KR101847039B1 - Manufacturing Method of Pulp From Agar - Google Patents

Abstract

The present invention relates to a method for producing pulp using agar, comprising the following steps: supplying agar residues to an extractor; extracting the agar by applying thermal energy and mechanical energy to the agar residues; and bleaching the extracted agar residue. According to the production method of present invention, since the pulp can be continuously produced without using acidic solutions for raw agar, the process efficiency is high, and the waste water generation amount can be remarkably reduced.

Description

Technical Field [0001] The present invention relates to a method of manufacturing a pulp from a pulp,

More particularly, the present invention relates to a method for producing pulp by extracting and bleaching processes without acid treatment on a green algae.

BACKGROUND OF THE INVENTION [0002] Conventional pulp is a fiber obtained by mechanically or chemically treating a plant material such as wood. Recently, a technique for producing pulp from a non-woody plant has been developed due to depletion of wood resources.

The sulphate method, the sulfite method, and the kraft method are used as the method for producing the chemical pulp for paper from the non-woody plant material. The sulfite method and the craft method use a large amount of Na ₂ SO ₃ or Na ₂ S The same sulfur compounds must be used, and the 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.

On the other hand, a method of using red algae as a raw material replacing a plant raw material has been developed, and Korean Patent Publication No. 10-0754890 and Korean Patent Registration No. 10-0811193 disclose a method of producing pulp using red algae.

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.

In addition, Korean Patent Publication No. 10-0512793 has developed a method for producing pulp by immersing red algae in an extraction solvent to dissolve the agar gel to convert it into fiber, but in this method, calcium carbonate is not sufficiently removed, It was found that the use of an acidic solution was indispensable.

In order to solve these problems, Korean Patent Registration No. 10-1547101 has developed a process for producing pulp which can effectively remove calcium carbonate of red algae even if a small amount of acid is used by hydrothermal treatment of raw materials using a pressure vessel .

However, since the production method described above can reduce the amount of acid used, it is not suitable for the production process of pulp which requires mass production because it must be batch-wise manufactured for hydrothermal treatment, and the economical efficiency is low.

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

Disclosure of Invention Technical Problem [8] Accordingly, the present invention has been made in order to solve the problems of the prior art as described above, and it is an object of the present invention to improve the process cost and process efficiency by producing pulp continuously without using acid treatment, The present invention also provides a method for producing pulp.

It is also an object of the present invention to provide a method for producing pulp using a bean pulp that has a remarkably high ratio of pulp production to input amount of raw material and is excellent in economy.

According to another aspect of the present invention, there is provided a method for manufacturing a pulp using a bean curd, comprising: supplying a bean curd residue to an extractor; Extracting and applying thermal energy and mechanical energy to the residues of the leaves; And bleaching the residue of the extract of the mugwort residue.

The extraction process is performed using an extractor. The extractor is characterized in that mechanical energy is applied to the extractor by an agitator, and the extractor is treated for 1 to 3 hours at 100 to 120 ° C and normal pressure .

The bleaching treatment is performed once to three times using an aqueous hydrogen peroxide solution and a caustic soda aqueous solution.

In the pulp manufacturing method according to the present invention, the pulp production amount is 80% or more based on the weight of the residue.

The pulp production method of the present invention can produce the pulp without using the acid solution for the raw material of the bean sprouts and can be continuously produced without using the pressure vessel, so that the process efficiency is high and the amount of waste water generated is remarkably reduced.

In addition, the ratio of the pulp production amount to the input amount of the raw material is remarkably high, so that the economical efficiency is excellent.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a flow chart of a method for producing a pulp using a bean curd according to the present invention.
FIG. 2 is a cross-sectional view of an extractor for the production of pulp using a bean curd according to the present invention.
FIG. 3 is a test report verifying whether or not the lead, arsenic, antimony, cadmium, mercury, methanol, and formaldehyde of the pulp produced according to the present invention are detected.
Fig. 4 shows the general hazard evaluation results of the pulp produced according to the present invention.
FIG. 5 is a graph showing the results of evaluating the heavy metal adsorption performance of the pulp produced according to the present invention and measuring the lead adsorption performance (a) and the amount of residual lead (b) relative to the blank.
FIG. 6 is a graph showing the adsorption performance (a) of cadmium and the amount (b) of residual cadmium relative to the blank as a result of evaluating the heavy metal adsorption performance of the pulp produced according to the present invention.

Hereinafter, the present invention will be described in detail.

The method for producing pulp using the green beans of the present invention can be produced by pulverizing the green beans as shown in FIG. 1, preparing a residue, and then extracting, bleaching, dehydrating and fiberizing the same.

This will be described in more detail as follows.

First, the leaves are cut in order to prepare the leaves of the leaves. The reason for making the residue form is to maximize the extraction effect when put in the extractor. Such cutting can be carried out by using a screw conveyor, and the residue of the mugwort residue produced through the screw conveyor is immediately introduced into the extractor.

In the prior art, impregnation of calcium carbonate or the like and softening of the algae skin are carried out by immersing the mugwort in an acidic solution and heating or immersing it in the acidic solution for a long time. In this case, since an acidic solution having a pH of 2 to 4, particularly an aqueous solution of sulfuric acid, is used, there is a problem of neutralization treatment and wastewater treatment, and an additional facility such as an explosion-proof facility is required.

In the present invention, by applying mechanical energy and heat energy to the residue of the mugwort residue using an extractor, the outer skin of the mugwort is softened, thereby easily separating the outer skin and the inner fiber structure. Although there is no problem of wastewater treatment in the process that does not use the acid solution, if the process conditions are not optimized, there is a problem that the quality of the pulp to be produced is greatly deteriorated due to insufficient softening.

The present invention solves this problem by optimizing the structure and process conditions of the extractor. 2, an agitator including a shaft 110 and an impeller 120 driven by a motor is installed in the extractor, and a filter (not shown) for discharging impurities is disposed in the lower part of the extractor main body 100, (140) and an outlet (220). In addition, a plurality of baffles 130 are installed on a wall surface of the extractor, and a steam inlet 210 for supplying steam into the extractor is provided.

First, the extractor main body 100 is filled with residue residue through a raw material inlet 200, and mechanical energy is supplied by rotation of the impeller 120. As the impeller 120 rotates, the residues of the burnt leaves residing in the main body 100 are rotated. At this time, a vortex is formed by a plurality of baffles 130 installed on the inner wall surface of the main body 100, Mechanical energy is continuously added to the residues of the leaves. At the same time, steam is introduced from the steam inlet 210 to be mixed with the residues of the leaves, thereby increasing the temperature inside the main body 100 and continuously increasing the moisture content, thereby smoothly retaining the residues of the leaves.

This mechanical energy and thermal energy cause the separation of the outer shell of the residues and internal fibrous tissues, resulting in the formation of calcium carbonate and other impurities. The impurities are precipitated down in the kneading process. At this time, the impurities are discharged through the discharge port 220 together with the water through the filter net 140 installed in the lower part of the main body 100.

It is preferable to use a wire net having holes of 2 to 5 mm. If the pore size of the filter net is too small, the pores may be clogged by foreign substances and the removal efficiency of the foreign substances may be decreased. If the pores are too large, the loss of the raw material component is increased and the foreign matter may be effectively removed In order to optimize the size of the hole, it is preferable to use a filter net of the above-mentioned range.

Concretely, 1,000 to 2,000 parts by weight of water are added to 60 to 120 parts by weight of the residues of the myrtle leaves, and the mixture is agitated for 1 to 3 hours under the conditions of 100 to 120 DEG C and normal pressure to supply mechanical energy and heat energy. The amount of water to be blended is relatively small compared with the amount of the residue of leaves. Since the steam is continuously supplied into the extractor main body 100, the amount of water continuously increases even if the amount of initial water is small. The reason why the amount of the initial water is relatively small as 1,000 to 2,000 parts by weight is to promote the separation of the myrrh residue by the initial mechanical energy.

Through this process, the outer shell and the inner fiber structure are separated and most of the impurities are removed, and the residue is collected through the material outlet 230 of the extractor and transferred to the primary bleacher using the conveyor. In the production method of the present invention, the step of removing the outer shell and the impurities from the outer shell of the residue of the resin residue and the inner fiber structure are not separately required, so that the process is simplified.

In the prior art, if impurities such as calcium carbonate are not removed, the quality of the pulp to be produced can not be satisfied. Therefore, it is necessary to remove the impurities before the bleaching process. In the present invention, most impurities are removed while passing through the extractor. Bleaching is possible without. In addition, since the impeller and the lower filter mesh for stirring such as the extractor are installed in the bleacher, a small amount of residual impurities can be continuously removed even in the bleaching process.

The bleaching treatment is carried out one to three times using any one or more of bleaching agents such as non-chlorine bleaching agent and hydrogen peroxide. In particular, it is preferably carried out three times. In addition, since all the processes such as the extraction process and the bleaching process are carried out by conveying the raw material by the conveyor, the pulp can be produced by a continuous process.

An embodiment in which the bleaching process is performed three times will be described below.

First, in the first bleaching step, the primary whitening treatment is carried out. The temperature of the residue of the watercress transferred with water is raised to 70 to 80 캜 while mixing with a stirrer, and an aqueous hydrogen peroxide solution and a caustic soda aqueous solution are added thereto. When the hydrogen peroxide solution and the caustic soda aqueous solution are added, the pH can be adjusted to 11 to 12. In the pH condition, the temperature of the contents is raised to 90 ° C and the primary bleaching treatment is performed by stirring for 1 to 1.5 hours. Further, in the primary bleaching process, fibrosis proceeds by stirring. That is, the bleaching treatment is not merely for bleaching, but also promotes the fibrosis of the outer leaves and inner fibers of the leaves.

When the primary bleaching process is completed, primary dehydration is carried out using a screw conveyor and transferred to the second bleaching machine to perform secondary bleaching. In addition, the raw material which has been subjected to the second bleaching treatment is subjected to second dehydration using a screw conveyor and then to a third bleaching machine to perform the third bleaching process. The condition of the bleaching process is preferable in order to efficiently control the entire process condition performed under the same conditions as the primary bleaching process.

Further, when the bleaching process is performed once or twice, it may be carried out by changing the process conditions such as increasing the bleaching time or increasing the bleaching temperature.

The raw material that has been bleached is firstly stripped of moisture through a squeeze screen process, and the remaining debris is removed through a cleaner and a vibration screen. Further, the pulp from which the foreign matter has been removed is finished with pulp after final dewatering and fiberization process.

The pulp manufacturing method according to the present invention can produce the pulp in a continuous process rather than a batch process, and thus the production efficiency is greatly improved. In addition, in place of the pressure vessel used in the prior art, the raw material Ugukgasari is crushed by a screw feeder or the like, and is supplied into the extractor in the form of a residue. However, since the shell and the fiber are easily separated by supplying mechanical energy using an agitator provided in the extractor, There is an advantage in that it is not necessary to use the above.

In addition, since the bleaching process can bleach with hydrogen peroxide and caustic soda without using chlorine dioxide, acetic acid, or the like, unlike the prior art, the use of harmful chemicals can be reduced. That is, in the first to third bleaching processes, a mixture of aqueous hydrogen peroxide solution and caustic soda aqueous solution is used. More specifically, a 5% aqueous hydrogen peroxide solution and a 4% caustic soda aqueous solution are used. That is, sufficient bleaching can be performed while minimizing the amount of hydrogen peroxide and caustic soda contained in the bleaching agent.

This bleaching treatment is possible because the agitator is installed inside the bleaching machine and the mechanical energy is supplied in the bleaching process. By supplying such mechanical energy, it is possible to promote the separation of the outer shell and the fibrous tissue and to improve the efficiency of the bleaching process by preventing the outer shell and the fibrous tissue from being entangled with each other.

That is, unlike the prior art, the bleaching process is performed even when the concentration of the bleaching agent component is reduced or the harmful bleaching agent is excluded because the outer shell of the mugwort husk and the fiber structure are efficiently separated through the extractor. In particular, even if impurities such as calcium carbonate are contained in the raw material treated with the extractor, the quality of the pulp produced according to the production method of the present invention is not greatly affected, The production efficiency is greatly improved.

That is, according to the production method of the present invention, the weight of the pulp produced is 80% or more based on the amount of the residue of the leaves. Thus, it is confirmed that the loss of the raw material is small and the production efficiency is very high.

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.

120 kg of pearl bean sprouts were put into a screw conveyor and pulverized to prepare a pine bark extract residue.

The residue was transferred to an extractor having a capacity of 3.0 m < 3 > through a conveyor, and at the same time, 1,000 kg of water was supplied to the extractor. Then, the mixture was stirred with stirring while maintaining the temperature inside the extractor at 100 ± 5 ° C by supplying the steam while mixing the residue of the extract with the stirrer provided in the extractor. The residue of the mugwort residue, which was treated with an extractor and separated from the outer skin and the fiber structure, was supplied to the first bleacher by a conveyor.

When the first bleaching device having a capacity of 2.8 m 3 was filled with the residues of the mugwort residue, 1,000 kg of water was supplied and the stirrer installed in the bleaching device was operated to heat the inside of the bleaching device while maintaining the temperature at 70-80 ° C. A hydrogen peroxide aqueous solution having a concentration of 5% and a caustic soda aqueous solution having a concentration of 4% were added thereto to adjust the pH to 11 to 12. After the pH was adjusted, the inside of the bleacher was stirred for 1 hour while maintaining the internal temperature at 90 ± 5 ° C to perform primary bleaching treatment.

After the primary bleach-treated residue, the residue was transferred to a conveyor, charged into a second bleaching machine having a capacity of 2.8 m < 3 >, and secondary bleaching treatment was carried out under the same conditions as the primary bleaching treatment.

Next, the residue of the second bleaching treatment was transferred to a conveyor, and the third bleaching process was performed under the same condition as that of the second bleaching process.

The bleaching treatment residue was transferred to a screen to remove moisture, and then the bleaching agent was introduced into a cyclone type cleaner to remove foreign matter and finally dehydrate to produce a pulp.

The weight of the mugwort was 120 kg, and the weight of the pulp was measured as 102 kg, indicating that the pulp was produced at a yield of 85%.

The safety evaluation of the pulp thus produced, heavy metal adsorption performance, and physical property evaluation were carried out as follows.

<Safety evaluation>

In order to apply the pulp to cosmetics such as mask packs, it was inspected by Korea Research Institute of Chemical Fusion Test to confirm the detection of lead, arsenic, antimony, cadmium, mercury, methanol and formaldehyde. As a result, as shown in FIG. 2, the amount below the reference value was detected in all items, and it was found that there was no problem in safety for application to cosmetics.

The general hazard evaluation result of the pulp is shown in Fig. 3, and in the analysis items such as sulfate, acetic acid, chlorine, sodium hydroxide, benzene, toluene, ethylbenzene and xylene, .

These results indicate that the production method of the present invention is obtained because the amount of the chemical used is extremely small.

<Heavy Metal Adsorption Performance>

To evaluate the heavy metal adsorption performance of the pulp, 100 mg / l of heavy metal aqueous solution was prepared using a standard solution containing 1,000 mg / l of lead and cadmium respectively. 1 g of pulp was placed in a Petri dish, and 50 ml of the heavy metal aqueous solution was added thereto.

The sample was placed in an oven at 37 ° C., and allowed to stand for 30, 60, or 90 minutes. 15 ml of the sample was collected by time, and the result was measured by ICP-OES. For comparison, cotton was also measured under the same conditions as above.

Referring to the graph of FIG. 2 (a), when the amounts of lead adsorbed on the blank, the cotton, and the pulp of the examples were compared, the pulp according to the Examples showed much better adsorption performance of lead. As shown in FIG. 2 (b), the lead amount was 20% or more lower than that of cotton, indicating that the pulp according to the present invention had excellent heavy metal adsorption performance.

In addition, referring to the graph of FIG. 3 (a), when the amounts of lead adsorbed on the blank, the cotton and the pulp of the examples were compared, the pulp according to the examples showed excellent adsorption performance of cadmium. The amount of residual cadmium compared to the blank showed a cadmium level of 20% or more lower than that of cotton as shown in FIG. 3 (b), indicating that the pulp according to the present invention had excellent heavy metal adsorption performance.

&Lt; Evaluation of physical properties &

The basis weight, tensile strength, elongation, moisture content and transparency were measured to evaluate the physical properties of the pulp according to the examples. The analysis was carried out by Korea Institute of Industrial Technology, and the results are shown in Table 1.

Evaluation index sample water Measurement result How to measure Basis weight (g / ㎡) 6 40 to 50 ASTM D3776-96 Tensile strength (N / 5 cm) 6 > 100 EDANA20.2-89 Elongation (%) 6 > 28 EDANA20.2-89 Thickness (%) 6 > 200 BP2007 transparency(%) 6 <60 CIE color coordinate L *

As a result of the measurement, it can be seen that similar values are shown in terms of basis weight, tensile strength, elongation, transparency and the like compared to the prior art Korean Patent Publication No. 10-1547101. This is a result indicating that the manufacturing method of the present invention can produce a high-quality pulp in a continuous process without using an acidic solution.

Therefore, the production method of the present invention is a method for producing a high-quality pulp in large quantities using a green algae as a raw material, and has been grasped as a method capable of producing a pulp that can be widely used for cosmetics, kitchen utensils, household goods, and the like.

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:
110: shaft 120: impeller
130: Baffle 140: Filter net
200: raw material inlet 210: steam inlet
220: discharge port 230: material discharge port

Claims (5)

Feeding the residue of the mugwort residue to an extractor;
Extracting and applying thermal energy and mechanical energy to the residues of the leaves;
Bleaching the residue of the extract of Treponose fulgaris;
/ RTI &gt;
Wherein the extracting process is performed using an extractor,
The extractor applies mechanical energy by a stirrer composed of a shaft 110 and an impeller 120 driven by a motor,
The extractor has a filter net 140 and an outlet 220 for discharging impurities to the lower part of the extractor body 100. A plurality of baffles 130 are installed on a wall surface of the extractor, Wherein the steam inlet (210) is provided in the steam inlet (210).
delete The method according to claim 1,
Wherein the extracting step is performed in the extractor at a temperature of 100 to 120 DEG C and an atmospheric pressure for 1 to 3 hours.
The method according to claim 1,
Wherein the bleaching treatment is carried out once to three times using an aqueous hydrogen peroxide solution and a caustic soda aqueous solution.
The method according to claim 1,
Wherein the amount of the pulp produced is 80% or more of the weight of the residue of the residue.

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