers are in the form of a sheet having a network structure. Thus, the pulp produced by the manufacturing method of the present invention can also be made of paper by a conventional paper making process.

In the present invention, paper can be produced from the pulp by a machine paper-making method using a circular or intaglio paper machine. At this time, the paper can also be produced by using the pulp mixed with the pulp of the present invention and wood pulp. In addition, it may further include a moisture conditioning step of controlling the moisture contained in the paper after it is made into a mechanical grass.

Hereinafter, the present invention will be described in more detail by way of examples. It is to be understood by those skilled in the art that these examples are for illustrative purposes only and that the scope of the present invention is not construed as being limited by these examples.

[Example]

A byproduct of agar manufacturing process, a byproduct of agar manufacturing process, was supplied to a continuous extraction device in an amount of 100 kg per hour (dry weight) per hour to carry out an extraction process. The time required for the mugwort waste to pass through the continuous extraction apparatus was set at 2 hours. In addition, an aqueous acidic solution containing 1% by weight of sulfuric acid (purity: 95%) and steam were supplied to the continuous extraction apparatus to maintain the pH of 3 to 4 and the internal temperature at 90 to 110 ° C.

The residues of Waste wood waste after the extraction process were collected in a storage tank, transferred to a conveyor belt, and put into a first bleaching tank. The bleaching agent prepared by mixing 10% by weight of chlorine dioxide (8% concentration) and 2% by weight of acetic acid (98% purity) was set to take 1 hour for the residue to pass through the first indicator swan. : ≪ / RTI > 1 by weight.

The residue of the bleached mugwort waste was collected in a storage tank and then conveyed to a second bleaching tank through a conveyor belt.

The residues of the cedar wood waste put into the second bleaching tank were mixed with a bleaching agent prepared by mixing 20 wt% of hydrogen peroxide (35% concentration) and 5 wt% of caustic soda (20% concentration) at a weight ratio of 1: 0.5 . The residue was set to take 1 hour to pass through the first indicator swan.

After the bleaching, the residue of Woojukgasari waste was passed through a dehydrator and a drying device, and then dehydrated and dried to obtain pulp.

The pulp thus produced was made into paper using an intaglio paper machine. At this time, the width was set to 1630 mm and the papermaking speed was 50 to 100 m / min.

60% by weight of the pulp produced by the above-mentioned production process and 40% by weight of wood pulp were mixed and ground to a basis weight of 45 g / m 2. The prepared paper was first dried in a dryer (Yankee dryer) at 80 ° C and then secondarily dried in a secondary dryer at 120 ° C.

The wood pulp was mixed with softwood and hardwood at a weight ratio of 1: 1 using DDR (Double Disk Refiner).

[Comparative Example]

60 kg (dry weight) of Ugukgasari waste, which is a by-product of the agar manufacturing process, was charged into a pressure vessel and 2,400 L of an aqueous acid solution containing 1 wt% sulfuric acid (purity 95%) was introduced. Respectively. At this time, the internal pressure was stabilized to about 1.5 atm and the internal temperature to about 110 deg. After the temperature and pressure were stabilized, hydrothermal treatment was performed for 2 hours.

The bleaching was carried out with 50 kg of a bleaching agent prepared by transferring the waxy waste (dried weight 40 kg) that had undergone the hydrothermal treatment to the first bleaching bath and mixing 10 wt% of chlorine dioxide (8% concentration) and 2 wt% of acetic acid (purity 98% Respectively. Next, bleaching was carried out with 11.5 kg of bleaching agent prepared by mixing the 20 wt% hydrogen peroxide (35% concentration) and 5 wt% caustic soda (20% concentration) Respectively.

Finally, the wastepaper waste (dry weight 12 kg) was transferred to the third bleaching tank and bleached with 3.5 kg of bleach prepared by mixing 10 wt% hydrogen peroxide (35% concentration) and 3 wt% caustic soda (20% Respectively.

After the final bleaching, the water-repellent fibers were blended on a 200-mesh filter using a high-pressure nozzle using a blender to obtain pulp.

Using the pulp thus produced, paper was prepared in the same manner as in Example 1.

Test results on density, tensile strength, heat shrinkage, elongation, smoothness, opacity, whiteness and ashes of paper produced using the pulp produced by the continuous production method of the present invention and the conventional production method using the pressure vessel are shown in The results are shown in Table 1 below.

density
(g / cm3) Tensile strength (N) Heat gauge
(km) Elongation
(%) Smoothness (sec) Opacity (%) Whiteness
(%) Ash
(%) Top Wire Ash
(%) Example 0.73 51.54 6.32 4.50 30.82 16.20 87.46 86.98 - Comparative Example 0.71 52.23 6.72 4.19 30.75 16.50 86.37 87.59 -

The results of Table 1 show no significant difference in the characteristics of the paper produced by the continuous production process of the present invention and the paper produced by using the conventional pressure vessel and the opacity and whiteness were somewhat It can be said that the pulp quality is not lowered at all during the mass production process.

Accordingly, it has been confirmed that the continuous process for producing pulp of the present invention can provide an improved process capable of mass-producing high quality paper through a continuous process instead of a batch process using a conventional pressure vessel.

Further, as shown in Fig. 3, when the texture state of the paper (a) obtained from the pulp produced by the continuous production method of the present invention and the paper (b) obtained from the conventional wood pulp is observed through an electron microscope, Since the paper obtained through the pulp of the present invention contains red algae as a raw material thereof, it has been found that the paper obtained by maintaining thin and uniform fibers is very smooth and opaque and thus can be applied to high quality paper products. On the other hand, the conventional wood pulp was found to be thick and uneven in fiber, so that the obtained paper had a roughness and opacity lower than that of the paper of the present invention, and therefore it should contain additional components such as a filler.

While the present invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, It is obvious to the person.

100 tank
110 Raw material input port 120 Auxiliary input port
130 Outlet 140 Dewatering device
150 sensor
200 Feed Screw
300, 310, 320 Storage tank
400 bleaching device
410 Feed screw 420 Barrier
430 Steam inlet 440 Steam outlet

Claims (5)

A continuous method for producing pulp using red algae by a continuous process (one-step process) which is carried out by being connected with a single pipe from input of raw material to completion of pulp product,
An extraction step of supplying red algae, an aqueous acid solution and steam to the continuous extraction device;
A separation step of separating the gel and residue of the red algae through the extraction step;
A primary bleaching step of supplying the residue and steam obtained through the separation step to the primary bleaching apparatus to perform bleaching treatment;
A second bleaching step of supplying the residue and steam through the primary bleaching step to the secondary bleaching device to bleach the same;
Supplying the residue through the secondary bleaching step to a drying apparatus, dewatering and drying the residue;
/ RTI >
Wherein at least one sensor of at least one of a temperature sensor, a pressure sensor and a pH sensor is installed in the continuous extraction device and the bleaching device.
The method according to claim 1,
Wherein the red algae are wastes (extracted residue) of the agar manufacturing process.
The method according to claim 1,
The red algae may be selected from the group consisting of a cinnabar tree, an acromyceton neck, a grapevine tree, a rhododendron tree, a crocodile neck, a gambling neck, a pink rhododendron, a slippery neck, a nematostomus, a curly aphid, a silk neck, And a mixture of one or more selected from the group consisting of cottonwood, cottonwood, cottonwood, cottonwood, ela wood, and noodle tree.
The method according to claim 1,
Wherein the continuous extraction device, the bleaching device, and the drying device are connected by a conveyor or a pipe.
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