Hydration catalyst washing and filtering system capable of preventing ceramic filter element from being damaged

Abstract

The utility model discloses a hydration catalyst washing and filtering system capable of preventing a ceramic filter element from being damaged, which comprises a regeneration washing tank, a catalyst washing filter, a high-purity water heat exchanger and the like, an outlet of the regeneration washing tank is connected with the top of the catalyst washing filter through a pipeline, and the filtered hydration catalyst comes out from the bottom of the catalyst washing filter. The high-purity water outlet is connected with a tube pass inlet of the high-purity water heat exchanger through a pipeline, a tube pass outlet of the high-purity water heat exchanger is connected with an inlet in the side face of the catalyst filter through a pipeline, and low-temperature condensate water is introduced into a shell pass inlet of the high-purity water heat exchanger. According to the utility model, low-temperature condensate water and backwashing high-purity water are subjected to heat exchange, and the temperature difference between hydration catalyst slurry in the ceramic filter element and the high-purity water is reduced by increasing the temperature of the high-purity water, so that the ceramic filter element is effectively prevented from being broken due to interaction of cold and hot materials, and safe and stable operation of hydration catalyst regeneration system equipment is realized.

Description

Technical Field

[0001] This utility model belongs to the field of catalyst regeneration and condensate energy-saving optimization and transformation, specifically involving a hydrated catalyst water washing filtration system to prevent damage to ceramic filter elements. Background Technology

[0002] In chemical production, catalysts are used in over 90% of processes. Catalysts accelerate reaction rates, reduce energy requirements, improve production efficiency, increase reaction selectivity, and reduce side reactions. However, due to various factors, they can rapidly or slowly lose activity during use. The hydrated catalyst used in cyclohexanol production is a key material in the synthesis process. To ensure the activity of the hydrated catalyst, it needs to be regenerated. First, a portion of the hydrated catalyst slurry from the hydrated reaction system is discharged into a hydrated catalyst regeneration tank. After regeneration processes such as oil removal, activation, cleaning, and filtration, it is returned to the hydrated reactor from the hydrated catalyst storage tank. The regeneration operation process includes: ① Discharge operation (catalyst receiving): Part of the catalyst slurry in the hydrated reactor is discharged into the regeneration tank, with the liquid level controlled at 60% capacity. ② Oil removal operation: The catalyst slurry and dissolved oil phase are desorbed by low-pressure steam purging, and the condensate oil phase is removed through a separation tank. ③ Activation operation (hydrogen peroxide treatment). The hydrated catalyst is oxidized with hydrogen peroxide to further decompose and remove organic matter adhering to the catalyst at a temperature of 90 ℃. ④ Washing (filtration): The filter is washed with high-purity water to remove residual organic oxides from the surface of the hydrogen peroxide-treated hydrated catalyst. Washing is stopped when the pH of the filtrate reaches 4.5 or higher. ⑤ Transfer: The regenerated hydrated catalyst slurry is transferred to the catalyst storage tank. ⑥ Return: The regenerated catalyst slurry in the catalyst storage tank is pumped back into the hydrated reactor.

[0003] In the cleaning and filtration process of the hydrated catalyst regeneration process, lotus root-shaped ceramic filter elements are used for filtration. Backwashing is required during regeneration, using high-purity water to rinse the catalyst filter and prevent catalyst adhesion, which could cause clogging and shorten its lifespan. During this process, the temperature of the hydrated catalyst slurry is 80–90°C, while the temperature of the high-purity water is only around 30°C. The ceramic filter elements are subjected to a sudden temperature difference of nearly 60°C during the washing process. This sudden cooling under expansion conditions can cause some ceramic filter elements to rupture, leading to hydrated catalyst loss and severe pollution of the external drainage. Previous methods lowered the temperature of the hydrated catalyst slurry to 60°C before washing to reduce the temperature difference between the hydrated catalyst slurry and the high-purity water in the ceramic filter element. However, lowering the washing temperature is not conducive to removing impurities adhering to the surface of the hydrated catalyst. Therefore, this application proposes increasing the temperature of the high-purity water to reduce the temperature difference between the hydrated catalyst slurry and the high-purity water in the ceramic filter element, effectively preventing the rupture of the ceramic filter element and achieving safe and stable long-term operation of the hydrated catalyst regeneration system. Utility Model Content

[0004] The purpose of this invention is to address the problems mentioned above by providing a hydration catalyst washing filtration system that prevents ceramic filter element breakage. It employs heat recovery technology to recover and reuse the heat from the low-temperature condensate, increasing the temperature of the backwash high-purity water. By increasing the temperature of the high-purity water, the temperature difference between the hydration catalyst slurry and the high-purity water in the ceramic filter element is reduced, effectively preventing ceramic filter element breakage caused by the interaction of hot and cold materials. This ensures safe and stable long-term operation of the hydration catalyst regeneration system.

[0005] To achieve the above objectives, the specific solution adopted by this utility model is as follows:

[0006] A hydrated catalyst washing filtration system for preventing ceramic filter element damage includes a regeneration water washing tank, several catalyst washing filters, and a high-purity water heat exchanger. The outlet of the regeneration water washing tank is connected to the top of the first catalyst washing filter via a pipe. The several catalyst washing filters are connected in series. The bottom outlet of the last catalyst washing filter is connected to the regeneration water washing tank, so that the filtered hydrated catalyst returns to the regeneration water washing tank after exiting from the bottom of the last catalyst washing filter. The tube-side inlet of the high-purity water heat exchanger is connected to a high-purity water pipe, and the tube-side outlet of the high-purity water heat exchanger is connected to the side inlet of each catalyst washing filter via a pipe. The shell-side inlet of the high-purity water heat exchanger is connected to a low-temperature condensate pipe, and the shell-side outlet is connected to a low-temperature condensate network via a pipe.

[0007] Furthermore, the plurality of catalyst washing filters include a first, a second, and a third catalyst washing filter, and the first, second, and third catalyst washing filters have the same internal structure, consisting of a lotus root-shaped ceramic filter element.

[0008] Furthermore, each catalyst washing filter has an inlet at the bottom and an outlet at the top, allowing high-purity water to backwash the hydrated catalyst. The outlet is connected to a wastewater pipe, which is equipped with a catalyst washing filter wastewater discharge valve.

[0009] Furthermore, a high-purity water backwash valve for the catalyst washing filter is installed on the pipe between the tube outlet of the high-purity water heat exchanger and each catalyst washing filter.

[0010] Furthermore, the first, second, and third catalyst water washing filters can be automatically backwashed, and can also be manually operated in case of abnormalities.

[0011] Furthermore, the high-purity water heat exchanger is either a tubular heat exchanger or a plate heat exchanger, with a plate heat exchanger being preferred due to its small size and ease of disassembly.

[0012] This invention employs heat recovery technology to recover and reuse the heat from low-temperature condensate, thereby increasing the temperature of the backwash high-purity water. By increasing the temperature of the high-purity water, the temperature difference between the hydrated catalyst slurry and the high-purity water in the ceramic filter element is reduced, effectively preventing the ceramic filter element from cracking due to the interaction of hot and cold materials, and enabling the hydrated catalyst regeneration system to operate safely and stably for a long period of time. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of this utility model.

[0014] In the diagram: 1. Regenerated water washing tank; 2. First catalyst washing filter; 3. Second catalyst washing filter; 4. Third catalyst washing filter; 5. High-purity water heat exchanger; 21. Wastewater discharge valve of the first catalyst washing filter; 22. High-purity water backwash valve of the first catalyst washing filter; 31. Wastewater discharge valve of the second catalyst washing filter; 32. High-purity water backwash valve of the second catalyst washing filter; 41. Wastewater discharge valve of the third catalyst washing filter; 42. High-purity water backwash valve of the third catalyst washing filter. Detailed Implementation

[0015] The present invention will be further described below with reference to the accompanying drawings.

[0016] Example 1

[0017] A hydrated catalyst water washing filtration system to prevent damage to ceramic filter elements, such as Figure 1As shown, the system includes a regeneration water washing tank 1, a first catalyst washing filter 2, a second catalyst washing filter 3, a third catalyst washing filter 4, and a high-purity water heat exchanger 5. The first catalyst washing filters 2, 3, and 4 have identical internal structures, composed of lotus root-shaped ceramic filter elements. Each of the first catalyst washing filters 2, 3, and 4 has an inlet at the lower part of its side and an outlet at the upper part. The outlet is connected to a wastewater pipe. The wastewater pipe of the first catalyst washing filter 2 is equipped with a first catalyst washing filter wastewater discharge valve 21; the wastewater pipe of the second catalyst washing filter 3 is equipped with a second catalyst washing filter wastewater discharge valve 31; and the wastewater pipe of the third catalyst washing filter 4 is equipped with a third catalyst washing filter wastewater discharge valve 41.

[0018] The tube-side inlet of the high-purity water heat exchanger 5 is connected to a high-purity water pipeline. The tube-side outlet of the high-purity water heat exchanger 5 is connected to the side inlets of the first catalyst water washing filter 2, the second catalyst water washing filter 3, and the third catalyst water washing filter 4 via pipelines. A high-purity water backwash valve 22 for the first catalyst water washing filter is installed on the connecting pipeline between the high-purity water heat exchanger 5 and the first catalyst water washing filter 2. A high-purity water backwash valve 32 for the second catalyst water washing filter is installed on the connecting pipeline between the high-purity water heat exchanger 5 and the second catalyst water washing filter 3. A high-purity water backwash valve 42 for the third catalyst water washing filter is installed on the connecting pipeline between the high-purity water heat exchanger 5 and the third catalyst water washing filter 4. A low-temperature condensate pipeline is connected to the shell-side inlet of the high-purity water heat exchanger 5, and the shell-side outlet is connected to the low-temperature condensate pipeline network via a pipeline.

[0019] In use, the hydrated catalyst, which has been treated with hydrogen peroxide, enters the first catalyst washing filter 2 from the top of the regeneration water washing tank 1 for filtration. Then, it exits from the bottom of the first catalyst washing filter 2 and enters the top of the second catalyst washing filter 3 for filtration. Subsequently, it exits from the bottom of the second catalyst washing filter 3 and enters the top of the third catalyst washing filter 4 for filtration. Finally, it exits from the bottom of the third catalyst washing filter 4 and returns to the regeneration water washing tank 1. The hydrated catalyst flows inside the ceramic filter element, and impurities on the hydrated catalyst are filtered out from the upper part of the first catalyst washing filter 2, the second catalyst washing filter 3, and the third catalyst washing filter 4 through the ceramic filter element. During the water washing process, the first catalyst water washing filter 2, the second catalyst water washing filter 3, and the third catalyst water washing filter 4 need to be backwashed. High-purity water (approximately 50°C) treated by the high-purity water heat exchanger 5 is used for treatment. The high-purity water pipeline is connected to the tube-side inlet of the high-purity water heat exchanger 5. The tube-side outlet of the high-purity water heat exchanger 5 is connected to the side inlet of the first catalyst filter 2, the second catalyst filter 3, and the third catalyst filter 4 through a pipeline. Low-temperature condensate (approximately 130°C) is introduced into the shell-side inlet of the high-purity water heat exchanger 5, and the low-temperature condensate (approximately 120°C) at the shell-side outlet is recycled to the low-temperature condensate pipeline network. When backwashing the first catalyst washing filter 2, the wastewater discharge valve 21 of the first catalyst washing filter is closed, and the high-purity water backwash valve 22 of the first catalyst washing filter is open. When backwashing the second catalyst washing filter 3, the wastewater discharge valve 31 of the second catalyst washing filter is closed, and the high-purity water backwash valve 32 of the second catalyst washing filter is open. When backwashing the third catalyst washing filter 4, the wastewater discharge valve 41 of the third catalyst washing filter is closed, and the high-purity water backwash valve 42 of the third catalyst washing filter is open. The above backwashing process is designed with an automatic program, and manual operation can be performed in case of abnormality.

[0020] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the specific implementation of this utility model and not to limit it. Those skilled in the art should understand that any equivalent substitutions or obvious modifications made to the implementation of this utility model without changing its performance or use, without violating the spirit of this utility model, should be covered within the scope of protection claimed by this utility model.

Claims

1. A hydration catalyst washing filtration system for preventing damage to ceramic filter elements, characterized in that, The system includes a regeneration water washing tank, several catalyst washing filters, and a high-purity water heat exchanger. The outlet of the regeneration water washing tank is connected to the top of the first catalyst washing filter via a pipe. Several catalyst washing filters are connected in series. The bottom outlet of the last catalyst washing filter is connected to the regeneration water washing tank, so that the filtered hydrated catalyst returns to the regeneration water washing tank after exiting from the bottom of the last catalyst washing filter. The tube-side inlet of the high-purity water heat exchanger is connected to a high-purity water pipe, and the tube-side outlet of the high-purity water heat exchanger is connected to the side inlet of each catalyst washing filter via a pipe. The shell-side inlet of the high-purity water heat exchanger is connected to a low-temperature condensate pipe, and the shell-side outlet is connected to a low-temperature condensate network via a pipe.

2. The hydrated catalyst washing filtration system for preventing ceramic filter element damage according to claim 1, characterized in that, The plurality of catalyst water washing filters include a first catalyst water washing filter, a second catalyst water washing filter, and the first, second and third catalyst water washing filters have the same internal structure, consisting of a lotus root-shaped ceramic filter element.

3. The hydrated catalyst washing filtration system for preventing ceramic filter element damage according to claim 1, characterized in that, Each catalyst washing filter has an inlet at the bottom and an outlet at the top, allowing high-purity water to backwash the hydrated catalyst. The outlet is connected to a wastewater pipe, which is equipped with a wastewater discharge valve for the catalyst washing filter.

4. The hydrated catalyst washing filtration system for preventing ceramic filter element damage according to claim 1, characterized in that, The tube outlet of the high-purity water heat exchanger and the pipeline between each catalyst washing filter are equipped with a high-purity water backwash valve.

5. The hydrated catalyst washing filtration system for preventing ceramic filter element damage according to claim 2, characterized in that, The first, second, and third catalyst water washing filters can be automatically backwashed, and can also be manually operated in case of abnormality.

6. The hydrated catalyst washing filtration system for preventing ceramic filter element damage according to claim 1, characterized in that, High-purity water heat exchangers are either tubular or plate heat exchangers.

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