Filtering and recycling system and catalytic reaction process system

Abstract

The utility model relates to a filtration recovery system and a catalytic reaction process system. In one aspect, the filtration and recovery system comprises: a membrane filter comprising a first membrane element and used for receiving a material from a reaction system for catalytic reaction, filtering the material through the first membrane element to obtain a first clear liquid and a first concentrated liquid, and discharging the first concentrated liquid back to the reaction system; and the deactivated catalyst screening device is used for receiving the first concentrated solution, screening out the deactivated catalyst from the first concentrated solution and discharging a second concentrated solution containing the rest of the catalyst back to the reaction system. Therefore, the separated catalyst can be directly recycled, and the overall activity of the catalyst is maintained at a relatively high level.

Description

Technical Field

[0001] The present disclosure relates to the field of separation technology, and in particular, to a filtering recovery system and a catalytic reaction process system. Background Art

[0002] At present, the most widely used and economically effective method for synthesizing BDO (1,4-Butanediol) in industry is the Reppe method using acetylene and formaldehyde as raw materials. In the conventional process route of the Reppe method, acetylene and formaldehyde are first synthesized into BYD (1,4-Butynediol) under the action of a catalyst, and then BYD is hydrogenated at low pressure under the action of a catalyst to obtain a material containing BDO.

[0003] Since BYD low-pressure hydrogenation is carried out in a gas-liquid-solid three-phase slurry bed reactor, the BDO product needs to be separated from hydrogen, catalyst, etc. after the reaction is completed. In the existing separation system, the BDO-containing material is first gravity-sedimented in a sedimentation tank, and then filtered by multiple filtering equipment such as electromagnetic filters, disc filters, bag filters, etc. before it can be transported downstream.

[0004] However, in the existing separation system, the disc filter needs to be pre-coated to improve the filtration accuracy, which makes the separated catalyst cannot be directly recycled. Moreover, even if the separated catalyst can be recycled, its activity will decay due to recycling, thus affecting the catalytic effect. Utility Model Content

[0005] This section provides a general summary of the disclosure, and is not a comprehensive disclosure of its full scope or all of its features.

[0006] One object of the present disclosure is to provide a filtration recovery system and a catalytic reaction process system that enable the separated catalyst to be directly recycled.

[0007] Another object of the present disclosure is to provide a filtration recovery system and a catalytic reaction process system capable of maintaining the overall activity of the catalyst at a high level.

[0008] In order to achieve the above object, according to one aspect of the present disclosure, a filtration recovery system is provided for filtering and recovering a solid catalyst in a catalytic reaction process, comprising:

[0009] A membrane filter comprising a first membrane element, and the membrane filter is used to receive a material from a reaction system for catalytic reaction, filter the material through the first membrane element to obtain a first clear liquid and a first concentrated liquid, and discharge the first concentrated liquid back to the reaction system; and

[0010] The deactivated catalyst screening device is used to receive the first concentrated solution, screen out the deactivated catalyst from the first concentrated solution, and discharge the second concentrated solution containing the remaining catalyst back to the reaction system.

[0011] In some embodiments, the filtration recovery system may include a plurality of membrane filters connected in parallel.

[0012] In some embodiments, the deactivated catalyst screening device may include:

[0013] a catalyst screening tank, for receiving the first concentrated solution, screening the catalyst in the first concentrated solution to obtain a second clear solution and a second concentrated solution, and discharging the second clear solution and the second concentrated solution respectively, and discharging the second concentrated solution back to the reaction system; and

[0014] The spent catalyst separation device is used for receiving the second clear liquid and separating the deactivated catalyst from the second clear liquid to obtain a third clear liquid and a third concentrated liquid including the deactivated catalyst.

[0015] In some embodiments, the deactivated catalyst screening device may further include a sedimentation tank for receiving the third concentrated liquid discharged from the spent catalyst separation device.

[0016] In some embodiments, the catalyst screening tank may include a tank body, an agitator and a sieve plate, wherein the agitator is used to agitate the first concentrate in the tank body, and the sieve plate is disposed at the inner circumferential wall of the tank body to screen the catalyst in the agitated first concentrate.

[0017] In some embodiments, the catalyst screening tank may include a plurality of sieve plates distributed in the axial direction of the catalyst screening tank, and the corresponding plurality of lengths of the plurality of sieve plates in the radial direction of the catalyst screening tank gradually lengthen upward along the axial direction.

[0018] In some embodiments, the sieve plate may be provided with apertures therethrough, and the sieve plate may be annular or arcuate when viewed in the axial direction of the catalyst screening tank.

[0019] In some embodiments, the catalyst screening tank may further include an overflow weir plate, wherein the overflow weir plate is disposed on the top of the tank body, and the overflow weir plate includes an overflow trough to discharge the second clear liquid through the overflow trough.

[0020] In some embodiments, the filtration recovery system may further include a control device and a regeneration device, wherein the control device is configured to control the regeneration device to clean the first membrane element when the pressure difference between the upstream and downstream of the first membrane element reaches a set value.

[0021] According to another aspect of the present disclosure, a catalytic reaction process system is also provided, comprising:

[0022] a reaction system for carrying out a catalytic reaction therein; and

[0023] A filtration recovery system according to any of the above embodiments.

[0024] According to the above technical solution, by using a membrane filter, the catalyst particles in the material can be protected from contamination, which facilitates the direct recycling of the catalyst. In addition, by setting up a deactivated catalyst screening device to screen and remove the catalyst solid particles with low activity in the system, the overall activity of the catalyst in the reaction system can be maintained at a high level, thereby improving the reaction conversion rate and product yield, and improving the long-term operation stability of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The features and advantages of the embodiments of the present disclosure will become more easily understood through the following description with reference to the accompanying drawings. The drawings are not drawn to scale and some features may be enlarged or reduced to show details of specific components. In the drawings:

[0026] Figure 1 is a schematic diagram of a filtration recovery system according to an embodiment of the present disclosure.

[0027] Figure 2 is a schematic diagram of a filtration recovery system according to another embodiment of the present disclosure.

[0028] Figure 3 It is a schematic structural diagram of a catalyst screening tank according to an embodiment of the present disclosure.

[0029] Figure 4 It is a schematic structural diagram of a catalyst screening tank according to another embodiment of the present disclosure.

[0030] Figure 5 The structure of a sieve plate according to an embodiment of the present disclosure is schematically shown in a top view.

[0031] Figure 6 The structure of a sieve plate according to another embodiment of the present disclosure is schematically shown in a top view.

[0032] Figure 7 It is a schematic diagram of a filtration recovery system according to yet another embodiment of the present disclosure.

[0033] In the drawings, the same or corresponding technical features or components are represented by the same or corresponding reference numerals. DETAILED DESCRIPTION

[0034] The present disclosure is described in detail below with reference to the accompanying drawings by means of exemplary embodiments. It should be noted that the following detailed description of the present disclosure is only for illustrative purposes and is by no means a limitation of the present disclosure.

[0035] Unless otherwise defined, the technical or scientific terms used in this disclosure shall have the common meanings understood by those skilled in the art to which this disclosure belongs. The words "first", "second", "third" and the like used in this disclosure do not indicate any order or importance, but are only used to distinguish similar components or objects.

[0036] As mentioned above, in the low-pressure hydrogenation reaction process for synthesizing BDO, conventionally, the catalyst in the synthesized BDO-containing material is filtered in sequence through multiple filtering devices such as electromagnetic filters, disc filters, bag filters, etc. However, in the existing separation system, the disc filter needs to be pre-coated to improve the filtering accuracy, so that the separated catalyst cannot be directly recycled. Moreover, even if the separated catalyst can be recycled, its activity will decay due to recycling, thereby affecting the catalytic effect.

[0037] In order to solve the above problems, the present disclosure provides a filtration recovery system. It should be noted that the filtration recovery system can be used not only for the filtration recovery of the solid catalyst in the low-pressure hydrogenation reaction process for synthesizing BDO, but also for the filtration recovery of the solid catalyst in any other low-pressure hydrogenation reaction process. Further, the filtration recovery system can also be more widely used for the filtration recovery of the solid catalyst in the catalytic reaction process. Here, the catalytic reaction process refers to a process that uses a catalyst to accelerate the reaction, wherein the filtration recovery of the catalyst is involved. For example, the catalytic reaction process can be a hydrogenation reaction process, an oxidation reaction process, a cracking reaction process, a polymerization reaction process, a desulfurization reaction process, etc.

[0038] Below, refer to Figure 1 , the filtering recovery system 1 according to an embodiment of the present disclosure is described in detail.

[0039] The filtration recovery system 1 includes a membrane filter 10 and a deactivated catalyst screening device 11 .

[0040] The membrane filter 10 includes a first membrane element 100 , and is used to receive material from a reaction system 2 for catalytic reaction, filter the material through the first membrane element 100 to obtain a first clear liquid and a first concentrated liquid, and discharge the first concentrated liquid back to the reaction system 2 .

[0041] like Figure 1As shown in , the membrane filter 10 is connected between the liquid outlet pipeline 201 and the liquid inlet pipeline 202 of the reaction system 2. Specifically, the feed port 10a (hereinafter referred to as the first feed port 10a) of the membrane filter 10 is connected to the liquid outlet pipeline 201, and the discharge port 10b (hereinafter referred to as the first concentrated liquid discharge port 10b) is connected to the liquid inlet pipeline 202. Moreover, the discharge port 10c (hereinafter referred to as the first clear liquid discharge port 10c) of the membrane filter 10 is connected to the clear liquid discharge pipeline 301, so that the first clear liquid enters the subsequent process section, for example, enters the clear liquid collection device 3.

[0042] The first feed port 10a is used to receive materials from the reaction system 2. After the materials are filtered by the membrane filter 10, a clear liquid and a concentrated liquid are obtained, namely, the so-called first clear liquid and the first concentrated liquid. The first clear liquid discharge port 10c is used to discharge the first clear liquid. The first concentrated liquid discharge port 10b is used to discharge the first concentrated liquid, and the first concentrated liquid discharge port 10b discharges the first concentrated liquid back to the liquid inlet pipeline 202 of the reaction system 2.

[0043] It should be understood that the clear liquid is a relatively clear fluid obtained after filtering the catalyst, while the concentrated liquid is a fluid containing the catalyst that is filtered and deposited. Therefore, even if there is catalyst in the clear liquid, its content is relatively low and the particle size of the catalyst therein is relatively small, while the catalyst content in the concentrated liquid is relatively high and the particle size of the catalyst therein is relatively large.

[0044] Thus, the material from the liquid outlet pipeline 201 of the reaction system 2 can be transported to the membrane filter 10. After being filtered in the membrane filter 10, the first concentrated liquid discharged from the membrane filter 10 returns to the liquid inlet pipeline 202 of the reaction system 2 to continue to participate in the reaction in the reaction system 2, thereby realizing the recovery and reuse of the catalyst.

[0045] By using the membrane filter 10, the solid catalyst particles in the material can be intercepted by the first membrane element 100 and deposited at the bottom of the membrane filter 10, and will not be contaminated during the whole process. Therefore, a high filtering accuracy is ensured, and the catalyst will not be contaminated as in the previously mentioned pre-coating method, and therefore when the solid catalyst particles are recycled into the reaction system 2 for reuse, it can avoid undesirable effects on the catalytic reaction, thereby realizing the direct recycling of the separated catalyst.

[0046] The deactivated catalyst screening device 11 is used to receive the first concentrated solution, screen out the deactivated catalyst from the first concentrated solution, and discharge the second concentrated solution including the remaining catalyst back to the reaction system 2 .

[0047] Since the activity of the catalyst will decay after recycling, thus affecting the catalytic effect, a deactivated catalyst screening device 11 is provided to screen the catalyst solid particles in the first concentrated solution discharged from the membrane filter 10 for recycling, and separate the catalyst solid particles with decreased activity. In this way, the overall activity of the catalyst in the reaction system 2 can be maintained at a high level, thereby improving the reaction conversion rate and product yield, and improving the long-term operation stability of the system.

[0048] It is conceivable that the catalyst deposited at the lower portion of the membrane filter 10 can be discharged into the deactivated catalyst screening device 11 at a certain period. For example, a shutoff bypass connected to the feed port of the deactivated catalyst screening device 11 is provided on the liquid inlet pipeline 202 of the reaction system 2 to regularly screen and separate the deactivated catalyst from the first concentrated liquid.

[0049] It is conceivable that the membrane filter 10 may be a tubular membrane filter. The material of the first membrane element 100 of the membrane filter 10 may be, but is not limited to, one of ceramics, mogan stone, stainless steel, alloy, or a combination of two thereof.

[0050] It is conceivable that the filter recovery system 1 may include only one membrane filter 10. However, the filter recovery system 1 may also include a plurality of membrane filters 10, for example a number between two and ten.

[0051] In some embodiments, Figure 1 As shown in FIG. 1 , the filtration recovery system 1 may include a plurality of membrane filters 10 , which are connected in parallel.

[0052] In this case, each membrane filter 10 is capable of receiving a material from a reaction system 2 for a catalytic reaction. Figure 1 exemplarily shows that the filtration recovery system 1 includes three membrane filters 10. Each membrane filter 10 is connected between the liquid outlet pipeline 201 and the liquid inlet pipeline 202, that is, the first feed port 10a of each membrane filter 10 is connected to the liquid outlet pipeline 201, the first concentrated liquid outlet 10b is connected to the liquid inlet pipeline 202, and the first clear liquid outlet 10c is connected to the clear liquid outlet pipeline 301.

[0053] Thus, the material from the liquid outlet pipeline 201 of the reaction system 2 can be diverted and transported to the three membrane filters 10. After being filtered in each membrane filter 10, the first concentrated liquid discharged from these membrane filters 10 is merged and returned to the liquid inlet pipeline 202 of the reaction system 2.

[0054] By connecting multiple membrane filters in parallel, the material from the reaction system 2 can be diverted, so that each membrane filter can work independently of other membrane filters, and the filtration processing capacity of each membrane filter is only a part of the total amount to be processed, that is, the filtration processing capacity of a single filtration device is reduced. In this way, the mutual restraint between the membrane filters is avoided, and each membrane filter can work with a smaller load, thereby improving the overall filtration recovery efficiency, and further reducing the system energy consumption and operating costs.

[0055] Moreover, the independence of each membrane filter and the reduction of load also reduce the risk of clogging of the membrane filter, thereby improving the operational stability of the filtration recovery system and extending the operating cycle. In addition, the independence of each membrane filter allows the selective operation of some or all of these membrane filters, thereby improving the operational adaptability of the filtration recovery system, so that, for example, when the system load changes or under abnormal operating conditions, the filtration recovery system can also perform filtering work normally.

[0056] In some embodiments, Figure 1 As shown in , the deactivated catalyst screening device 11 may include a catalyst screening tank 110 and a spent catalyst separation device 111 .

[0057] The catalyst screening tank 110 is used to receive the first concentrated solution, screen the catalyst in the first concentrated solution to obtain a second clear solution and a second concentrated solution, and discharge the second clear solution and the second concentrated solution respectively, and discharge the second concentrated solution back to the reaction system 2 .

[0058] Specifically, the catalyst screening tank 110 may include a second feed port 110a, a second concentrated solution discharge port 110b, and a second clear solution discharge port 110c. The second feed port 110a may be connected to the liquid inlet pipeline 202 to receive the first concentrated solution. The catalyst screening tank 110 screens the catalyst solid particles of the first concentrated solution to obtain a second clear solution and a second concentrated solution. The second clear solution discharge port 110c is used to discharge the second clear solution and discharge the second clear solution to the waste catalyst separation device 111. The second concentrated solution discharge port 110b may be connected to the liquid inlet pipeline 202 to discharge the second concentrated solution and discharge the second concentrated solution back to the reaction system 2.

[0059] The spent catalyst separation device 111 is used to receive the second clear liquid discharged from the catalyst screening tank 110, and separate the deactivated catalyst from the second clear liquid to obtain a third clear liquid and a third concentrated liquid including the deactivated catalyst.

[0060] Specifically, the waste catalyst separation device 111 may include a third feed port 111a, a third concentrated liquid discharge port 111b, and a third clear liquid discharge port 111c. The third feed port 111a may be connected to the second clear liquid discharge port 110c of the catalyst screening tank 110 to receive the second clear liquid. After the waste catalyst separation device 111 separates the deactivated catalyst from the second clear liquid, a third clear liquid and a third concentrated liquid are obtained, that is, the separated deactivated catalyst finally forms a third concentrated liquid. The third clear liquid discharge port 111c may be connected to the clear liquid discharge pipeline 301 to discharge the third clear liquid so as to enter a subsequent process section, for example, to enter the clear liquid collection device 3. The third concentrated liquid discharge port 111b is used to discharge the third concentrated liquid so as to subsequently treat the deactivated catalyst.

[0061] Thus, while the deactivated catalyst is screened and separated from the material, the catalyst that has not yet been deactivated can be returned to the liquid inlet pipeline 202 of the reaction system 2 along with the second concentrated liquid to continue to participate in the reaction in the reaction system 2, thereby realizing the recovery and reuse of the catalyst. In this way, the screening and separation of the deactivated catalyst can be implemented more effectively and accurately, avoiding the decrease in the reaction conversion rate and product yield due to uneven catalyst activity, while also reducing the frequency of replenishing fresh catalyst and reducing the operating cost.

[0062] Here, it should be noted that the attenuation of catalyst activity is usually accompanied by the crushing and refinement of catalyst solid particles. After continuous recycling, the activity of the catalyst will decay. Therefore, the particle size of the catalyst solid particles can be physically screened to finally separate the catalyst solid particles whose activity does not meet the expectations or is inactivated. Therefore, after screening by the catalyst screening tank 110, the more active catalyst solid particles are deposited at the bottom of the catalyst screening tank 110 due to gravity sedimentation to be recycled, while the less active or inactivated catalyst solid particles are entrained with the liquid into the waste catalyst separation device 111, and after separation by the waste catalyst separation device 111, they are deposited at the bottom of the waste catalyst separation device 111 to be discharged.

[0063] It is conceivable that the catalyst screening tank 110 can recycle catalyst solid particles with a particle size greater than 5 μm, while catalyst solid particles with a particle size less than 5 μm are transported to the waste catalyst separation device 111 with the second clear liquid to be separated by the waste catalyst separation device 111 and treated as waste catalyst.

[0064] In some embodiments, the spent catalyst separation device 111 may include a second membrane element 1110 for filtering the catalyst.

[0065] The second membrane element 1110 can intercept catalyst solid particles of a specific particle size (eg, catalyst solid particles with a particle size less than 5 μm) on its outer surface, so that these catalyst solid particles are deposited at the bottom of the waste catalyst separation device 111 due to their own gravity and are eventually discharged.

[0066] It is conceivable that the material of the second membrane element 1110 may be, but is not limited to, one of ceramics, mogan stone, stainless steel, alloy, or a combination of two thereof.

[0067] In some embodiments, reference Figure 2 The deactivated catalyst screening device 11 may further include a sedimentation tank 112 for receiving the third concentrated liquid discharged from the spent catalyst separation device 111 .

[0068] The sedimentation tank 112 may include a fourth feed port 112a and a fourth discharge port 112b. The fourth feed port 112a is connected to the third concentrated solution discharge port 111b of the waste catalyst separation device 111 to receive the third concentrated solution for subsequent treatment. For example, after the concentration of catalyst particles in the third concentrated solution in the sedimentation tank 112 increases to a certain extent, the catalyst can be discharged from the sedimentation tank 112 through the fourth discharge port 112b.

[0069] It is conceivable that, without providing the sedimentation tank 112 , the catalyst can be discharged through the third concentrated solution discharge port 111 b after the concentration of catalyst particles in the third concentrated solution in the waste catalyst separation device 111 reaches a certain level.

[0070] Below, refer to Figures 3 to 6 , the catalyst screening tank 110 according to an embodiment of the present disclosure is described in detail.

[0071] In some embodiments, Figure 3 As shown in , the catalyst screening tank 110 may include a tank body 1100, an agitator 1101 and a sieve plate 1102. The agitator 1101 is used to agitate the first concentrated solution in the tank body 1100, and the sieve plate 1102 is arranged at the inner circumferential wall 1100a of the tank body 1100 to screen the catalyst in the agitated first concentrated solution.

[0072] By providing the stirrer 1101 to stir the first concentrated liquid, the first concentrated liquid can be made to swirl in the entire tank 1100, so that the catalyst solid particles that originally settled and accumulated at the bottom of the tank 1100 can be dispersed. Thus, on the one hand, it can prevent the accumulation of solid particles from blocking the bottom of the tank 1100 and affecting the drainage; on the other hand, it can make the small-sized solid particles not blocked by the large-sized solid particles and can easily float up.

[0073] Furthermore, by providing the sieve plate 1102 at the inner peripheral wall 1100a of the tank body 1100, a small vortex can be formed in the first concentrated solution below the sieve plate 1102. Thus, when the catalyst solid particles floating from the bottom of the tank body 1100 under the stirring action of the stirrer 1101 move to the bottom of the sieve plate 1102, the large particles among these catalyst solid particles can collide with the sieve plate 1102 and thus be blocked by the sieve plate 1102. The blocked large particles will return to the bottom of the tank body 1100 under the action of gravity, while the small particles will float over the sieve plate 1102 and be discharged with the second clear liquid mainly due to free diffusion. Thus, effective screening of the catalyst in the first concentrated solution is achieved.

[0074] In other words, the catalyst solid particles with small particle size settled at the bottom of the tank body 1100 are first separated from the constraints of the catalyst solid particles with large particle size by the larger vortex brought by stirring and spread out, and move to the vicinity of the inner peripheral wall 1100a of the tank body 1100, and then the catalyst solid particles with large particle size collide with the bottom of the sieve plate 1102 to be blocked by the smaller vortex below the sieve plate 1102 arranged at the inner peripheral wall 1100a, and return to the bottom of the tank body 1100 under the action of gravity. For the catalyst solid particles with small particle size, they will float up and be discharged under the action of free diffusion. Therefore, it can be understood that the screening is achieved by the joint action of the agitator 1101 and the sieve plate 1102, and the effectiveness of the screening is improved by the joint action of the two.

[0075] In some embodiments, Figure 4 As shown in , the catalyst screening tank 110 may include a plurality of sieve plates 1102, for example, 2 to 10 sieve plates, and the plurality of sieve plates 1102 are distributed in the axial direction of the catalyst screening tank 110, and the corresponding plurality of lengths of the plurality of sieve plates 1102 in the radial direction of the catalyst screening tank 110 gradually lengthen upward along the axial direction.

[0076] By providing multiple or multiple layers of sieve plates 1102 and gradually lengthening the lengths of these sieve plates 1102 as described above, small vortices can be formed under each sieve plate 1102, and the probability that large-sized catalyst solid particles scattered throughout the tank body 1100 are under the sieve plate 1102 is increased, thereby increasing the probability that large-sized catalyst solid particles collide with the sieve plate 1102, thereby improving the screening effect on large-sized catalyst solid particles as a whole.

[0077] It is contemplated that the screen plate 1102 may be provided with apertures therethrough. For example, the screen plate 1102 may be in the form of a grid, such as a metal grid.

[0078] By providing the pores, the sieve plate 1102 can still block particles with larger particle sizes, while the pores of the sieve plate 1102 can allow lighter particles with smaller particle sizes to float through, thereby improving the screening effect. In addition, the provision of the pores can also prevent the formation of gaps or large fluid fluctuations at the junction of the sieve plate 1102 and the inner peripheral wall 1100a of the tank body 1100 due to the blocking of the sieve plate 1102.

[0079] In some embodiments, Figure 5 and Figure 6 As shown in FIG. 1 , the sieve plate 1102 may be annular or arcuate when viewed along the axial direction of the catalyst screening tank 110 .

[0080] Alternatively, it is conceivable that, when a plurality of sieve plates 1102 are provided, a portion of the sieve plates 1102 may be annular in shape, while another portion of the sieve plates 1102 may be arcuate in shape.

[0081] The ring or arcuate shape can leave a sufficiently large flow path for the fluid in the center of the screen plate, which helps to ensure normal screening.

[0082] In some embodiments, Figure 3 and Figure 4 As shown in , the agitator 1101 may include a blade 1101a. It is contemplated that the blade 1101a may be fan-shaped, flat-plate-shaped, etc. In addition, the blade 1101a may be one or more layers.

[0083] It is conceivable that the blades 1101a of the agitator 1101 may be disposed at the lower middle portion of the tank body 1100, and the rotation speed of the agitator 1101 may be between 5 r / min and 60 r / min.

[0084] In some embodiments, Figure 3 and Figure 4 As shown in , the catalyst screening tank 110 may further include an overflow weir plate 1103, which is disposed on the top of the tank body 1100 and includes an overflow trough 1103a to discharge the second clear liquid through the overflow trough 1103a.

[0085] As mentioned above, the catalyst solid particles with small particle size screened by the sieve plate 1102 will float up and be discharged from the tank body 1100 along with the liquid. By setting the overflow weir plate 1103 on the top of the tank body 1100, the liquid containing the catalyst solid particles with small particle size will overflow and be discharged from the catalyst screening tank 110 through the overflow groove 1103a, thereby, the catalyst solid particles with small particle size will be further screened under the action of the overflow groove 1103a.

[0086] In some embodiments, reference Figure 1 , Figure 2and Figure 7 The filtration recovery system 1 may further include a control device 12 and a regeneration device 13. The control device 12 is configured to control the regeneration device 13 to clean the first membrane element 100 when the pressure difference between the upstream and downstream of the first membrane element 100 reaches a set value.

[0087] For example, Figure 1 , Figure 2 and Figure 7 As shown in , the regeneration device 13 may include a plurality of cleaning devices 130, which correspond one to one with the membrane filter 10, that is, each cleaning device 130 is used for automatic cleaning of its corresponding membrane filter 10. The control device 12 may be configured to start the regeneration device 13 when the pressure difference between the upstream and downstream of the first membrane element 100 increases to a set value. The pressure difference between the upstream and downstream of the first membrane element 100 can be detected using a differential pressure gauge. However, it is also conceivable that the control device 12 may also start the regeneration device 13 to clean the first membrane element 100 according to actual needs.

[0088] In this way, there is no need for manual disassembly, cleaning or replacement of membrane elements, which improves the self-control of the regeneration and cleaning of the filtration recovery system, helps to reduce the maintenance cost of the membrane filter, extend the service life of the membrane filter and the operation cycle of the entire filtration recovery system, thereby further improving the operating stability of the filtration recovery system.

[0089] It is conceivable that, in the case where the waste catalyst separation device 111 includes the second membrane element 1110, the control device 12 can also be configured to control the regeneration device 13 to clean the second membrane element 1110 when the pressure difference between the upstream and downstream of the second membrane element 1110 reaches a set value. Similarly, it is conceivable that the control device 12 can also start the regeneration device 13 to clean the second membrane element 1110 according to actual needs.

[0090] Exemplarily, the control device 12 may be a central control system for the filtration recovery system 1. The central control system may be used to monitor the operating status of the entire filtration recovery system 1 in real time, such as parameters such as the flow rate and pressure of the material, and may be used to control the start, stop and adjustment of each device in the filtration recovery system 1.

[0091] In some embodiments, the automatic cleaning may be power wave cleaning. In this case, the cleaning device may be a power wave cleaning device, such as a high-frequency power wave cleaning device. The automatic cleaning process of the membrane filter 10 may include the following steps: replacing the fluid in the membrane filter 10 with a special cleaning liquid for automatic cleaning; then, vibrating and cleaning the first membrane element 100 using a power wave cleaning device; and then, draining the liquid in the membrane filter 10 to complete the cleaning. It is conceivable that the original fluid in the membrane filter 10 may also be used for direct cleaning. In this case, the cleaning can be completed by simply discharging the concentrated liquid containing impurities after cleaning.

[0092] In addition, the automatic cleaning can also be gas backwash cleaning. Specifically, when the pressure difference reaches the set threshold, the fluid in the membrane filter 10 is first discharged, and then the Figure 7 The gas source 4 shown in the figure uses an inert gas such as nitrogen or argon to backflush the first membrane element 100 to loosen and remove the catalyst attached to the first membrane element 100. It is conceivable that the fluid in the membrane filter 10 can be directly backflushed with liquid for bubbling cleaning without discharging the fluid.

[0093] In addition, the automatic cleaning can also be liquid backwash cleaning. The liquid used for backwash cleaning can be water, such as desalted water, which can come directly from the water source 5 in the factory, such as Figure 1 , Figure 2 and Figure 7 The liquid used for backwash cleaning can also be other liquids that will not introduce pollution to the system, for example, the clear liquid obtained from the filtration recovery system.

[0094] The above-mentioned automatic cleaning methods can simplify the regeneration and cleaning process, eliminating the need for manual disassembly and assembly, replacement of parts, etc., thereby saving labor costs and reducing the maintenance cost of the entire filtration recovery system.

[0095] In some embodiments, Figure 7 As shown in FIG. 1 , the regeneration device 13 may include a regeneration liquid tank 131 , and the regeneration liquid tank 131 is used to store and provide liquid for performing the above-mentioned cleaning.

[0096] exist Figure 7 In the embodiment, the liquid outlet 1310 of the regeneration liquid tank 131 provides liquid to the liquid inlet 10d of each membrane filter 10 for automatic cleaning of the first membrane element 100. The liquid that has entered the membrane filter 10 and completed the automatic cleaning can flow back to the regeneration liquid tank 131 to be circulated as a flushing liquid, for example, while the bottom dirty liquid is no longer used and is directly discharged from the drain port 1311.

[0097] In addition, it is conceivable that when the waste catalyst separation device 111 includes the second membrane element 1110 , the regeneration liquid tank 131 can also provide liquid to the catalyst screening tank 110 so that the liquid is transported to the waste catalyst separation device 111 for automatic cleaning of the second membrane element 1110 .

[0098] It is understandable that a plurality of membrane filters 10 can be partially automatically cleaned, for example, can be automatically cleaned in turn. In this way, the membrane filter 10 that is not automatically cleaned is in normal filtering mode, thus maintaining the continuous and stable operation of the filtering recovery system.

[0099] In some embodiments, Figure 1 , Figure 2 and Figure 7 As shown in FIG. 1 , the reaction system 2 includes a reactor 20, and the material undergoes a catalytic reaction, for example, a low-pressure hydrogenation reaction, inside the reactor 20. The reacted material is transported to the membrane filter 10 via a liquid outlet pipeline 201 for filtration, and the first concentrated solution obtained by filtration and the second concentrated solution obtained by screening are transported back to the reactor 20 via a liquid inlet pipeline 202 for reuse.

[0100] In some embodiments, Figure 1 , Figure 2 and Figure 7 As shown in , the reaction system 2 may further include a catalyst storage tank 21. The catalyst storage tank 21 is used to receive and store the concentrated solution transported back via the liquid inlet pipeline 202, and to transport the concentrated solution containing the catalyst to the reactor 20.

[0101] In this way, the concentrated solution can be collected and stored in advance and transported to the reactor 2 when appropriate, thereby avoiding the reaction fluctuations that may be caused by the concentrated solution directly flowing back to the reactor 2, which is beneficial to maintaining the stability of the reaction process.

[0102] In some embodiments, Figure 1 , Figure 2 and Figure 7 As shown in , the reaction system 2 may further include a settling tank 22. The settling tank 22 is used to receive the discharge of the reactor 20, so that the catalyst solid particles in the material entering the settling tank 22 are separated by gravity settling to obtain a primary clear liquid and a primary concentrated liquid, and the primary clear liquid is discharged to the liquid outlet pipeline 201 so as to enter the membrane filter 10 for filtration, and the primary concentrated liquid is discharged to the catalyst storage tank 21, or it can also be directly discharged to the reactor 20 for recycling.

[0103] In this way, the processing load of the membrane filter 10 can be reduced, the filtering difficulty and the risk of clogging can be reduced, and the service life of the membrane filter 10 can be extended.

[0104] According to another aspect of the present disclosure, a catalytic reaction process system is also provided, comprising:

[0105] A reaction system 2 for carrying out a catalytic reaction therein; and

[0106] Filtration recovery system1.

[0107] It is understandable that the filtration recovery system 1 and / or the catalytic reaction process system can be equipped with power equipment, instruments, valves or other necessary pipelines at required locations according to the working conditions, which will not be elaborated herein.

[0108] Although the present disclosure has been described with reference to exemplary embodiments, it should be understood that the present disclosure is not limited to the specific embodiments described and shown in detail herein. Various changes may be made to the exemplary embodiments by those skilled in the art without departing from the scope defined by the claims of the present disclosure.

[0109] The features mentioned and / or shown in the above description of the exemplary embodiments of the present disclosure may be combined in the same or similar manner into one or more other embodiments, combined with features in other embodiments or substituted for corresponding features in other embodiments. The technical solutions obtained by these combinations or substitutions shall also be deemed to be included in the protection scope of the present disclosure. Therefore, the protection scope of the present disclosure shall be subject to the protection scope of the claims.

Claims

1. A filtration recovery system for filtering and recovering solid catalysts in a catalytic reaction process, characterized in that: include: A membrane filter, comprising a first membrane element, and the membrane filter is used to receive a material from a reaction system for catalytic reaction, filter the material through the first membrane element to obtain a first clear liquid and a first concentrated liquid, and discharge the first concentrated liquid back to the reaction system; as well as The deactivated catalyst screening device is used to receive the first concentrated solution, screen out the deactivated catalyst from the first concentrated solution, and discharge the second concentrated solution including the remaining catalyst back to the reaction system.

2. The filtration recovery system according to claim 1, characterized in that: The invention comprises a plurality of membrane filters, wherein the plurality of membrane filters are connected in parallel.

3. The filtration recovery system according to claim 1 or 2, characterized in that: The deactivated catalyst screening device comprises: a catalyst screening tank, used for receiving the first concentrated solution, screening the catalyst in the first concentrated solution to obtain a second clear solution and the second concentrated solution, and discharging the second clear solution and the second concentrated solution respectively, and discharging the second concentrated solution back to the reaction system; and The spent catalyst separation device is used for receiving the second clear liquid and separating the deactivated catalyst from the second clear liquid to obtain a third clear liquid and a third concentrated liquid including the deactivated catalyst.

4. The filtration recovery system according to claim 3, characterized in that: The deactivated catalyst screening device further includes a sedimentation tank for receiving the third concentrated liquid discharged from the spent catalyst separation device.

5. The filtration recovery system according to claim 3, characterized in that: The catalyst screening tank comprises a tank body, an agitator and a sieve plate. The agitator is used to agitate the first concentrated solution in the tank body. The sieve plate is arranged at the inner circumferential wall of the tank body to screen the catalyst in the agitated first concentrated solution.

6. The filtration recovery system according to claim 5, characterized in that: The catalyst screening tank comprises a plurality of sieve plates, which are distributed in the axial direction of the catalyst screening tank, and the corresponding lengths of the plurality of sieve plates in the radial direction of the catalyst screening tank gradually become longer upward along the axial direction.

7. The filtration recovery system according to claim 5, characterized in that: The sieve plate is provided with pores therethrough, and the sieve plate is annular or arcuate when viewed in the axial direction of the catalyst screening tank.

8. The filtration recovery system according to claim 5, characterized in that: The catalyst screening tank further includes an overflow weir plate, which is disposed on the top of the tank body and includes an overflow trough to discharge the second clear liquid through the overflow trough.

9. The filtration recovery system according to claim 1, characterized in that: The system further comprises a control device and a regeneration device, wherein the control device is configured to control the regeneration device to clean the first membrane element when the pressure difference between the upstream and downstream of the first membrane element reaches a set value.

10. A catalytic reaction process system, characterized in that: include: a reaction system for carrying out a catalytic reaction therein; as well as A filtration recovery system according to any one of claims 1 to 9.

Images