Method for testing saturation degree of activated carbon adsorption

Abstract

The application discloses a kind of active carbon adsorption saturation degree test methods, comprising the following steps: according to the dry base volatile content of test active carbon sample, determine the conversion coefficient K of this kind of active carbon;Conversion coefficient K is between 20-30 certain fixed value;According to conversion coefficient K and the dry base volatile content of field active carbon sample, the reduction amount of field active carbon sample iodine adsorption value is calculated;According to the reduction amount of field active carbon sample iodine adsorption value and the iodine adsorption value of new carbon, the current iodine adsorption value of field active carbon sample is calculated, which corresponds to the adsorption saturation degree of field active carbon sample.The active carbon adsorption saturation degree test method of the application utilizes the characteristics that volatile components increase after active carbon adsorbs organic matter, by testing the volatile component content in active carbon, and by specific calculation, the current iodine adsorption value of active carbon is obtained, which simplifies the analysis steps, reduces the difficulty of field analysis, improves the detection efficiency and popularization degree.

Description

[0001] This application is a divisional application of the invention patent application filed on June 30, 2023, with application number 2023107865035 and invention title "A method for testing the adsorption saturation of activated carbon". Technical Field

[0002] This invention belongs to the field of activated carbon analysis and detection technology, specifically relating to a method for testing the adsorption saturation degree of activated carbon. Background Technology

[0003] The production process of industries such as coating and textiles generates a large amount of organic waste gas. After being collected by a fan, the gas needs to be adsorbed by activated carbon and meet the corresponding standards before it can be discharged into the air. The adsorption performance of this activated carbon needs to be monitored during use. Activated carbon with poor adsorption performance needs to be replaced or regenerated.

[0004] In existing technologies, testing the adsorption capacity of activated carbon requires professionals to test the iodine adsorption value of the activated carbon in a laboratory using national standard testing methods, thereby obtaining its corresponding adsorption saturation level. However, this method not only fails to achieve rapid response but also requires highly specialized expertise from the testing personnel, and the testing process is cumbersome.

[0005] To address this issue, a Chinese invention patent application with application number 202210965997.9, entitled "A Method and System for Detecting Adsorption Saturation of Adsorption Materials," discloses a method for detecting the adsorption saturation of activated carbon. This method calculates the adsorption saturation of the material by testing the concentration difference between the inlet and outlet of the waste gas entering the material. However, this method has drawbacks: it requires a specific device and a precision measuring instrument to measure the concentration of the waste gas at the inlet and outlet of the device in real time, resulting in high costs. It also imposes certain limitations on the arrangement and morphology of the material and requires a high level of expertise from operators. Summary of the Invention

[0006] In view of this, in order to overcome the shortcomings of the prior art, the purpose of this invention is to provide an improved method for testing the adsorption saturation of activated carbon, which has better applicability.

[0007] To achieve the above objectives, the present invention adopts the following technical solution:

[0008] A method for testing the adsorption saturation degree of activated carbon includes the following steps:

[0009] 1) Determine the conversion factor K for activated carbon.

[0010] The moisture content in the dried activated carbon sample was tested, and the moisture value A1 was obtained.

[0011] The volatile components in the activated carbon sample were desorbed and tested to obtain a combined value B1 of volatile components and moisture.

[0012] Based on the moisture content A1 and the combined content B1, the dry basis volatile matter content C1 of the tested activated carbon sample is calculated using the following formula:

[0013] C1=100%-(1-B 1) / (1-A1)×100%;

[0014] The conversion factor K of this type of activated carbon is determined based on the dry basis volatile matter content C1;

[0015] 2) Determine the iodine adsorption value of the activated carbon sample at the site.

[0016] The moisture content of the activated carbon sample was dried on-site to obtain the moisture value A2.

[0017] The volatile components in the activated carbon sample were desorbed at the site, and the combined value of volatile components and moisture was obtained as B2.

[0018] Based on the moisture content A2 and the comprehensive value B2, the dry basis volatile matter content C2 of the activated carbon sample was calculated using the following formula:

[0019] C2=100%-(1-B2) / (1-A2)×100%;

[0020] Based on the conversion factor K obtained in step 1 and the dry basis volatile content C2 of the activated carbon sample, the reduction in iodine adsorption value of the activated carbon sample was calculated.

[0021] Based on the decrease in iodine adsorption value of the activated carbon sample at the site and the iodine adsorption value of the new activated carbon, the current iodine adsorption value of the activated carbon sample at the site is calculated, which corresponds to the adsorption saturation degree of the activated carbon sample at the site. The new activated carbon is activated carbon that has never been used.

[0022] According to some preferred embodiments of the present invention, the test activated carbon sample and the field activated carbon sample are activated carbon under the same usage scenario, that is, the parameters of the test activated carbon sample and the field activated carbon sample are consistent when they are used.

[0023] According to some preferred embodiments of the present invention, the conversion factor K is calculated by the following method: iodine value tests are performed on the activated carbon sample and new activated carbon, and the conversion factor K is calculated according to the following formula:

[0024] K = (I 新炭- I 测试活性炭 ) / (C1×100);

[0025] In the formula, I 新炭 I represents the iodine adsorption value of the new charcoal. 测试活性炭To test the iodine adsorption value of activated carbon samples.

[0026] According to some preferred embodiments of the present invention, the reduction in iodine adsorption value of the on-site activated carbon sample is I 降低 Calculate using the following formula:

[0027] I 降低 =K×C2×100.

[0028] According to some preferred embodiments of the present invention, the moisture values ​​A1 and A2 are calculated according to the following formula:

[0029] A1 or A2 = (M 原始- M 烘干 ) / M 原始 ×100%;

[0030] In the formula, M 原始 M represents the original mass of activated carbon. 烘干 This represents the mass of the activated carbon after drying. When calculating A1, the corresponding activated carbon is the test activated carbon sample; when calculating A2, the corresponding activated carbon is the on-site activated carbon sample.

[0031] According to some preferred embodiments of the present invention, the combined values ​​B1 and B2 are calculated according to the following formula:

[0032] B1 or B2 = (M 原始- M 脱附 ) / M 原始 ×100%;

[0033] In the formula, M 脱附 This represents the mass of the activated carbon after desorption. When calculating B1, the corresponding activated carbon is the test activated carbon sample; when calculating B2, the corresponding activated carbon is the on-site activated carbon sample.

[0034] According to some preferred embodiments of the present invention, the drying conditions are drying at 100-150°C for 120-180 min.

[0035] According to some preferred embodiments of the present invention, the conditions for drying the moisture content of the test activated carbon sample and the on-site activated carbon sample are the same.

[0036] According to some preferred embodiments of the present invention, the desorption condition is to maintain the temperature at 650-800°C for 10-30 minutes. 650-800°C is the activation and desorption temperature range for activated carbon; if the temperature is too low, the desorption effect is poor, and if the temperature is too high, the carbon will be oxidized.

[0037] According to some preferred embodiments of the present invention, the conditions for desorption of volatile components from the test activated carbon sample and the on-site activated carbon sample are the same.

[0038] Compared with the prior art, the advantages of the present invention are as follows: The method for testing the adsorption saturation of activated carbon in the present invention utilizes the characteristic that the volatile components increase after activated carbon adsorbs organic matter. By testing the content of volatile components in activated carbon and through specific calculations, the current iodine adsorption value of activated carbon is obtained, which simplifies the analysis steps, reduces the difficulty of on-site analysis, and improves the detection efficiency and accessibility. Detailed Implementation

[0039] To enable those skilled in the art to better understand the technical solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0040] Currently, monitoring the performance of activated carbon primarily relies on specialized analytical methods employed by professional testing institutions. These methods involve acidification, redox titration, and other analytical procedures, which are cumbersome, require a high level of expertise, and necessitate the use of hazardous chemicals. This makes on-site monitoring difficult for conventional enterprises. Therefore, there is currently no readily available and convenient method for users to quickly and easily assess the performance of activated carbon. This invention utilizes thermogravimetric analysis to test the content of relevant components in activated carbon. By observing the weight changes under different temperature conditions, the change in iodine adsorption value is derived. This simplifies the analytical method, reduces the analytical difficulty, and allows on-site personnel to quickly and easily determine changes in the adsorption performance of activated carbon, achieving the goal of rapid and convenient monitoring of activated carbon quality.

[0041] The method for testing the degree of activated carbon adsorption saturation in this embodiment includes the following steps:

[0042] Step 1: Determine the conversion factor K for activated carbon.

[0043] The activated carbon sample was dried in a high-temperature oven at 100-150℃ for 120-180 minutes to obtain the moisture value A1.

[0044] A1=(M 原始- M 烘干 ) / M 原始 ×100%;

[0045] In the formula, M 原始 To test the original mass of the activated carbon sample, i.e., the mass before drying, M 烘干 To test the quality of the activated carbon sample after drying.

[0046] The volatile components in the activated carbon sample were rapidly desorbed and tested using a muffle furnace at 650-800℃ for 10-30 min. The combined value of volatile components and moisture was obtained as B1.

[0047] B1 = (M 原始- M 脱附 ) / M 原始 ×100%;

[0048] In the formula, M 脱附 To test the quality of the activated carbon sample after desorption, M 原始 To test the original mass of the activated carbon sample, i.e., the mass before desorption.

[0049] Moisture content A1 and composite content B1 represent the percentage of activated carbon weight loss relative to the total weight of the activated carbon sample.

[0050] Based on the moisture content A1 and the combined content B1, the dry basis volatile matter content C1 of the tested activated carbon sample is calculated using the following formula:

[0051] C1=100%-(1-B 1) / (1-A1)×100%;

[0052] The conversion factor K of this type of activated carbon is determined based on the dry basis volatile matter content C1. It is calculated as follows: Iodine value tests are performed on the activated carbon sample and new carbon, and the conversion factor K between iodine value and volatile matter is calculated. The formula for calculating the conversion factor K is as follows:

[0053] K = (I 新炭- I 测试活性炭 ) / (C1×100);

[0054] In the formula, I 新炭 I represents the iodine adsorption value of the new charcoal. 测试活性炭 To test the iodine adsorption value of activated carbon samples. Fresh activated carbon refers to activated carbon that has never been used.

[0055] The iodine adsorption value was tested according to the procedures outlined in GB / T 7702.7-2008 "Test Methods for Iodine Adsorption Value of Coal-based Granular Activated Carbon". Based on experience, the conversion factor K is typically calculated to be a fixed value between 20 and 30.

[0056] Step 2: Determine the iodine adsorption value of the activated carbon sample at the site.

[0057] The moisture content of the activated carbon sample was dried on-site to obtain the moisture value A2.

[0058] The tested activated carbon samples and the on-site activated carbon samples were activated carbon from the same usage scenario.

[0059] The volatile components in the activated carbon sample were desorbed, and the combined value B2 of the volatile components and moisture was obtained. The calculation formulas for the moisture value A2 and the combined value B2 are similar to those for A1 and B2, respectively.

[0060] Based on the moisture content A2 and the comprehensive value B2, the dry basis volatile matter content C2 of the activated carbon sample was calculated using the following formula:

[0061] C2=100%-(1-B2) / (1-A2)×100%;

[0062] Based on the conversion factor K obtained in step one and the dry basis volatile matter content C2 of the activated carbon sample, the reduction in iodine adsorption value I of the activated carbon sample was obtained. 降低 .

[0063] The decrease in iodine adsorption value of activated carbon samples on site 降低 Calculate using the following formula:

[0064] I 降低 =K×C2×100.

[0065] Based on the decrease in iodine adsorption value of the activated carbon samples at the site, I 降低 Iodine adsorption value of new charcoal 新炭 The current iodine adsorption value of the activated carbon sample on site is obtained, which corresponds to the adsorption saturation degree of the activated carbon sample on site.

[0066] Step one above, determining the conversion factor K of activated carbon, is a preparatory step. The conversion factor K can be obtained after the new carbon has been used for a period of time. Then, when testing the adsorption saturation of activated carbon, the previously obtained conversion factor K can be used directly without repeating the measurement.

[0067] Example 1

[0068] A textile coating factory currently has columnar activated carbon with a new iodine adsorption value of 903 mg / g. After a period of use, its adsorption performance needs to be tested. The following steps are used for rapid testing:

[0069] 1) Determine the conversion factor K for activated carbon.

[0070] 1.1) The moisture content of the activated carbon sample was dried by drying it in a high-temperature oven at 150°C for 120 min, and the moisture content A1 was 19.7%.

[0071] 1.2) The volatile components in the activated carbon sample were rapidly desorbed and tested using a muffle furnace at 700℃ for 20 min. The combined value of volatile components and moisture, B1, was 28.2%.

[0072] 1.3) The dry basis volatile matter content C1 of the tested activated carbon sample was calculated to be 10.59% according to the following formula:

[0073] C1=100%-(1-B 1) / (1-A1)×100%;

[0074] 1.4) The iodine value of the activated carbon sample was tested. The iodine adsorption value of the activated carbon sample after on-site use was measured to be 641 mg / g. The conversion factor K between iodine value and volatile matter was calculated. The formula for calculating the conversion factor K is as follows:

[0075] K = (I 新炭- I 测试活性炭 ) / (C1×100);

[0076] In the formula, I 新炭 I represents the iodine adsorption value of the new charcoal. 测试活性炭 To test the iodine adsorption value of activated carbon samples.

[0077] In this embodiment, the conversion factor K is calculated to be 24.7.

[0078] 2) Determine the iodine adsorption value of the activated carbon samples in the field.

[0079] 2.1) The moisture content of the activated carbon sample was dried on-site, and the moisture content A2 was found to be 19.5%.

[0080] The tested activated carbon samples and the on-site activated carbon samples were activated carbon from the same usage scenario.

[0081] 2.2) The volatile components in the activated carbon sample were desorbed on-site, and the combined value of volatile components and moisture, B2, was 27.7%.

[0082] 2.3) The dry basis volatile matter content C2 of the activated carbon sample was calculated to be 10.19%.

[0083] 2.4) Based on the decrease in iodine adsorption value I of the activated carbon samples on site 降低 The reduction in iodine adsorption value I of the on-site activated carbon sample is calculated by multiplying the conversion factor K by the dry basis volatile content C2 × 100. 降低 It is 251.7 mg / g.

[0084] 2.5) Based on the decrease in iodine adsorption value of the activated carbon samples on site, I 降低 Iodine adsorption value of new charcoal 新炭 The current iodine adsorption value of the activated carbon sample obtained was 651.3 mg / g, which corresponds to the adsorption saturation degree of the activated carbon sample.

[0085] Meanwhile, the same sample was sent to a third-party testing agency, which revealed that the iodine adsorption value of the activated carbon sample was 650 mg / g, and the iodine value reduction was 250 mg / g. Compared with the data obtained from the third-party testing agency, the standard measurement deviation using the rapid testing method described in Example 1 was only 0.7%, indicating good applicability.

[0086] Standard measurement deviation = (rapid test value - third-party test value) / rapid test value * 100%.

[0087] The method for testing the adsorption saturation of activated carbon in this application utilizes the characteristic that the volatile components increase after activated carbon adsorbs organic matter. By testing the content of volatile components in the activated carbon and calculating the iodine adsorption value through empirical conversion, the analytical steps are simplified, the difficulty of on-site analysis is reduced, and the method is made more widely applicable. Furthermore, this method is applicable to activated carbon used for adsorbing organic waste gases or other non-viscous materials, thus having a broad range of applications.

[0088] The above embodiments are only for illustrating the technical concept and features of the present invention. Their purpose is to enable those skilled in the art to understand the content of the present invention and implement it accordingly. They should not be used to limit the scope of protection of the present invention. All equivalent changes or modifications made in accordance with the spirit and essence of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A method for testing the adsorption saturation degree of activated carbon, characterized in that, Includes the following steps: The conversion factor K is determined based on the dry basis volatile matter content of the activated carbon sample; the conversion factor K is a fixed value between 20 and 30. The reduction in iodine adsorption value of the activated carbon sample was calculated based on the conversion factor K and the dry basis volatile content of the activated carbon sample. Based on the decrease in iodine adsorption value of the activated carbon sample and the iodine adsorption value of the new carbon, the current iodine adsorption value of the activated carbon sample is calculated, which corresponds to the adsorption saturation degree of the activated carbon sample. The conversion factor K is calculated as follows: Iodine value tests are performed on the activated carbon sample and new activated carbon, and the conversion factor K is calculated according to the following formula: K=(I 新炭- I 测试活性炭 ) / (C1×100); In the formula, I 新炭 I represents the iodine adsorption value of the new charcoal. 测试活性炭 The iodine adsorption value of the activated carbon sample was used to test the activated carbon sample; C1 represents the dry basis volatile content of the activated carbon sample. The reduction in iodine adsorption value of the activated carbon sample at the site I 降低 Calculate using the following formula: I 降低 =K×C2×100; In the formula, C2 is the dry basis volatile content of the activated carbon sample; The dry basis volatile matter content C1 of the tested activated carbon sample was obtained through the following steps: The moisture content in the dried activated carbon sample was tested, and the moisture value A1 was obtained. The volatile components in the activated carbon sample were desorbed and tested to obtain a combined value B1 of volatile components and moisture. Based on the moisture content A1 and the combined content B1, the dry basis volatile matter content C1 of the tested activated carbon sample is calculated using the following formula: C1=100%-(1-B1) / (1-A1)×100%; The dry basis volatile matter content C2 of the on-site activated carbon sample was obtained through the following steps: The moisture content of the activated carbon sample was dried on-site to obtain the moisture value A2. The volatile components in the activated carbon sample were desorbed at the site, and the combined value of volatile components and moisture was obtained as B2. Based on the moisture content A2 and the comprehensive value B2, the dry basis volatile matter content C2 of the activated carbon sample was calculated according to the following formula; C2=100%-(1-B2) / (1-A2)×100%; The drying conditions are drying at 100-150℃ for 120-180 min; the desorption conditions are holding at 650-800℃ for 10-30 min. The conditions for drying the moisture in the test activated carbon samples and the on-site activated carbon samples were the same; the conditions for desorbing volatile components in the test activated carbon samples and the on-site activated carbon samples were the same.

2. The test method according to claim 1, characterized in that, The iodine adsorption value was tested according to the steps in GB / T7702.7-2008 "Test Methods for Iodine Adsorption Value of Coal-based Granular Activated Carbon".

3. The test method according to claim 1, characterized in that, The new carbon is activated carbon that has never been used before.

4. The test method according to claim 1, characterized in that, The activated carbon samples tested and the activated carbon samples used in the field were activated carbon from the same application scenario, and all parameters were kept consistent during use.

5. The test method according to claim 1, characterized in that, The moisture content A1 of the tested activated carbon sample is calculated according to the following formula: A1=(M 原始- M 烘干 ) / M 原始 ×100%; In the formula, M 原始 To test the original mass of the activated carbon sample, M 烘干 To test the quality of the activated carbon sample after drying.

6. The test method according to claim 1, characterized in that, The comprehensive value B1 of the tested activated carbon sample is calculated according to the following formula: B1=(M 原始- M 脱附 ) / M 原始 ×100%; In the formula, M 脱附 To test the quality of the activated carbon sample after desorption, M 原始 To test the original quality of the activated carbon sample.

7. The test method according to claim 1, characterized in that, The moisture content A2 of the activated carbon sample from the site is calculated using the following formula: A2=(M 原始- M 烘干 ) / M 原始 ×100%; In the formula, M 原始 For the original mass of the activated carbon sample from the site, M 烘干 This refers to the mass of the activated carbon sample after drying.

8. The test method according to claim 1, characterized in that, The comprehensive value B2 of the on-site activated carbon sample is calculated according to the following formula: B2=(M 原始- M 脱附 ) / M 原始 ×100%; In the formula, M 脱附 M represents the mass of the activated carbon sample after desorption at the site. 原始 This refers to the original mass of the activated carbon sample from the site.