Method and system for acid recovery for purification of carbon nanotubes using ceramic membranes

Abstract

The present invention discloses a method and system for recovering acid from carbon nanotube purification using a ceramic membrane, and relates to the technical field of carbon nanotube purification recovery, including: delivering carbon nanotube purification waste liquid to the feed end of a corrosion-resistant ceramic membrane assembly; adjusting the first parameter of the corrosion-resistant ceramic membrane assembly to a preset range, performing diffusion dialysis, and allowing the acid component in the carbon nanotube purification waste liquid to selectively permeate the ceramic membrane in the corrosion-resistant ceramic membrane assembly; real-time monitoring of the concentration of the acid component that permeates the ceramic membrane, calculating the dynamic separation index of the acid component according to the concentration, and automatically activating the automatic switching system when it exceeds a preset threshold value, and introducing the acid component into different recovery acid storage tanks; the control system automatically adjusts the delivery rate and the first parameter of the carbon nanotube purification waste liquid according to the dynamic separation index, and optimizes the recovery efficiency of the acid component. The present invention realizes multi-parameter coordinated optimization and real-time regulation, thereby improving the acid recovery efficiency in the purification process, reducing energy consumption, and extending the life of the equipment.

Description

Technical Field

[0001] The invention relates to the technical field of carbon nanotube purification, in particular to a method and system for recovering acid used in purifying carbon nanotubes using a ceramic membrane. Background Art

[0002] Carbon nanotubes have shown broad application prospects in many fields due to their unique physical and chemical properties. However, the treatment of strong acid or mixed acid waste liquid used in its purification process has always been a thorny problem. Traditional acid recovery methods mainly include distillation, ion exchange and membrane separation. Among them, membrane separation technology has gradually become a research hotspot due to its advantages such as low energy consumption and high separation efficiency. In recent years, the application of corrosion-resistant ceramic membranes in strong acid environments has attracted widespread attention. Their excellent chemical stability and mechanical strength make them an ideal choice for treating strong acid waste liquid. However, the existing corrosion-resistant ceramic membrane acid recovery technology still has some problems that need to be solved, such as membrane fouling, concentration polarization and system parameter optimization.

[0003] At present, most corrosion-resistant ceramic membrane acid recovery systems in the carbon nanotube purification process use fixed parameter control or simple PID control, which is difficult to adapt to carbon nanotube purification waste liquids of different types and concentrations. This control method often cannot achieve the best separation effect when facing a complex separation process, resulting in low acid recovery efficiency. In addition, the existing technology also has shortcomings in membrane pollution control and system energy consumption optimization. Membrane pollution will lead to a decrease in separation efficiency and a shortened equipment life, while energy consumption issues directly affect the economy of the entire recovery process. The existing technology usually uses a single parameter control, which is difficult to achieve multi-objective optimization, which is particularly obvious when dealing with complex mixed acid waste liquids. At the same time, the lack of accurate grasp of the dynamic characteristics of the system makes it difficult to respond to changes in the system state in a timely manner in actual operation, thereby affecting the stability and efficiency of the entire recovery process. Summary of the invention

[0004] In view of the above-mentioned problems, the present invention is proposed.

[0005] Therefore, the technical problem solved by the present invention is: how to provide a method and system for acid recovery of carbon nanotube purification using ceramic membranes, so as to solve the problems of low recovery efficiency, high energy consumption, short equipment life, etc. generally existing in the existing corrosion-resistant ceramic membrane acid recovery technology in the carbon nanotube purification process when treating carbon nanotube purification waste liquid.

[0006] In order to solve the above technical problems, the present invention provides the following technical solutions: a method for recovering acid from carbon nanotube purification using a ceramic membrane, comprising: transporting carbon nanotube purified waste liquid to the feed end of a corrosion-resistant ceramic membrane assembly; adjusting a first parameter of the corrosion-resistant ceramic membrane assembly to a preset range, performing diffusion dialysis on the carbon nanotube purified waste liquid, so that the acid component in the carbon nanotube purified waste liquid selectively passes through the ceramic membrane in the corrosion-resistant ceramic membrane assembly; real-time monitoring of the concentration of the acid component passing through the ceramic membrane, calculating a dynamic separation index of the acid component based on the concentration, and when the dynamic separation index exceeds a preset threshold, the control system automatically activates an automatic switching system to introduce the acid component into different recovered acid liquid storage tanks. ; The control system automatically adjusts the delivery rate of the carbon nanotube purification waste liquid and the first parameter according to the dynamic separation index to optimize the recovery efficiency of the acid component; the calculation process of the dynamic separation index includes the following steps: obtaining the discharge acid component concentration and the feed acid component concentration at the current moment; obtaining the discharge flow rate and the feed flow rate at the current moment; calculating the ratio of the discharge acid component concentration to the feed acid component concentration; calculating the rate of change of the discharge acid component concentration relative to time; calculating the dynamic adjustment factor based on the rate of change of the discharge acid component concentration relative to time and a preset weight coefficient; calculating the dynamic separation index based on the ratio of the discharge acid component concentration to the feed acid component concentration, the ratio of the discharge flow rate to the feed flow rate and the dynamic adjustment factor.

[0007] As a preferred embodiment of the method for acid recovery of carbon nanotube purification using ceramic membrane described in the present invention, the method comprises the following steps: transporting the carbon nanotube purified waste liquid to the feed end of the corrosion-resistant ceramic membrane assembly: opening the liquid outlet valve of the waste liquid storage tank to allow the carbon nanotube purified waste liquid to enter the liquid inlet pipeline of the feed system; starting the acid-resistant pump in the feed system to pump the carbon nanotube purified waste liquid into the transport pipeline connected to the feed end; opening the liquid inlet valve of the feed end to allow the carbon nanotube purified waste liquid to enter the corrosion-resistant ceramic membrane assembly; detecting the flow rate of the carbon nanotube purified waste liquid by a flowmeter; if the detected flow rate is lower than the preset flow lower limit threshold, closing the acid-resistant pump and all valves, and issuing an alarm signal; if the detected flow rate is higher than the preset flow upper limit threshold, reducing the speed of the acid-resistant pump; if the detected flow rate is between the preset flow upper limit threshold and the preset flow lower limit threshold, confirming that the carbon nanotube purified waste liquid has successfully entered the feed end of the corrosion-resistant ceramic membrane assembly.

[0008] As a preferred embodiment of the method for acid recovery for purifying carbon nanotubes using a ceramic membrane according to the present invention, the first parameter includes a pressure parameter and a vibration parameter; the pressure parameter is the feed end pressure, and the vibration parameter is the vibration frequency of the vibration device of the corrosion-resistant ceramic membrane assembly; adjusting the first parameter of the corrosion-resistant ceramic membrane assembly to a preset range comprises the following steps: adjusting the feed end pressure of the corrosion-resistant ceramic membrane assembly to an initial value of the preset pressure range, and setting the initial vibration frequency of the vibration device of the corrosion-resistant ceramic membrane assembly; starting the vibration device to apply micro-vibration of the initial vibration frequency to the ceramic membrane in the corrosion-resistant ceramic membrane assembly; monitoring the pressure difference on both sides of the corrosion-resistant ceramic membrane assembly and the concentration of the acid component passing through the ceramic membrane in real time; and dynamically adjusting the feed end pressure and the vibration frequency through a fuzzy control algorithm according to the coordinated changes of the pressure difference, the concentration of the acid component and the instantaneous separation efficiency of the acid component until the feed end pressure and the vibration frequency are adjusted to the preset range.

[0009] As a preferred embodiment of the method for acid recovery of carbon nanotube purification using ceramic membranes described in the present invention, wherein: according to the coordinated changes in the pressure difference and the concentration of the acid component, the feed end pressure and the vibration frequency are dynamically adjusted by a fuzzy control algorithm until the feed end pressure and the vibration frequency are stabilized within their respective preset ranges, including the following steps: taking the pressure difference and the concentration of the acid component as input variables, and performing adaptive fuzzification processing on the input variables; dynamically updating the fuzzy rule base according to the system response: if the pressure difference is greater than the preset allowable error of the system and the concentration of the acid component decreases, then increasing the weight of the "adjust feed pressure" rule; if the instantaneous separation efficiency of the acid component decreases and the pressure difference is less than the preset allowable error of the system, then increasing the weight of the "adjust vibration frequency" rule; based on the updated fuzzy rule base, performing adaptive fuzzification processing on the input variables after the fuzzy processing; Multi-objective optimization reasoning; performing adaptive defuzzification processing on the results of the multi-objective optimization reasoning to obtain the adjustment amount of the feed end pressure and vibration frequency; updating the feed end pressure and vibration frequency according to the adjustment amount; calculating the deviation between the updated feed end pressure and vibration frequency and their respective target values: if the deviations of both are less than the corresponding system preset allowable errors, then keep the current settings; if the deviation of either is greater than or equal to the corresponding system preset allowable error, then use the pressure difference and the concentration of the acid component as input variables, and perform adaptive fuzzification processing on the input variables, and continue to adjust; determine whether the feed end pressure and vibration frequency are stable within their respective preset ranges, specifically, if the deviations of the feed end pressure and vibration frequency from their respective target values ​​are continuously less than the system preset allowable errors, and the maintenance time reaches the system preset stabilization time, then the adjustment is completed; otherwise, repeat the above steps.

[0010] As a preferred embodiment of the method for acid recovery for purifying carbon nanotubes using a ceramic membrane according to the present invention, real-time monitoring of the concentration of the acid component passing through the ceramic membrane is specifically performed by continuously collecting the concentration of the acid component passing through the ceramic membrane using a concentration monitoring system, and transmitting the data to a control system.

[0011] As a preferred embodiment of the method for acid recovery of carbon nanotube purification using ceramic membranes described in the present invention, the control system automatically adjusts the delivery rate of the carbon nanotube purified waste liquid and the first parameter of the corrosion-resistant ceramic membrane component according to the dynamic separation index, including the following steps: the control system calculates the change rate of the dynamic separation index and compares it with the change rate threshold; if the change rate of the dynamic separation index is positive and greater than the change rate threshold, the control system sends an instruction to the feeding system to increase the delivery rate of the carbon nanotube purified waste liquid, and at the same time sends an instruction to the pressure regulation system to reduce the vibration frequency of the corrosion-resistant ceramic membrane component; if the change rate of the dynamic separation index is negative and the absolute value is greater than the change rate threshold, the control system sends an instruction to the feeding system to reduce the delivery rate of the carbon nanotube purified waste liquid, and at the same time sends an instruction to the pressure regulation system to increase the vibration frequency of the corrosion-resistant ceramic membrane component; the control system calculates the required feed end pressure according to the adjusted delivery rate; if the difference between the calculated feed end pressure and the current feed end pressure is greater than the preset pressure adjustment threshold, the control system sends an instruction to the pressure regulation system to adjust the feed end pressure to the calculated value.

[0012] As a preferred embodiment of the method for recovering acid from carbon nanotube purification using a ceramic membrane according to the present invention, the carbon nanotube purification waste liquid contains a strong acid or a mixed acid.

[0013] To further solve the above technical problems, the present invention provides the following technical solutions: an acid recovery system for purifying carbon nanotubes using a ceramic membrane, comprising: a corrosion-resistant ceramic membrane assembly, used for performing diffusion dialysis on carbon nanotube purified waste liquid, so that the acid component in the carbon nanotube purified waste liquid selectively permeates the ceramic membrane inside it; a waste liquid storage tank, used for storing carbon nanotube purified waste liquid containing strong acid or mixed acid; a feeding system, used for transporting the carbon nanotube purified waste liquid from the waste liquid storage tank to the feeding end of the corrosion-resistant ceramic membrane assembly; a pressure regulating system, used for adjusting a first parameter of the corrosion-resistant ceramic membrane assembly to a preset range; a concentration monitoring system, used for real-time monitoring the concentration of the acid component that passes through the ceramic membrane; a control system, used for automatically activating an automatic switching system according to the concentration of the acid component provided by the concentration monitoring system, and sending an adjustment instruction to the feeding system and the pressure regulating system to optimize the recovery efficiency of the acid component; an automatic switching system, used for introducing the acid component into different recovered acid liquid storage tanks when the concentration of the acid component reaches a preset threshold; and a recovered acid liquid storage tank, used for storing recovered acid liquids of different concentrations.

[0014] A computer device comprises a memory and a processor, wherein the memory stores a computer program, and when the processor executes the computer program, the steps of the method for acid recovery for purifying carbon nanotubes using a ceramic membrane are implemented.

[0015] A computer-readable storage medium stores a computer program, which, when executed by a processor, implements the steps of the method for acid recovery in purifying carbon nanotubes using a ceramic membrane as described above.

[0016] Beneficial effects of the present invention: The present invention realizes efficient recovery of acid components in waste liquid during the purification process of carbon nanotubes, and adopts a method of dynamically adjusting the first parameter to improve separation efficiency and equipment life. The concept of dynamic separation index is introduced, and combined with an automatic switching system, accurate graded recovery of acid components is achieved. Through closed-loop control based on the dynamic separation index, real-time optimization of system parameters is achieved. This full-process intelligent control not only improves the acid recovery efficiency during the purification process, but also enhances the system's adaptability to waste liquids of different types and concentrations. Through multi-parameter collaborative optimization, the present invention effectively reduces energy consumption, reduces resource waste, and improves the stability and reliability of the entire process. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0018] Figure 1 An overall flow chart of a method for acid recovery for purifying carbon nanotubes using a ceramic membrane provided in one embodiment of the present invention.

[0019] Figure 2 A computer device diagram of the method for acid recovery for purifying carbon nanotubes using a ceramic membrane according to the present invention. DETAILED DESCRIPTION

[0020] In order to make the above-mentioned purposes, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the drawings of the specification. Obviously, the described embodiments are part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary persons in the art without creative work should fall within the scope of protection of the present invention.

[0021] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0022] In the related art, most corrosion-resistant ceramic membrane acid recovery systems use fixed parameter control or simple PID control, which is difficult to adapt to carbon nanotube purification waste liquids of different types and concentrations. This control method often cannot achieve the best separation effect when facing a complex separation process, resulting in low acid recovery efficiency. In addition, the existing technology also has shortcomings in membrane pollution control and system energy consumption optimization. Membrane pollution will lead to a decrease in separation efficiency and a shortened equipment life, while energy consumption issues directly affect the economy of the entire recovery process. The existing technology usually uses a single parameter control, which is difficult to achieve multi-objective optimization, which is particularly obvious when dealing with complex mixed acid waste liquids. At the same time, the lack of accurate grasp of the dynamic characteristics of the system makes it difficult to respond to changes in the system state in a timely manner during actual operation, thereby affecting the stability and efficiency of the entire recovery process.

[0023] The present application provides a method that can effectively solve the above-mentioned problems. Next, a plurality of embodiments will be combined to explain in detail how to implement the method of acid recovery for purifying carbon nanotubes using a ceramic membrane;

[0024] Example 1, reference Figure 1 , is an embodiment of the present invention, Figure 1 The overall flow chart of the method for acid recovery of carbon nanotube purification using a ceramic membrane is shown, comprising:

[0025] S1: transporting the carbon nanotube purified waste liquid to the feed end of the corrosion-resistant ceramic membrane module;

[0026] S2: adjusting the first parameter of the corrosion-resistant ceramic membrane assembly to a preset range, performing diffusion dialysis on the incoming carbon nanotube purified waste liquid, so that the acid component in the carbon nanotube purified waste liquid selectively permeates the ceramic membrane in the corrosion-resistant ceramic membrane assembly;

[0027] S3: Real-time monitoring of the concentration of the acid components that pass through the ceramic membrane, and calculation of the dynamic separation index of the acid components based on the concentration. When the dynamic separation index exceeds the preset threshold, the control system automatically activates the automatic switching system to direct the acid components into different recovered acid storage tanks;

[0028] S4: The control system automatically adjusts the delivery rate and the first parameter of the carbon nanotube purification waste liquid according to the dynamic separation index to optimize the recovery efficiency of the acid component.

[0029] Next, each step in S1~S4 is explained in detail.

[0030] S1: transporting the carbon nanotube purified waste liquid to the feed end of the corrosion-resistant ceramic membrane module.

[0031] In an optional embodiment, the carbon nanotube purification waste liquid may contain strong acid or mixed acid. The carbon nanotube purification waste liquid containing strong acid or mixed acid is transported from the waste liquid storage tank to the feed end of the corrosion-resistant ceramic membrane module through the feed system.

[0032] S1.1: Open the outlet valve of the waste liquid storage tank to allow the carbon nanotube purified waste liquid to enter the liquid inlet pipeline of the feeding system.

[0033] S1.2: Start the acid-resistant pump in the feeding system to pump the carbon nanotube purification waste liquid into the delivery pipeline connected to the feeding end.

[0034] S1.3: Open the liquid inlet valve at the feed end to allow the carbon nanotube purified waste liquid to enter the corrosion-resistant ceramic membrane assembly.

[0035] S1.4: The flow rate of the carbon nanotube purified waste liquid is detected by a flow meter; if the detected flow rate is lower than the preset lower flow limit threshold, the acid-resistant pump and all valves are closed, and an alarm signal is issued; if the detected flow rate is higher than the preset upper flow limit threshold, the speed of the acid-resistant pump is reduced; if the detected flow rate is between the preset upper flow limit threshold and the preset lower flow limit threshold, it is confirmed that the carbon nanotube purified waste liquid has successfully entered the feed end of the corrosion-resistant ceramic membrane assembly.

[0036] It should be noted that in actual applications, the preset flow upper limit threshold and the preset flow lower limit threshold can be set based on multiple factors, such as the processing capacity of the corrosion-resistant ceramic membrane assembly, the safe operating range of the system, the optimization requirements for acid recovery efficiency, and the physical limitations of the equipment. The setting of the preset flow upper limit threshold is mainly to prevent system overload and membrane assembly damage to ensure safe operation, while the preset flow lower limit threshold is used to detect possible leakage, blockage or equipment failure to ensure the minimum processing efficiency. The specific values ​​of these two thresholds are usually determined by experimental data, equipment specifications and engineering experience, and may be dynamically adjusted according to actual operating conditions to achieve the best performance and reliability of the system.

[0037] Preferably, step S1 controls the delivery process of the waste liquid purified by carbon nanotubes, combined with real-time flow monitoring and adaptive adjustment mechanism, which not only improves the stability and reliability of waste liquid delivery, but also effectively prevents potential risks such as equipment damage and waste liquid leakage. Compared with the traditional fixed parameter delivery method, this dynamic adjustment method can better adapt to waste liquids of different concentrations and components, significantly improves the adaptability and operational safety of the system, and at the same time, by accurately controlling the input flow, it lays a stable foundation for the subsequent acid recovery process, which helps to improve the overall acid recovery efficiency and the economy of system operation.

[0038] S2: adjusting the first parameter of the corrosion-resistant ceramic membrane assembly to a preset range, performing diffusion dialysis on the carbon nanotube purified waste liquid, and allowing the acid component in the carbon nanotube purified waste liquid to selectively permeate the ceramic membrane in the corrosion-resistant ceramic membrane assembly.

[0039] In an optional embodiment, the first parameter of the corrosion-resistant ceramic membrane assembly is adjusted to a preset range by a pressure regulating system. The first parameter includes a pressure parameter and a vibration parameter, wherein the pressure parameter is the feed end pressure, and the vibration parameter is the vibration frequency of the vibration device of the corrosion-resistant ceramic membrane assembly.

[0040] S2.1: Adjust the feed end pressure of the corrosion-resistant ceramic membrane assembly to an initial value within a preset pressure range, and simultaneously set the initial vibration frequency of the vibration device of the corrosion-resistant ceramic membrane assembly.

[0041] It should be noted that the preset pressure range is the working pressure range of the feed end of the corrosion-resistant ceramic membrane assembly that is predetermined to ensure effective separation of the acid components during the diffusion dialysis process of the carbon nanotube purified waste liquid. This range is usually determined based on the performance parameters of the corrosion-resistant ceramic membrane, the characteristics of the carbon nanotube purified waste liquid, and the required separation efficiency to ensure the best acid recovery effect while protecting the membrane assembly. The initial value of the preset pressure range refers to the starting pressure value of the feed end of the corrosion-resistant ceramic membrane assembly that is first set when the diffusion dialysis process is started. This initial value is usually selected near the lower limit of the preset pressure range so that it can be dynamically adjusted according to the actual situation in the subsequent process, thereby gradually optimizing the separation effect.

[0042] The vibration device of the corrosion-resistant ceramic membrane assembly is an auxiliary device installed on the corrosion-resistant ceramic membrane assembly, which is used to apply controllable mechanical vibration to the ceramic membrane. The vibration device usually includes a vibration source (such as a piezoelectric ceramic or an electromagnetic vibrator), a vibration transmission mechanism and a control system, which can generate precise and controllable micro-vibrations to enhance the mass transfer process of the acid component and reduce membrane fouling. The initial vibration frequency of the vibration device refers to the starting vibration frequency value set when the vibration device is started. The selection of this frequency value is based on the structural characteristics of the corrosion-resistant ceramic membrane, the physical and chemical properties of the carbon nanotube purified waste liquid, and the previous experimental data, and aims to provide a suitable reference point for subsequent dynamic adjustments to achieve a gradual optimization of the separation efficiency of the acid component.

[0043] S2.2: Start the vibration device to apply micro-vibration of the initial vibration frequency to the ceramic membrane in the corrosion-resistant ceramic membrane assembly.

[0044] It should be noted that in the present invention, the corrosion-resistant ceramic membrane assembly is a core separation unit for treating carbon nanotube purification waste liquid containing strong acid or mixed acid. The corrosion-resistant ceramic membrane assembly is made of high-performance corrosion-resistant ceramic materials, usually , or The materials are precisely prepared and have excellent chemical stability, mechanical strength and thermal stability. The ceramic membrane structure inside the corrosion-resistant ceramic membrane assembly has precisely controlled pore size distribution and surface characteristics, which can achieve efficient and selective separation of acid components in carbon nanotube purification wastewater under harsh acidic environments.

[0045] In addition, the corrosion-resistant ceramic membrane assembly integrates the feed end, the discharge end and the support structure, and works closely with the pressure regulation system, allowing its first parameter (pressure parameter and vibration parameter) to be precisely regulated. This design enables the assembly to maintain optimal separation performance under different operating conditions. During the diffusion dialysis process, the acid component selectively penetrates the ceramic membrane driven by the concentration gradient and pressure difference, while the carbon nanotubes and other impurities are effectively blocked.

[0046] S2.3: Monitor the pressure difference on both sides of the corrosion-resistant ceramic membrane assembly and the concentration of the acid component that passes through the ceramic membrane in real time; according to the coordinated changes in the pressure difference and the concentration of the acid component, dynamically adjust the feed end pressure and vibration frequency through the fuzzy control algorithm until the feed end pressure and vibration frequency are stabilized within their respective preset ranges.

[0047] It should be noted that, according to the coordinated changes in the pressure difference and the concentration of the acid component, the feed end pressure and the vibration frequency are dynamically adjusted by the fuzzy control algorithm until the feed end pressure and the vibration frequency are stabilized within their respective preset ranges, including:

[0048] a) Taking the pressure difference and the concentration of the acid component as input variables, and performing adaptive fuzzy processing on the input variables;

[0049] b) Dynamically update the fuzzy rule base according to system response:

[0050] If the pressure difference is greater than the preset allowable error of the system and the concentration of the acid component decreases, the weight of the "adjust feed pressure" rule is increased;

[0051] If the instantaneous separation efficiency of the acid component decreases and the pressure difference is less than the preset allowable error of the system, the weight of the "adjust vibration frequency" rule is increased;

[0052] The instantaneous separation efficiency of the acid component is calculated by real-time monitoring of the concentration and flow rate of the acid component at the feed end and the discharge end. The calculation principle is as follows:

[0053] ;

[0054] in, is the instantaneous separation efficiency of the acid component ; is the feed acid component concentration (mol / L); is the concentration of the acid component in the discharge (mol / L); is the feed flow rate (L / s); is the discharge flow rate (L / s).

[0055] This formula calculates the acid component retention rate from feed to discharge, that is, what proportion of the acid component is successfully separated. In practical applications, it is also necessary to consider the effect of the pressure difference on the two sides of the membrane on the flow rate. For this purpose, the pressure factor is introduced, and the modified formula is as follows:

[0056] ;

[0057] in, is the feed end pressure (Pa); is the discharge end pressure (Pa).

[0058] c) Based on the updated fuzzy rule base, multi-objective optimization reasoning is performed on the input variables after adaptive fuzzification processing;

[0059] d) Adaptively defuzzify the results of the multi-objective optimization reasoning to obtain the adjustment amount of the feed end pressure and vibration frequency;

[0060] e) Update the feed end pressure and vibration frequency according to the adjustment amount, while ensuring that they do not exceed the safe operating parameters of the equipment;

[0061] f) Calculate the deviation of the updated feed end pressure and vibration frequency from their respective target values:

[0062] If the deviations of both are less than the preset allowable errors of their corresponding systems, the current settings are maintained;

[0063] If the deviation of any parameter is greater than or equal to the corresponding system preset allowable error, return to step a) to continue adjustment;

[0064] g) Continuously monitor to determine whether the feed end pressure and vibration frequency are stable within their respective preset ranges: if the deviation of the feed end pressure and vibration frequency is continuously smaller than the system preset allowable error, and the state is maintained for a preset stabilization time, the adjustment is completed; otherwise, continue to perform steps a) to f).

[0065] It should be noted that the equipment safe operation parameters refer to a series of key parameter limits pre-set in the corrosion-resistant ceramic membrane acid recovery system to ensure the long-term stable operation of the equipment. These parameters usually include but are not limited to the maximum allowable feed pressure, the minimum allowable feed pressure, the maximum allowable vibration frequency, the minimum allowable vibration frequency, the maximum allowable pressure difference, etc. The setting of these parameters is based on the material properties, structural strength, corrosion resistance and long-term operation data analysis results of the corrosion-resistant ceramic membrane components. During the operation of the system, no matter how the control algorithm adjusts the operating parameters, it must ensure that these safe operating parameters are not exceeded to prevent equipment damage, extend service life, and ensure the safety of operators. These parameters are usually provided by the equipment manufacturer and may be fine-tuned according to specific application scenarios and operating experience.

[0066] In an optional embodiment, an initialization step can be added before the start of the entire process (referring to steps a) to g) to clearly set the preset allowable error and stabilization time of the system, specifically, according to the performance characteristics of the corrosion-resistant ceramic membrane assembly, the typical composition and rheological properties of the carbon nanotube purification waste liquid, to set the preset allowable error and stabilization time of the system. Among them, the allowable error defines the maximum acceptable deviation between parameters such as feed pressure and vibration frequency and their target values, usually expressed as a percentage or absolute value; the stabilization time defines the shortest time period that the parameters need to be continuously maintained within the allowable error range to confirm that the system has reached a stable state. The determination of these initial set values ​​is usually based on experimental data, process simulation results and expert experience, and may be dynamically optimized according to actual performance during system operation.

[0067] S2.4: Under the conditions of dynamically adjusted feed end pressure and vibration frequency, the carbon nanotube purified waste liquid is subjected to diffusion dialysis to allow the acid component to selectively pass through the ceramic membrane.

[0068] It should be noted that the purpose of adjusting the vibration frequency is to optimize the membrane separation process. Specifically: 1. Reduce membrane fouling: Appropriate vibration can reduce concentration polarization and pollutant accumulation on the membrane surface. 2. Improve mass transfer efficiency: Vibration can break the liquid boundary layer and promote material transfer. 3. Extend membrane life: By reducing membrane fouling, the service life of the membrane can be extended. 4. Improve separation efficiency: Appropriate vibration can increase the permeability of the acid component.

[0069] Preferably, step S2 significantly improves the separation efficiency of the acid component in the carbon nanotube purification wastewater and the overall system performance by precisely controlling and dynamically adjusting the first parameters (pressure parameters and vibration parameters) of the corrosion-resistant ceramic membrane assembly. Compared with the prior art, this is mainly reflected in the following aspects:

[0070] First, the vibration parameters are used as control variables to reduce membrane fouling and concentration polarization by adjusting the vibration frequency, thereby extending the membrane life and improving the mass transfer efficiency. This is an important improvement over the traditional separation method that relies solely on pressure regulation.

[0071] Secondly, according to the coordinated changes in the pressure difference and the concentration of the acid component, the system can always be kept in the best working state by dynamically adjusting the first parameter through the fuzzy control algorithm. Compared with fixed parameter operation or simple PID control, this method is more adaptable to the fluctuations in the composition and concentration of the carbon nanotube purification wastewater, and improves the adaptability and stability of the system.

[0072] Furthermore, the instantaneous separation efficiency of the acid component is taken as a key performance indicator and incorporated into the control algorithm. This approach not only takes into account concentration, but also comprehensively considers flow and pressure factors, providing a more comprehensive and accurate evaluation of the separation effect, which helps to achieve more precise process control and optimization.

[0073] Finally, by setting the preset tolerance and stabilization time, combined with the continuous monitoring mechanism, it is ensured that the system can maintain stable operation after reaching the optimal state. This method effectively avoids frequent fluctuations in parameters and improves the stability and reliability of the system.

[0074] In summary, step S2 achieves efficient separation of acid components in carbon nanotube purified waste liquid. Through intelligent control and multi-parameter optimization, the present invention not only improves the acid recovery efficiency, but also prolongs the service life of the equipment, reduces energy consumption, and improves the adaptability and reliability of the system. These improvements are of great significance for treating carbon nanotube purified waste liquids of different types and concentrations, and provide more efficient and economical solutions for related industrial applications.

[0075] S3: Monitor the concentration of the acid components passing through the ceramic membrane in real time, and calculate the dynamic separation index of the acid components based on the concentration. When the dynamic separation index exceeds the preset threshold, the control system automatically activates the automatic switching system to introduce the acid components into different recovered acid storage tanks.

[0076] In an optional embodiment, a concentration monitoring system is used to monitor the concentration of the acid component that permeates the ceramic membrane in real time.

[0077] S3.1: Continuously collect the concentration of the acid components that pass through the ceramic membrane using a concentration monitoring system and transmit the data to the control system;

[0078] S3.2: The control system calculates the dynamic separation index of the acid component based on the collected concentration;

[0079] S3.3: If the dynamic separation index exceeds a preset threshold, the control system automatically activates the automatic switching system;

[0080] S3.4: The automatic switching system introduces the acid components into the corresponding recovered acid storage tanks.

[0081] The calculation process of the dynamic separation index includes the following steps:

[0082] Get the current time t The acid component concentration of the discharge and feed acid component concentration ;

[0083] Get the current time t Discharge flow and feed flow ;

[0084] Calculate the ratio of the acid component concentration of the output to the acid component concentration of the feed:

[0085] ;

[0086] Calculate the ratio of discharge flow to feed flow:

[0087] ;

[0088] Calculate the rate of change of the acid component concentration in the output relative to time:

[0089] ;

[0090] Based on the change rate of the acid component concentration of the discharged material relative to time and the preset weight coefficient α Calculate the dynamic adjustment factor:

[0091] ;

[0092] in, α is a preset weight coefficient, which is a constant and is used to adjust the influence of the concentration change rate in the calculation of the dynamic separation index.

[0093] The dynamic separation index DPI is calculated based on the ratio of the acid component concentration of the discharge to the acid component concentration of the feed, the ratio of the discharge flow rate to the feed flow rate, and the dynamic adjustment factor:

[0094] .

[0095] Preferably, the dynamic separation index is a comprehensive index used to evaluate the separation effect of the acid component during the carbon nanotube purification process. The index takes into account multiple key factors, including the concentration of the acid component, the flow rate, and the concentration change trend. The dynamic separation index consists of the following parts:

[0096] Concentration ratio: The ratio of the concentration of the acid component in the discharge to the concentration of the acid component in the feed, which reflects the basic effect of membrane separation.

[0097] Flow ratio: The ratio of discharge flow to feed flow, which reflects the material balance of the system.

[0098] Dynamic adjustment factor: includes the rate of change of discharge concentration and reflects the dynamic characteristics of the separation process.

[0099] Weight coefficient: used to adjust the influence of dynamic characteristics in the overall index so that the index can adapt to different types of carbon nanotube purification wastewater.

[0100] In the present invention, the calculation of the dynamic separation index makes the control of the acid recovery process more accurate and flexible. Not only the instantaneous separation effect is taken into account, but also the changing trend of the separation effect can be reflected, which helps the system to more accurately grasp the best acid component collection time. By adjusting the weight coefficient, the index can adapt to carbon nanotube purification waste liquids of different types and concentrations, thereby improving the versatility and adaptability of the method.

[0101] In actual applications, when the dynamic separation index exceeds the preset threshold, it indicates that the acid component separation effect has reached an ideal state, and the system will automatically start the collection process. Compared with the traditional method that only relies on a single concentration value, this control method based on comprehensive indicators can better optimize the acid recovery efficiency, reduce resource waste, and improve the economy and environmental protection of the entire carbon nanotube purification process.

[0102] S4: The control system automatically adjusts the delivery rate of the carbon nanotube purified waste liquid and the first parameter of the corrosion-resistant ceramic membrane component according to the dynamic separation index to optimize the recovery efficiency of the acid component.

[0103] In an optional embodiment, the control system sends instructions to the feed system to adjust the delivery rate of the carbon nanotube purified waste liquid according to the dynamic separation index, and sends instructions to the pressure regulation system to adjust the first parameter of the corrosion-resistant ceramic membrane assembly to optimize the recovery efficiency of the acid component.

[0104] S4.1: The control system calculates the rate of change of the dynamic separation index and compares it with the rate of change threshold;

[0105] S4.2: If the rate of change of the dynamic separation index is positive and greater than the rate of change threshold, the control system sends an instruction to the feed system to increase the delivery rate of the carbon nanotube purified waste liquid, and at the same time sends an instruction to the pressure regulating system to reduce the vibration frequency of the corrosion-resistant ceramic membrane assembly; if the rate of change of the dynamic separation index is negative and the absolute value is greater than the rate of change threshold, the control system sends an instruction to the feed system to reduce the delivery rate of the carbon nanotube purified waste liquid, and at the same time sends an instruction to the pressure regulating system to increase the vibration frequency of the corrosion-resistant ceramic membrane assembly;

[0106] S4.3: The control system calculates the required feed end pressure according to the adjusted conveying rate; if the difference between the calculated feed end pressure and the current feed end pressure is greater than the preset pressure adjustment threshold, the control system sends a command to the pressure regulation system to adjust the feed end pressure to the calculated value.

[0107] Preferably, step S4 realizes the refined dynamic regulation of the carbon nanotube purification waste liquid treatment process by introducing the dynamic separation index and its change rate as the control basis. Compared with the prior art, step S4 calculates the change rate of the dynamic separation index, so that the system can more sensitively capture the slight changes in the separation effect, thereby achieving a faster and more accurate response. Secondly, according to the positive and negative and amplitude of the change rate, the delivery rate and vibration frequency are adjusted at the same time to achieve multi-parameter collaborative optimization. This method not only improves the system's adaptability to carbon nanotube purification waste liquids of different types and concentrations, but also maximizes the processing efficiency while ensuring the separation effect. Finally, by controlling the feed end pressure, it is ensured that the system can still maintain the best working state after the parameter adjustment. This closed-loop control strategy significantly improves the efficiency and stability of the acid recovery process, while reducing energy consumption and resource waste.

[0108] In summary, the present invention realizes the efficient recovery of acid components in carbon nanotube purification waste liquid by introducing corrosion-resistant ceramic membrane components, dynamic separation index and fuzzy control algorithm. The present invention not only improves the acid recovery efficiency, but also extends the service life of the equipment and reduces energy consumption. The system's adaptability and intelligent control enable it to cope with waste liquids of different types and concentrations, significantly improving the stability and reliability of the process. In addition, through precise control and multi-parameter collaborative optimization, the present invention effectively reduces resource waste, improves the economy and environmental protection of the entire carbon nanotube purification process, and provides a more efficient and economical solution for related industrial applications.

[0109] Example 2 is an embodiment of the present invention, which provides an acid recovery system for purifying carbon nanotubes using a ceramic membrane, including a corrosion-resistant ceramic membrane component, a waste liquid storage tank, a feeding system, a pressure regulating system, a concentration monitoring system, a control system, an automatic switching system, and a recovered acid storage tank.

[0110] The corrosion-resistant ceramic membrane assembly is used for diffusion dialysis of carbon nanotube purified waste liquid, so that the acid components in the carbon nanotube purified waste liquid can selectively pass through the ceramic membrane inside it.

[0111] The waste liquid storage tank is used to store carbon nanotube purification waste liquid containing strong acid or mixed acid.

[0112] The feeding system is used to transport the carbon nanotube purification waste liquid from the waste liquid storage tank to the feeding end of the corrosion-resistant ceramic membrane module.

[0113] The pressure regulating system is used to adjust the first parameter of the corrosion-resistant ceramic membrane assembly to a preset range.

[0114] The concentration monitoring system is used to monitor the concentration of acid components passing through the ceramic membrane in real time.

[0115] The control system is used to automatically activate the automatic switching system according to the concentration of the acid component provided by the concentration monitoring system, and send adjustment instructions to the feeding system and the pressure regulation system to optimize the recovery efficiency of the acid component.

[0116] The automatic switching system is used to direct the acid components into different recovered acid storage tanks when the acid component concentration reaches a preset threshold.

[0117] The recovered acid storage tank is used to store recovered acid of different concentrations.

[0118] Example 3, reference Figure 2 , is an embodiment of the present invention, which is different from the previous embodiment in that:

[0119] If the functions are implemented in the form of software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, or the part that contributes to the prior art, or the part of the technical solution, can be embodied in the form of a software product. The computer software product is stored in a storage medium, including several instructions to enable a computer device (which can be a personal computer, server, or network device, etc.) to perform all or part of the steps of the methods described in various embodiments of the present invention. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), disk or optical disk, etc., which can store program codes.

[0120] The logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as an ordered list of executable instructions for implementing logical functions, and can be embodied in any computer-readable medium for use by an instruction execution system, device or apparatus (such as a computer-based system, a system including a processor, or other system that can fetch instructions from an instruction execution system, device or apparatus and execute instructions), or in conjunction with such instruction execution systems, devices or apparatuses. For the purposes of this specification, "computer-readable medium" can be any device that can contain, store, communicate, propagate or transmit a program for use by an instruction execution system, device or apparatus, or in conjunction with such instruction execution systems, devices or apparatuses.

[0121] More specific examples of computer-readable media (a non-exhaustive list) include the following: an electrical connection with one or more wires (electronic device), a portable computer disk case (magnetic device), a random access memory (RAM), a read-only memory (ROM), an erasable and programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disk read-only memory (CDROM). In addition, the computer-readable medium may even be a paper or other suitable medium on which the program is printed, since the program may be obtained electronically, for example, by optically scanning the paper or other medium, followed by editing, deciphering or, if necessary, processing in another suitable manner, and then stored in a computer memory.

[0122] It should be understood that the various parts of the present invention can be implemented by hardware, software, firmware or a combination thereof. In the above-mentioned embodiments, multiple steps or methods can be implemented by software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented by hardware, as in another embodiment, it can be implemented by any one of the following technologies known in the art or their combination: a discrete logic circuit having a logic gate circuit for implementing a logic function for a data signal, a dedicated integrated circuit having a suitable combination of logic gate circuits, a programmable gate array (PGA), a field programmable gate array (FPGA), etc.

[0123] Example 4 is an embodiment of the present invention, which provides a method for acid recovery from carbon nanotube purification using a ceramic membrane. In order to verify the beneficial effects of the present invention, scientific demonstration is carried out through economic benefit calculation and simulation experiments.

[0124] The experimental process is as follows: First, prepare simulated waste liquids of different types and concentrations, including low-concentration HCL, medium-concentration H2SO4, high-concentration HNO3 and mixed acid waste liquid. Then, use the present invention and the prior art to treat these waste liquids, respectively, and record the acid recovery efficiency, energy consumption and service life data of key equipment components. In the experiment, different operating times (24h, 48h, 72h, 96h) were simulated to evaluate the long-term operating performance. The present invention adopts dynamic separation index control and multi-parameter collaborative optimization, while the prior art uses traditional fixed parameter control. Through these comparative experiments, the performance of the two methods in terms of efficiency, energy consumption and equipment life is comprehensively evaluated, providing a scientific basis for the superiority of the present invention.

[0125] Table 1: Comparison of acid recovery efficiency

[0126]

[0127] As shown in Table 1, the present invention shows higher recovery efficiency when treating waste liquids of different types and concentrations. In particular, for mixed acid waste liquid, the recovery efficiency of the present invention is improved by 10.4%, which is mainly attributed to the introduction of dynamic separation index and multi-parameter coordinated optimization.

[0128] Table 2: Energy consumption comparison

[0129]

[0130] Table 2 shows the energy consumption under different operating time. As the operating time increases, the energy saving effect of the present invention becomes more and more significant, and the energy saving rate reaches 19% after 96 hours of operation. This is due to the intelligent control system based on the dynamic separation index, which can adjust the operating parameters in real time to avoid unnecessary energy loss.

[0131] Table 3: Equipment life comparison

[0132]

[0133] Table 3 shows the service life of key equipment components. The present invention significantly extends the service life of various components, among which the service life of the corrosion-resistant ceramic membrane and the sealing ring is extended by 50%, mainly due to the introduction of vibration parameter control and precise pressure regulation, which reduces the wear and corrosion of the equipment.

[0134] In summary, Tables 1 to 3 fully demonstrate the significant advantages of the present invention in improving acid recovery efficiency, reducing energy consumption and extending equipment life. In particular, when treating complex mixed acid waste liquids, the present invention exhibits stronger adaptability and efficiency. At the same time, as the operating time increases, the advantages of the present invention in energy saving become more obvious, which is of great significance for long-term industrial applications. In addition, the significant improvement in equipment life not only reduces maintenance costs, but also improves the reliability and stability of the entire system. In summary, these theoretical experimental data strongly support the effectiveness and superiority of the present invention.

[0135] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A method for recovering acid from carbon nanotube purification using a ceramic membrane, characterized in that: include: transporting the carbon nanotube purified wastewater to the feed end of the corrosion-resistant ceramic membrane module; The first parameter of the corrosion-resistant ceramic membrane assembly is adjusted to a preset range, and the carbon nanotube purified waste liquid is subjected to diffusion dialysis, so that the acid component in the carbon nanotube purified waste liquid selectively permeates the ceramic membrane in the corrosion-resistant ceramic membrane assembly; real-time monitoring of the concentration of the acid component passing through the ceramic membrane, calculating a dynamic separation index of the acid component according to the concentration, and when the dynamic separation index exceeds a preset threshold, the control system automatically activates an automatic switching system to introduce the acid component into different recovered acid storage tanks; The control system automatically adjusts the delivery rate of the carbon nanotube purification waste liquid and the first parameter according to the dynamic separation index to optimize the recovery efficiency of the acid component; The calculation process of the dynamic separation index includes the following steps: Get the current time t The acid component concentration of the discharge and feed acid component concentration ; Get the current time t Discharge flow and feed flow ; Calculate the ratio of the acid component concentration of the output to the acid component concentration of the feed: ； Calculate the ratio of discharge flow to feed flow: ； Calculate the rate of change of the acid component concentration in the output relative to time: ； Based on the change rate of the acid component concentration of the discharged material relative to time and the preset weight coefficient α Calculate the dynamic adjustment factor: ； in, α is a preset weight coefficient, which is a constant and is used to adjust the influence of the concentration change rate in the calculation of the dynamic separation index; The dynamic separation index DPI is calculated based on the ratio of the acid component concentration of the discharge to the acid component concentration of the feed, the ratio of the discharge flow rate to the feed flow rate, and the dynamic adjustment factor: ； The first parameter includes a pressure parameter and a vibration parameter; the pressure parameter is the feed end pressure, and the vibration parameter is the vibration frequency of the vibration device of the corrosion-resistant ceramic membrane assembly; Adjusting the first parameter of the corrosion-resistant ceramic membrane assembly to a preset range comprises the following steps: The feed end pressure of the corrosion-resistant ceramic membrane assembly is adjusted to an initial value within a preset pressure range, and the initial vibration frequency of the vibration device of the corrosion-resistant ceramic membrane assembly is set; Starting the vibration device to apply micro-vibration of the initial vibration frequency to the ceramic membrane in the corrosion-resistant ceramic membrane assembly; Real-time monitoring of the pressure difference between the two sides of the corrosion-resistant ceramic membrane assembly and the concentration of the acid component that permeates the ceramic membrane; According to the coordinated changes of the pressure difference, the concentration of the acid component and the instantaneous separation efficiency of the acid component, dynamically adjusting the feed end pressure and the vibration frequency through a fuzzy control algorithm until the feed end pressure and the vibration frequency are adjusted to a preset range; According to the coordinated changes of the pressure difference, the concentration of the acid component and the instantaneous separation efficiency of the acid component, the feed end pressure and the vibration frequency are dynamically adjusted by a fuzzy control algorithm until the feed end pressure and the vibration frequency are adjusted to a preset range, comprising the following steps: The pressure difference and the concentration of the acid component are used as input variables, and the input variables are subjected to adaptive fuzzy processing; According to the system response, the fuzzy rule base is dynamically updated: if the pressure difference is greater than the preset allowable error of the system and the concentration of the acid component decreases, the weight of the "adjust feed pressure" rule is increased; if the instantaneous separation efficiency of the acid component decreases and the pressure difference is less than the preset allowable error of the system, the weight of the "adjust vibration frequency" rule is increased; Based on the updated fuzzy rule base, performing multi-objective optimization reasoning on the input variables after the adaptive fuzzification processing; Adaptively defuzzifying the result of the multi-objective optimization reasoning to obtain the adjustment amount of the feed end pressure and the vibration frequency; updating the feed end pressure and vibration frequency according to the adjustment amount; Calculate the deviations of the updated feed end pressure and vibration frequency from their respective target values: if the deviations of both are less than the preset allowable errors of the corresponding systems, keep the current settings; if the deviation of either is greater than or equal to the preset allowable errors of the corresponding systems, take the pressure difference and the concentration of the acid component as input variables, perform adaptive fuzzy processing on the input variables, and continue to adjust; Determine whether the feed end pressure and vibration frequency are stable within their respective preset ranges. Specifically, if the deviations of the feed end pressure and vibration frequency from their respective target values ​​are continuously smaller than the allowable errors preset by the system, and the maintenance time reaches the stabilization time preset by the system, the adjustment is completed; otherwise, repeat the above steps.

2. The method for acid recovery of carbon nanotubes purified by a ceramic membrane according to claim 1, characterized in that: The step of conveying the carbon nanotube purified waste liquid to the feed end of the corrosion-resistant ceramic membrane assembly comprises the following steps: opening the outlet valve of the waste liquid storage tank to allow the carbon nanotube purified waste liquid to enter the feed pipe of the feed system; Starting the acid-resistant pump in the feeding system to pump the carbon nanotube purification waste liquid into the delivery pipeline connected to the feeding end; Opening the liquid inlet valve at the feed end to allow the carbon nanotube purified waste liquid to enter the corrosion-resistant ceramic membrane assembly; The flow rate of the carbon nanotube purified waste liquid is detected by a flow meter; if the detected flow rate is lower than the preset flow lower limit threshold, the acid-resistant pump and all valves are closed, and an alarm signal is issued; if the detected flow rate is higher than the preset flow upper limit threshold, the rotation speed of the acid-resistant pump is reduced; if the detected flow rate is between the preset flow upper limit threshold and the preset flow lower limit threshold, it is confirmed that the carbon nanotube purified waste liquid has successfully entered the feed end of the corrosion-resistant ceramic membrane assembly.

3. The method for acid recovery of carbon nanotubes purified by ceramic membrane according to claim 2, characterized in that: The real-time monitoring of the concentration of the acid component that passes through the ceramic membrane is specifically to continuously collect the concentration of the acid component that passes through the ceramic membrane using a concentration monitoring system, and transmit the data to a control system.

4. The method for acid recovery of carbon nanotubes purified by ceramic membrane according to claim 3, characterized in that: The control system automatically adjusts the delivery rate of the carbon nanotube purified waste liquid and the first parameter of the corrosion-resistant ceramic membrane assembly according to the dynamic separation index, and includes the following steps: The control system calculates the rate of change of the dynamic separation index and compares it with a rate of change threshold; If the rate of change of the dynamic separation index is positive and greater than the rate of change threshold, the control system sends an instruction to the feeding system to increase the delivery rate of the carbon nanotube purified waste liquid, and at the same time sends an instruction to the pressure regulating system to reduce the vibration frequency of the corrosion-resistant ceramic membrane assembly; if the rate of change of the dynamic separation index is negative and the absolute value is greater than the rate of change threshold, the control system sends an instruction to the feeding system to reduce the delivery rate of the carbon nanotube purified waste liquid, and at the same time sends an instruction to the pressure regulating system to increase the vibration frequency of the corrosion-resistant ceramic membrane assembly; The control system calculates the required feed end pressure based on the adjusted delivery rate; if the difference between the calculated feed end pressure and the current feed end pressure is greater than the preset pressure adjustment threshold, the control system sends a command to the pressure regulation system to adjust the feed end pressure to the calculated value.

5. The method for acid recovery of carbon nanotubes purified by ceramic membrane according to claim 4, characterized in that: The carbon nanotube purification waste liquid contains strong acid or mixed acid.

6. An acid recovery system for purifying carbon nanotubes using a ceramic membrane, based on the method for purifying carbon nanotubes using a ceramic membrane according to any one of claims 1 to 5, characterized in that: include, The corrosion-resistant ceramic membrane assembly is used to perform diffusion dialysis on the carbon nanotube purified waste liquid, so that the acid components in the carbon nanotube purified waste liquid selectively permeate through the ceramic membrane inside it; A waste liquid storage tank, used for storing carbon nanotube purification waste liquid containing strong acid or mixed acid; A feeding system, used for conveying the carbon nanotube purification waste liquid from the waste liquid storage tank to the feeding end of the corrosion-resistant ceramic membrane module; A pressure regulating system, used for adjusting a first parameter of the corrosion-resistant ceramic membrane assembly to a preset range; Concentration monitoring system, used to monitor the concentration of acid components passing through the ceramic membrane in real time; A control system, used for automatically activating the automatic switching system according to the concentration of the acid component provided by the concentration monitoring system, and sending adjustment instructions to the feeding system and the pressure regulating system to optimize the recovery efficiency of the acid component; An automatic switching system for directing acid components into different recovered acid storage tanks when the acid component concentration reaches a preset threshold; The recovered acid storage tank is used to store recovered acid of different concentrations.

7. A computer device comprising a memory and a processor, wherein the memory stores a computer program, characterized in that: When the processor executes the computer program, the steps of the method for acid recovery for purifying carbon nanotubes using a ceramic membrane according to any one of claims 1 to 5 are implemented.

8. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the method for acid recovery for purifying carbon nanotubes using a ceramic membrane according to any one of claims 1 to 5 are implemented.

Images