Efficient desalting and refining equipment and method for tripentaerythritol

Abstract

The invention relates to the technical field of purification of tripentaerythritol, and discloses efficient desalting and refining equipment for tripentaerythritol, which comprises a pulsed electric field electrodialysis module for desalting mother liquor containing tripentaerythritol to obtain desalted feed liquid; the ultrasonic induced crystallization module is connected with a liquid outlet of the pulsed electric field electrodialysis module and is used for receiving the desalted material liquid, selectively inducing tripentaerythritol to crystallize and separate out by applying ultrasonic waves and separating the tripentaerythritol separated out by crystallization at the same time; and the online sensor array is arranged between the pulsed electric field electrodialysis module and the ultrasonic induced crystallization module and is used for detecting physical and chemical parameters of the desalted feed liquid. Through a cooperative working mechanism of a sound field and a pulsed electric field in the desalting module, continuous high flux and separation performance of the ion exchange membrane under harsh working conditions are ensured, and the technical bottleneck when a traditional electrodialysis technology is applied to high-viscosity and high-organic-matter-content feed liquid is fundamentally overcome.

Description

Technical Field

[0001] The present invention relates to the technical field of tripentaerythritol purification, in particular to a device and method for efficiently desalting and refining tripentaerythritol. Background Art

[0002] Currently, the purification of tripentaerythritol from mother liquor containing high concentrations of sodium formate and various pentaerythritol homologues mainly relies on traditional separation methods such as evaporation and cooling crystallization. These methods have the following shortcomings: First, the process of removing large amounts of water by evaporation and recovering salt by crystallization consumes a lot of energy and has a long treatment cycle. Second, in high-salt and high-viscosity systems, the crystallization processes of tripentaerythritol and sodium formate interfere with each other, resulting in incomplete desalination, and the product is prone to carry salt and has low purity. Furthermore, the physical and chemical properties of dipentaerythritol and tripentaerythritol are similar, making it difficult to achieve efficient selective separation through conventional cooling crystallization, which affects product yield and quality. Summary of the Invention

[0003] In view of the deficiencies in the prior art, the present invention provides a highly efficient desalting and refining device and method for tripentaerythritol, which solves the problem.

[0004] To achieve the above object, the present invention is implemented by the following technical solution: a high-efficiency desalting and refining device for tripentaerythritol, comprising: The pulsed electric field electrodialysis module is used to desalinate the mother liquor containing tripentaerythritol to obtain a desalted feed solution; an ultrasonically induced crystallization module connected to the liquid outlet of the pulsed electric field electrodialysis module, configured to receive the desalted feed solution, selectively induce crystallization of tripentaerythritol by applying ultrasonic waves, and simultaneously separate the crystallized tripentaerythritol; An online sensor array, disposed between the pulsed electric field electrodialysis module and the ultrasonic induced crystallization module, for detecting the physical and chemical parameters of the desalted liquid; A central control system is electrically connected to the online sensor array and the ultrasonic induced crystallization module, and is used to dynamically adjust the working parameters of the ultrasonic waves applied by the ultrasonic induced crystallization module according to the detected physical and chemical parameters.

[0005] Preferably, the main structure of the pulsed electric field electrodialysis module is an electrodialysis membrane stack, which is composed of alternatingly stacked cation exchange membranes and anion exchange membranes, and a plurality of independent flow chambers are formed between the two, which are respectively a fresh water chamber for accommodating the liquid to be treated and a concentrated water chamber for collecting the migrated salt. Anodes and cathodes are provided at both ends of the membrane stack and are connected to a pulsed DC power supply.

[0006] Preferably, a piezoelectric ceramic acoustic transducer array is integrated and embedded on the non-membrane side wall inside the desalination chamber, which is used to apply ultrasonic waves of specific frequency and energy to the feed liquid in the desalination chamber and is also electrically connected to the central control system.

[0007] Preferably, the ultrasonic induced crystallization module includes two continuous crystallizers connected in series, the input end of the upstream continuous crystallizer is connected to the desalting liquid outlet of the electrodialysis membrane stack, and an ultrasonic probe is immersed in the interior of each continuous crystallizer. The ultrasonic probe is connected to an ultrasonic generator that supports dynamic parameter adjustment, and according to the instructions of the central control system, the key parameters of the ultrasonic output, such as the working frequency, power and pulse duty cycle, are adjusted in real time.

[0008] Preferably, the online sensor array includes a residual conductivity sensor, a dynamic viscosity sensor and a turbidity sensor, which are used to continuously monitor various key physical and chemical parameters of the desalted liquid flowing out of the pulsed electric field electrodialysis module.

[0009] Based on the above-mentioned tripentaerythritol high-efficiency desalination and refining equipment, the present invention also provides a tripentaerythritol high-efficiency desalination and refining method, comprising the following steps: Step 1: Desalting the mother liquor containing tripentaerythritol using a pulsed electric field electrodialysis module to obtain a desalted feed solution; Step 2: feeding the desalted feed solution into an ultrasonic induced crystallization module, and applying ultrasonic waves at a preset temperature to selectively induce crystallization of tripentaerythritol; Step 3: performing solid-liquid separation on the crystallized tripentaerythritol.

[0010] Preferably, the step of using a pulsed electric field electrodialysis module for desalination treatment also includes: applying ultrasound in the fresh water chamber of the pulsed electric field electrodialysis module, wherein the ultrasound and the pulsed electric field act synergistically to inhibit membrane fouling of the cation exchange membrane and the anion exchange membrane.

[0011] Preferably, the synergistic effect of the ultrasonic wave and the pulse electric field is specifically as follows: ultrasonic waves with different working parameters are applied during the electric field on phase and the electric field off phase of the pulse electric field.

[0012] Preferably, before the desalted feed solution is fed into the ultrasonic induced crystallization module, the process further comprises the following steps: Online detection of the physical and chemical parameters of the desalted liquid; And according to the physical and chemical parameters, the working parameters of the ultrasonic wave applied in the ultrasonic induced crystallization module are dynamically adjusted.

[0013] Preferably, the physicochemical parameters include residual conductivity, dynamic viscosity and turbidity.

[0014] The present invention provides a highly efficient desalting and refining device and method for tripentaerythritol, which has the following beneficial effects: 1. The present invention achieves stable and thorough desalination in high-viscosity organic systems. This is achieved thanks to the collaborative working mechanism of the acoustic field and the pulsed electric field within the desalination module. The pulsed electric field provides a periodic "relaxation" window for the ion exchange membrane during the "on-off" switching. During this window, the ultrasonic waves applied simultaneously can instantly and physically remove and renew the organic contamination layer that may form on the membrane surface, ensuring the ion exchange membrane's continued high flux and separation performance under harsh operating conditions. This fundamentally overcomes the technical bottleneck of traditional electrodialysis technology when applied to such high-viscosity, high-organic content feed solutions.

[0015] 2. This invention addresses the inherent challenge of separating dipentaerythritol and tripentaerythritol due to their similar physicochemical properties, providing a precise molecular discrimination method. Rather than relying on single temperature control, the system utilizes an online sensor array to provide real-time insights into subtle changes in the residual ion environment and viscosity within the desalted liquid. Based on this information, the downstream ultrasonic wave is transformed from a fixed "facilitator" to a dynamically tunable "induction tool." This acoustic field energy, tailored to the current liquid state, selectively triggers tripentaerythritol nucleation, thereby achieving efficient separation of highly structurally similar homologues.

[0016] 3. This invention integrates multiple independent, time-consuming batch operations into a compact, streamlined, continuous production process. By replacing traditional large-scale evaporation with non-thermal electrodialysis desalination and replacing lengthy static settling and repeated cooling crystallization with efficient induced crystallization, the conversion cycle from mother liquor to finished product is significantly shortened. This not only increases the equipment's processing capacity per unit time but also makes control of the entire production process more centralized and convenient.

[0017] 4. The present invention efficiently removes the vast majority of inorganic salts before crystallization, creating a pure precipitation environment for tripentaerythritol crystallization. Consequently, the problems of salt entrainment and surface adhesion within the resulting crystals are fundamentally improved, resulting in a high initial product purity. This advantage significantly simplifies or even eliminates any subsequent purification steps that may be required, not only reducing refining costs but, more importantly, avoiding target product loss caused by repeated dissolution and recrystallization operations, helping to ensure the final product yield.

[0018] 5. This invention demonstrates excellent adaptability to raw material fluctuations and process self-regulation. To address potential differences in composition and viscosity between mother liquor batches under different production cycles or operating conditions, the device's built-in online sensing and coordinated control system form its intelligent core. It proactively identifies these variations and automatically adjusts the operating parameters of the core units (electrodialysis and crystallization) to compensate, rather than passively accepting the impact of raw material fluctuations. This feature ensures stable final product quality and predictable production processes, enhancing process robustness. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a three-dimensional schematic diagram of a high-efficiency desalting and refining device for tripentaerythritol according to the present invention; Figure 2 Schematic diagram of the structure of the electrodialysis membrane stack in the present invention; Figure 3 This is a step diagram of a method for efficiently desalting and refining tripentaerythritol according to the present invention; Figure 4 It is a system flow chart of the present invention.

[0020] Among them, 1. Electrodialysis membrane stack; 101. Cation exchange membrane; 102. Anion exchange membrane; 103. Fresh water chamber; 104. Concentrated water chamber; 105. Anode; 106. Cathode; 2. Continuous crystallizer; 3. Online sensor array. DETAILED DESCRIPTION

[0021] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0022] Example 1: Please see the attached Figure 1 -Attached Figure 2 The embodiment of the present invention provides a tripentaerythritol efficient desalting and refining device, comprising: The pulsed electric field electrodialysis module is used to desalinate a mother liquor containing tripentaerythritol to obtain a desalted feed solution. Its main structure is an electrodialysis membrane stack 1, which is composed of alternatingly stacked cation exchange membranes 101 and anion exchange membranes 102, with multiple independent flow chambers formed between the two, namely a fresh water chamber 103 for accommodating the feed solution to be treated and a concentrated water chamber 104 for collecting migrated salt. An anode 105 and a cathode 106 are provided at both ends of the membrane stack and are connected to a pulsed DC power supply. A piezoelectric ceramic acoustic wave transducer array is integrated and embedded on the non-membrane side wall inside the fresh water chamber 103, which is used to apply ultrasonic waves of a specific frequency and energy to the feed solution in the fresh water chamber 103. The transducer array is also electrically connected to a central control system. The ultrasonic induced crystallization module is connected to the liquid outlet of the pulsed electric field electrodialysis module, and is used to receive the desalinated feed solution and selectively induce the crystallization of tripentaerythritol by applying ultrasonic waves, while separating the crystallized tripentaerythritol. The ultrasonic induced crystallization module includes two continuous crystallizers 2 connected in series, with the input end of the upstream continuous crystallizer 2 connected to the desalinated feed liquid outlet of the electrodialysis membrane stack. An ultrasonic probe is immersed in each continuous crystallizer 2 and is connected to an ultrasonic generator that supports dynamic parameter adjustment. According to the instructions of the central control system, the ultrasonic operating frequency, power, pulse duty cycle and other key parameters of the ultrasonic output are adjusted in real time. The online sensor array 3 is arranged between the pulsed electric field electrodialysis module and the ultrasonic induced crystallization module, and includes a residual conductivity sensor, a dynamic viscosity sensor, and a turbidity sensor, which are used to detect the physical and chemical parameters of the desalted liquid; The central control system is electrically connected to the online sensor array 3 and the ultrasonic induced crystallization module, and is used to dynamically adjust the working parameters of the ultrasonic wave applied by the ultrasonic induced crystallization module according to the detected physical and chemical parameters.

[0023] The equipment provided by this invention is an integrated, continuously operational system for processing mother liquor containing tripentaerythritol. The system's overall layout divides the material processing process into several modules with distinct functions. These modules are sequentially connected through fluid transport components such as pipelines, pumps, and valves, and operate in coordination under the unified scheduling of a central control system (DCS). Material enters the system from a raw material inlet, flows sequentially through each processing module, and ultimately, high-purity tripentaerythritol is obtained from the product outlet. Other components are also effectively separated and recovered, forming an efficient, closed-loop process.

[0024] The pulsed electric field electrodialysis module is the unit used to perform the core desalination step of the present invention. Its main structure consists of an electrodialysis membrane stack 1, which is composed of alternating cation exchange membranes 101 (e.g., perfluorosulfonic acid type) and anion exchange membranes 102 (e.g., quaternary ammonium type). Between these two stacks are formed multiple independent, thin-layer flow chambers: a freshwater chamber 103 for holding the treated liquid and a concentrated water chamber 104 for collecting the migrated salt. An anode 105 and cathode 106 made of an inert metal (e.g., titanium-coated ruthenium-iridium) are located at either end of the stack and connected to a pulsed DC power supply capable of outputting a stable pulse waveform (e.g., a square wave). The key feature of this module lies in the integration, embedding, or mounting of a piezoelectric ceramic acoustic transducer array on the non-membrane sidewalls of each freshwater chamber 103 (i.e., the area outside the cation exchange membranes 101 and anion exchange membranes 102). The piezoelectric ceramic acoustic transducers are treated with a chemically inert coating and hermetically sealed to prevent corrosion from the liquid. These transducers are designed to apply ultrasonic waves of specific frequency and energy to the liquid in the desalted water chamber 103 and are also connected to the central control system to achieve precise synchronization of their working state and the pulsed electric field.

[0025] The ultrasonic-induced crystallization module is used to perform selective crystallization separation of tripentaerythritol. It adopts a cascade design and includes at least two continuous crystallizers 2 connected in series with precise temperature control jackets. The purpose of this cascade arrangement is to preferentially separate tripentaerythritol in the first-stage continuous crystallizer 2, while the second-stage continuous crystallizer 2 can be used to separate the remaining dipentaerythritol in the mother liquor. Each continuous crystallizer 2 is equipped with a precise temperature control jacket on the outside. By circulating a heat-conducting medium, the temperature of the internal liquid can be stably maintained at a preset target value with controllable accuracy. An ultrasonic probe is immersed in the interior of each continuous crystallizer 2. The probe is connected to an ultrasonic generator that supports dynamic parameter adjustment. It can adjust key parameters such as the ultrasonic operating frequency, power, and pulse duty cycle of its output in real time according to the instructions of the central control system, thereby achieving fine-grained control of the crystallization process.

[0026] A compact, flow-through-cell-style online sensor array3 is installed in the connecting pipe between the outlet of the pulsed electric field electrodialysis module and the inlet of the ultrasonic-induced crystallization module. This array, the sensing foundation for intelligent system control, integrates at least one four-electrode residual conductivity sensor, a dynamic viscosity sensor based on vibration or torque principles, and an optical turbidity sensor. These sensors continuously monitor key physical and chemical parameters of the desalination solution flowing from the desalination module and convert the signals into standard electrical outputs.

[0027] The entire facility's operation is centrally managed by a central control system (DCS). This system not only receives real-time data streams from the online sensor array 3 via electrical connections but also establishes bidirectional communication and closed-loop control with all actuators, including the pulsed electric field electrodialysis module's pulse power supply and internal ultrasonic transducer, and the ultrasonic-induced crystallization module's temperature-controlled jacket and internal ultrasonic probe. Acting as an intelligent hub, it coordinates the operations of each module based on a pre-programmed collaborative control algorithm model and real-time material status data, ensuring the automation, precision, and efficiency of the entire refining process.

[0028] Example 2: Please see the attached Figure 3 -Attached Figure 4 Based on the above embodiment, the present invention provides a method for efficiently desalting and refining tripentaerythritol, comprising the following steps: Step 1: Online detection of the physical and chemical parameters of the desalted liquid; Dynamically adjusting the working parameters of the ultrasonic wave applied in the ultrasonic induced crystallization module according to the physicochemical parameters, including residual conductivity, dynamic viscosity and turbidity; Step 2: Desalting the mother liquor containing tripentaerythritol using a pulsed electric field electrodialysis module to obtain a desalted feed solution, wherein ultrasonic waves are applied in the fresh water chamber (103) of the pulsed electric field electrodialysis module, and the ultrasonic waves and the pulsed electric field act synergistically to inhibit membrane fouling of the cation exchange membrane (101) and the anion exchange membrane (102); the synergistic effect of the ultrasonic waves and the pulsed electric field is specifically as follows: ultrasonic waves with different working parameters are applied in the electric field on stage and the electric field off stage of the pulsed electric field; Step 3: feeding the desalted feed liquid into an ultrasonic induced crystallization module, and applying ultrasonic waves at a preset temperature to selectively induce crystallization of tripentaerythritol; Step 4: performing solid-liquid separation on the crystallized tripentaerythritol.

[0029] This embodiment is based on a highly efficient desalination and refining device for tripentaerythritol and provides a working method and process for the refining device. The core of the embodiment lies in the deep coupling of multiple physical fields and adaptive regulation based on real-time feedback. The specific technical principles and operating steps are described below.

[0030] During the desalination step, the present invention reveals a unique mechanism for combating membrane fouling through the synergistic effect of acoustic and electric fields. As the mother liquor containing tripentaerythritol flows through the desalination chamber 103, a central control system precisely coordinates the electrodes and ultrasonic transducers in a time series. During the "electric field on" phase of the pulsed electric field, the electric field forces drive the inorganic salt ions in the slurry to migrate across the ion exchange membrane at high speeds. Simultaneously, the ultrasonic transducer within the desalination chamber 103 operates in a low-power, continuous mode, generating gentle, high-frequency vibrations that form a layer of continuously disturbed acoustic microflows on the membrane surface. This layer of microflows effectively prevents organic macromolecules from approaching and depositing on the membrane surface under the secondary effect of electrical migration forces, thereby suppressing fouling at its earliest stages.

[0031] Next, during the "field off" phase of the pulsed electric field, ion migration is suspended, and concentration polarization on the membrane surface is alleviated. At this moment, the central control system instructs the ultrasonic transducer to switch to high-power, pulsed mode. The instantaneous release of powerful acoustic energy produces a strong cavitation effect and acoustic jet near the membrane. This physical force is sufficient to actively and non-destructively remove organic contaminants that may have been weakly adsorbed on the membrane surface during the previous cycle, resuspending them in the main feed solution and allowing them to flow away. This alternating "migration-cleaning" cycle constitutes an in-situ dynamic self-cleaning process on the membrane surface, thereby ensuring the long-term efficiency and stability of the desalination operation.

[0032] The state of the desalted liquid flowing out of the desalination module before entering the crystallization unit is the key to achieving the final high-selectivity separation. Therefore, the present invention provides an intelligent control step. When the desalted liquid flows through the online sensor array 3, its residual conductivity, dynamic viscosity and turbidity are collected in real time and continuously. These parameters together constitute a multi-dimensional data fingerprint that can accurately characterize the physical and chemical properties of the current liquid. After receiving this set of fingerprint data, the central control system will immediately call its built-in algorithm model for calculation. The model pre-establishes a nonlinear mapping relationship between the liquid fingerprint and the optimal ultrasonic-induced nucleation parameters (including frequency, power, pulse duty cycle, etc.). The result of the calculation is to dynamically generate a set of exclusive and optimized ultrasonic working parameter instructions for the current state of the liquid.

[0033] During the selective crystallization step, the desalted liquid carrying this instruction enters the first-stage in-line sensor array 3. The temperature of in-line sensor array 3 is precisely controlled within the metastable zone of tripentaerythritol, creating a thermodynamic state where spontaneous nucleation is difficult but highly sensitive to external energy perturbations. During this time, the ultrasonic probes within in-line sensor array 3 operate strictly according to customized parameter instructions issued by the central control system. This "tailor-made" acoustic field energy, with its intensity and frequency precisely designed to precisely match the requirements for tripentaerythritol molecules to aggregate and overcome the nucleation energy barrier, selectively and massively induces its preferential nucleation and growth. Due to subtle differences in its molecular structure and solvation state, dipentaerythritol requires a different energy threshold for nucleation than tripentaerythritol. Therefore, under these specific acoustic field parameters, it is not significantly induced, and the vast majority remains dissolved in the mother liquor. This constitutes the core mechanism for the precise separation of the two.

[0034] In summary, the complete continuous operation process of the present invention is as follows: the high-salt, high-viscosity mother liquor to be treated first enters the acoustic-electrically coupled pulse electrodialysis module, where the majority of inorganic salts are efficiently and stably removed under the synergistic effect of acoustics and electricity. The desalted liquid then flows through the online sensor array 3, where its state is captured in real time, and the optimal crystallization acoustic field parameters are calculated by the central control system. The liquid carrying these parameter instructions enters the first-stage crystallizer. Under the combined action of precise temperature control and customized ultrasonic waves, tripentaerythritol is selectively induced to crystallize and precipitate. It is immediately separated and collected by the downstream solid-liquid separation unit to obtain a high-purity product. The separated mother liquor (now rich in dipentaerythritol) continues to enter the second-stage online sensor array 3. By adjusting the process parameters, dipentaerythritol is recovered. Finally, the remaining liquid and concentrated brine are returned to the front end of the process, achieving a closed-loop cycle for the entire process and maximizing the value of the materials.

[0035] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A highly efficient desalting and refining equipment for tripentaerythritol, characterized in that: include: Pulsed electric field electrodialysis module, used to desalinate the mother liquor containing tripentaerythritol to obtain a desalted feed solution; An ultrasonically induced crystallization module connected to the liquid outlet of the pulsed electric field electrodialysis module for receiving the desalted liquid and selectively inducing crystallization of tripentaerythritol by applying ultrasonic waves, while separating the crystallized tripentaerythritol; An online sensor array (3) is arranged between the pulsed electric field electrodialysis module and the ultrasonic induced crystallization module, and is used to detect the physical and chemical parameters of the desalted liquid; A central control system is electrically connected to the online sensor array (3) and the ultrasonic induced crystallization module, and is used to dynamically adjust the working parameters of the ultrasonic wave applied by the ultrasonic induced crystallization module according to the detected physical and chemical parameters.

2. The efficient desalination and refining equipment for tripentaerythritol according to claim 1, characterized in that: The main structure of the pulsed electric field electrodialysis module is an electrodialysis membrane stack (1), which is composed of cation exchange membranes (101) and anion exchange membranes (102) that are alternately stacked and arranged, and a plurality of independent flow chambers are formed between the two, namely, a fresh water chamber (103) for accommodating the liquid to be treated and a concentrated water chamber (104) for collecting the migrated salt. An anode (105) and a cathode (106) are provided at both ends of the membrane stack and are connected to a pulsed DC power supply.

3. The efficient desalting and refining equipment for tripentaerythritol according to claim 2, characterized in that: A piezoelectric ceramic acoustic transducer array is integrated and embedded on the non-membrane side wall inside the desalted water chamber (103), which is used to apply ultrasonic waves of specific frequency and energy to the liquid in the desalted water chamber (103) and is also electrically connected to the central control system.

4. The efficient desalting and refining equipment for tripentaerythritol according to claim 2, characterized in that: The ultrasonic induced crystallization module comprises two continuous crystallizers (2) connected in series, the input end of the upstream continuous crystallizer (2) is connected to the desalination liquid outlet of the electrodialysis membrane stack (1), and an ultrasonic probe is immersed in the interior of each continuous crystallizer (2). The ultrasonic probe is connected to an ultrasonic generator that supports dynamic parameter adjustment, and key parameters such as the ultrasonic working frequency, power and pulse duty cycle of the ultrasonic output are adjusted in real time according to the instructions of the central control system.

5. The efficient desalting and refining equipment for tripentaerythritol according to claim 1, characterized in that: The online sensor array (3) includes a residual conductivity sensor, a dynamic viscosity sensor and a turbidity sensor, which are used to continuously monitor the key physical and chemical parameters of the desalination liquid flowing out of the pulsed electric field electrodialysis module.

6. A method for efficiently desalting and refining tripentaerythritol, characterized in that: The following steps are involved: Step 1: Desalting the mother liquor containing tripentaerythritol using a pulsed electric field electrodialysis module to obtain a desalted feed solution; Step 2: feeding the desalted feed solution into an ultrasonic induced crystallization module, and applying ultrasonic waves at a preset temperature to selectively induce crystallization of tripentaerythritol; Step 3: performing solid-liquid separation on the crystallized tripentaerythritol.

7. The method for efficiently desalting and refining tripentaerythritol according to claim 6, wherein: The step of using a pulsed electric field electrodialysis module for desalination treatment also includes: applying ultrasonic waves in the fresh water chamber (103) of the pulsed electric field electrodialysis module, wherein the ultrasonic waves and the pulsed electric field act synergistically to suppress membrane fouling of the cation exchange membrane (101) and the anion exchange membrane (102).

8. The method for efficiently desalting and refining tripentaerythritol according to claim 7, wherein: The synergistic effect of the ultrasonic wave and the pulse electric field is specifically as follows: ultrasonic waves with different working parameters are applied during the electric field on stage and the electric field off stage of the pulse electric field.

9. The method for efficiently desalting and refining tripentaerythritol according to claim 6, wherein: Before the desalted liquid is fed into the ultrasonic induced crystallization module, the method further comprises the following steps: Online detection of the physical and chemical parameters of the desalted liquid; And according to the physical and chemical parameters, the working parameters of the ultrasonic wave applied in the ultrasonic induced crystallization module are dynamically adjusted.

10. The method for efficiently desalting and refining tripentaerythritol according to claim 9, wherein: The physicochemical parameters include residual conductivity, dynamic viscosity and turbidity.

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