Waste activated carbon regeneration liquid for mass production and application thereof in carbon supplement process

Abstract

The application discloses a kind of scale production waste activated carbon regeneration liquid and its application in carbon supplementing process, belong to energy chemical industry and environmental protection technical field.The scale production waste activated carbon regeneration liquid is characterized in that, include the following volume percentage components: three-dimensional coupling agent 0.1%-15%, carbon source 2%-70%, activating agent 1%-25%, solvent 1%-60%.The application provides a kind of scale production waste activated carbon regeneration liquid and its application in carbon supplementing process, the waste activated carbon regeneration liquid can supplement waste activated carbon skeleton carbon, enhance mechanical strength, increase micropore quantity and surface functional group, improve activated carbon quality.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of energy chemical industry and environmental protection, and particularly relates to a liquid for regenerating waste activated carbon produced on a large scale and application of the liquid in a carbon supplement process. BACKGROUND

[0002] With the acceleration of industrialization, environmental problems are becoming increasingly prominent. Activated carbon has been widely used in gas purification, water treatment, food decolorization and deodorization due to its developed pore structure, rich surface functional groups, graphite fault electron defects and heteroatom doping. According to statistics, the production of activated carbon in China reached 1.15 million tons in 2023, and the amount of waste activated carbon was also about 1 million tons. The existing waste activated carbon treatment methods mainly include incineration, regeneration and reuse, and landfill. These treatment methods not only cause serious resource waste, but also bring great pressure to environmental protection. With the continuous development of resource recycling concept, the regeneration and reuse of waste activated carbon has gradually become an important means for treating waste activated carbon.

[0003] At present, the widely used waste activated carbon regeneration method mainly includes desorption and decomposition. Among them, the heat regeneration technology and its device in desorption are the most mature, which have been applied on an industrial scale. However, the existing heat regeneration technology still has many deficiencies. The regenerated activated carbon usually faces the problems of large carbon loss and low performance recovery rate, and its mechanical strength is poor, which leads to serious loss of pore volume, so that the performance of the regenerated activated carbon is difficult to meet the actual application requirements. How to effectively improve the quality of the regenerated carbon has become a technical problem to be solved in the current activated carbon regeneration industry. SUMMARY

[0004] The present application aims to provide a liquid for regenerating waste activated carbon produced on a large scale and application of the liquid in a carbon supplement process. The liquid for regenerating waste activated carbon can supplement the skeleton carbon of waste activated carbon, enhance the mechanical strength, increase the number of micropores and surface functional groups, and improve the quality of activated carbon.

[0005] To solve the above technical problems, the technical solution adopted by the present application is as follows:

[0006] A liquid for regenerating waste activated carbon produced on a large scale, comprising the following components in volume percentage: 0.1%-15% of a three-dimensional linking agent, 2%-70% of a carbon source, 1%-25% of an activating agent, and 1%-60% of a solvent.

[0007] Preferably, the three-dimensional linking agent is one or more of activated carbon fibers, carbon nanotubes or derivatives thereof; the carbon source is one or more of tar, turpentine, lubricating oil, petroleum ether and paraffin; the activating agent is one or more of potassium hydroxide, potassium carbonate, ethylenediaminetetraacetic acid, ferrous hydroxide and ammonium hydroxide; and the solvent is one or more of diesel, water, benzene, ethanol, diethyl ether, chloroform and acetone.

[0008] The application further provides application of the waste activated carbon regeneration liquid in a waste activated carbon carbon supplement process.

[0009] The application further provides a waste activated carbon carbon supplement process, comprising the following steps:

[0010] S1, mixing the waste activated carbon regeneration liquid with waste activated carbon to obtain a mixture;

[0011] S2, transferring the mixture obtained in S1 into a closed container to react, to obtain a reaction product;

[0012] S3, cleaning the reaction product obtained in S2 with deionized water for 2-10 times, removing impurities with a nitric acid solution with a volume fraction of 10-55%, and air drying to obtain solid activated carbon;

[0013] S4, passing nitrogen containing water vapor and / or CO2 into the solid activated carbon obtained in step S3 to activate, and cooling to room temperature in a nitrogen atmosphere after the activation is completed, to obtain regenerated activated carbon.

[0014] Preferably, in step S1, the volume percentage of the waste activated carbon regeneration liquid is 10-50%, and the volume percentage of the waste activated carbon is 50%-90%.

[0015] Preferably, in step S2, the mixture obtained in S1 is transferred into a closed container to react, wherein the volume of the mixture is 15%-75% of the volume of the closed container.

[0016] Preferably, in step S2, the reaction temperature is 100-350℃, and the reaction time is 10-48h.

[0017] Preferably, in step S3, the air drying temperature is 80-150℃, and the air drying time is 12-48h.

[0018] Preferably, in step S3, the activation temperature is 600-1000℃, and the activation time is 1-10h.

[0019] Compared with the prior art, the application has the following advantages and technical effects:

[0020] The application provides a waste activated carbon regeneration liquid suitable for large-scale production and a carbon supplement process thereof, and has significant technical effects and advantages. The regeneration liquid is mainly composed of waste such as tar, turpentine, lubricating oil, petroleum ether and paraffin, realizes recycling of resources, reduces production cost, and meets the concept of green environmental protection and sustainable development. Through the carbon supplement process, the skeleton carbon of the waste activated carbon can be effectively supplemented, the mechanical strength of the regenerated activated carbon is significantly enhanced, the regenerated activated carbon is not easy to break in the use process, the service life is prolonged, and the economic benefit is improved. At the same time, the process can also increase the number of micropores and surface functional groups of the regenerated activated carbon, significantly improve the adsorption performance of the regenerated activated carbon, and make the application effect of the regenerated activated carbon in the fields of gas purification, water treatment, food decolorization and odor removal more excellent. The regenerated activated carbon has higher specific surface area and pore volume, and the adsorption capacity is significantly improved, so that the original performance of the waste activated carbon can be effectively restored or even exceeded, and various high-standard application requirements can be met.

[0021] The technical solutions of the application are further described below through examples. DETAILED DESCRIPTION

[0022] The technical solutions of the application are further described below through examples.

[0023] Unless otherwise defined, the technical terms or scientific terms used in the application should be understood as the usual meanings understood by those skilled in the art to which the application belongs.

[0024] In the application, unless otherwise specified, other test materials and instruments and equipment are conventional test materials in the art, which can be purchased through commercial channels.

[0025] Example 1 The present embodiment provides a waste activated carbon regeneration liquid, which comprises the following components in volume percentage: 11% activated carbon fiber, 41% tar, 8% potassium hydroxide and 40% benzene. The above components are mixed thoroughly to ensure that the waste activated carbon regeneration liquid has a certain fluidity.

[0026] Example 2 The present embodiment provides a waste activated carbon regeneration liquid, which comprises the following components in volume percentage: 14% activated carbon fiber, 11% tar, 27% turpentine, 4% potassium hydroxide, 4% ferrous hydroxide and 40% diethyl ether. The above components are mixed thoroughly to ensure that the waste activated carbon regeneration liquid has a certain fluidity.

[0027] Example 3 The present embodiment provides a waste activated carbon carbon supplement process, which comprises the following steps:

[0028] S1, the waste activated carbon regeneration liquid provided in example 1 is mixed with the waste activated carbon after desorption etching, wherein the volume percentage of the waste activated carbon regeneration liquid is 37%, and the volume percentage of the waste activated carbon is 63%, to obtain a mixture;

[0029] S2, transferring the mixture obtained in S1 into a closed container to react at 180°C for 18h, wherein the volume of the mixture is 50% of the volume of the closed container, to obtain a reactant;

[0030] S3, cleaning the reactant obtained in S2 with deionized water for 5 times, removing impurities with a nitric acid solution with a volume fraction of 15%, and drying at 105°C for 12h with a blast, to obtain solid activated carbon;

[0031] S4, passing nitrogen containing 10% water vapor into the solid activated carbon obtained in step S3, and activating at 950°C for 4h, and cooling to room temperature in a nitrogen atmosphere after the activation is completed, to obtain regenerated activated carbon.

[0032] Example 4 This example provides a waste activated carbon carbon supplement process, comprising the following steps:

[0033] S1, mixing the waste activated carbon regeneration liquid provided in Example 2 with the waste activated carbon after desorption etching, wherein the volume percentage of the waste activated carbon regeneration liquid is 44%, and the volume percentage of the waste activated carbon is 56%, to obtain a mixture;

[0034] S2, transferring the mixture obtained in S1 into a closed container to react at 200°C for 24h, wherein the volume of the mixture is 50% of the volume of the closed container, to obtain a reactant;

[0035] S3, cleaning the reactant obtained in S2 with deionized water for 5 times, removing impurities with a nitric acid solution with a volume fraction of 20%, and drying at 115°C for 24h with a blast, to obtain solid activated carbon;

[0036] S4, passing nitrogen containing 10% water vapor into the solid activated carbon obtained in step S3, and activating at 750°C for 3h, and cooling to room temperature in a nitrogen atmosphere after the activation is completed, to obtain regenerated activated carbon.

[0037] The regenerated activated carbon obtained in Example 3 and Example 4 is subjected to performance testing, and the results are shown in Table 1.

[0038] Table 1 Performance test results of regenerated activated carbon

[0039]

[0040]

[0041] The ethyl acetate adsorption capacity is determined at an ethyl acetate vaporization temperature of 90°C.

[0042] It should be pointed out finally that the above examples are only used to illustrate the technical solutions of the present application but not to limit it, and although the present application has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the technical solutions of the present application can still be modified or replaced equivalently, and these modifications or equivalent replacements should not make the modified technical solutions deviate from the spirit and scope of the technical solutions of the present application.

Claims

1. A waste activated carbon regeneration solution for large-scale production, characterized in that, It includes the following components by volume percentage: 11%-14% three-dimensional binder, 38%-41% carbon source, 8% activator, and 40% solvent; The three-dimensional binder is one or more of activated carbon fiber, carbon nanotubes, or their derivatives; the carbon source is one or more of tar, turpentine, lubricating oil, petroleum ether, and paraffin; the activator is one or more of potassium hydroxide, potassium carbonate, ethylenediaminetetraacetic acid, ferrous hydroxide, and ammonium hydroxide; and the solvent is one or more of diesel oil, water, benzene, ethanol, diethyl ether, chloroform, and acetone. The application of the waste activated carbon regeneration solution in the waste activated carbon replenishment process; A process for replenishing spent activated carbon includes the following steps: S1. Mix the waste activated carbon regeneration liquid with waste activated carbon to obtain a mixture; S2. Transfer the mixture obtained in S1 to a closed container for reaction to obtain the reactants; S3. Wash the reactants obtained in S2 with deionized water 2-10 times, remove impurities with nitric acid solution with a volume fraction of 10-55%, and dry with forced air to obtain solid activated carbon. S4. Nitrogen gas containing water vapor and / or CO2 is introduced into the solid activated carbon obtained in step S3 for activation. After activation, the activated carbon is cooled to room temperature in a nitrogen atmosphere to obtain regenerated activated carbon. In step S1, the volume percentage of the waste activated carbon regeneration liquid is 10-50%, and the volume percentage of the waste activated carbon is 50%-90%. In step S2, the mixture obtained in S1 is transferred to a sealed container for reaction, wherein the volume of the mixture is 15%-75% of the volume of the sealed container.

2. The waste activated carbon regeneration solution for large-scale production according to claim 1, characterized in that, In step S2, the reaction temperature is 100-350℃ and the reaction time is 10-48h.

3. The waste activated carbon regeneration solution for large-scale production according to claim 1, characterized in that, In step S3, the temperature of the blower drying is 80-150℃, and the time of the blower drying is 12-48h.

4. The waste activated carbon regeneration solution for large-scale production according to claim 1, characterized in that, In step S3, the activation temperature is 600-1000℃, and the activation time is 1-10h.

Images