KR20210092392A - Method for preparing active carbon from lignin and polymer composites comprising active carbon prepared the same - Google Patents

Abstract

The present invention relates to a method for preparing lignin-derived active carbon, including the steps of: (a) ultrasonicating lignin to obtain lignin free from impurities; (b) mixing the lignin free from impurities with a base to prepare a mixture; and (c) carbonizing the mixture under a mixed gas of argon (Ar) with hydrogen (H_2) to obtain active carbon. According to the method of the present invention, lignin, a waste biological byproduct, can be utilized efficiently as an eco-friendly material, and the active carbon has a significantly improved specific surface area as compared to conventional active carbon obtained by acid treatment. When the active carbon is used to form a composite with a polymer, such as polyurethane, the resultant composite can be applied to automotive polymer materials or industrial parts to adsorb contaminants, such as volatile organic compounds. Therefore, it is possible to reduce contaminants generated from the parts.

Description

A method for producing lignin-derived activated carbon and a polymer composite material comprising the activated carbon prepared accordingly {Method for preparing active carbon from lignin and polymer composites comprising active carbon prepared the same}

The present invention relates to a method for producing lignin-derived activated carbon and to a polymer composite material comprising the activated carbon prepared thereby, and more particularly, to a method for producing activated carbon from lignin, which is wood waste, to prepare activated carbon, and applying it to a polymer composite material for automobile parts or various It relates to a method for producing lignin-derived activated carbon, which can be manufactured as an industrial component, and a polymer composite material comprising the activated carbon prepared accordingly.

Lignin is one of the main components of lignocellulose biomass along with cellulose and hemi-cellulose. Lignin fills the gap between cellulose and hemicellulose in plants, acting as an adhesive that holds the lignocellulosic matrix together and imparts strength and stiffness to the cell wall. Lignin constitutes 15-35% of wood and has the highest specific energy content compared to cellulose and hemicellulose. It is also rich in renewable natural aromatics and is the only biopolymer that can serve as a sustainable feedstock for aromatic chemicals. Therefore, the economics of the future lignocellulosic biorefinery depend on the conversion of cellulose and lignin into high value-added compounds. Lignin is an amorphous polymer crosslinked by random polymerization of three major phenyl propane monomers bonded together via different C-O-C and C-C monomer bonds. Lignin holds potential as a renewable source of fuel and aromatic chemicals. However, technology for solubilizing lignin is still underdeveloped compared to polysaccharides. High affinity for the formation of condensed structures during heat treatment, poor product selectivity, and ease of use as solid fuels, difficulties in catalytic processing due to the presence of various interunit bonds are problems of lignin-based biorefining technology. Large quantities of lignin can be used in pulp mills and future biorefining plants. The lignin conversion process will open new avenues for the production of low-carbon biofuels and aromatics currently using fossil fuels.

About 98% of the total lignin is burned to improve the energy balance of the main process, and only a small amount, about 1-2%, is used to make valuable products. The utilization of lignin is in the fine chemicals, polymer industry, pharmaceuticals, additives, etc. In addition, lignin is used as a polymer carrier for binders, plasticizers, adsorbents, composites, food preparation additives and biologically active agents. Lignin has also been studied as an additive for concrete, feed additives and phenolic resins, and is being studied in relation to advanced composites and other organic and inorganic polymers.

Lignin is known as a powerful antioxidant because it contains phenolic hydroxyl groups. Studies are being conducted to selectively cut the bonds of lignin polymers or modify the bonds of lignin polymers to use them in various fields. In addition, research using lignin derivatives as a component for manufacturing microcapsules or using the antioxidant function of lignin in medicine and pharmaceutical fields is ongoing. Research on lignin at home and abroad is mostly conducted on adsorbents, plasticizers, carbon fiber, etc., and research on lignin pretreatment for cellulose production or bioethanol production is also in progress.

As such, it is very necessary to study the technology to be applied to various industrial fields using lignin, which is an inexpensive and abundant resource.

Japanese Patent No. 5,091,352

An object of the present invention is to significantly improve the surface area of activated carbon compared to the prior art by manufacturing activated carbon under specific conditions using lignin, which is an inexpensive and abundant resource, so that it can be applied to automobile materials or various industrial parts, such as harmful volatile organic compounds (VOCs), etc. An object of the present invention is to provide a method for producing lignin-derived activated carbon capable of exhibiting a material reduction effect, and activated carbon prepared accordingly.

Another object of the present invention is to provide a polymer composite material in which lignin-derived activated carbon prepared according to the present invention is complexed with lignin-derived activated carbon, which can be used as a replacement for conventional commercial fillers or for automobile parts and various industrial parts.

According to one aspect of the invention,

(a) sonicating the lignin to obtain lignin from which impurities are removed;

(b) preparing a mixture by mixing the lignin from which the impurities have been removed and a base; and

(c) preparing activated carbon by carbonizing the mixture under a mixed gas of argon (Ar) and hydrogen (H ₂ ); A method for producing activated carbon derived from lignin is provided.

In step (a), the ultrasonic treatment may be performed in a frequency range of 10 to 100 kHz.

In step (a), the ultrasonic treatment may be performed at a temperature of 0 to 80° C. for 10 minutes to 4 hours.

In step (b), the base may be any one selected _{from NaOH, KOH, NH 4} OH, NH(CH ₃ ) ₂ , N(CH ₃ ) ₃ , and Ca(OH) _{2 .}

In step (b), the mutual lignin and the base may be mixed in a weight ratio of 1:1 to 1:4 to prepare a mixture.

In step (c), the mixed gas may be a mixture of argon (Ar) and hydrogen (H ₂ ) in a weight ratio of 100:2 to 100:6.

In step (c), the carbonization may be performed at 500 to 900 °C.

According to another aspect of the present invention,

It provides lignin-derived activated carbon prepared according to the method for producing lignin-derived activated carbon.

The lignin-derived activated carbon may include a microporous structure and a mesoporous structure.

The micropores may have an average diameter of 0.1 to 2.5 nm, and the mesopores may have an average diameter of 1 to 10 nm.

The lignin-derived activated carbon may have a BET surface area of 1500 to 3000 m ² /g.

According to another aspect of the present invention,

There is provided a polymer composite material in which the lignin-derived activated carbon and a polymer material are complexed.

The polymer material may be any one selected from polyurethane, polyethylene, polypropylene, and polyamide.

The polymer composite material may be used in automobile polymer materials or industrial parts.

The polymer composite material may be used as a filler.

According to another aspect of the present invention,

There is provided a method for producing a polymer composite material in which lignin-derived activated carbon is complexed, comprising the step of mixing the lignin-derived activated carbon prepared according to the method for producing lignin-derived activated carbon and a monomer and then performing a polymerization reaction to prepare a polymer composite material.

The monomer may be a monomer of any one polymer material selected from polyurethane, polyethylene, polypropylene, and polyamide.

The polymer composite material may be a polyurethane composite material in which lignin-derived activated carbon and polyurethane are complexed.

The manufacturing method of the polyurethane composite material,

(1) preparing lignin-derived activated carbon prepared according to the method of any one of claims 1 to 7;

(2) preparing a polyol mixture by mixing the lignin-derived activated carbon with a polyol; and

(3) polymerizing the polyol mixture and diisocyanate to prepare a polyurethane composite material in which lignin-derived activated carbon is complexed; may include.

In step (2), the polyol mixture may be prepared by mixing lignin-derived activated carbon and polyol in a weight ratio of 0.01:100 to 50:100.

An object of the present invention is to significantly improve the surface area of activated carbon compared to the prior art by manufacturing activated carbon under specific conditions using lignin, which is an inexpensive and abundant resource, so that it can be applied to automobile materials or various industrial parts, such as harmful volatile organic compounds (VOCs), etc. An object of the present invention is to provide a method for producing lignin-derived activated carbon capable of exhibiting a material reduction effect, and activated carbon prepared accordingly.

Another object of the present invention is to provide a polymer composite material in which lignin-derived activated carbon prepared according to the present invention is complexed with lignin-derived activated carbon, which can be used as a replacement for conventional commercial fillers or for automobile parts and various industrial parts.

1 is a flowchart sequentially illustrating a method for producing lignin-derived activated carbon of the present invention.
2 is a process diagram schematically showing the processes of Example 1 and Comparative Examples 1 to 4 of the present invention.
3 is a process diagram schematically showing the processes of Example 2, Comparative Examples 5 and 6 of the present invention.
4 is an analysis result of the average particle size of lignin according to Experimental Example 1.
5 is an adsorption isotherm analysis result of Experimental Example 2.
6 shows the type of adsorption isotherm.
7 is a BET surface area measurement result according to Experimental Example 3.
8 is a Raman spectrum analysis result according to Experimental Example 4.

Since the present invention can apply various transformations and can have various embodiments, specific embodiments are illustrated in the drawings and described in detail in the detailed description. However, this is not intended to limit the present invention to specific embodiments, and it should be understood to include all modifications, equivalents, and substitutes included in the spirit and scope of the present invention. In describing the present invention, if it is determined that a detailed description of a related known technology may obscure the gist of the present invention, the detailed description thereof will be omitted.

1 is a flowchart sequentially illustrating a method for producing lignin-derived activated carbon of the present invention. Hereinafter, a method for producing lignin-derived activated carbon of the present invention will be described with reference to FIG. 1 .

First, lignin is sonicated to obtain lignin from which impurities have been removed (step a).

The ultrasonic treatment is preferably carried out in a frequency range of 10 to 100 kHz, more preferably 15 to 80 kHz, even more preferably 20 to 60 kHz When carried out below the lower limit of the frequency range, the removal of impurities is It may be insufficient, and if the upper limit is exceeded, unnecessary process costs may occur.

The sonication is preferably performed at a temperature of 0 to 80 °C for 10 minutes to 4 hours, more preferably at 20 to 75 °C for 30 minutes to 2 hours, still more preferably at 40 to 70 °C for 40 minutes. to 90 minutes.

When the ultrasonic treatment is performed at a temperature of less than 0° C., it is difficult to sufficiently remove impurities, and when it exceeds 80° C., unnecessary energy may be used. In addition, when the treatment is less than 10 minutes, it is difficult to sufficiently remove impurities, and when it exceeds 4 hours, it may be an unnecessary process.

Thereafter, a mixture is prepared by mixing the lignin from which the impurities are removed and the base (step b).

The base may be any one selected from NaOH, KOH, NH ₄ OH, NH(CH ₃ ) ₂ , N(CH ₃ ) ₃ , and Ca(OH) _{2 , and preferably NaOH.} Base treatment after sonication is used as a dehydrating agent, which serves to prevent the formation of tar (tar_) during the carbonization process.

The lignin and the base are preferably mixed in a weight ratio of 1:1 to 1:4 to prepare a mixture, more preferably 1:2 to 1.3.5, even more preferably 1:2.5 to 1:3.2 can be mixed.

If the weight ratio of the base is less than the lower limit, there may be a problem in that tar is formed during the lignin carbonization process. If the weight ratio of the base exceeds the upper limit, the specific surface area may decrease due to excessive use of a dehydrating agent. there is.

Next, the mixture was mixed with argon (Ar) and hydrogen (H ₂ ) carbonization under a mixed gas to prepare activated carbon (step c).

The mixed gas is preferably a mixture of argon (Ar) and hydrogen (H ₂ ) in a weight ratio of 100:2 to 100:6, and more preferably 100:3 to 100:5.

When the content of hydrogen is less than the lower limit, there may be a problem that the specific surface area is lowered because the reaction between hydrogen molecules and the -OH group of lignin does not occur smoothly, and when the hydrogen content exceeds the upper limit, hydrogen gas is exploded risk may arise.

The carbonization is preferably carried out at 500 to 900 °C, more preferably at 550 to 800 °C, even more preferably at 580 to 700 °C. When carbonization is performed at less than 500 ° C, carbonization may be incomplete, and when it exceeds 900 ° C, pores collapse and the specific surface area is lowered, and the intensity of Raman D peak increases to form a disordered carbon structure. may occur.

In particular, in the method for producing lignin-derived activated carbon according to the present invention, the ultrasonic frequency range in step (a), the temperature and time during ultrasonication, the type of base in step (b), the weight ratio of lignin to the base, step (c) As a result of conducting experiments while varying the weight ratio of argon and hydrogen in the mixed gas and the temperature conditions of carbonization, pores are well formed, specific surface area is large, and complex with polymers when all of the following conditions are satisfied, unlike other conditions. It was found that the properties of the polymer were the best, and the conditions were as follows.

In step (a), the ultrasonic frequency range is 20 to 60 kHz, the sonication is performed at 40 to 70 ° C. for 40 to 90 minutes, and in step (b), NaOH is used as the base, and the lignin and the base are 1:2.5 to 1:3.2, the weight ratio of argon and hydrogen in the mixed gas in step (c) is 100:3 to 100:5, and the carbonization temperature is 580 to 700°C.

Hereinafter, the lignin-derived activated carbon of the present invention will be described.

The lignin-derived activated carbon of the present invention is prepared according to the above-described method for producing lignin-derived activated carbon of the present invention.

The lignin-derived activated carbon is characterized in that it includes a microporous structure and a mesoporous structure.

The micropores may have an average diameter of 0.1 to 2.5 nm, and the mesopores may have an average diameter of 1 to 10 nm. The BET surface area ^{is preferably 1500 to 3000 m 2} /g, more preferably 1700 to 2700 m ² /g, even more preferably 2000 to 2500 m ² /g. Due to the high BET surface area of the lignin-derived activated carbon of the present invention, the adsorption of harmful substances in the air can be performed smoothly.

Hereinafter, the polymer composite material of the present invention will be described.

The polymer composite material of the present invention is characterized in that the above-described lignin-derived activated carbon of the present invention and a polymer material are complexed.

The polymer material may be polyurethane, polyethylene, polypropylene, polyamide, etc., but the scope of the present invention is not limited thereto, and any polymer material that can be used as industrial parts, automobile parts, etc. may be applied.

The polymer composite material may be used in automobile polymer materials or industrial parts. The polymer composite material is preferably used as a filler in the accessory part.

Hereinafter, a method for manufacturing the polymer composite material of the present invention will be described.

The method for producing a polymer composite material of the present invention comprises the steps of preparing a polymer composite by mixing the lignin-derived activated carbon prepared according to the above-described method for producing lignin-derived activated carbon of the present invention and a monomer and then performing a polymerization reaction. .

The monomer may be a monomer of any one polymer material selected from polyurethane, polyethylene, polypropylene, and polyamide.

The polymer composite material may be a polyurethane composite material in which lignin-derived activated carbon and polyurethane are complexed.

The manufacturing method of the polyurethane composite material may be performed by the following method.

The lignin-derived activated carbon prepared according to the method for preparing lignin-derived activated carbon of the present invention is prepared (step 1).

Thereafter, a polyol mixture is prepared by mixing the lignin-derived activated carbon with a polyol (step 2).

At this time, the polyol mixture is preferably mixed with lignin-derived activated carbon and polyol in a weight ratio of 0.01:100 to 50:100, more preferably 0.02:100 to 20:100, even more preferably 0.03:100 to 10 It can be mixed in a weight ratio of :100. When the content of the lignin-derived activated carbon is less than the lower limit, the effect of reducing harmful substances such as volatile organic compounds (VOCs) may be reduced, and when the upper limit is exceeded, the durability of the finally manufactured polyurethane composite material may be reduced.

The polyol mixture and diisocyanate are polymerized to prepare a polyurethane composite material in which lignin-derived activated carbon is complexed (step 3).

Hereinafter, preferred examples are presented to help the understanding of the present invention. However, these examples are for explaining the present invention in more detail, the scope of the present invention is not limited thereby, and it is common in the art that various changes and modifications are possible within the scope and spirit of the present invention. It will be self-evident to those with knowledge.

[Example]

2 is a process diagram schematically illustrating the processes of Example 1 and Comparative Examples 1 to 4 of the present invention, and FIG. 3 is a process diagram schematically illustrating the processes of Example 2, Comparative Examples 5 and 6 of the present invention. With reference to this, Examples 1, 2, and Comparative Examples 1 to 5 of the present invention will be described.

Example 1: Preparation of activated carbon (UA-SKL-Ar)

100 g of Softwood Kraft Lignin (SKL), a by-product generated from softwood pulp, was sonicated at a frequency of 20 kHz at 60° C. for 60 minutes to remove impurities, and then the impurity-removed SKL and NaOH were mixed in a weight ratio of 1:3, , in a carbonization furnace, Ar+H ₂ (96:4 %(V/V)) under a mixed gas at 600, 750, and 900° C. for 60 minutes, respectively, to prepare activated carbon.

Example 2: UA-SKL-Ar + Polyurethane Foam Composite Preparation

Polyol (polypropylene glycols) and activated carbon (UA-SKL-Ar) of Example 1 were mixed in a weight ratio of 100:0.05 at room temperature to prepare a polyol mixture. A polyurethane foam composite was prepared by polymerizing the polyol mixture and isocyanate (TDI).

Comparative Example 1: Preparation of untreated lignin (untreated SKL)

Softwood Kraft Lignin (SKL) used in Example 1 was prepared and no treatment was performed.

Comparative Example 2: Preparation of inactivated lignin (Inactivated SKL)

12 g of Softwood Kraft Lignin (SKL) used in Example 1 was simply carbonized for 60 minutes at 600, 750, and 900° C. under _{N 2 atmosphere to prepare inactive lignin.}

Comparative Example 3: Acid treatment + N ₂ Conditioned activated carbon (AA-SKL-N) production

Softwood Kraft Lignin (SKL) was treated with acid (H ₂ SO ₄ ) to remove impurities instead of sonication, and then carbonized under _{N 2 gas instead of Ar+H 2} (96:4 %(V/V)) mixed gas. Activated carbon was prepared in the same manner as in Example 1, except for one.

Comparative Example 4: Acid treatment + Ar condition activated carbon (AA-SKL- Ar) preparation

Activated carbon was prepared in the same manner as in Example 1, except that Softwood Kraft Lignin (SKL) was acid-treated under the same conditions as in Comparative Example 3 instead of sonication.

Comparative Example 5: Preparation of polyurethane foam

A polyurethane foam was prepared in the same manner as in Example 2, except that activated carbon (UA-SKL-Ar) was not used.

Comparative Example 6: Carbon Black + Polyurethane Foam Composite Preparation

A polyurethane foam composite was prepared in the same manner as in Example 2, except that carbon black was used instead of activated carbon (UA-SKL-Ar).

[Experimental example]

Experimental Example 1: Analysis of average particle size

The average particle size was measured by measuring the particle distribution by a wet method using laser diffraction with respect to untreated SKL, acid-treated SKL in the same manner as in the acid treatment of Comparative Example 1, and SKL ultrasonically treated in the same manner as in Example 1. , the results are shown in FIG. 4 .

According to this, it was found that the average particle size of SKL was about 67 µm, acid-treated SKL was reduced to 61.57 µm, and ultrasonic-treated SKL was reduced to 16 µm. These results show that the average particle size is reduced as impurities such as inorganic substances and tar are removed during acid treatment. In ultrasonic treatment, it can be confirmed that the average particle size is greatly reduced due to the cavitation effect as well as the removal of impurities. .

Experimental Example 2: Analysis of adsorption isotherm

Adsorption isotherm analysis is performed by using a gas physically adsorbed to the surface (nitrogen gas, argon gas, etc.), making the sample at the temperature of liquid nitrogen, and recording the adsorption amount according to the change in pressure (0 to 950 mmHg) at this temperature. and the results are shown in FIG. 5 . 6 also shows the type of adsorption isotherm described in the IUPAC Technical Report.

According to this, it was found that in the case of SKL and the inactivated SKL of Comparative Example 2, there were no pores (nonporous) or macropores were formed (macroporous) in a similar manner to Type ±. In contrast, the activated carbon of Comparative Example 3 (AA-SKL-N), the activated carbon of Comparative Example 4 (AA-SKL-Ar), and Example 1 (UA-SKL-Ar) had micropores in a graph similar to Type °. It was confirmed that the microporous structure or narrow mesopores were formed (mesoporous).

Experimental Example 3: BET surface area measurement

The BET surface area was measured by using the BET formula to calculate the number of molecules of the gas adsorbed by changing the temperature and pressure on the surface of the solid, and the results are shown in FIG. 7 .

Accordingly, comparing the BET surface area, the SKL of Comparative Example 1 was 3.82 m ² /g, the inactivated SKL of Comparative Example 2 at 750 ° C was 109.12 m ² /g, and the AA-SKL-N of Comparative Example 3 was 2273.62 m ² / g, AA-SKL-Ar of Comparative Example 4 is 2445.24 m ² /g, UA-SKL-Ar of Example 1 is 2277.83 m ² /g, SKL of Comparative Example 1 and UA- of Example 1 When SKL-Ar was compared, the specific surface area increased about 600 times.

In addition, when AA-SKL-N of Comparative Example 3 and AA-SKL-Ar of Comparative Example 4 are compared, the specific surface area of AA-SKL-Ar of Comparative Example 4 is about less than that of AA-SKL-N of Comparative Example 3 It was confirmed that it was 10% wider. It is estimated that more pores are formed as the H ₂ molecules of the Ar+H ₂ mixed gas react with the -OH functional group of lignin and fall into water vapor.

In addition, when comparing the specific surface areas of UA-SKL-Ar of Example 1 and AA-SKL-N of Comparative Example 3, it is considered that they are at the same level, so if sonicated instead of acid treatment and _{carbonized under Ar+H 2} mixed gas atmosphere It was found that a specific surface area similar to that in the case of acid treatment can be exhibited.

Experimental Example 4: Raman spectrum analysis

When a strong monochromatic light such as laser light is exposed, a phenomenon in which light of a slightly longer or shorter wavelength is observed in addition to light having the same wavelength as the incident light is called the Raman effect. The Raman spectrum according to the carbonization temperature was analyzed by observation at a wavelength of 514 nm using an Ar-ion laser, and the results are shown in FIG. 8 .

According to this, the Raman spectrum (Raman spectra) can be divided into D peak and G peak, it can be seen that the intensity of the G peak is greater at 600 °C and 750 °C, and it was confirmed that the D peak is larger at 900 °C.

When comparing the ID/IG Ratio, there are not many defect sites up to 750°C, but at high temperatures, the intensity of the D peak becomes stronger, so it seems appropriate to carbonize under conditions within 750°C.

Experimental Example 5: VOCs test of polyurethane foam

For the polyurethane foam composite of Example 2, the polyurethane foam of Comparative Example 5 and the polyurethane foam composite of Comparative Example 6 through GC-MS, HPLC to MS300-55 standard among Hyundai Motor VOCs test standards. After the input, 2L of nitrogen was injected, and the sample was heated in an oven at 65° C. for 2 hours, and then left at room temperature for 30 minutes. The content of organic volatile compounds (VOCs) was evaluated by adsorbing the sample after filling with 1L of nitrogen, and the results are shown in Table 1 below.

According to this, in the polyurethane foam of Comparative Example 5, the content of acrolein was 61.8 μg/m ³ , which violated the current indoor air quality regulations (50 μg/m ^{3 ).} In addition, the polyurethane foam composite with carbon black added in Comparative Example 6 had acrolein content of 40.5 μg/m ³ that satisfies the regulation, but the content of toluene, ethylbenzene, and xylene increased. appeared to be inappropriate. On the other hand, the polyurethane foam composite to which UA-SKL-Ar of Example 2 was added had an acrolein content of 29.7 μg/m ³ , which showed a reduction effect of about 50% compared to the existing polyurethane foam, benzene, toluene, ethylbenzene , and xylene also did not show an increase.

In the above, although embodiments of the present invention have been described, those of ordinary skill in the art can add, change, delete or add components within the scope that does not depart from the spirit of the present invention described in the claims. The present invention may be variously modified and changed by, etc., and this will also be included within the scope of the present invention.

Claims (20)

(a) sonicating the lignin to obtain lignin from which impurities are removed;
(b) preparing a mixture by mixing the lignin from which the impurities have been removed and a base; and
(c) preparing activated carbon by carbonizing the mixture under a mixed gas of argon (Ar) and hydrogen (H ₂ ); A method for producing lignin-derived activated carbon comprising a. According to claim 1,
In step (a), the method for producing lignin-derived activated carbon, characterized in that the ultrasonic treatment is performed in a frequency range of 10 to 100 kHz. According to claim 1,
In step (a), the method for producing lignin-derived activated carbon, characterized in that it is carried out for 10 minutes to 4 hours at a temperature of 0 to 80 ° C. According to claim 1,
In step (b), the base is NaOH, KOH, NH ₄ OH, NH(CH ₃ ) ₂ , N(CH ₃ ) ₃ , and Ca(OH) ₂ Of lignin-derived activated carbon, characterized in that any one selected from manufacturing method. According to claim 1,
In step (b), a method for producing lignin-derived activated carbon, characterized in that the mixture is prepared by mixing the lignin and the base in a weight ratio of 1:1 to 1:4. According to claim 1,
In step (c), the mixed gas is a _{method for producing lignin-derived activated carbon, characterized in that argon (Ar) and hydrogen (H 2} ) are mixed in a weight ratio of 100:2 to 100:6. According to claim 1,
In step (c), the carbonization method for producing lignin-derived activated carbon, characterized in that carried out at 500 to 900 ℃. A lignin-derived activated carbon prepared according to the method of any one of claims 1 to 7. 9. The method of claim 8,
The lignin-derived activated carbon is lignin-derived activated carbon, characterized in that it includes a microporous structure and a mesoporous structure. 10. The method of claim 9,
The micropores have an average diameter of 0.1 to 2.5 nm, and the mesopores have an average diameter of 1 to 10 nm. 9. The method of claim 8,
The lignin-derived activated carbon is lignin-derived activated carbon, characterized in that the BET surface area is 1500 to 3000 m ² /g. A polymer composite material in which the lignin-derived activated carbon of claim 8 and a polymer material are complexed. 13. The method of claim 12,
The polymer material is a polymer composite material, characterized in that any one selected from polyurethane, polyethylene, polypropylene, and polyamide. 13. The method of claim 12,
The polymer composite material is a polymer composite material, characterized in that used for automobile polymer material or industrial parts. 15. The method of claim 14,
The polymer composite material is a polymer composite material, characterized in that used as a filler (filler). A polymer composite material in which lignin-derived activated carbon is complexed, comprising a step of mixing the lignin-derived activated carbon prepared according to any one of claims 1 to 7 and a monomer and then performing a polymerization reaction to prepare a polymer composite material. manufacturing method. 17. The method of claim 16,
The method for producing a polymer composite material, characterized in that the monomer is a monomer of any one polymer material selected from polyurethane, polyethylene, polypropylene, and polyamide. 17. The method of claim 16,
The polymer composite material is a method for producing a polymer composite material, characterized in that the polyurethane composite material in which lignin-derived activated carbon and polyurethane are complexed. 19. The method of claim 18,
The manufacturing method of the polyurethane composite material,
(1) preparing lignin-derived activated carbon prepared according to the method of any one of claims 1 to 7;
(2) preparing a polyol mixture by mixing the lignin-derived activated carbon with a polyol; and
(3) preparing a polyurethane composite material in which lignin-derived activated carbon is complexed by polymerizing the polyol mixture and diisocyanate; 19. The method of claim 18,
In step (2), the polyol mixture is prepared by mixing lignin-derived activated carbon and polyol in a weight ratio of 0.01:100 to 50:100.

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