WO2023024365A1 - Procédé de préparation de charbon actif en utilisant de la noix d'arec et une boue comme matériaux - Google Patents

Procédé de préparation de charbon actif en utilisant de la noix d'arec et une boue comme matériaux Download PDF

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WO2023024365A1
WO2023024365A1 PCT/CN2021/141013 CN2021141013W WO2023024365A1 WO 2023024365 A1 WO2023024365 A1 WO 2023024365A1 CN 2021141013 W CN2021141013 W CN 2021141013W WO 2023024365 A1 WO2023024365 A1 WO 2023024365A1
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sludge
activated carbon
mixed
betel nut
product
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PCT/CN2021/141013
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Chinese (zh)
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衣雪松
林德鑫
陈俣良
杨飞
王旭
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海南大学
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    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
    • C01B32/00—Carbon; Compounds thereof
    • C01B32/30—Active carbon
    • C01B32/312—Preparation
    • C01B32/342—Preparation characterised by non-gaseous activating agents
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
    • C01B32/00—Carbon; Compounds thereof
    • C01B32/30—Active carbon
    • C01B32/312—Preparation
    • C01B32/318—Preparation characterised by the starting materials
    • C01B32/324—Preparation characterised by the starting materials from waste materials, e.g. tyres or spent sulfite pulp liquor
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
    • C01B32/00—Carbon; Compounds thereof
    • C01B32/30—Active carbon
    • C01B32/312—Preparation
    • C01B32/342—Preparation characterised by non-gaseous activating agents
    • C01B32/348—Metallic compounds

Definitions

  • the application relates to the field of activated carbon, in particular to a method for preparing activated carbon using areca nuts and sludge as materials.
  • Sewage sludge is a by-product of sewage treatment. About 50% of the weight of sewage sludge is organic matter, most of which are hemicellulose, cellulose, lignin, lipids and proteins, which can be utilized as resources.
  • Lignocellulosic materials such as coconut shells, corn stalks, sawdust, plant stalks, and betel nuts, etc.
  • activated carbon materials containing a large amount of organic matter and rich in carbon can be prepared simply by pyrolysis process with large specific surface area, stable physical and chemical properties and Activated carbon with excellent adsorption capacity.
  • these cellulose-rich materials have the advantages of abundant sources, renewable, low cost of production raw materials, simple preparation methods, etc., and have excellent properties compared with traditional materials (such as coal, petroleum, etc.).
  • traditional materials such as coal, petroleum, etc.
  • lignocellulosic materials are added to sludge precursors to enhance the performance of activated carbon, especially lignocellulosic materials (e.g. coconut shells, etc.) readily available from pharmaceutical sources.
  • the main methods of synthesizing activated carbon are chemical activation, physical activation and the combination of the two.
  • activated gases such as carbon dioxide, air, or water vapor are used during pyrolysis to etch the surface of carbon substrates at high temperature, i.e., causing significant changes in the morphology and pore structure of the carbon substrates.
  • the activated carbon produced by physical activation is mainly microporous activated carbon, but the operating conditions of physical activation (high temperature and high energy consumption) limit its industrial application, and the surface will be severely burned, which reduces the carbon production rate.
  • the chemical activation process is well established and involves the use of alkali metals, acids and salts such as KOH, NaOH, H 3 PO 4 , H 2 SO 4 , ZnCl 2 and CaCl 2 .
  • Chemical activation causes swelling, dehydration, and aromatic condensation of activated carbon and carbon to form a large and uniform mesoporous structure and high specific surface area.
  • physical activation methods chemical methods have lower energy and time consumption and higher efficiency. Lin et al. observed that co-pyrolysis of oil palm solid waste and paper sludge at low temperature enhanced thermochemical reactivity. They are attributed to hydrogenation and thermocatalysis.
  • these mixed activated carbons are low in preparation cost and are beneficial to the treatment of environmental pollution. They can not only meet the reduction, harmlessness, resource utilization and stabilization of a large amount of urban sludge, but also "turn waste into treasure”. And treating waste with waste, which brings environmental benefits and promotes economic benefits at the same time, is a very meaningful research direction.
  • the performance of synthetic activated carbon prepared from existing sludge is not good enough, the adsorption capacity is not strong enough, and the yield is low. Therefore, it is necessary to mix betel nut and sludge to prepare activated carbon, which can not only improve the adsorption performance and yield, but also reduce environmental pollution by waste utilization.
  • the present application proposes a method for preparing activated carbon using areca nuts and sludge as materials to overcome the deficiencies in the prior art.
  • a kind of method that utilizes betel nut and sludge to prepare gac for material comprises the following steps:
  • Raw material preparation mix and dry areca nuts and sludge, crush and sieve to obtain mixed particles of betel nuts and sludge;
  • step S2 high-temperature carbonization: place the betel nut and sludge mixed particles obtained in step S1 in a tube furnace, and carry out carbonization initial treatment in a nitrogen atmosphere.
  • the carbonization temperature is 600-700 ° C, and the carbonization time is 30-90 minutes.
  • activator soaking get the betel nut after the carbonization of step S2 and the mixed sludge of sludge and mix with activator aqueous solution, described activator aqueous solution is made by phosphoric acid, zinc chloride and water, the content of zinc chloride in described activator aqueous solution The concentration is 2.0-3.5mol/L, and the concentration of phosphoric acid is 2.5-3.5mol/L; the mass volume ratio of the betel nut and sludge mixed particles to the activator aqueous solution is 1:2.0-3.0, and soaked for 12 -48h, obtain mixed product;
  • step S4 High-temperature activation: put the mixed product activated in step S3 into a tube furnace, and activate it in a nitrogen atmosphere, wherein the activation temperature is 700-800°C, the activation time is 0.5-2h, and the crude product is obtained after cooling;
  • step S5 the crude product in step S4 is pickled, washed with water, and dried to obtain the target activated carbon product.
  • step S1 the betel nut and the sludge are mixed and dried until the water content is 10%-20%.
  • step S1 the mesh size of the sieve is 100-200 mesh.
  • step S2 the temperature is raised to 600-700° C. at a rate of 10-20° C./min for carbonization.
  • step S3 the soaking temperature is 20-33°C.
  • step S4 the temperature is raised to 700-800° C. at a heating rate of 10-20° C./min for activation.
  • step S5 repeatedly washing the crude product with hydrochloric acid and distilled water to remove inorganic substances, and then drying at 105° C. to constant weight.
  • step S3 the concentration of zinc chloride in the aqueous solution of the activator is 3.0mol/L, and the concentration of phosphoric acid is 3.0mol/L; the mass volume ratio of the mixed particles of betel nut and sludge to the aqueous solution of the activator is kg/ L is 1:2.0.
  • step S3 the soaking time is 20h.
  • step S4 the activation temperature is 800° C., and the activation time is 1 h.
  • This application adopts the blending of betel nut and sludge, conducts preliminary carbonization at a specific carbonization temperature condition, then uses a certain amount of phosphoric acid, zinc chloride and water to make an activator aqueous solution for soaking, and then activates it at a specific activation temperature condition, Finally, it is washed and dried to obtain betel nut sludge activated carbon, which has the advantages of rich pore structure, large specific surface area, strong iodine adsorption capacity, and high yield.
  • the preparation method of the present application has the characteristics of low energy consumption and simple operation, so the preparation method of the present application is suitable for wide application, and can be preferably used as an adsorbent for wastewater treatment, gas purification technology and energy storage, and realizes waste treatment and resource utilization. use.
  • the application soaks the carbonized betel nut and sludge mixed particles in a certain amount of activator aqueous solution (composed of ZnC1 2 , H 3 PO 4 and water) at room temperature, which can well enhance the carbonized carbon particles. Pore structure and specific surface area can reduce ash content and reduce energy consumption; it is also conducive to the formation of pores and the generation of volatile tar. Mainly use H 3 PO 4 to develop mesopore structure, while ZnCl 2 develops microporous structure; among them, ZnC1 2 and H 3 PO 4 can dehydrate, can promote pyrolysis reaction, reduce the emission of soot gas, and produce graphite with a large number of micropores Crystal structure.
  • activator aqueous solution composed of ZnC1 2 , H 3 PO 4 and water
  • This application adopts specific activation temperature and activation time to further control the micropore and mesopore structure of activated carbon.
  • the method can effectively reduce the preparation cost of the activated carbon adsorbent, reduce the preparation process in the conventional process, improve the adsorption performance, reduce the reaction time, reduce the cost and equipment loss.
  • Figure 1 (a) (500 ⁇ ) and (b) (5000 ⁇ ) scanning electron microscope images of activated carbon;
  • Figure 6 The influence of solid-liquid ratio factors on the yield and iodine value of activated carbon.
  • Embodiment 1 betel nut sludge activated carbon preparation
  • Reagents such as ZnCl 2 , H 3 PO 4 , sodium thiosulfate, iodine, potassium iodide, and hydrochloric acid were all chemically pure; activated sludge, betel nut (local direct sampling).
  • Electric blast drying oven tube furnace, crucible, electronic precision balance, nitrogen cylinder, glass instrument, etc.
  • Raw material preparation wash the whole betel nut fruit with water to remove surface dirt, mix and dry the betel nut and sludge according to the mass ratio of 1:1 until the moisture content is 10%-20%, and the drying temperature is 105°C ⁇ 5°C; crush the dried product and pass through a 100-200 mesh sieve to obtain mixed particles of betel nut and sludge;
  • step S2 High-temperature carbonization process: place the mixed particles of betel nut and sludge obtained in step S1 in a tube furnace, and carry out carbonization treatment in a nitrogen atmosphere. The heating rate was raised to 700°C for 60 minutes of carbonization, and finally cooled to room temperature to obtain carbonized betel nut and sludge mixed particles;
  • activator soaking take the carbonized betel nut and sludge mixed particles obtained in step S2 and mix them with the activator aqueous solution according to the mass volume ratio kg/L of 1:2.0, wherein the activator aqueous solution is composed of phosphoric acid, zinc chloride and water Prepared, the concentration of zinc chloride in the activator aqueous solution is 3.0 mol/L, the concentration of phosphoric acid is 3.0 mol/L, after mixing and stirring evenly, soaking at 20-33 ° C for 20 hours to obtain a mixed product;
  • step S4 High-temperature activation: Put the mixed product activated in step S3 into a tube furnace, activate it in a nitrogen atmosphere, and heat it up to 800°C at a heating rate of 10-20°C/min from room temperature 20-33°C Activation for 1 hour; finally, cool the furnace to below 100°C, and continuously feed nitrogen into the tube furnace, and naturally cool to room temperature 20-33°C under a nitrogen atmosphere to take out the product to obtain a crude product;
  • step S5 finished product: take the crude product obtained in step S4, carry out pickling, water washing, and dry, obtain target activated carbon product; Specific operation: the crude product obtained is washed repeatedly with 1M hydrochloric acid and distilled water, to remove ZnCl and Other inorganic substances are then dried at 105°C to constant weight, which is the product of betel nut sludge activated carbon.
  • the iodine value is an index to characterize the adsorption capacity of activated carbon. The higher the iodine value, the stronger the adsorption capacity of the prepared activated carbon. Refer to the national standard GB/T 12496.8-2015 to test the iodine value of the product to obtain the microscopic surface information of activated carbon. The results show that the betel nut sludge activated carbon product of embodiment 1 has an iodine value of 723.19mg/g.
  • the betel nut sludge activated carbon has a well-developed irregular surface and is rich in loose texture.
  • the reason for this phenomenon is as follows: During the carbonization process, the activated carbon forms a preliminary network structure, which accelerates the further corrosion of the pores and the deeper pore structure during the activation process. This result shows that the areca nut sludge activated carbon prepared in Example 1 of the present application can effectively increase the surface area of activated carbon. Therefore, pyrolysis at 800 °C leads to more pores, widens the pores into macropores, and promotes the transformation of organic molecules into a well-developed porous structure.
  • the adsorption and desorption isotherms and pore size distribution of the areca nut sludge activated carbon prepared in Example 1 of the present application are shown in Figure 2 .
  • the adsorption of nitrogen in the low-pressure area may be related to the adsorption of the single layer of micropores, and the adsorption amount of nitrogen can reach 175cm 3 /g.
  • Obvious hysteresis loops (0.4 ⁇ P/P 0 ⁇ 1.0) were observed in the relative pressure region, which is considered to be characteristic of mesoporous materials.
  • the isotherm shows the H4 hysteresis loop, revealing the existence of parallel slit pores formed by the accumulation of sheet-like carbon.
  • the pore size distribution can directly reveal the pore properties of activated carbon.
  • the classification defined by IUPAC also includes micropores (diameter ⁇ 2nm), mesopores (2-50nm) and macropores (diameter>50nm).
  • micropores diameter ⁇ 2nm
  • mesopores 2-50nm
  • macropores diameter>50nm
  • a broad peak appears in the range of 5-50nm, indicating that activated carbon
  • micropores and macropores are micropores and macropores.
  • the S tot and V tot of the betel nut sludge activated carbon prepared in this application are 777.32m 2 /g and 0.79cm 3 /g respectively, indicating that the prepared product has a relatively high specific surface area and can absorb pollutants well.
  • the micropore volume of the areca nut activated carbon prepared by the present application and its proportion in the total pore volume are relatively large. This means that the pore structure and surface area of activated carbon are greatly improved due to the co-pyrolysis at 800 °C.
  • the activation process mainly includes the contact between the activator and the carbonized product and the change process of the pore structure after carbonization.
  • Activation temperature is a key factor in the preparation of high-performance activated carbon. On the basis of Example 1, the activation temperatures were adjusted to 400°C, 500°C, 600°C, 700°C, 800°C, and 900°C. The iodine values and yields at different activation temperatures are shown in Figure 3.
  • the iodine value increases rapidly with the activation temperature from 400 °C to 800 °C, but when the temperature exceeds 800 °C, the iodine value decreases. This may be due to the increased diffusion of activated molecules into the interior of the carbonized product at higher temperatures; thus, more carbons were activated with phosphoric acid and hydrogen chloride, resulting in a rich pore structure. Excessively high activation temperature will also destroy the network structure of carbon, which should be avoided when synthesizing porous materials. In addition, the yield decreased with increasing activation temperature. This is because organic matter is continuously decomposed in the form of gas as carbon is consumed. In summary, the preferred activation temperature is 700-800°C, and the activation temperature is 800°C is the best condition for synthesizing activated carbon, its iodine value is 723.19mg/g, and the yield is 45.3%.
  • Example 1 On the basis of Example 1, the activation time was adjusted to be 30-120 minutes respectively.
  • the iodine value of AC increased sharply from 545.69 mg/g to 634.72 mg/g before 60 minutes, and then decreased from 634.72 mg/g to 493.99 mg/g.
  • a better iodine value of 634.72 mg/g was exhibited with a yield of 51% as the carbonized precursor was obtained at 600°C for 60 minutes.
  • the reason may be that the shorter the activation time, the incomplete activation, and the lower the adsorption capacity; the highly developed pore structure needs enough time to stimulate micropore corrosion to meet the adsorption demand; and the prolonged activation time has a negative impact on the formation of pores, It even causes adjacent micropores to expand into pores.
  • the activation time ranging from 30 min to 120 min, a continuous decrease in yield could be observed, which may be due to further decomposition of organic and inorganic salts in the material.
  • the preferred activation time is 50-70 minutes, and the most preferred activation time is 60 minutes.
  • the activator In addition to reacting with the carbon precursor to generate pores, the activator also plays an important role in oxidation and dehydration during the preparation process. Some activators can remain in the micropores and mesopores to prevent pore collapse.
  • This application studies the influence of different concentrations of mixed activator (phosphoric acid and zinc chloride) solutions on iodine value and yield.
  • adjust the concentrations of zinc chloride and phosphoric acid in the activator aqueous solution to be 1.0mol/L, 1.5mol/L, 2.0mol/L, 2.5mol/L, 3.0mol/L, 3.5mol/L , 4.0mol/L, 4.5mol/L.
  • the experimental data show that with the increase of activator concentration, 3.0mol/L mixed activator can provide better conditions for the preparation of activated carbon with high iodine value (607.88mg/g), and its yield is 59.44%. This may be because the mixed activator reacts with the oxygen-containing functional groups on the surface of the previously carbonized product to form a large number of pores, which is different from the basic activator. The concentration of the mixed activator exceeding 3.0mol/L obviously leads to the decrease of the iodine value of the blended activated carbon.
  • the solid-to-liquid ratio is critical to the development of pores in adsorbent materials.
  • the solid-to-liquid ratio kg/L of the carbonized betel nut and sludge mixed particles and the activator aqueous solution were adjusted to be 1:1.0, 1:1.5, 1:2.0, 1:2.5, 1:3.0, 1:3.5.
  • the iodine value of activated carbon varies with the change of solid-liquid ratio.
  • the solid-to-liquid ratio is less than 1:2.0, almost no activator participates in the formation of carbon skeleton and the development of pores, so the iodine value is relatively low.
  • the iodine value decreases and reaches the maximum value (624.9 mg/g), with a yield of 57.6%.
  • the preferred solid-to-liquid ratio is 1:2.0-3.0, and the most preferred solid-to-liquid ratio is 1:2.0.
  • Embodiment 6 betel nut sludge activated carbon preparation
  • High-temperature carbonization process place the betel nut and sludge mixed particles obtained in Example 1 in a tube furnace, and carry out carbonization treatment in a nitrogen atmosphere.
  • the tube furnace starts at a room temperature of 20-33° C.
  • the heating rate was raised to 600°C for 90 minutes of carbonization, and finally cooled to room temperature to obtain carbonized betel nut and sludge mixed particles;
  • activator soaking take the carbonized betel nut and sludge mixed particles obtained in step S2 and mix the activator aqueous solution according to the mass volume ratio kg/L of 1:3.0, wherein the activator aqueous solution is composed of phosphoric acid, zinc chloride and water Prepared, the concentration of zinc chloride in the activator aqueous solution is 2.0mol/L, the concentration of phosphoric acid is 2.5mol/L, after mixing and stirring evenly, and soaking at 20-33°C for 12h, a mixed product is obtained;
  • step S4 High-temperature activation: put the mixed product activated in step S3 into a tube furnace, and activate it in a nitrogen atmosphere. From a room temperature of 20-33°C, heat it up to 700°C at a heating rate of 10-20°C/min and keep it warm Activation for 2 hours; finally, cool the furnace to below 100°C, and continuously feed nitrogen into the tube furnace, and naturally cool to room temperature 20-33°C under a nitrogen atmosphere to take out the product to obtain a crude product;
  • step S5 finished product: take the crude product obtained in step S4, carry out pickling, water washing, and dry, obtain target activated carbon product; Specific operation: the crude product obtained is washed repeatedly with hydrochloric acid and distilled water, to remove ZnCl and other The inorganic matter is then dried at 105°C to constant weight, which is the betel nut sludge activated carbon product, with a yield of 48.00% and an iodine value of 661.15mg/g.
  • Raw material preparation Wash the selected betel nuts with water to remove surface dirt, mix and dry the betel nuts and sludge until the moisture content is 10%-20%, and the drying temperature is 105°C ⁇ 5°C; The product is crushed and passed through a 100-200 mesh sieve to obtain mixed particles of betel nut and sludge;
  • step S2 High-temperature carbonization process: place the mixed particles of betel nut and sludge obtained in step S1 in a tube furnace, and carry out carbonization treatment in a nitrogen atmosphere. The heating rate was raised to 700°C for 30 minutes of carbonization, and finally cooled to room temperature to obtain carbonized betel nut and sludge mixed particles;
  • activator soaking take the carbonized betel nut and sludge mixed particles obtained in step S2 and mix them with the activator aqueous solution according to the mass volume ratio kg/L of 1:2.0, wherein the activator aqueous solution is composed of phosphoric acid, zinc chloride and water Prepared, the concentration of zinc chloride in the activator aqueous solution is 3.5 mol/L, the concentration of phosphoric acid is 2.5 mol/L, after mixing and stirring evenly, soaking at 20-33 ° C for 48 hours to obtain a mixed product;
  • step S4 High-temperature activation: Put the mixed product activated in step S3 into a tube furnace, activate it in a nitrogen atmosphere, and heat it up to 800°C at a heating rate of 10-20°C/min from room temperature 20-33°C Activation for 0.5h; finally, cool the furnace to below 100°C, and continuously feed nitrogen into the tube furnace, and naturally cool to room temperature 20-33°C under a nitrogen atmosphere to take out the product to obtain a crude product;
  • step S5 finished product: take the crude product obtained in step S4, carry out pickling, water washing, and dry, obtain target activated carbon product; Specific operation: the crude product obtained is washed repeatedly with hydrochloric acid and distilled water, to remove ZnCl and other The inorganic matter is then dried at 105°C to constant weight, which is the betel nut sludge activated carbon product, with a yield of 57.62% and an iodine value of 675.94 mg/g.
  • the main difference between this Comparative Example 1 and Example 1 is that the carbonization temperature in step S2 is 500° C., and the carbonization time is 120 min.
  • step S3 is prepared from zinc chloride and water with a concentration of 3.0 mol/L.
  • the activator aqueous solution in step S3 is prepared from phosphoric acid and water, with a concentration of 3.0 mol/L.
  • step S3 the activator aqueous solution in step S3 is prepared from zinc chloride, H 2 SO 4 and water, and the concentrations of zinc chloride and H 2 SO 4 are both 3.0 mol/L.
  • the activator aqueous solution in step S3 is prepared from calcium chloride, phosphoric acid and water, and the concentrations of calcium chloride and phosphoric acid are both 3.0 mol/L.
  • Comparative Example 1 it can be known that the preparation of activated carbon from sludge not only has a low yield, but also has a very low iodine value and low application value.
  • Comparative Example 2 it can be seen that the preparation of activated carbon from betel nut has a high yield and high iodine value, but its preparation cost is high, which is not conducive to popularization and application.
  • the betel nut sludge activated carbon product obtained in the embodiment of the present application has a strong iodine value adsorption capacity, and the product yield is maintained at about 50%, which has high application value, and at the same time, the production cost is low, which is conducive to popularization and application, and maximizes the use value of the sludge. , and good for the environment.
  • the iodine value adsorption capacity of Example 1 is relatively high, and Comprehensive Evaluation Example 1 is the preferred solution.
  • Comparative Example 3 has lower carbonization temperature and longer carbonization time, and the iodine value adsorption capacity of the obtained product is obviously decreased.
  • comparative example 4 uses activator aqueous solution to only be made by zinc chloride and water
  • comparative example 5 uses activator aqueous solution to only be made by phosphoric acid and water
  • comparative example 6 utilizes sulfuric acid to replace phosphoric acid
  • comparative example 7 Calcium chloride replaces zinc chloride, and the iodine value adsorption capacity of its obtained product all drops obviously.
  • This application uses a certain amount of activator aqueous solution (composed of ZnC1 2 , H 3 PO 4 and water) for soaking to effectively improve the performance of betel nut sludge activated carbon.
  • Document [1] prepared activated carbon by blending coconut shell and sludge.
  • the iodine value of the areca nut sludge activated carbon prepared by the application was compared with the coconut shell sludge activated carbon prepared by the document [1] .

Abstract

Procédé de préparation de charbon actif en utilisant une noix d'arec et de la boue comme matériaux. Le procédé comprend les étapes suivantes : S1. préparation des matières premières, impliquant le mélange et le séchage de noix d'arec et d'une boue, leur concassage et criblage, afin d'obtenir des granules mixtes de noix d'arec et de boue; S2. carbonisation à haute température, impliquant la mise en place des matières premières mixtes dans un four tubulaire, exécution d'un traitement primaire de carbonisation sous une atmosphère d'azote; S3. immersion dans un activateur, impliquant le mélange des granules mixtes de la noix d'arec et la boue après carbonisation avec une solution aqueuse d'activateur, la solution aqueuse d'activateur étant préparée à partir d'acide phosphorique, de chlorure de zinc et d'eau, une bonne agitation et un trempage, afin d'obtenir un produit mixte; S4. activation à haute température, impliquant la mise en place du produit mixte dans un four tubulaire, son activation sous une atmosphère d'azote, son refroidissement pour obtenir un produit brut; et S5. obtention d'un produit final, impliquant la soumission du produit brut à un lavage acide, le lavage avec de l'eau et le séchage, afin d'obtenir un produit cible de charbon actif. Le charbon actif de noix d'arec-boue préparé par le procédé présente les avantages d'une diversité de structures de pore, d'une grande surface spécifique, d'une capacité élevée d'adsorption de l'iode et d'un rendement élevé. En outre, le procédé consomme peu d'énergie et est simple à faire fonctionner.
PCT/CN2021/141013 2021-08-25 2021-12-24 Procédé de préparation de charbon actif en utilisant de la noix d'arec et une boue comme matériaux WO2023024365A1 (fr)

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