Method for measuring intensity of ion exchange resin through laser particle size method

Abstract

The invention belongs to the technical field of ion exchange resin detection, and particularly discloses a method for measuring the intensity of ion exchange resin through a laser particle size method. The particle size distribution of the ion exchange resin before and after the simulation adverse factors are applied is counted through a laser particle analyzer, a distribution curve of the particle size of the resin is fitted, then a distribution curve of the volume of the resin before and after the simulation adverse factors are applied is calculated, and the volume of the resin is calculated according to the change of the front and rear curves. Quantitative measurement of the strength of the ion exchange resin is achieved, and the determination method is efficient and good in reproducibility and can be used for quality control of the ion exchange resin.

Description

Technical Field

[0001] This invention belongs to the field of ion exchange resin detection technology, specifically relating to a method for measuring the strength of ion exchange resins using laser particle size distribution. Background Technology

[0002] Ion exchange resins remove ions from solution by exchanging exchangeable ions on their polymer backbone with ions in the solution. Ion exchange resin particles are mostly spherical. However, in actual use, ion exchange resin particles are subjected to external forces such as water flow impact, stress from acid and alkali solution immersion, and friction and compression between particles or between particles and the container. This causes the originally spherical resin particles to break into non-spherical particles or even powder. These broken ion exchange resin particles flow out of the resin bed with the water flow, affecting not only the exchange capacity and effluent quality of the water treatment device, but also migrating throughout the system, causing pipeline blockages, and potentially leading to equipment accidents or pollution. Therefore, assessing the strength of ion exchange resin particles is a crucial part of ion exchange resin performance evaluation. Current methods for assessing resin strength often involve manually separating the non-spherical and spherical portions of the resin under simulated operating conditions, then weighing and calculating the results separately. This method suffers from drawbacks such as low efficiency, poor repeatability, and significant susceptibility to the influence of the experimenter's experience and subjective judgment. Summary of the Invention

[0003] The purpose of this invention is to provide a method for measuring the strength of ion exchange resins using laser particle size distribution, in order to solve the problems of low efficiency, poor repeatability, and significant influence of the experimenter's experience and subjective judgment on the results of current identification methods.

[0004] To achieve the above objectives, the present invention adopts the following technical solution: A method for measuring the strength of ion exchange resins using laser particle size distribution includes: The ion exchange resin sample is shaped to ensure it is in a defined and stable state. Weigh a set amount of the ion exchange resin sample after shaping, put it into a laser particle size analyzer, and obtain the particle size distribution of the ion exchange resin particles. By fitting the particle size distribution of ion exchange resin particles, the particle size distribution curve is obtained, and the volume distribution curve of the particles before the application of adverse factors is calculated. Based on the resin's usage environment, various adverse factors are simulated to be applied to the resin. The resin that has been subjected to various adverse factors is placed into a laser particle size analyzer to obtain the particle size distribution of the ion exchange resin particles. By fitting the particle size distribution curve of the ion exchange resin particles, the volume distribution curve of the particles after applying adverse factors is calculated. By analyzing the volume distribution curves of resin particles before and after applying adverse factors, the breakage rate of resin particles can be calculated, thereby reflecting the strength of the resin.

[0005] A further improvement of the present invention is that the fragmentation rate is the percentage of the volume of non-spherical particles of the ion exchange resin to the total volume.

[0006] A further improvement of this invention is that the particle size distribution curve of the resin particles is presented in the form of a normal distribution or a superposition of multiple normal distributions, that is:

[0007] in: x The particle size of the ion exchange resin particles. y For probability density, y 0、 w , x c These are parameters that describe the location and shape of a normal distribution.

[0008] A further improvement of this invention is that the volume distribution curve of the resin particles is calculated from the particle size distribution curve, that is:

[0009] in: x The particle size of the ion exchange resin particles. y For probability density, y 0、 w , x c These are parameters that describe the location and shape of a normal distribution.

[0010] A further improvement of the present invention is that, after the application of adverse factors, some resin particles break into smaller particles. Therefore, compared with before the application of adverse factors, a new peak will appear in the particle size distribution curve in the smaller particle size range. By integrating the volume distribution curve of the volume range corresponding to this particle size range and dividing it by the integral value of the volume distribution curve after the application of adverse factors, the volume ratio of broken particles, i.e., the breakage rate, can be obtained.

[0011] A further improvement of this invention is that by comparing the ball breakage rates of different resins subjected to the same adverse factors, the strength of the resin can be accurately reflected.

[0012] A further improvement of this invention is that it simulates adverse factors including: the impact force of water flow on ion exchange resin particles, the stress generated by soaking in acid and alkali solutions, and the friction and extrusion forces between particles or between particles and the container; due to the different strengths of different types and brands of resin particles, different proportions of resin particles break, changing from spherical particles to broken particles.

[0013] A further improvement of this invention is that the simulated adverse factors of water flow impact and acid / alkali solution immersion are achieved by adding acid / alkali solution to the resin located in the exchange column.

[0014] A further improvement of this invention is that the simulated adverse factors of friction and extrusion are achieved by ball milling the resin particles using a ball mill.

[0015] Compared with the prior art, the present invention has at least the following beneficial technical effects: This invention provides a method for measuring the strength of ion exchange resins using laser particle size analysis. Using a laser particle size analyzer, the volume-probability density curves of the ion exchange resin before and after applying adverse factors are fitted using particle size distribution data. The change in breakage rate is calculated by analyzing the peak area of ​​the curves. This method enables accurate and rapid evaluation of resin strength performance under different application scenarios, solving the problem of lacking a method for evaluating the strength of ion exchange resins in actual use environments. This method is efficient, low-cost, and has good reproducibility, making it suitable for quality control of ion exchange resins. Attached Figure Description

[0016] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0017] Figure 1 This is a particle size distribution diagram of the resin particles after shaping in Example 1; Figure 2 This is the particle size distribution curve of the resin particles after shaping in Example 1; Figure 3 This is a particle size distribution diagram of the resin particles after applying adverse factors in Example 1; Figure 4 This is the particle size distribution curve of the resin particles after applying adverse factors in Example 1; Figure 5 This is a comparison of the particle size distribution curves of the resin particles before and after the application of adverse factors in Example 1. Figure 6 This is a particle size distribution diagram of the resin particles after shaping in Example 2; Figure 7 This is the particle size distribution curve of the resin particles after shaping in Example 2; Figure 8 This is a particle size distribution diagram of the resin particles after applying adverse factors in Example 2; Figure 9This is the particle size distribution curve of the resin particles after applying adverse factors in Example 2; Figure 10 This is a comparison of the particle size distribution curves of the resin particles before and after the application of adverse factors in Example 2. Detailed Implementation

[0018] In the following description, only certain exemplary embodiments are briefly described. As those skilled in the art will recognize, the described embodiments can be modified in various ways without departing from the spirit or scope of the invention. Therefore, the drawings and description are considered to be exemplary in nature and not restrictive.

[0019] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0020] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0021] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a communication connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0022] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0023] It should be understood that, when used in this specification and the appended claims, the terms "comprising" and "including" indicate the presence of the described features, integrals, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components and / or collections thereof.

[0024] It should also be understood that the terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the invention. As used in this specification and the appended claims, the singular forms “a,” “an,” and “the” are intended to include the plural forms unless the context clearly indicates otherwise.

[0025] It should also be further understood that the term "and / or" as used in this specification and the appended claims refers to any combination of one or more of the associated listed items and all possible combinations, and includes such combinations.

[0026] The accompanying drawings illustrate various structural schematic diagrams according to embodiments disclosed in this invention. These drawings are not to scale, and some details have been enlarged for clarity, and some details may have been omitted. The shapes of the various regions and layers shown in the drawings, as well as their relative sizes and positional relationships, are merely exemplary and may deviate from reality due to manufacturing tolerances or technical limitations. Furthermore, those skilled in the art can design regions / layers with different shapes, sizes, and relative positions as needed.

[0027] The embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0028] The breakage rate is the proportion of the total volume of non-spherical resin particles to the total volume of all resin particles. When the resin has high strength, its breakage rate is relatively low after experiencing adverse factors such as water flow impact, stress impact from acid / alkali solution immersion, friction between particles or between particles and the container, and compression. Conversely, for resins with lower strength, the breakage rate is higher after experiencing adverse factors. The greater the increase in breakage rate after applying adverse factors, the lower the resin strength. Therefore, the strength of the resin can be determined by measuring the breakage rate of resin particles after applying adverse factors.

[0029] Based on in-depth research on the physicochemical properties of ion exchange resins, this invention establishes a simple and feasible rapid method for determining resin strength, which has significant practical and economic value.

[0030] Example 1 This invention provides a method for measuring the strength of ion exchange resins using laser particle size distribution, comprising: S1: Shape the resin sample to be tested. Specifically, 20 mL of 001×7 type cation exchange resin is measured using a graduated cylinder and placed in the exchange column. Hydrochloric acid solution is then added to the exchange column to ensure that all the 001×7 type anion exchange resin is in the chloride form. At this point, the resin sample morphology is determined and stable, ensuring that the particle size of each resin particle does not change during the detection process.

[0031] S2: Measurement of the original resin sample Weigh 5.00g of the shaped resin and add it to a laser particle size analyzer. The particle size distribution of the ion exchange resin is then measured by the laser particle size analyzer.

[0032]

[0033] Based on the particle size distribution of the sample, draw a particle size distribution histogram. Figure 1 ), and fit the particle size distribution curve:

[0034] Particle size distribution curve as shown Figure 2 As shown.

[0035] Based on the fitted particle size distribution curve, the volume distribution curve of the resin particles is calculated:

[0036] S3: Apply adverse factors to the resin sample simulation.

[0037] After D301 type ion exchange resin fails to regenerate, it is usually regenerated using hydrochloric acid. However, upon contact with sodium hydrochloric acid, the stress generated by the chemical reaction can cause some resin particles to break. Therefore, hydrochloric acid solution was used to rinse the resin sample to simulate the adverse factors during the resin regeneration process in daily use. Simultaneously, as the resin particles are transported in the container with the water flow, they will rub against each other or collide with the inner walls of the container and pipelines, causing some resin particles to break. Therefore, a ball mill was used to simulate the mechanical forces experienced by the resin during use.

[0038] Specifically, 5.00g of the stabilized resin was weighed and added to the exchange column. A 1M hydrochloric acid solution was added to the column using a peristaltic pump at a flow rate of 10mL / min for 5 minutes to simulate the increased breakage rate of the 001×7 type ion exchange resin under stress during regeneration. After washing away the residual hydrochloric acid on the resin surface with deionized water, the resin was transferred to a stainless steel cylinder, and six ceramic balls were added. The stainless steel cylinder, along with the resin and ceramic balls, was then rotated in a ball mill at 120rpm for 10 minutes. During this process, the ceramic balls rubbed against the resin particles, and there was also friction between the resin particles and the inner wall of the stainless steel cylinder, as well as between the resin particles themselves. This simulated the adverse mechanical forces experienced by the resin particles during transport by water flow within the container. Both of these adverse factors caused some spherical resin particles to break down into smaller particles, increasing the breakage rate of the resin.

[0039] S4: Measure the resin samples of the tree after applying simulated adverse factors; The resin sample after adverse factors were applied was added to a laser particle size analyzer, and the particle size distribution of the ion exchange resin was measured by the laser particle size analyzer.

[0040]

[0041] Based on the particle size distribution of the sample, draw a particle size distribution histogram. Figure 3 ), and fit the particle size distribution curve:

[0042] Particle size distribution curve as shown Figure 4 As shown.

[0043] Based on the fitted particle size distribution curve, the volume distribution curve of the resin particles is calculated:

[0044] like Figure 7As shown in the diagram, comparing the particle size distribution of the resin before and after the application of adverse factors, before the application of adverse factors, there were almost no resin particles distributed in the 0~0.22mm particle size range, while after the application of adverse factors, resin particles showed a clear distribution in the 0~0.22mm range. Therefore, the particles in this particle size range are small particles produced after the original resin particles were broken down due to the adverse factors. The particle volume range corresponding to the 0~0.22mm particle size is 0~0.006mm. 3 Therefore, the volume distribution curve of the resin particles was calculated to be 0~0.006mm. 3 The ratio of the total volume of the particles to the total volume of the resin can be used to calculate the breakage rate of the resin particles after the application of adverse factors.

[0045]

[0046] By calculating the volume distribution curves of resin particles before and after applying simulated adverse factors, it was found that the breakage rate of this 001×7 type ion exchange resin was 14.8% after the adverse factors were applied. The breakage rate of other resins was then measured using the same method, allowing for a comparison of the strength of different resins.

[0047] Example 2 This invention provides a method for measuring the strength of ion exchange resins using laser particle size distribution, comprising: S1: Shape the resin sample to be tested. Specifically, 20 mL of D301 anion exchange resin is measured using a graduated cylinder and placed inside the exchange column. Sodium hydroxide solution is then added to the column to ensure that the D301 anion exchange resin is entirely in the hydroxyl form. At this point, the resin sample morphology is fixed and stable, ensuring that the particle size of each resin particle does not change during the detection process.

[0048] S2: Measurement Sample Weigh 5.00g of the shaped resin and add it to a laser particle size analyzer. The particle size distribution of the ion exchange resin is then measured by the laser particle size analyzer.

[0049]

[0050] Based on the particle size distribution of the sample, draw a particle size distribution histogram. Figure 6 ), and fit the particle size distribution curve:

[0051] Particle size distribution curve as shown Figure 7 As shown.

[0052] Based on the fitted particle size distribution curve, the volume distribution curve of the resin particles is calculated:

[0053] S3: Apply adverse factors to the resin sample simulation.

[0054] After D301 type ion exchange resin fails to regenerate, it is usually regenerated using sodium hydroxide. However, upon contact with sodium hydroxide, the stress generated by the chemical reaction can cause some resin particles to break. Therefore, sodium hydroxide solution was used to rinse the resin sample to simulate the adverse factors during the resin regeneration process in daily use. Simultaneously, as the resin particles are transported in the container with the water flow, they rub against each other or collide with the inner walls of the container and pipelines, causing some resin particles to break. Therefore, a ball mill was used to simulate the mechanical forces experienced by the resin during use.

[0055] Specifically, 5.00g of the shaped resin was weighed and added to the exchange column. A 2M sodium hydroxide solution was added to the column using a peristaltic pump at a flow rate of 10mL / min for 5 minutes to simulate the adverse factors that increase the breakage rate during the regeneration of D301 ion exchange resin. After washing away the residual sodium hydroxide on the resin surface with deionized water, the resin was transferred to a stainless steel cylinder, and 10 ceramic balls were added. The stainless steel cylinder, along with the resin and ceramic balls, was then rotated in a ball mill at 120rpm for 20 minutes. During this time, the ceramic balls rubbed against the resin particles, and there was also friction between the resin particles and the inner wall of the stainless steel cylinder, as well as between the resin particles themselves. This simulated the adverse mechanical forces experienced by the resin particles during transport by water flow within the container. Both of these adverse factors cause some spherical resin particles to break down into smaller particles, increasing the breakage rate of the resin.

[0056] S4: Measure the resin samples of the tree after applying simulated adverse factors; The resin sample after adverse factors were applied was added to a laser particle size analyzer, and the particle size distribution of the ion exchange resin was measured by the laser particle size analyzer.

[0057]

[0058] Based on the particle size distribution of the sample, draw a particle size distribution histogram. Figure 8 ), and fit the particle size distribution curve:

[0059] Particle size distribution curve as shown Figure 9 As shown.

[0060] Based on the fitted particle size distribution curve, the volume distribution curve of the resin particles is calculated:

[0061] like Figure 10As shown in the diagram, comparing the particle size distribution of the resin before and after the application of adverse factors, before the application of adverse factors, there were almost no resin particles distributed in the 0~0.52mm particle size range, while after the application of adverse factors, resin particles showed a clear distribution in the 0~0.52mm range. Therefore, the particles in this particle size range are small particles produced after the original resin particles were broken down due to the adverse factors. The particle volume range corresponding to the 0~0.52mm particle size is 0~0.074mm. 3 Therefore, the volume distribution curve of the resin particles was calculated to be 0~0.074 mm. 3 The ratio of the total volume of the particles to the total volume of the resin can be used to calculate the breakage rate of the resin particles after the application of adverse factors.

[0062]

[0063] By calculating the volume distribution curves of resin particles before and after applying simulated adverse factors, it was found that the breakage rate of this type D301 ion exchange resin was 93.7% after the adverse factors were applied. The breakage rate of other resins was then measured using the same method, allowing for a comparison of the strength of different resins.

[0064] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the scope of the invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0065] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can be appropriately combined to form other embodiments that can be understood by those skilled in the art. The above content is only for illustrating the technical concept of the present invention and should not be construed as limiting the scope of protection of the present invention. Any modifications made based on the technical concept proposed in this invention shall fall within the scope of protection of the claims of this invention.

Claims

1. A method for measuring the strength of ion exchange resins using laser particle size distribution, characterized in that, include: The ion exchange resin sample is shaped to ensure it is in a defined and stable state. Weigh a set amount of the ion exchange resin sample after shaping, put it into a laser particle size analyzer, and obtain the particle size distribution of the ion exchange resin particles. By fitting the particle size distribution of ion exchange resin particles, the particle size distribution curve is obtained, and the volume distribution curve of the particles before the application of adverse factors is calculated. Based on the resin's usage environment, various adverse factors are simulated to be applied to the resin. The resin that has been subjected to various adverse factors is placed into a laser particle size analyzer to obtain the particle size distribution of the ion exchange resin particles. By fitting the particle size distribution curve of the ion exchange resin particles, the volume distribution curve of the particles after applying adverse factors is calculated. By analyzing the volume distribution curves of resin particles before and after applying adverse factors, the breakage rate of resin particles can be calculated, thereby reflecting the strength of the resin.

2. The method for measuring the strength of ion exchange resin by laser particle size distribution according to claim 1, characterized in that, The fragmentation rate is the percentage of the volume of non-spherical particles in the ion exchange resin relative to the total volume.

3. The method for measuring the strength of ion exchange resin by laser particle size distribution according to claim 1, characterized in that, The particle size distribution curve of the resin particles is presented in the form of a normal distribution or a superposition of multiple normal distributions, that is: in: x The particle size of the ion exchange resin particles. y For probability density, y 0、 w , x c These are parameters that describe the location and shape of a normal distribution.

4. The method for measuring the strength of ion exchange resin by laser particle size distribution according to claim 3, characterized in that, The volume distribution curve of the resin particles is calculated from the particle size distribution curve, that is: in: x The particle size of the ion exchange resin particles. y For probability density, y 0、 w , x c These are parameters that describe the location and shape of a normal distribution.

5. The method for measuring the strength of ion exchange resin by laser particle size distribution according to claim 1, characterized in that, After applying adverse factors, some resin particles break into smaller particles. Therefore, compared with before applying adverse factors, a new peak will appear in the particle size distribution curve in the smaller particle size range. By integrating the volume distribution curve of the volume range corresponding to this particle size range and dividing it by the integral value of the volume distribution curve after applying adverse factors, the volume ratio of broken particles, i.e., the breakage rate, can be obtained.

6. The method for measuring the strength of ion exchange resin by laser particle size distribution according to claim 1, characterized in that, By comparing the breakage rate of different resins subjected to the same adverse factors, the strength of the resin can be accurately reflected.

7. The method for measuring the strength of ion exchange resin by laser particle size distribution according to claim 1, characterized in that, The simulated adverse factors include: the impact force of water flow on the ion exchange resin particles, the stress generated by soaking in acid and alkali solutions, and the friction and extrusion forces between particles or between particles and the container.

8. The method for measuring the strength of ion exchange resin by laser particle size distribution according to claim 7, wherein different types and brands of resin particles have different strengths, and different proportions of resin particles are broken, changing from spherical particles to broken particles.

9. A method for measuring the strength of ion exchange resin by laser particle size distribution according to claim 7, characterized in that, The simulated adverse factors, such as the impact force of water flow and the stress caused by soaking in acid and alkali solutions, are achieved by adding acid and alkali solutions to the resin located in the exchange column.

10. A method for measuring the strength of ion exchange resin by laser particle size distribution according to claim 7, characterized in that, The simulated adverse factors of friction and extrusion are achieved by ball milling the resin particles.

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